Laboratory  Apparatus 

FOR 

CHEMICAL,  INDUSTRIAL,  BACTERIOLOGICAL/ 
BIOLOGICAL,  BOARD  OF  HEALTH  ANE):-  .-;: 
SOIL  TESTING  LABORATORIES 


MADE      IN      AMERICA 


CATALOG  C 

No.  218 


A.  H.  McCONNELL,  President 

Established  H.  C.  ARMS,  Vice-President  Incorporated 

1889  J.  M.  ROBERTS.  Secretary  1900 


MANUFACTURED  AND  SOLD  BY 

CENTRAL  SCIENTIFIC  CO. 

it 

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(Lake  Shore  Drive,  Ohio  and  Ontario  Streets) 

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CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


The  Central  Corridor  of  Our  Spacious  and  Well  Lighted  Offices. 


A  Corner  of  Our  Display  Room. 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Looking  Down  the  Central  Aisle  of  Our  Instrument  Shop. 


Our  Heavy  Duty  Machinery  Eoom. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Our  Chemical  Stock  and  Packing  Room. 


One  Corner  of  Our  Glass  Shop,  which  Includes  in  Addition  to  the  Lamp  Boom  (shown 
here)  a  Graduating  and  Grinding  Boom,  an  Acid  Room,  an  Annealing  Furnace,  a  Stock 
and  Preparation  Room  and  a  Business  Office. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


A  View  of  Our  Shipping  Boom. 


One  Section  of  Stock  Bins  Showing  How  Goods  are  Stored  When  Taken  Out  of  the 
Original  Cases.  Over  40,000  Square  Feet  of  Floor  Space  are  Occupied  by  Our  Stock  of 
Scientific  Apparatus. 


One  Section  of  Our  Eeserve  Stock. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


TO  OUR  CUSTOMERS 

In  bringing  out  this  war  edition  of  our  Chemical,  Industrial  and  Bacteriological  Catalog  we  wish 
to  call  the  attention  of  those  into  whose  hands  it  comes  to  certain  features  which  we  believe  are  worthy 
of  careful  attention.  AMERICAN  MACE  APPARATUS. 

We  have  eliminated  from  this  catalog  all  apparatus  which  was  formerly  imported  and  has  not  been 
duplicated  up  to  this  time  in  this  country.  This  is  the  first  and  only  truly  American  catalog  of  chemical 
laboratory  supplies  published  which  pretends  to  be  at  all  complete.  The  only  important  item  of  foreign 
manufacture  listed  is  Whatman  English  Filter  Paper,  a  line  which  baa  won  the  support  of  all  chemists, 
and  for  which  no  American  substitute  has  as  yet  been  introduced. 

UP-TO-DATE  APPARATUS. 

We  have  selected  only  up-to-date  types  of  apparatus,  leaving  out  any  forms  which  appear  from  our 
experience  to  be  classical  relies.  PROMPT  DELIVERIES. 

We  have  Included  only  apparatus  which  we  know  is  being  manufactured  at  this  time,  and  can  be 
delivered  within  a  reasonable  length  of  time.  We  can  not,  of  course,  predict  the  effect  which  the  de- 
mands of  the  war  may  have  upon  the  discontinuance  of  any  manufactured  articles,  nor  the  effect  of 
the  demands  of  Government  laboratories  upon  the  adequacy  of  the  supply.  We  are  endeavoring  to  keep 
a  large  stock  and  every  square  foot  of  available  space  in  the  2^4  acres  of  our  6  story  building  is  packed 
to  the  roof  with  reserve  stock.  GLASSWARE  AND  PORCELAIN. 

Our  stocks  of  glassware  and  porcelain  have  beeu  selected  from  the  American  market  after  3M>  years 
of  careful  observation,  experiment  and  comparison  of  data  from  various  sources.  We  believe  them  to  be 
the  best  adapted  to  the  needs  of  American  laboratories.  We  propose  to  change  brands  only  after  we 
have  been  convinced  that  such  a  change  best  serves  the  needs  of  the  chemical  trade. 

PRICES. 

The  prices  in  this  catalog  were  current  at  the  time  of  publication.  Owing  to  the  rapid  changes  in 
the  cost  of  raw  materials  and  of  labor,  we  cannot  guarantee  prices  to  remain  constant  for  any  length  of 
time.  We  shall  be  glad  to  fill  orders  at  prices  current  at  the  time  of  their  receipt.  If  necessary  to  have 
the  exact  cost  of  materials,  we  urge  our  customers  to  send  in  their  lists  for  quotation. 

ORDERS  AND  LISTS  FOR  QUOTATION. 

1.  When  possible,  specify  our  catalog  number,  name  of  article  and  dimensions.     Further  specifica- 
tion is  not  necessary.      We  furnish  conveniently  ruled  order  sheets  upon  request. 

Note:  Lists  made  from  catalogs  of  other  dealers  will  be  transposed  by  us  into  our  own  numbers 
when  possible,  with  our  guarantee  that  the  articles  will  equal  in  efficiency  and  finish  those  originally 
specified. 

2.  Specify  date  when  shipment  is  desired,  with  route  and  method  of  shipment,  i.  e.,  parcel  post, 
express  or  freight.  BOXING. 

No  Charge  for  Boxing  and  Cartage  except  on  orders  of  $10.00  or  less;  then  a  nominal  charge  will  be 
made  if  the  boxing  exceeds  five  per  cent  of  the  value  of  the  shipment.  Prices  are  F.  O.  B.  Chicago, 
unless  otherwise  specified.  TERMS. 

Terms  are  net,  thirty  days  after  delivery.  Orders  from  parties  unknown  to  us  should  be  accom- 
panied by  remittance  or  by  satisfactory  business  references. 

Note:  Unless  otherwise  directed,  invoices  and  statements  will  be  mailed  to  the  person  placing 
the  order,  upon  whom  we  relv  to  O.  K.  the  Bills  Promptly  and  thus  Expedite  Payment 

REMITTANCES. 

Remittances  should  be  in  exchange  at  par  in  Chicago,  as  we  are  obliged  to  pay  exchange  upon  all 
private  checks,  except  from  a  few  of  the  largest  cities. 

SHIPMENTS. 

Unless  otherwise  ordered,  shipments  are  made  by  us  At  Once,  by  such  routes  as  will  insure  earliest 
delivery.  Large  shipments  are  made  by  freight  and  smaller  shipments  by  express  or  parcel  post,  as 
seems  expedient  to  us.  CLAIMS  FOR  BREAKAGE. 

We  employ  only  experienced  packers  and  guarantee  our  goods  to  be  in  first  class  condition  when 
delivered  to  the  carrier.  Our  responsibility  ceases  at  that  point,  and  all  claims  for  damage  or  breakage 
must  be  made  upon  the  carrier  responsible  for  their  safe  delivery.  We  shall  be  glad  to  aid  in  any  way 
possible  in  the  prosecution  of  such  claims  and  the  recovery  of  damages. 

ORIGINAL  CASES. 

We  especially  recommend  that  our  customers  take  advantage  of  quantity  purchases.  American 
manufacturers  of  glassware  and  porcelain  have  made  it  possible  to  secure  these  commodities  in  original 
case  lots  at  wholesale  prices.  RETURNED  GOODS. 

In  order  to  avoid  the  delays  incident  to  the  identification  of  returned  goods,  we  respectfully  insist 
that  no  articles  be  sent  in  without  first  notifying  us  as  to  the  reason  for  their  return  and  the  disposition 
to  be  made  of  them.  Frequently  adjustments  can  be  made  without  the  necessity  of  returning  the  goods. 
If  after  consideration  it  appears  necessary  that  the  goods  be  returned,  we  shall  send  suitable  shipping 
tags  which  will  insure  prompt  attention  upon  their  receipt. 

NOTICE  TO  THE  TRADE. 

Special  notice  is  given  to  the  trade  that  this  catalog  is  copyrighted,  and  that  unauthorized  repro- 
duction of  new  cuts  or  illustrations  therefrom  constitutes  actionable  infringement  of  our  rights.     We 
shall  use  every  legal  means  to  protect  our  work  and  property. 
Copyrighted    1918   by    Central    Scientific   Company.  CENTRAL  SCIENTIFIC  COMPANY. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


No.  120. 
ABDERHALDEN  REAGENTS,  see  Blood  Testing  Apparatus. 

102.     ABSORBENT  COTTON,  best  quality. 

Size    of    package,    ounces 1  4  1  (i 

Each    $0.10          .20  .35  .65 

ABSORPTION  APPARATUS  for  Chlorine,  see  No.  2828. 

106.  ABSORPTION  TUBE,  Babo's,  filled  with  glass  beads.  Total  length,  13  inches;  diameter  of  body, 
1  inch.  Will  take  an  8  inch  column  of  beads  $3.25 

108.     ABSORPTION  TUBE,  Camp's.     Length  of  body,  13  inches;  diameter,  1\{6  inch 3.00 

110.  ABSORPTION  TUBE,  Emmerling's,  filled  with  glass  beads.  Total  length,  15%  inches;  diam- 
eter of  body,  1  inch.  Will  take  an  8  inch  column  of  beads 3.90 

112.  ABSORPTION  TUBE,  Fisher's,  for  the  absorption  of  carbon  dioxide  or  water  in  elementary 
organic  analysis  in  place  of  the  usual  U  tubes.  It  has  the  following  advantages:  30  cc  capac- 
ity instead  of  22  cc  of  the  ordinary  11  cm  U  tubes;  more  easily  and  thoroughly  cleaned; 
only  one  hollow  stopper  which  shuts  off  both  openings  with  one  turn;  will  stand  on  the  bal- 
ance pan;  and  needs  no  hangers  when  joined  in  the  absorption  train.  When  filled,  the  bottle 
weighs  about  65  grams.  (See  Journal  of  Industrial  and  Engineering  Chemistry,  Vol.  VIII,  No. 
4,  for  April  1916,  page  368) 5.00 

114.  ABSORPTION  TUBE,  Fleming's,  for  carbon  determinations  in  iron  and  steel  by  the  combustion 
method.  Very  rapid  and  exact,  retaining  every  trace  of  carbon  dioxide  and  moisture.  One 
charge  of  soda  lime  will  absorb  100  combustions,  or  one  charge  of  phosphorus  pentoxide  300 
combustions  on  a  1.5  gram  sample  of  0.75  per  cent,  carbon  steel 6.00 

116.  ABSORPTION  TUBE,  Hinman's,  used  extensively  for  the  determination  of  ammonia  in  illumin- 
ating gas 75 

118.  ABSORPTION  TUBE,  as  used  by  the  Illinois  Steel  Company  for  absorptions  in  barium  hydrox- 
ide, consisting  of  9  bulbs  with  bent  stem,  for  use  with  a  500  cc  Erlenmeyer  flask.  Total  length 
of  tube,  201/>  inches.  Without  flask.  (See  Journal  of  Industrial  and  Engineering  Chemistry, 
Vol.  VI,  No.  10,  for  October  1914,  page  844) 1.25 

120.  ABSORPTION  TUBE,  Meyer's,  for  the  absorption  of  carbon  dioxide  in  barium  hydroxide;  as 
described  in  Standard  Methods  for  Chemical  Analysis  of  Plain  Carbon  Steel,  adopted  in  1914 
by  the  American  Society  for  Testing  Materials.  Consists  of  a  series  of  10  small  bulbs  hold- 
ing from  10  to  15  ce  each,  with  large  bulbs  at  the  ends  having  a  capacity  equal  to  that  of  the 
small  bulbs  combined 2.60 

122.  ABSORPTION  TUBE,  Nesbitt'S,  for  the  absorption  of  carbon  dioxide  in  soda  lime  in  the  deter- 
mination of  carbon  in  iron  and  steel,  designed  by  C.  E.  Nesbitt,  chief  chemist  of  the  Carnegie 
Steel  Company,  Edgar  Thomson  Works.  A  slight  turn  of  the  stopper  closes  inlet  and  outlet 
tubes,  sealing  the  bulb  for  weighing.  The  bulb  filled  weighs  about  135  grams.  Very  rapid, 
enabling  combustions  to  be  run  in  6  minutes.  As  many  as  100  combustions  may  be  run  on  a 
0.50  per  cent,  carbon  steel  with  1.5  gram  samples  without  refilling 3.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  123. 


No.   128. 


No.  132. 


No.  134. 


123.  ABSORPTION  TUBE,  Nesbitt's  Improved,  same  as  No.  122,  but  with  inlet  tube  extended  inside 

bulb  and  bent  downward  to  diffuse  gas  through  entire  bottle $4.00 

124.  ABSORPTION  TUBE.  Vanier's  (patented),  for  the  absorption  of  carbon  dioxide  in  potassium 

hydroxide  in  determining  carbon  in  steel  by  the  combustion  method.     Designed  by  George  P. 
Yanier,  Chief  Chemist  of  the  Pennsylvania  Steel  Company.     Consists  of  a   potash  bulb   and 

drying  tube  combined,  capable  of  absorbing  100  combustions  without  refilling 10.50 

126.  ABSORPTION  TUBE,  Wesson's,  designed  by  L.  G.  Wesson,  of  the  United  States  Bureau  of 
Standards.  The  apparatus  weighs  20  to  25  grams  empty.  Will  hold  35  grams  of  soda  lime 
and  7  grams  of  calcium  chloride,  and  will  absorb  10  grams  carbon  dioxide  without  renewal. 
A  capillary  tube  between  the  bulbs  is  substituted  for  a  stopcock,  making  the  outfit  very  light. 
(See  Journal  of  Industrial  and  Engineering  Chemistrv,  Vol.  VI,  No.  6,  for  June  1914,  page 

461)   4.00 

For  other  ABSORPTION  TUBES  AND  BULBS,  see  Calcium  Chloride  Tubes;  Potash  Bulbs. 
ACID  BASINS  OR  DISHES,  see  Dishes. 
ACID  JARS,   see  Jars. 

ACID  MEASURES  TOR  MILB^  see  Milk  Testing  Apparatus. 
128.     ACID  PITCHERS,  of  stoneware,  with  handle. 

Capacity,    quarts 124 

Each 40  .50         1.25 

130.  ACID  PROOF  FINISH  for  chemical  laboratory  tables.  While  this  preparation  is  not  absolutely 
acid  proof,  it  is  a  finish  which  has  been  successfully  employed  for  years  in  many  of  the  leading 
laboratories.  Consists  of  two  solutions  with  full  directions  for  applying.  The  finished  top  will 

be  black Per  gallon  (V2  gallon  of  each  solution)     2.50 

132.     ACID  PUMP,  with  force  pump  attached,  for  withdrawing  acid  from  containers.     Will  fit  any 

bottle  or  carboy  having  a  neck  from  1%  to  2%  inches  diameter 8.00 

134.     ACID  PUMP  for  drawing  acids  and  ammonia  from  carboys.     Clamps  hold  it  firmly  to  neck  of 

carboy.     Can  be  operated  by  Air  Pump  No.  1C986,  or  Foot  Blower  No.  1374 6.<X) 

136.  ADAPTERS,  curved,  of  light  glass,  lamp  blown,  bent  at  an  angle  of  45  degrees,  for  use  with  t« 
torts  and  condensers. 

No A  B  C  D 

Length,  mm 150  180  200  250 

Inside  diameter  at  large  end,  mm 18  25  30 

Each 22  .25  .30  .35 

]38.    ADAPTERS,  same  as  No.  136,  but  straight. 

No A  B  C  D 

Each .20  33.  .28  .32 


10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


Q 


No.  1 40. 


No.  142. 


No  152. 


No.  144. 


140. 


144. 


146. 


147. 
150. 

152. 


No.  146. 


AEROSCOPE,  Eettger's,  as  described  in  the  Journal  of  Medical  Research,  Vol.  XXII,  No.  3, 
pages  462  and  463.  Size  of  tube,  6  x  %  inches  ?1.25 

AEROSCOPE,  Standard,  adopted  by  the  American  Public  Health  Association  for  obtaining  bac- 
teria from  air,  according  to  the  design  of  G.  L.  A.  Buehle,  of  the  New  York  Agricultural  Expe- 
riment Station.  Consists  of  a  tube,  made  of  resistance  glass  to  withstand  sterilization,  drawn 
down  at  the  lower  end  to  provide  a  shoulder  for  supporting  a  layer  of  cotton  and  sand. 
Length  of  tube,  110  mm;  diameter  outside,  15  mm.  Complete  with  selected  cork  stopper  anil 
bent  tube.  (See  Journal  of  Agricultural  Research  Vol.  IV,  No.  4,  for  July  19"15) 45 

AGRICULTURAL  APPARATUS,  see  Soil  Analysis  Apparatus. 

AIR  BATHS,  see  Drying  Ovens. 

AIR  METERS,  see  Anemometers. 

AIR  PUMPS,  BLOWERS,  see  Blowers. 

AIR  PUMPS  for  Piltration,  see  Filter  Pumps. 

AIR  PUMPS  for  Vacuum  and  Pressure,  see  Pumps,  Air. 

AIR  SAMPLING  APPARATUS,  Palmer  Water  Spray,  for  testing  dust  and  bacteria  in  air. 
The  apparatus  consists  of  an  exhaust  fan,  connected  directly  to  a  universal  motor,  operating 
on  a  110  volt  circuit,  which  draws  air  through  a  venturi  meter,  the  flow  through  which  is 
indicated  in  cubic  feet  of  free  air  per  minute  on  an  inclined  manometer.  The  air  to  be  sampled 
is  drawn  through  a  small  quantity  of  filtered,  sterilized  water  placed  in  the  lower  neck  of  a 
special  glass  vessel,  and  the  dust  and  bacteria  taken  out.  This  water  is  then  analyzed  by  stand- 
ard methods,  and  calculations  made  for  the  number  of  dust  particles  or  bacteria  per  cubic  foot 
of  air  drawn  through.  The  apparatus  is  enclosed  in  a  mahogany  case,  18  x  9  x  6%  inches,  with 
a  damper  on  the  top  to  regulate  the  rate  of  flow  of  air.  Weight,  about  15  pounds.  (See  Jour- 
nal of  Industrial  and  Engineering  Chemistry,  Vol.  VI,  No.  3,  for  March  1914;  American  Journal 
of  Public  Health,  Vol.  VI,  No.  1,  for  January  1916;  and  Vol.  VII,  No.  1,  for  January  1917) 
125.00 

AIR  TESTER,  Wolpert's  (Carbacidometer),  for  obtaining  the  amount  of  carbonic  acid  gas  in  a 
room  by  direct  readings  from  the  graduations  etched  on  the  glass,  thus  doing  away  with  all 
computations  and  tables  as  in  the  old  forms.  Another  advantage  of  this  form  is  that  the  air 
of  a  room  may  be  secretly  tested,  if  desired.  Directions  and  full  set  of  capsules  for  making 

test  solutions  furnished  with  each  instrument 4.00 

EXTRA  CAPSULES  for  No.  146.     In  boxes  of  12  capsules  (six  of  each  reagent) . .  .Per  box     1.00 

AIR  THERMOMETER  TUBE,  of  glass,  with  stem  30  cm  long.     Diameter  of  bulb  50  mm . .       .17 

AIR  THERMOMETER  TUBE.     Same  as  No.  150,  but  with  capillary  stem.     Diameter  of  bulb 

50  mm  .  .29 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


11 


No.  I6O 


No.  156 


Nos.  162-4. 


No.  168. 


154. 


156. 


157. 
160. 

162. 


164. 


ALCOHOLOMETER,  see  Hydrometers. 

ALKALIMETERS.  see  Carton  Dioxide  Determination  Apparatus. 

ALTTNDTJM  CEMENT,  COMBUSTION  BOATS,  CRUCIBLES,  DISHES,  FILTERS,  ETC.,  see 
Cement.  Combustion  Boats,  Crucibles,  Etc. 

AMMETERS,  see  Electrical  Instruments. 

AMMONIA  ABSORPTION  APPARATUS,  Cumming's,  as  modified  by  the  Bureau  of  Standards, 
for  the  determination  of  ammonia  in  illuminating  gas.  Can  be  filled,  emptied  and  rinsed, 
without  disconnecting.  Gives  complete  absorption  when  run  at  0.6  cubic  foot  per  hour.  (See 
Circular  48,  United  States  Bureau  of  Standards)  $6.50 

AMMONIA  ABSORPTION  APPARATUS,  Folin's,  complete  with  Folin  Absorption  Tube,  cyl- 
inder with  rubber  stopper,  drying  tube,  and  bottle.  Height  of  cylinder,  12  inches;  capacity  of 
bottle,  6  ounces 3.25 

AMMONIA  ABSORPTION  TUBE,  Folin's.    Tube  only  of  No.  156 1.60 

AMMONIA  ABSORPTION  APPARATUS,  Referees',  filled  with  glass  beads.    Adopted  as  official 


by  the  Metropolitan  Gas  Referees  of  London 
AMPOULES,  of  clear  resistance  glass,  with  flat  bottom. 

No A  B  C  D 

Capacity,  cc. .        1234 

Per  100' 1.75         1.75        2.50         2.50 

AMPOULES,  same  as  No.  162,  but  of  amber  glass. 

No A  B  C  D  E 

Capacity,  cc. .        12345 
PerlOO'..  1.75         1.75         2.50         2.50        3.25 


ottom. 
E 

F 

G 

H 

J 

5 

6 

7 

8 

9 

3.25 

3.25 

3.50 

3.50 

4.00 

F 

6 

3.25 


G 

7 

3.50 


H 

8 

3.50 


J 

9 

4.00 


4.75 

K 

10 
4.00 

K 
10 

4.00 


ANAEROBIC  CULTURE  APPARATUS 


.168. 


170. 


174. 


ANAEROBIC  CULTURE  APPARATUS,  designed  by  H.  M.  Jones,  of  the  United  States 
Department  of  Agriculture.  Consists  of  an  Alberene  stone  base  2  cm  thick  and  12  cm  square, 
with  an  annular  groove  to  receive  an  inverted  100  mm  Petri  dish.  The  base  is  provided  with 
outlet  tubes  so  that  gas  and  pyrogallate  methods  may  be  used.  The  groove  may  be  sealed 
with  paraffine  or  other  wax.  The  small  amount  of  air  enclosed,  about  20  cc,  permits  rapid 
results  to  be  secured,  which  are  readily  visible.  (See  Journal  of  Bacteriology,  Vol.  I,  No.  3, 
for  May  1916.  page  339) 2.25 

ANAEROBIC  CULTURE  JAR,  Novy's,  for  gas  and  pyrogallic  acid  methods,  with  removable 
top  permitting  Petri  dishes  to  be  used.  The  two  sections  can  be  clamped  firmly  together,  and 
are  furnished  with  a  rubber  gasket  in  addition  to  ground  flanges,  making  an  'air  tight  joint. 
Height  of  lower  section,  100  mm;  diameter,  140  mm.  Complete  with  three  metal  clamps  and 
gasket 12.00 

ANAEROBIC  CULTURE  TUBE.  Giltner's  H  Tube,  for  the  cultivation  of  anaerobic  and  other 
bacteria.  The  tube  consists  of  two  test  tubes  connected  near  their  mouths  by  a  short  piece 
of  glass  tubing,  permitting  the  culture  to  be  placed  in  one  tube  and  the  chemicals  in  the 
other.  Especially  useful  in  determining  the  presence  of  and  in  isolating  Bacillus  Abortus  from 
infected  mucous  membranes,  as  surface  colonies  may  readily  be  obtained 1.10 

ANATOMICAL  JARS,  see  Jars,  Specimen. 


12 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  S.  A. 


J 


No.  186. 


No.   188. 


184. 


186. 


ANEMOMETER  or  WIND  GAGE,  for  indicating  the  velocity  of  the  wind  in  miles,  consisting  of 
a  vertical  shaft,  to  the  upper  end  of  which  are  fastened  four  arms,  each  carrying  a  Robinson 
hemispherical  copper  cup.  These  cups  turn  in  one  direction,  regardless  of  the  direction  of 
the  wind.  The  registering  dial  is  so  divided  as  to  show  velocities  from  one  hundredth  of  a 
mile  to  10,000  miles.  All  parts  are  interchangeable.  Each  instrument  is  standardized  and 
fully  warranted.  Weight,  3%  Ibs $30.00 

ANIMAL  BOARDS,  of  wood,  with  hook  in  each  corner,  for  use  in  animal  experiments.  Small 
size  suitable  for  guinea  pigs  and  rats;  large  size  for  cats  and  small  dogs. 

No A  B 

Length,    mm 320  650 

Width,   mm 200  300 

Each    3.25  4.00 

188.  ANIMAL  CAGE,  scientifically  designed  and  constructed,  affording  humane  conditions  and  entire 
security  and  convenience  in  studying  animals  undergoing  bacteriological  or  microscopical 
examination.  The  removable  pan  in  the  bottom  renders  the  daily  care  of  the  animals  easy, 
and  permits  the  employment  of  every  precaution  for  insuring  cleanliness.  Dimensions:  18 
inches  long,  18  inches  wide,  and  13%  inches  high 12.00 

192.  ANIMAL  CAGE,  Helm,  with  two  compartments,  for  breeding  mice  and  other  small  rodents. 
Made  of  wood,  lined  with  galvanized  iron,  with  shelf  for  food,  runway  of  wire  cloth  and  re- 
movable drawers.  Dimensions,  20  x  12  x  12  inches 12.00 

194.  ANIMAL  CAGE,  Vaughan's,  collapsible,  rendering  it  easy  to  sterilize.  Sides,  bottom,  and  top 
come  apart  so  that  it  can  be  packed  away  in  small  space.  Height  of  cage,  12  inches;  length, 
20  inches;  width,  15  inches;  height  over  all,  17  inches 15.00 

(For  illustration,  see  page  13.) 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


13 


No.  200. 


No.  204. 


No.  218. 


No.  224. 


No.  220. 


No.  214. 


196.     ANIMAL  CAGE,  Mouse  Jar,  of  glass,  5  inches  in  diameter  by  7  inches  high,  with  wire  gauze 

top  loaded  with  a  heavy  cast  iron  knob $1.60 

8042C.  GLASS  JAR  only  of  Xo.  196,  5x7  inches 1.05 

ANIMALCULAE  CAGES,  see  Projection  Apparatus. 
For  INSECT  CAGES,  see  Xos.  8000  and  8004. 
200.     ANIMAL  HOLDER,  of  metal,  for  inoculating  mice,  with  adjustable  clamp  for  holding  the  tail. 

Cage  may  be  removed  from  base 2.00 

202.     ANIMAL  HOLDER,  Kitasato's  Mouse  Holder.   A  nickel-plated  metal  table,  fully  adjustable  by 
means  of  a  ball  and  socket  joint,  with  adjustable  head  holder  and  tail  or  leg  clamp.     With 

this  holder  the  mouse  may  be  placed  in  position   without   assistance 4.80 

2d4.     ANIMAL  HOLDERS,  Voge's  Guinea  Pig  Holders,    for    inoculation,    measurement    of    tempera- 
ture, etc.     Consists  of  a  slotted  cylinder  with  perforated  base. 

No A  B 

Height,   mm 180         200 

Diameter,  mm 60  80 

Each    .90        1.25 

214.  ANNEALING  CUPS,   of  selected  clay.     Used  extensively  for  silica  fusions. 

Xo 0  1  2 

Size,   inches 1%  x  1%     1*4  x  1^4     1^x1% 

Per    dozen 1.75  1.75  1.74 

215.  ANNEALING  CUP  COVERS. 

For  cups  Xo 0  1  2 

Per   dozen 40  .40  .40 

216.  ANNEALING  CUP,  Porcelain,  glazed  inside  and  outside  except  on  bottom.     Diameter  at  top, 

38  mm;  diameter  at  bottom,  26  mm;  height,  25  mm;  capacity,  15  cc 18 

218.     ANVIL,  Plattner's,  of  polished  steel,  for  blowpipe  analysis.   "Dimensions,  l^xl^x^   in.       .80 
220.     ANVILS,  Regular  Shape,  steel  face. 

Xo , A  B  C 

Weight  in  pounds 15  50  100 

Length  in  inches  over  all 9  14%  20% 

Each   5.50  10.00  17.00 

224.     ANVIL,  Square,  for  lead  buttons,  6x6  inches,  of  iron,  one  side  planed 1.75 


14 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  236. 


ifft 


No.  238. 


No.  254. 


Itfo.  260. 


244. 


246. 


APRONS,  OVERSLEEVES  AND  LABORATORY  COATS 

236.  APEON,  light  weight,  of  pure  black  rubber  cloth,  acid  and  waterproof,  very  flexible,  accommo- 
dating itself  easily  to  any  position  of  the  body.  Length,  48  inches $0.90 

238.    OVERSLEEVES,  of  same  material  as  No.  236  Apron,  with  elastic  bands  at  top  and  bottom         .50 

240.  APRON,  of  pure  white  rubber  cloth,  especially  suitable  for  use  in  bacteriological  and  biological 
laboratories.  Length,  48  inches 1-30 

242.     OVERSLEEVES,  of  same  material  as  No.  240  Apron,  with  elastic  bands  at  top  and  bottom. 

Per  pair 70 

APRON,  heavy  weight,  of  pure  maroon  rubber  cloth,  of  highest  quality,  very  durable  and  re- 
sistant to  chemical  reagents.  Length,  48  inches 1.50 

OVERSLEEVES,  of  same  material  as  No.  244  Apron,   with  elastic   bands   at   top   and  bottom. 
Per  pair 80 

248.  APRON,  of  heavy,  fine  white  duck  (not  acid  proof),  with  strap  at  neck  and  attached  tie 
strings,  to  protect  clothing  from  flour  and  grease.  Widely  used  in  flour  and  milling  labora- 
tories. Length,  50  inches 85 

250.  APRON,  Asbestos,  fire  and  acid  proof,  made  of  best  medium  weight  Canadian  asbestos  cloth. 
Length,  48  inches;  width,  24  inches 7.50 

252.  LABORATORY  COAT,  of  white  drill,  affording  complete  protection  to  the  clothing.  Widely 
used  in  bacteriological,  biological,  food  and  flour  laboratories.  Buttons  are  easily  removable 
for  laundering;  with  three  pockets  and  adjustable  strap  in  back.  Length,  54  inches.  In  order- 
ing, give  chest  measure  taken  loose  fitting  3.00 

254.  LABORATORY  COAT,  of  tan  covert  cloth,  with  three  pockets,  side  slits,  removable  buttons, 
and  sleeves  buttoning  close  to  wrist.  Length,  50  inches.  In  ordering,  give  chest  measure 
taken  loose  fitting 3.00 

256.  LABORATORY  COAT,  of  linen  drab  duck,  very  heavy,  extensively  used  in  chemical  and  test- 
ing laboratories.  With  four  large  brass  riveted  pockets,  brass  ball-and-socket  buttons,  sleeves 
buttoning  close  to  wrist,  side  slits,  and  strap  at  back.  Length,  54  inches.  In  ordering,  give 

chest  measure  taken  loose  fitting 5-00 

DISSECTING  OR  OPERATING  GOWN,  short  sleeved,  of  white  drill,  with  one  pocket  and  straps 
for  fastening  at  neck  and  waist.  Especially  suitable  for  bacteriological  and  anatomical  lab- 
oratories. Length,  52  inches.  (Can  be  furnished  in  58  inch  length  if  desired.)  In  ordering, 

give  chest  measure  taken  loose  fitting &30 

DISSECTING  OR  OPERATING  GOWN,  same  as  No.  258,  but  with  long  sleeves.  Length,  52 
inches.  (Can  be  furnished  in  58  inch  length  if  desired.)  In  ordering,  give  chest  measure  taken 
loose  fitting 2.40 


258. 


260. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


15 


270. 


271. 
272. 


AQUARIA 

AQUARIUM.  Tank  and  Table,  handsome  in  appearance,  and  exceptionally  well  built.  The  ends 
and  bottom  are  made  of  Alberene  stone,  with  front  and  back  of  clear  plate  glass.  The  glass 
is  set  in  the  stone,  and  cemented  water-tight.  Brass  rods  along  the  top  edges  of  the  glass 
add  to  its  rigidity.  The  plumbing  fixtures  supplied  consist  of  a  vertical  supply  pipe  of  brass, 
nickel-plated,  with  one  outlet  controlled  by  a  valve;  one  vertical  overflow  plug  and  trap;  and 
piping  to  the  floor  line.  All  piping  and  fittings  are  of  brass.  The  wire  gauze  partition  is  of 
brass,  and  is  used  to  divide  the  aquarium  into  two  sections  of  varying  sizes,  as  the  partition  is 
movable.  The  table  is  very  heavy  and  substantial,  of  oak,  with  1%  inch  birch  top. 

The  tank  measures  outside,  50x24x15  inches  deep.  The  table  top  measures  58x32x30  inches 
high. 

The  top  of  the  table  is  furnished  in  natural  water-proof  finish;  the  body  of  the  table  is  given 
one  coat  of  filler  and  two  coats  of  cabinet  rubbed  varnish,  light  antique,  unless  otherwise 
ordered.  Weight  of  the  table  crated,  180  pounds;  of  the  tank,  400  pounds.  Complete  as  de- 
scribed above  with  tank,  table  and  fixtures  $93.00 

AQUARIUM  TANK  only,  with  fixtures,  as  described  under  No.  270 70.00 

AQUARIUM  TABLE  only  of  No.  270 23.00 


274. 


No.  274. 

AQUARIA,   steel  frame,  slate  bottom,  heavy  glass  sides;  well  made  and  nicely  finished, 
measurements  in  the  table  below  are  in  inches  over  all. 

No 

Length,  inches   


Width,  inches 
Height,  inches  . . 
Capacitv,  gallons 
Each  . 


7 
10 

3 

4.80 


B 

16% 

9 
11 

6 

5.80 


11 
12 

9 
7.00 


D 

20% 


13 

13 

12 

8.00 


The 

E 

22% 

13 

14 

15 

10.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  276. 


No.  8042. 


No.  286. 


No.£9O. 


No.  294. 


No.  296. 


276.  AQUARIUM,  iron  frame,  slate  bottom,  heavy  glass  sides;  strong  and  durable.  An  entirely 
satisfactory  and  serviceable  aquarium.  Dimensions  over  all:  26%  inches  long,  17  inches 
wide,  and  15  inches  high.  Capacity,  20  gallons  $19.80 

278.  AQUARIUM,  same  as  No.  276,  but  provided  with  inlet  nipple  with  lock  nuts,  and  outlet 
fitting  with  double  standpipe.  The  construction  of  this  standpipe  prevents  clogging  of  the 
outlet  and  consequent  overflow 27.80 

280.  AQUARIUM,  same  as  No.  276,  but  with  plate  glass  sides,  and  with  over  all  dimensions:  39  inches 
long,  19  inches  wide,  and  21  inches  high.  Capacity,  50  gallons 47.60 

282.     AQUARIUM,  same  as  No.  280,  but  with  inlet   nipple   and   outlet   with  double  standpipe,  as    de 

scribed   under   No.    278 55.60 

8042.    AQUARIA,  Battery  Jars,  of  clear  white  glass,  with  ground  rim. 

No A                B  C  D  E 

Diameter,  mm 100             100  125  150  225 

Height,   mm 100              125  175  200  300 

Each 55              .70  1.05  1.25  3.10 

286.     AQUARIA,  Round,  of  white  glass,  with  reenforced  rim. 

No A         B       C         D 

Diameter,   mm    175     225     250     300 

Height,  mm  175     225     250     300 

Approximate  capacity,  liters 4         8        12       20 

Each    1.65    2.50    3.75    5.35 

290.  ARSENIC  APPARATUS,  Fresenlus,  consisting  of  a  500  cc  Florence  flask  with  two-hole  stopper, 
connected  by  a  glass  tube  to  a  100  cc  Erlenmeyer  flask  with  rubber  stopper  and  outlet  tube. 

Without  support 1.70 

294.     ARSENIC  APPARATUS,  Gutzeit-Bragg,  with  ground  joints 2.00 

296.  ARSENIC   APPARATUS,   Marsh,   with   glass  stopcock,  on  polished  wooden  support 2.50 

297.  ARSENIC  APPARATUS,  glass  parts  only  of  No.  296 1.75 

300.     ARSENIC  PLATE  (Streak  Plate) ,  of  unglazed  porcelain  for  arsenic  tests,  60x100x4  mm  thick      .40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


17 


N0.3O4-. 


No.3O6, 


No.3O2. 

302.     ARSENIC  TUBES,  of  hard  glass. 

Stvle  A       B       C       D 

Each    $0.12  .14     .16     .16 

304.     AKSENIC  TUBE,   of  Pyrex  combustion  tubing,  with  constriction.     Length,  15  inches —       .60 

306.     ARSENIC  TUBE,  of  transparent  silica.     Length  over  all,  6   inches;   length   of  constriction.   3 

inches.     May  be  used  repeatedly $1.50 

ASBESTOS  MATERIAL 

308.     ASBESTOS  CEMENT    (Retort   Cement),   fire    and    acid   proof,    for   nse    with   muffles,    retorts, 
electric  furnaces,  etc.    Put  up  in  cans  ready  for  use. 

Weight,  pounds 1         5 

Each    30      .90 

310.      ASBESTOS  CLOTH,  36  inches  wide,  unaffected  by  acid,  fire,  etc. 

Description Fine.       Medium.       Heavy. 

Weight  per  yard,  Ibs 1%  2%  2%' 

Per  yard  . . .' 4.00  5.40  6.80 

312.      ASBESTOS  CORD  or  TWINE,  in  1  pound  balls. 

Xo A  B 

Diameter,  inches   %6  % 

Per  Ib 2.75  2.75 

ASBESTOS  GLOVES  AND  MITTENS,  see  Gloves. 
314.      ASBESTOS  PAPER  for  filtering  acids,  in  rolls  36  inches  wide,  weighing  about  1  pound  to  the 

square  yard.     Thickness,  about  0.028  inch Per  Ib.     $0.40 

316.      ASBESTOS  PADS,  %  inch  thick,  with  iron  bound  edges;  for  protecting  table  tops,  etc. 

Xo A  B  C  D 

Dimensions,  inches 8%i8%         11x11         15x15         10x16 

Each .30  .45  .70  .60 

318.      ASBESTOS  PLATE  or  PAD,  round,  with  iron  bound  edges  and  ring  for  suspension.     Diameter, 

8  inches .10 

320.      ASBESTOS  SHEET,  40x40  inches,  fire  and  acid  proof. 

Thickness,  inches fe  %6  %  %6  %  %  % 

Weight  per  sheet,  Ibs. .        2  12  16  20  32 

Per  square  foot 10  .20  .50  .75  .90  1.20  1.70 

Per  sheet    60  1.20  3.00  4.50  5.50  7.20  10.20 

322.     ASBESTOS  SHEETS,  square,  l^6  inch  in  thickness. 

No A  B 

Dimensions,  inches 4x4  6x6 

Per  dozen   .20  .45 

ASBESTOS    SLATE,   Transit*,    acid-proof,  for  protecting  table   tops,  building  apparatus,  etc. 
The  best  laboratory  material  for  heat  and  electrical  insulation.     Can  be  cut  with  ordinary  saw. 
Thickness,  in %  ^  ifa  %  ifa 

324A.  ASBESTOS  SLATE,  42x48  in Per  sheet       2.70  4.10  5.40  8.00  10.70 

324B.  ASBESTOS  SLATE,  42x96  in Per  sheet        5.40  8.20  10.80  16.00  21.40 

324C.  ASBESTOS  SLATE Per  sq.ft.          .30  .45  .60  .90  1.20 

326.      ASBESTOS  SLATE  SQUARE,  12xl2x%  in.    Superior  to  an  asbestos  pad 30 


18 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


APPARATUS  FOR  TESTING  ASPHALT, 
CREOSOTE  OIL,  PITCH  and  COAL  TAR 


No.  328. 


No.  330. 


No.  332. 


328,  ADHESION  MACHINE,  Kirschbraun's,  for  measuring  the  adhesive  strength  of  asphalt  as  a 
binder  for  crushed  rock  in  paving  construction.  Consists  of  a  dynamometer  reading  to  250 
grams  in  10  gram  divisions,  mounted  on  a  frame  provided  with  a  movable  table  for  holding 
box  containing  sample  to  be  tested.  A  handle  with  a  system  of  gears  is  used  to  press  the 
sample  against  the  ball  on  the  end  of  the  dynamometer  and  then  to  remove  it,  the  scale 
recording  the  adhesive  pull.  As  used  in  the  Chicago  Paving  Laboratory.  Complete  with  two 
sample  cups  and  directions $25.00 

330.  ADHESIVEMETER,   Brown's,   for  determining    the    index    of    adhesion    of   materials    such    as 

road  oils  and  asphalts,  by  the  time  consumed  for  a  standard  rod  to  travel  a  given  distance. 
The  results  obtained  check  very  closely.  Consists  of  a  rigid  cast  iron  frame,  mounted  on 
leveling  screws;  a  steel  rod,  which  is  attached  to  counterbalancing  weights  by  means  of  a 
string  over  a  frictionless  pulley;  and  a  cup  for  the  samples,  immersed  in  a  water  bath.  .155.00 

331.  GLASS  CASE  for  No.  330,  with  electric  heaters    60.00 


332.  BALL   AND  RING  APPARATUS,   American  Society  for  Testing  Materials  Type,  as  described 

in  Tentative  Method  No.  D36-16T  for  the  Determination  of  the  Softening  Points  of  Bitumi- 
nous Materials  other  than  Tar  Products.  The  apparatus  consists  of  a  600  cc  glass  beaker, 
an  aluminum  rack  with  two  plates  for  the  rings;  a  brass  cover  with  hole  for  cork  to  hold 
thermometer;  two  brass  rings  %  inch  in  diameter,  %  inch  deep  with  %2  inch  walls;  and  two 
steel  balls  %  inch  in  diameter,  each  weighing  between  3.45  and  3.50  grams;  with  directions  for 
use.  Without  thermometer 10.00 

333.  BALL  AND  RING  only  of  No.  332 1.00 

13428A.     THERMOMETER  for  No.  332,  reading  to  to  220°P 1.20 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  338. 


No.  340. 


338.  CENTRIFUGAL  EXTRACTOR,  Dulin  Rotarex  No.  1,  capacity  50  grams.  Will  give  complete 
extraction  of  bituminous  aggregates  in  five  minutes.  The  large  size  sample  insures  greater 
accuracy  in  the  analysis  of  coarse  aggregates  and  will  also  extract  enough  bitumen  to  be 
used  for  tests  on  the  asphaltic  cement.  Consists  essentially  of  a  110  volt  A.  C.  or  D.  C.  motor 
mounted  vertically  on  a  cast  iron  base,  directly  connected  to  the  aluminum  extraction  bowl. 
The  bowl  is  surrounded  by  a  cylindrical  copper  shell,  shaped  to  drain  through  a  spout  at  the 
side.  The  solvent  is  introduced  into  the  extraction  bowl  through  the  funnel  shaped  screw 
which  holds  the  filter  ring  and  cover  in  place.  The  outer  cover  is  made  in  two  pieces  so  that 
the  section  immediately  over  the  funnel  may  be  removed  when  the  solvent  is  added.  Com- 
plete with  rheostat,  cord  with  plug  for  attaching  to  lamp  socket,  and  directions  for  operat- 
ing    $71.50 

Extra  Parts  for  Dulin  Rotarex  No.  1 

338A.  ALUMINUM  BOWL,  50  grams  capacity 6.00 

338B.  COVER  for  50  gram  Bowl 2.00 

338C.  FILLER  SCREW  for  50  gram  Bowl 2.00 

338D.  FILTER  RINGS  for  50  gram  Bowl per  100  2.00 

338E.  ALUMINUM  BOWL,  100  grams  capacity 8.00 

338F.  COVER  for  100  gram  Bowl 2.75 

338G.  FILLER  SCREW  for  100  gram  Bowl 2.00 

338H.  FILTER  RINGS  for  100  gram  Bowl per  100  2.00 

340.  CENTRIFUGAL  EXTRACTOR,   Dulin  Rotarex  No.  2,  capacity  1,000  grams,  with  direct  drive 

vertical  type  motor  for  110  volts  A.  C.  or  D.  C.,  enclosed  in  cast  iron  frame.     Complete  with 
rheostat,  cord  with  plug  for  attaching  to  lamp  socket,  and  directions  for  operating 128.00 

Extra  Parts  for  Dulin  Rotarex  No.  2 

340A.  ALUMINUM  BOWL,  1,000  grams  capacity 10.00 

340B.  COVER  for  1,000  gram  Bowl 5.00 

340C.  FILLER  SCREW  for  1,000  gram  Bowl 2.00 

340D.  FILTER  RINGS  for  1,000  gram  Bowl per  100     5.00 

341.  ATTACHMENT  PLUG  for  Xos.  338  or  340,  to  screw  into  a  220  volt  lamp  socket,  permitting  the 

Rotarex  to  be  connected  in  series  with  a  110  volt  lamp,  when  220  volt  circuit  only  is  avail- 
able  .  1.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


No.  342. 


No.  3414. 


No.  346. 


No.  348. 


No.  357. 


342.  COVER,  of  brass,  for  400  cc  beaker,  for  use  in  determining  melting  point  of  asphalts  by  cube 
method.  With  openings  for  thermometer  and  wire,  the  former  so  shaped  as  to  enable  the 
mercury  column  to  be  read  at  the  level  of  the  cover.  Without  thermometer  or  wires.  (Sec 
Bulletin  314  of  the  United  States  Department  of  Agriculture) $0.80 

3414.  CRUCIBLE,  Gooch,  best  American  porcelain,  of  special  form  with  large  filtering  surface,  for 
determining  bitumen  soluble  in  carbon  disulphide.  Height,  24  mm;  width  at  bottom.  35  mm; 
width  at  top,  45  mm;  capacity,  30  cc .50 

346.     CUPS  OR  SAMPLE  BOXES  for  asphalt,  of  tin  plate,  as  recommended  by  the  American  So- 
ciety for  Testing  Materials.     Diameter,  about  2%6  inches;  depth,  about  1%  inches. 
Per  dozen 75 

348.  DEHYDRATING  APPARATUS  for  Tars  and  Creosote  Oils,  as  used  in  the  laboratories  of  the 
Barrett  Manufacturing  Co.  and  the  United  States  Office  of  Public  Roads,  and  recently- 
adopted  as  standard  by  the  American  Society  for  Testing  Materials.  Consists  of  a  cvlindrical 
copper  still  15.8  cm  high  and  9.5  cm  in  diameter,  supported  on  an  iron  stand  and  fitted  with 
a  lid  provided  with  clamp  and  thumb  screw.  The  condenser  consists  of  a  copper  jacket  38.75 
cm  long  with  inner  glass  tube  set  at  an  angle  of  75°.  A  special  combined  separatory  funnel 
and  burette  is  furnished,  with  a  capacity  of  120  cc  with  outlet  tube  graduated  in  V-,  cc  divi- 
sions. Complete  as  illustrated,  with  copper  still,  connecting  tube,  ring  burner  of  brass,  con- 
denser, separatory  funnel,  supports  and  clamps,  but  without  thermometer.  (See  Journal  of  In- 
dustrial and  Engineering  Chemistry,  Vol.  Ill,  No.  4,  for  April  1911;  also  Bulletin  314  of  the 
United  States  Department  of  Agriculture) 38.50 

350.  THERMOMETER  for  No.  348,  graduated  from   0°  to  400°C.  in  1°  divisions  according  to  the 

requirements  of  the  American  Society  for  Testing  Materials 7.50 

Extra  Parts  for  No.  348 

351.  COPPER  STILL,  with  cover,  clamp  and  thumb    screw,    with    tubulature    for    connecting    tube, 

and  with  6  paper  gaskets.    Height  inside,  15  cm;  diameter  inside,  8.7  em 20.00 

2110C.  RING  BURNER,  of  brass,  for  use  with  No.  351 2.20 

353.  CONNECTING  TUBE,  of  glass,  with  side  arm    20 

354.  CONDENSER,  of  copper,  on  support,  without  inner  tube 10.00 

355.  INNER  TUBE  for  No.  354,  of  glass,  about  55  cm  long 40 

356.  SEPARATORY  FUNNEL,  with  stopcock,  capacity  120  cc,  with  outlet  tube  graduated  in   %  cc 

divisions     4.00 

357.  DISH,  Evaporating,  for  use  in  evaporation  test,  of  pure  nickel,  with  flange  and  handle...     1.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


21 


No.  363. 


358. 


DISTILLATION  APPARATUS  for  Tars,  American  Society  for  Testing  Materials  Type,  as  de- 
scribed in  Bulletin  314  of  the  United  States  Department  of  Agriculture,  and  in  Standard 
Method  D20-16  for  the  Distillation  of  Bituminous  Materials  Suitable  for  Road  Treatment.  Con- 
sists of  a  250  ec  Pyrex  Engler  flask,  supported  on  a  ring  stand  and  surrounded  by  a  metal 
shield  with  sight  hole.  The  side  arm  is  connected  by  a  rubber  stopper  to  a  special  type  of 
condenser.  Complete  with  flask,  shield,  condenser,  25  cc  graduate,  support  stand,  two  clamps 
and  4  inch  ring,  but  without  burner  or  thermometer  S6.00 

THERMOMETER  for  No.  358,  see  No.  350. 

360.  DRYING  OVEN,  New  York  Testing  Laboratory  Type,  of  Russia  iron,  double  walled,  covered 

with  asbestos.  The  heat  is  supplied  by  a  10  inch  ring  burner  immediately  beneath  the  air 
space  between  the  two  walls.  The  interior  of  the  oven  is  provided  with  a  perforated  shelf, 
beneath  which  is  a  fan  for  insuring  even  temperature.  The  cover  is  hinged  and  provided 
with  openings  for  thermometer,  thermo-regulator,  etc.  Height,  20  inches;  diameter,  11  inches. 
Without  thermometer  and  thermo-regulator 27.50 

361.  DRYING  OVEN,  of  same  construction  as  No.  360,  but  of  copper 37.50 

362.  DUCTILITY   MACHINE,    Smith's,    improved   form,  for  hand   power,  built  in   a   stone   trough 

heavily  enamel  painted  both  inside  and  out.  Arranged  for  110  em  pull,  and  for  three  bri- 
quettes. All  working  parts  are  of  brass.  With  hand  wheel 160.00 

363.  DUCTILITY  MACHINES,  Smith's,  improved  form,  electrically  driven,  with  direct  connected 

motor. 

No A  B  C  D 

A.  C.  D.  C. 

For.  volts 110          220         110  220 

Price   225.00     250.00     200.00     225.00 


22 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  366. 


No.  370. 


No.  372. 


No.  372. 


No.  368. 


364. 


3G6. 


5227. 

366A. 

366B. 

368. 


370. 
372. 


EVAPOKATOR,  Brown.  Will  reduce  asphaltic  petroleums  to  asphalt  in  %th  the  time  usually 
required  by  the  ovens  commonly  used,  giving  results  that  will  agree  among  themselves.  Con- 
sists of  a  cylindrical  iron  oil  bath,  4  inches  high  by  18  inches  in  diameter,  fitted  with  a 
stirring  device  mounted  vertically  with  a  grooved  pulley  at  the  top  for  belting  to  a  motor. 
The  top  of  the  bath  is  of  aluminum  with  pockets  for  the  brass  evaporating  dishes.  A  special 
ring  gas  burner  supplies  heat  under  the  entire  bottom  of  the  oil  bath.  Complete  with  wells 
for  thermometer,  air  gage,  vent  pipe,  opening  for  filling,  and  a  set  of  brass  evaporating 

dishes    $53.00 

EXTRACTION  APPARATUS,  American  Society  for  Testing  Materials  type,  for  free  carbon 
in  tars  and  pitches.  Consists  of  a  flask  of  special  shape,  with  spiral  metal  condenser  of 

Cottle  form,  and  wire  support  for  filter  cup    4.50 

CONDENSER  only  of  No.  366,  of  block  tin  with  cover  attached 2.25 

FLASK  only  of  No.  366 1.25 

WIRE  SUPPORT  only  of  No.  366 1.00 

EXTRACTION  APPARATUS,  New  York  Testing  Laboratory  Type,  for  the  extraction  of  bi- 
tuminous material  from  paving  mixtures  containing  broken  stone.  Consists  of  a  metal  cylin- 
der, inside  which  fits  a  second  cylindrical  metal  vessel  which  holds  the  solvent.  A  wire 
basket  holding  500  grams  of  the  disintegrated  paving  material  is  suspended  in  the  inner 
vessel,  and  an  inverted  conical  condenser  provided  with  outlets  for  water  circulation  is 
placed  in  the  top.  The  heat  is  supplied  by  a  16  C.  P.  incandescent  lamp,  mounted  on  the  wood- 
en base  and  projecting  into  the  bottom  of  the  outer  cylinder.  With  175  to  200  cc  of  carbon 
disulphide,  500  grams  of  sample  should  extract  clean  in  three  hours.  Complete,  without  lamp 

bulb 35.00 

ALUNDUM  THIMBLES  for  No.  366,  see  No.  5244. 

FLASH  POINT  TESTER,  Elliott  or  New  York  State  Board  of  Health  Type,  as  modified  by  the 

Underwriters'  Laboratories,  with  Bunsen  burner  and  with  Thermometer  No.  13444 A 10.00 

FLOW  PLATE  AND  MOLD  for  comparing  fluidities  of  asphalt  cements  at  their  melting  points. 
Set  consists  of  two  flow  plates,  each  with  six  corrugations,  and  mold 6.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  H.  A. 


23 


No.  379. 


o 

No.  381. 


No.  374. 


No.  383. 


No.  376. 


No.  386. 


No.  384. 


No.  382. 


374 


375. 

376. 
379. 


380. 


381. 

382. 
383. 
384. 


386. 


FREEZING  APPARATUS,  designed  by  Prevost  Hubbard,  of  the  United  States  Office  of  Public 
Roads,  for  determining  the  percentage  of  paraffine  scale  in  bituminous  materials.  Consists  of 
an  inverted  bell  jar  surrounded  by  a  cover  of  felt.  A  copper  jacket  is  held  in  the  neck  of 
the  bell  jar  by  a  rubber  stopper.  A  glass  filter  tube  wrapped  with  blotting  paper  fits  inside 
the  copper  jacket,  and  extends  through  the  rubber  stopper  which  fits  into  the  500  cc  filter 
flask.  Complete  with  support  stand,  clamps,  bell  jar,  two  500  cc  filter  flasks,  rubber  stopper, 
etc.,  as  illustrated,  but  without  thermometer.  (See  Bulletin  314,  United  States  Department 

of  Agriculture) $15.00 

THERMOMETER,  Special,  for  Xo.  374,  graduated   from  -25°C   to   0°C   in  %°    divisions,  with 

-20°  mark  at  least  14  cm  from  bulb 5.00 

HOLDER  for  Bitumen,  Draper  type 3.50 

HYDROMETER,  Sommer  (patented),  recommended  by  the  Committee  of  the  American  Society 
of  Civil  Engineers.  Consists  of  small  cylindrical  vessel  in  two  parts,  the  upper  one  of 
which  takes  up  the  shrinkage  and  can  be  removed  after  chilling.  The  lower  part  contains 
exactly  10  ec.  The  specific  gravity  is  determined  by  suspending  it  from  the  hook  of  a  special 
hydrometer,  graduated  to  read  directly  from  0.850  to  1.300  at  25°C.  Complete  with  brass 
receptacle  and  fittings,  with  directions  for  use.  (See  Journal  of  Industrial  and  Engineering 

Chemistry,  Vol.  II,  Xo.  5,  for  May,  1910) 12.00 

HYDROMETER,    Sommer,    same    as   Xo.    379,   but   with   hydrometer   graduated   from    0.950   to 

1.100    ". 12.00 

HYDROMETERS  for  Creosote  OH,  see  general  heading  Hydrometers. 

MOLD,   Asphalt   Briquette,    of   brass,   for  use    in    ductility    machine,    with    removable    center 

pieces    5.00 

MOLD,  Cube,  of  brass,  with  brass  plate,  for  two  one-half  inch  cubes  for  melting  point  test  5.00 

MOLD,  Cube,  Barrett  type,  of  brass,  for  one-half  inch  cubes,  with  iron  clamp 3.00 

OVEN.  Melting  Point,  or  Air  Bath,  Barrett  type,  for  the  determination  of  the  melting  point  of 
tar.  Consirts  of  copper  cylinder  with  observation  window  of  mica.  Inner  vessel  of  copper 

can  be  removed  for  cleaning 10.00 

PENETROMETER,  Humboldt,  latest  improved  form  with  fine  adjustment,  for  determining  the 
consistency  of  bituminous  solids,  by  means  of  the  penetration  of  a  No.  2  Boberts'  needle  at 
77°F.  under  a  definite  load  in  a  given  time.  For  loads  of  50,  100,  and  200  grams,  with  dial 
graduated  in  100  divisions  of  ylo  mm  each 60.00 


24 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


No.  388. 


No.  391. 


No.  392. 


No.  1734. 


388.  PENETEOMETER,  Standard,  New  York  Testing  Laboratory  type.    Operates  on  the  same  prin- 

ciple as  the  Humboldt,  but  is  provided  with  stop-clock  for  timing  the  duration  of  the  test  by 
half -second  beats,  and  with  dial  graduated  in  360  degrees,  each  of  which  represents  "i,\0  mm 
of  penetration.  With  adjustable  weights  for  loads  of  50,  100,  and  200  grams,  leveling  screws, 
adjustable  platform  and  adjustable  mirror  for  lighting  the  specimen.  For  full  description, 
see  Richardson  ' '  The  Modern  Asphalt  Pavement, ' '  page  565 $68.00 

389.  PENETEOMETEES,   Electrically  Controlled,  -similar   to   No.   388,   but   with   magnetic    control, 

which  entirely  eliminates  the  personal  equation.     Adaptable  to  1.5  or  60  second  penetrations. 

Type  A  includes  a  rectifier  to  convert  the  alternating  into  direct  current. 

No A  B 

For,   volts 110  A.C.  110  B.C. 

Each 175.00       150.00 

390.  PENETEOMETEE,  Miniature,  for  portable  work,  about  half  the  size  of  the  standard  instru- 

ment, with  same  needle.     Without  clockwork     30.00 

391.  PENETEATION  NEEDLE,  improved  form,  designed  by  Charles  S.  Reeve  and  Fred  P.  Pritchard 

of  the  Office  of  Public  Roads  and  Rural  Engineering  of  the  United  States  Department  of 
Agriculture,  and  adopted  as  standard  by  the  American  Society  for  Testing  Materials.  (See 
Journal  of  Agricultural  Research,  Vol.  V,  No.  24,  for  March  13,  1916,  page  1121) 60 

392.  PYKNOMETER,  Barrett  Type,  50  cc  capacity,   for  specific   gravity  of   tar   and  pitch.      (See 

Journal  of  Industrial  and  Engineering  Chemistry,  Vol.  V,  No.  3,  for  March  1913,  page  195)      2.00 

1734.  PYKNOMETER,  Hubbard's,  for  fluid  and  semi-solid  bitumens,  designed  by  Prevost  Hubbard  of 
the  Office  of  Public  Roads.  Consists  of  a  heavy  tube  70  mm  long  and  22  mm  in  diameter, 
with  accurately  ground  stopper  made  concave  on  under  side.  A  hole  16  mm  in  diameter  passes 
through  stopper  and  connects  with  this  hollow  space,  permitting  air  to  escape  easily.  Capac- 
ity, about  24  cc;  weight  empty,  about  28  grams.  (See  Bulletin  314,  of  the  United  States 
Department  of  Agriculture) 2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  ~C.  S.  A. 


25 


Nos.  394,  5  and  6    assembled. 


No.  404. 


394.  RETORT,  Tubulated,  for  the   distillation  of  creosote  oil,  according  to  the  specifications  of  the 

American  Society  for  Testing  Materials.  Capacity,  about  250  cc;  length  of  condenser  tube, 
about  36  cm.  (See  Standard  Method  No.  D38 — 17  for  Sampling  and  Analysis  of  Creosote 

Oil)    $0.90 

THERMOMETER  for  No.  394,  see  No.  350. 

395.  CONDENSER,  Glass,  for  use  with  No.  394.    Length,  about  25  cm .75 

396.  SHIELD,  Galvanized  Iron  Covered  with  Asbestos,  for  use  with  No.  394,  for  protection  from  air 

currents  and  for  preventing  radiation 1.50 

397.  SLIDE  BOX,  Barrett  Type,  of  copper  with  six  corrugations  for  slide  test  of  pitch 6.00 

398.  SPECIFIC  GRAVITY  PAN,  American  Society  for  Testing  Materials  Type,  of  nickel,  for  deter- 

mining the  specific  gravity  of  solid  and  semi-solid  fractions  of  creosote  oil.    Diameter  of  top, 

2.5  cm;  depth,  1.2  cm.     With  hook  for  attaching  to  balance 1.00 

VISCOSIMETER,  Engler's,  ?ee  Oil  Testing  Apparatus. 

400.  VISCOSIMETER,  New  York  Testing  Laboratory  Type,  for  the  viscosity  of  bituminous  binders 

at  90°F.  Consists  of  a  concave  aluminum  float  6  inches  in  diameter,  and  a  brass  collar  which 
screws  into  the  base  of  the  float.  Complete  with  three  standardized  brass  collars.  (See  Engi- 
neers' Record  for  May  1,  1909) 8.50 

401.  PLATE,  Brass,  5x8  cm,  for  use  in  filling  the  brass  collar  of  No.  400 40 

402.  VISCOSITY  APPARATUS  (Penetrometer) ,  Schutte  Type,  for  Tarvia  X  and  soft  pitch,  as  used 

by  the  Barrett  Manufacturing  Company.  Consists  of  a  tube  of  brass  2  x  10%  inches,  with 
wire  handle  for  suspending.  A  hollow  plug  of  brass,  1  inch  long  with  %  inch  bore,  screws 
into  opening  in  lower  end.  Complete  with  circular  disk  of  tin  plate  for  retaining  pitch  while 
plug  is  being  filled 6.00 

403.  PLUG  only  of  No.  402,  of  brass 1.60 

For  THERMOMETERS,  HYDROMETERS,  DRYING  OVENS,  WATER  BATHS,  DISTILLING 

FLASKS,  etc.,  see  proper  general  headings. 
ATOM  MODELS,  see  Models. 

404.  AUGER  BITS,  set  of  13  high  grade  bits  in  hardwood  case;  %  to  1  inch  by  sixteenths  of  an  inch. 

.' 6.30 

405.  AUGER  BITS,  good  quality. 

Size,  16ths  of  an  inch..       3        4        5        6        7        8        9       10      11      12      13      14      15      16 
Each 58     .48     .48     .48     .48     .48     .58     .58     .68     .68     .78     .78     .90     .90 

406.  AUGER  BIT,  Clark's  adjustable  expansion  bit,  cutting  from  ^  inch  to  1%  inches 1.00 


26 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


408A. 
408B. 
409  A. 
409B. 
410A. 
410B. 
411A. 
411B. 


Nos.  408-411. 


Nos.  412-5. 


AUTOCLAVES 

AUTOCLAVES,  Steam  Pressure  Sterilizers,  horizontal  form,  for  rapid  sterilization.  Constructed 
of  heavy  polished  copper  with  double  wall.  Mounted  on  substantial  iron  stand  which  can  bo 
permanently  fastened  to  the  floor.  Below  the  sterilizer  is  a  detachable  steam  generator  which 
eliminates  any  danger  of  burning  out  the  sterilizer  should  the  water  be  entirely  used  up.  The 
autoclave  may  be  ordered  without  generator  by  those  who  possess  a  source  of  steam  free  from 
impurities.  The  circular  door,  made  of  solid  cast  brass,  is  quickly  and  easily  opened,  rolling 
back  on  a  track  inside  the  sterilizer.  The  door  and  head  are  perfectly  ground  and  fitted, 
requiring  no  packing  or  gaskets  to  make  a  steam  tight  joint.  No  clamps  or  springs  are  re- 
quired to  hold  the  door  shut,  as  it  cannot  be  opened  if  the  least  steam  pressure  remains  in 
the  chamber,  thus  eliminating  the  danger  of  scalding.  The  steam  enters,  circulates  around 
the  inner  jacket  and  is  then  admitted  to  the  inner  chamber  through  an  automatic  valve,  the 
air  being  expelled  through  an  air  cock.  The  safety  valve  is  set  to  relieve  at  15  pounds  pres- 
sure. The  autoclave  may  be  used  as  a  free  steam  sterilizer  by  leaving  the  air  cock  open, 
thus  insuring  a  temperature  of  100°C.  inside  the  inner  chamber.  Complete  with  inner  shelf, 
water  gage,  safety  valve,  steam  gage  and  generator. 

No OB 

Length   inside,   inches 16 

Diameter  inside,  inches 12 

Diameter  of  door,  inches 8 

Without  generator,  burnished  copper  finish $121.25 

Same  as  above,  with  nickel-plated  finish 130.25 

Arranged  for  gas  heat,  burnished  copper  finish  . . .       146.25 

Same  as  above,  with  nickel-plated  finish 155.25 

Arranged  for  electric  heat,  burnished  copper  finish      171.25 

Same  as  above,  with  nickel-plated  finish. 180.25 

Arranged  for  oil  heat,  burnished  copper  finish  . . .       146.25 

Same  as  above,  with  nickel-plated  finish 155.25 

In  ordering  for  electric  heat,  kindly  state  voltage  and  kind  of  current. 

Note: — Crating  will  be  charged  extra  at  manufacturer's  cost. 

AUTOCLAVES,  Horizontal  Type,  of  double  cylinder  form  with  steam  space  entirely  surround- 
ing the  inner  chamber  except  at  entrance  door,  thus  reducing  condensing  surface  to  a  mini- 
mum. By  this  arrangement  the  inner  chamber  becomes  perfectly  dry  within  a  brief  time 
after  withdrawal  of  steam.  A  special  control  valve  at  the  side  with  dial  and  indicator,  per- 
mits the  operator  to  regulate  easily  the  admission  or  withdrawal  of  the  steam  or  air  from 
the  inner  chamber.  The  independent  generator  can  be  easily  taken  apart  for  cleansing  and 
repairs.  The  autoclave  is  constructed  of  copper  and  brass,  except  the  door,  which  is  of 


IB 

2B 

3B 

4B 

20 

24 

28 

28 

16 

20 

22 

25 

10 

12 

14 

16 

143.75 

175.00 

225.00 

308.00 

155.00 

190.00 

245.00 

333.00 

168.75 

200.00 

250.00 

333.00 

180.00 

215.00 

270.00 

358.00 

193.75 

225.00 

275.00 

358.00 

205.00 

240.00 

295.00 

383.00 

168.75 

200.00 

250.00 

333.00 

180.00 

216.00 

270.00 

358.00 

CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


27 


4lL\ 
413. 
414. 
415. 


416. 
417. 
418. 
419. 

420. 


No.  416.  No.  420. 

AUTOCLAVES,  Horizontal  Type,  Continued. 

bronze,  deeply  concaved  for  strength.  The  two  walls  of  the  steam  chamber  are  of  Seamless 
drawn  copper  and  brass,  the  inner  lined  with  pure  block  tin.  Around  the  outer  is  a  heavy 
outside  jacket  to  prevent  radiation  of  heat  and  condensation  of  steam  between  the  walls.  The 
instrument  is  mounted  on  a  white  enameled  tubular  steel  stand.  Complete  with  steam  gen- 
erator, water  gage,  safety  valve,  air  valve,  pressure  gage  for  steam  jacket,  vacuum  and  pres- 
sure gage  for  inner  chamber,  and  necessary  valves  marked  for  use. 

Xo " A  B  C  D  E 

Length,   inches 19  20  22  24  28 

Diameter,   inches 9  12  14  16  20 

Arranged  for  steam  heat $270.00       333.00       414.00       477.00       612.00 

Arranged  for  gas  heat 270.00       333.00       414.00       477.00       612.00 

Arranged  for  oil  heat 283.50       346.50       427.50       502.20       649.80 

Arranged  for  electric  heat 310.00      374.00      470.00      520.00      657.00 

AUTOCLAVES,  Foot  Power,  improved  model  with  door  controlled  by  a  foot  pedal,  a  patented 
feature  of  this  instrument.  Foot  pressure  on  the  pedal  closes  the  door  and  locks  it  in  place 
steam  tight  instantly,  leaving  both  hands  free  and  eliminating  any  possibility  of  scalding.  The 
steam  generator  is  enclosed  in  the  copper  pedestal  base,  which  is  lined  with  asbestos,  insulat- 
ing and  confining  the  heat,  so  that  steam  is  generated  with  great  rapidity.  This  design  also 
makes  the  autoclave  more  economical  as  well  as  more  convenient  to  operate.  All  supply  pipes 
are  brought  up  from  the  floor  inside  of  the  base,  making  a  neat,  compact  installation.  Con- 
structed of  cold  rolled  copper  and  bronze  steam  metal  castings,  nickel-plated  throughout. 
Complete  with  steam  and  return  water  supply,  gas  and  safety  valves,  air  cocks,  steam,  tem- 
perature and  water  gages. 

No A  B  C  D  E 

Length,   inches 20  24  28  28  30 

Diameter,   inches 17  20  23  26  28 

Diameter  of  door,  inches 10  12  14  16  IS 

Arranged  for  fas  neat 180.00      216.00      306.00      405.00      450.00 

Arranged  for  oil  heat 195.00       238.50       336.00       450.00       510  00 

Arranged  for  electric  heat 202.50       247.50       345.00       457.50       525.00 

Arranged  for  steam  heat 180.00       216.00       306.00       405.00       450.00 

In  ordering  for  electric  heat,  kindly  state  voltage  and  kind  of  current. 

AUTOCLAVES,  High  Pressure,  for  sterilization  or  digestion  under  high  steam  pressure:  widely 
used  for  vulcanizing  in  dental  laboratories.  Consists  of  a  wrought  iron  pot  with  heavy  cast 
iron  cover  accurately  fitted  to  make  a  steam  tight  joint,  and  held  in  place  by  stud  bolts  pro- 
jecting through  the  flange.  Tested  to  stand  a  pressure  of  60  atmospheres  or  about  900 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


e^^_— 
sssm 


421. 


424. 
425. 
426. 
427. 
428. 
429. 


No.  421. 


No.  422. 


No.  426. 


C 

10 

11 

80.00 


AUTOCLAVES,  High  Pressure,  Continued. 

pounds.     The  safety  apparatus  is  an  effectual  safeguard  against  explosions.  Complete  with  gas 
heater,  thermometer,  wrenches,  manifold  with  blow-off  valve  and  safety  apparatus. 

No .'       A  B 

Diameter  inside,  inches 0  8 

Depth  inside,  inches 8  11 

Each    : $60.00        67.00 

GAS  REGULATOR  for  Autoclaves  No.  420,  designed  to  screw  into  manifold.  Easily  attached. 
By  means  of  this  device  the  gas  flow  is  automatically  controlled  to  maintain  any  desired  tem- 
perature or  pressure.  Provided  with  special  attachment  for  keeping  burner  lighted  when  gas 

flow  is  reduced  to  low  pressure 19.25 

422.  AUTOCLAVES,  Pressure  Cookers,  of  cast  aluminum,  very  useful  for  sterilization  or  digestion 
under  pressure.  Extensively  used  in  domestic  science  laboratories  for  cooking  under  pressure. 
Can  be  used  over  any  laboratory  burner.  Complete  with  pressure  gage  reading  to  30  pounds, 
safety  valve,  petcock,  and  attachment  for  thermometer. 

No 

Diameter  at  top,  inches 

Greatest  diameter,  inches 

Depth,    inches 

Capacity,    quarts 

Weight,   pounds 8% 

Shipping  weight,  pounds 11 

Each    19.00 


A 
8 
10 
10 
10 


B 

9% 


12 

17 

14% 

J9 
25.00 


12% 
14 
25 
21 
28 
31.00 


AUTOCLAVES,  Pressure  Sterilizers,  single  wall,  made  of  steel  boiler  plate,  riveted  and  calkod 
at  the  seams,  with  heavy  flange.  The  cover  is  of  semi-steel  with  sanitary  packing  and  thumb 
screw  clamps  to  hold  firmly  in  place,  and  is  provided  with  handles.  The  equipment  includes 
polished  copper  crate  tinned  inside  to  hold  articles  to  be  sterilized,  platform  for  crate,  safety 
valve,  steam  gage,  steam  circulating  device,  thumb-nut  wrench,  and  cover  lifting  device  (on 
two  larger  sizes).  Finished  in  aluminum  bronze.  When  ordered  without  burner  or  coil,  adjust- 
able support  stand  will  be  furnished. 

No A 

Tested  for  pressure,  pounds 30 

Height  of  retort,  inches 18 

Diameter,   inches 12 

Height  over  all,  inches 39% 

Width   over   all,   inches 26 

Sterilizing  capacity,  cubic  inches 1350 

Shipping   weight,   pounds 130 

Size  of  crate,  inches Il%xl3 

Without  gas  burner  or  coil 50.00 

With  gas  burner 60.00 

With  gasoline  burner 60.00 

With  steam  coil 60.00 

With  coil  and  gas  burner 65.00 

With  coil  and  gasoline  burner 65.00 


B 

C 

50 

50 

18 

27 

18 

25 

40i/2 

53 

30 

40 

2475 

7620 

235 

440 

14x15 

21x22 

65.00 

125.00 

85.00 

145.00 

85.00 

145.00 

85.00 

145.00 

90.00 

150.00 

90.00 

150.00 

CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  S.  A. 


432. 
433. 
434. 


436. 
437. 
438. 


440. 
441. 

442. 


Nos.  432-438. 


Nos.  440-442. 


AUTOCLAVES,  Vertical  Type,  with  riveted  boiler,  made  of  heavy  polished  copper,  tin  lined, 
with   seamless  bottom.     Provided  with  perforated  tray  with  two  shelves.     The  lid  is  made  of 
cast  brass,  nickel-plated,  and  ground  perfectly  to  fit  flange  which  is  provided  with  six  thumb 
screw  clamps  to  hold  lid  firmly  in  place.     The  instrument  is  guaranteed  for  a  pressure  of  35 
pounds.     The  safety  valve  is  set  at  30  pounds  but  may  be  adjusted  to  suit  operator.     A  pet- 
cock  is  supplied  which  must  be  k«pt  open  until  the  steam  escapes,  thereby  forcing  all  the  air 
out  of  the  boiler.     With  base  of  sheet  iron  8  inches  high.     Dimensions  inside:    diameter,  11 
inches;  height,  24  inches.     Height  over  all,  44  inches.     Complete  with  pressure  gage,   ther- 
mometer, safety  valve  and  heating  arrangement  as  listed  below. 
No  .........................................  A 

Style   .......................................   copper  with 

removable  lid 
Arranged  for  gas  heat  ........................       $  90.00 

Arranged  for  oil  heat  ........................          94.00 

Arranged  for  electric  heat  ....................         134.00 

In  ordering  for  electric  heat,  kindly  state  voltage  and  kind  of  current. 

AUTOCLAVES,  same  as  No.  432  but  larger,   with    10    screw    clamps    and   hinged   lid.     Inside 
dimensions:   diameter,  14  inches:  height,  26  inches.    Height  over  all,  46  inches.    Complete  with 
heating  arrangement  as  listed  below. 

No.     ........................................................  A 

Finish   ......................................................       copper 

Arranged  for  gas  heat  ........................................       117.00 

Arranged  for  oil  heat  ........................................        121.00 

Arranged  for  electric  heat  ....................................        170.00 

In  ordering  for  electric  heat,  kindly  state  voltage  and  kind  of  current. 
BURNER.  Quadruple  Gas,  for  No.  432,  see  Burner,  Quadruple,  No.  2056. 
BURNER.  Gas,  Low  Form,  extra  large  for  No.  436,  see  Burner,  Gas,  No.  2108. 
BURNER,  Oil,  for  No.  437,  see  Burner,  Oil  Stove,  No.  2220. 

AUTOCLAVES,  Vertical  Type,  with  seamless  boiler,  made  of  drawn  copper,  highly  polished  and 
lacquered.  The  cover  is  of  cast  brass,  nickeled,  is  ground  on  the  bevel  to  fit  inside  flange  of 
boiler,  which  is  provided  with  thumb  screws  to  clamp  lid  firmly  in  place.  Provided  with 
rack  for  supporting  articles  to  be  sterilized.  The  autoclave  is  guaranteed  to  stand  a  pressure 
of  50  pounds.  Complete  with  thermometer,  pressure  gage  registering  to  30  pounds,  safety 
valve,  escape  valve  for  air  and  steam,  sheet  iron  base  8  inches  high,  and  an  asbestos  mat. 


B  C 

copper  with  nickel-plated 

hinged  lid.  with  hinged  lid. 

96.00  100.00 

100.00  114.00 

140.00  145.00 


B 

nickel-plated 
121.00 
125.00 
175.00 


Height  inside,  inches  .............................................  12 

Diameter  inside,  inches  ...........................................  8 

Arranged  for  gas  heat  ............................................  75.00 

Arranged  for  oil  heat  ............................................  79.00 

Arranged  for  electric  heat  ........................................  125.00 

For  STERILIZERS  of  other  types,  see  general  heading  Sterilizers. 

BACTERIOLOGICAL  APPARATUS,  see  special   headings,    Autoclaves,   Incubators,    Sterilizers, 
etc. 


B 
24 
11 

95.00 
99.00 
145.00 


C 
26 
13 

118.00 
126.00 
178.00 


30 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  S.  A. 


No.  450. 


BALANCES,  ANALYTICAL,  CHAIN 

In  the  chain  analytical  balances  is  presented  an  entirely  new  feature  of  balance  construction. 
The  old  rider  arrangement  is  done  away  with  entirely,  and  the  finer  weighings  are  obtained  by  chang- 
ing the  length  of  a  small  gold  chain  attached  at  one  end  to  the  beam  of  the  balance,  and  at  the  other 
to  a  vernier  which  slides  on  a  graduated  vertical  column.  The  vernier  is  operated  by  a  spiral  drive 
controlled  from  a  milled  head  on  the  outside  of  the  case.  By  this  means  all  weighings  from  l/10th  milli- 
gram to  50  milligrams  can  be  made  without  opening  the  case  or  using  the  beam  arrest.  In  this  way 
the  rapidity  and  accuracy  of  weighing  is  greatly  increased,  as  there  are  no  small  weights  to  handle  and 
count  and  no  rider  to  move  back  and  forth.  We  estimate  that  75  per  cent  of  the  time  used  in  making 
a  weighing  is  saved  by  this  new  method. 

The  balances  themselves  are  of  the  finest  construction,  with  large  agate  planes,  finely  ground  knife 
edges,  and  separate  pan  arrest.  The  base  is  covered  with  a  heavy  black  glass  plate. 

450.   BALANCE,  Analytical  Chain,  Christian  Becker  No.  8-A. 


Capacity    200   grams. 

Sensitiveness    1/20  milligram. 

Diameter    of    pans 2%    inches. 


Length   of   beam 7    inches. 

Bearings      agate     planes. 

Knife    edges agate. 


Independent    arrest  for   pans   with    automatic    stop. 
Width   of  pan   support   4   inches;    wider   if   specified. 

Polished  mahogany  and  glass  case,  g'ass  top,  front  sliding  frame  counterpoised. 

Dimensions    of    case:    16 Vt    inches   long:    9    inches   wide;    18%    inches    high.      Specific    gravity    support   and 
holder   for   weighing   test    tubes,   with    counterpoise,  furnished. 

Price,  with  Chain  Vernier  attachment,  mounted  on  black  plate  glass  base $175.00 

452.    BALANCE,  Analytical  Chain,  Christian  Becker  No.  15. 

Capacity    100    grams.  Length    of   beam 6    inches. 

Sensitiveness     1/20     milligram.        Bearings     agate. 

Diameter    of    pans 3    inches.  Knife    edges agate. 

Independent   arrest    for  pans    with   automatic    stop. 

Width   of  pan   support   4   inches;    wider   if   specified. 

Polished  mahogany  and  glass  case,   glass  top,   front  sliding  frame  counterpoised. 

Dimensions  of  case:      1614    inches  long;    9  inches  wide;   18%   inches  high. 

Price,  with  Chain  Vernier  attachment,  mounted  on  black  plate  glass  base 130.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


31 


BALANCES,  ANALYTICAL,  VOLAND 


No.  454. 


No.  458. 


The  balances  listed  below  present  certain  new  features  in  their  construction,  which  should  com- 
mend their  use  in  rapid  yet  precise  chemical  weighing.  They  are  of  simple  construction,  easily 
adjusted,  and  with  small  danger  of  shifting  sensibility  since  they  are  supported  from  a  single  point 
on  a  broad  central  agate  plane.  The  releasing  mechanism  is  of  the  fallaway  type,  controlled  by  an 
eccentric  shaft  turned  by  the  milled  head  in  the  front.  The  red  graduati&n  of  the  index  plate  and  the 
white  graduation  of  the  black  beam  facilitate  rapid,  accurate  readings.  The  short  beam  provides 
short  periods  of  oscillation.  The  patented  rider  arrangement  makes  it  possible  to  work  on  either  side 
of  the  zero  line  and  prevents  the  rider  from  slipping  back  on  the  shank  of  the  hook.  All  bearings 
are  of  agate.  All  cases  are  of  mahogany  finely  finished,  and  provided  with  glass  on  all  sides,  admitting 
light  freely  to  all  parts.  The  front  door  is  counterpoised  and  slides  freely.  The  list  below  includes 
types  from  which  one  may  select  a  balance  for  any  kind  of  technical  or  analytical  work. 

454.   BALANCE,  Analytical. 

Distinctive  Features: — 

Beam  of  hard  bronze. 

Beam  graduated  in   100  divisions   on  each  side  of  zero. 

Two  vial   levels  in  plain   sight   from  front. 

Rear  door  can  be  raised  or  removed 

Base   completely    covered    with    heavy   black   plate  glass  and  fitted  with  large  drawer  for  weights. 

Patented  rider  arrangement   provided  with  starter  for  swinging  beam,   operated  from  without  case. 

Knife   edges   relieved    from    contact   with    bearings  when  not  in  use. 

Pan   arrest    separate  from    release;    can   be    locked. 

Specifications : — 

Dimensions  of  case....l6'4   x  19  x 

Length  of  beam 7   inches. 

Diameter    of    pans 2H    inches. 

Width  of  bows 4  inches. 

Equipment  Furnished: — 

One  pair  3  inch  watch  glasses. 

Three   10-niilIigram   riders. 

Wood  bench  for  specific  gravity  work. 

Price    5140  00 

456.    BALANCE,  Analytical.     Same  as  No.  454,  but  with  metal  parts  heavily  gold-plated 150.00 

458.    BALANCE,  Analytical.   Similar  to  No.  454,  but  of   simpler   construction.     Beam  of   aluminum,   0 
inches  long,  graduated  in  50  divisions  on  each  side  of  zero.     Base  of  wood,  with  drawer.     Di- 
mensions of  case,  16y2xl9x9y2  inches  high.     Sensibility,  1/10  mg;  capacity,  200  grams. 
Furnished  with  one  pair  3  inch  watch  glasses,  two  5  mg  riders,  and  a  wood  bench  for  specific 
gravity  work 85.00 

460.   BALANCE,  Analytical.    Same  as  No.  458,  but  with  heavy  black  plat* 
hogany  base 


inches.       Capacity     200    grams. 

Sensibility    l/20th  milligram. 

Weight    of   rider 10    milligrams. 


•lass  base  over  the  ma- 
93.00 


32 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


402. 


464. 
466. 

468. 

470. 


472. 
474. 


No.  462. 


No.  470. 


BALANCE,  Analytical,   a  rapid   short  arm  balance    of    moderate   price    especially    suitable    for 
industrial  work.     Widely  used  in  flour  milling  and  baking  laboratories. 

Distinctive  features:  — 

Short  beam  of  hard-rolled  aluminum. 

Beam  graduated  in  50  divisions  each  side   of  center. 

Spirit  level  in   rear  of  base  of  column. 

Rear   door   can   be   raised   or  removed  for  weighing  pipettes,  etc. 

Large  drawer  for  weights. 

Patented    rider   arrangement. 

Separate   pan   arrest,    stopper  of   which    can   be   locked. 


Capacity      

Sensibility    

Weight   of    rider. 


.  100  grams. 

. l/10th  milligram. 

.5  milligrams. 


Specifications  :  — 

Dimensions   of  case....  16  Vi  x  19  x  9V&   inches. 

Length  of  beam  .......  6  inches. 

Diameter    of    pans  .....  2^   inches. 

Width  of  bows  ........  4%   inches. 

Equipment  furnished:  — 

One  pair  3-inch  watch  glasses. 

Two  5-inilligram   riders. 

AVood  bench  for  specific  gravity  work. 

Price    .............................................................................    $75.00 

BALANCE,  Analytical.  "  Same  as  No.  462,  but  with  all  metal  parts  heavily  gold  plated  .  .  .  85.00 
BALANCE,  Analytical.  Same  as  No.  462,  but  with  heavy  black  plate  glass  base  over  the 

mahogany   base  ....................................................................      85.00 

BALANCE,  Analytical.  Same  as  No.  466,  but  with  all  metal  parts  heavily  gold  plated.  .  .  95.00 
BALANCE,  Analytical. 

Distinctive  features:  — 

Short   beam  of  hard-rolled    aluminum. 

Beam  graduated  in   50  divisions  on  each  side  of   center. 

Large  drawer  in  base  for  weights. 

Patented   rider  arrangement. 

Knife  edges   relieved   from  contact  with   bearings  when  not  in  use. 

Separate  pan  arrest,   stopper  of  which  can  be  locked. 

Time  of  complete    oscillation    12   seconds. 


Specifications : — 

Dimensions  of  case.  . .  .  16H  x  19  x  9 ^ 

Length  of  beam 6   inches. 

Diameter    of    pans 2%    inches. 

Width    of    bows 4%    inches. 

Equipment  furnished: — 

One  pair  3-inch  watch  glasses. 
Two  5-milligram  riders. 

Price    . 


inches.  Capacity   100  grams. 

Sensibility    l/20th  milligram. 

Weight    of    rider 5  milligrams. 


Wood  bench  for  specific  gravity  work. 
Weighing  tube  stand  and  counterpoise. 


. . .  90.00 
BALANCE,  Analytical.  Same  as  No.  470,  but  with  heavy  black  plate  glass  base  over  the 

mahogany  base 98.00 

BALANCE,  Analytical.  Same  as  No.  472,  but  with  capacity  200  grams,  and  sensibility 

1/20   mg 105.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


33 


No.  476. 


476.    BALANCE,  Analytical,   large  capacity.     Suitable  for  calibration  work. 
Distinctive  features: — 

Long  beam  of  hard-rolled  alloy. 

Beam  graduated  in   100  divisions  on  each  side  of  zero. 

Rear  door  can  be  raised  or  removed. 

Large  drawer  for  weights. 

"Wide  pans  and  high  bows. 

Patented  rider  arrangement. 

Separate   pan   arrest  which  can  be  locked. 

Large  capacity. 

Specifications : — 

Dimensions   of  case 26  x  27  z  15  inches.        Height    of    bows 13  94  inches. 

Length  of  beam 12  inches.  Capacity 1000  grams. 

Diameter    of   pans 5  inches.  Sensibility    1/10     milligram. 

Width  of  bows 6  inches.  Weight   of   rider 10  milligrams. 

Price $210.00 

478.    BALANCE,  Analytical.     Same  as  No.  476,  but  with  heavy  black  plate  glass  over  the  ma- 
hogany base • 230.00 

480.    BALANCE,  Analytical.     Same  as  No.  478,  but  with  metal  parts  heavily  gold  plated 260.00 

482.    BALANCE,  Analytical.    Same  as  No.  478,  but  with  capacity  of  2,000  grams 265.00 

484.   BALANCE,  Analytical.    Same  as  No.  482,  but  with  metal  parts  heavily  gold  plated 295.00 


31 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


SUMMARY  AND  COMPARISON 

OF  SPECIFI 

Balance 

Capacity 

Sensibility 

Kind  of  beam 
and  length 
in  inches 

Kind  of 
case 

Type  of 
release 

450 

200    gm 

1/20  mg 

Bronze 

7 

Polished 
mahogany 

Separate  pan 
and  beam 

452 

100     gm 

1/20  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

454 

200    gm 

1/20  mg 

Bronze 

7 

Polished 
mahogany 

Separate  pan 
and  beam 

456 

200    gm 

1/20  mg 

Bronze 
7 

Polished 
mahogany 

Separate  pan 
and  beam 

458 

200    gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

460 

200     gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

462 

100     gm 

1/10  mg 

Aluminum 
(3 

Polished 
mahogany 

Separate  pan 
and  beam 

464 

100    gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

466 

100     gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

468 

100    gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

470 

100    gm 

1/20  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

472 

100    gm 

1/20  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

474 

200    gm 

1/20  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

476 

1000  gm 

1/10  mg 

Aluminum 
alloy,  12 

Polished 
mahogany 

Separate  pan 
and  beam 

478 

1000  gm 

1/10  mg 

Aluminum 
alloy,  12 

Polished 
mahogany 

Separate  pan 
and  beam 

480 

1000  gm 

1/10  mg 

Aluminum 
alloy,  12 

Polish'ed 
mahogany 

Separate  pan 
and  beam 

482 

2000  gm 

1/10  mg 

Aluminum 
alloy,  12 

Polished 
mahogany 

Separate  pan 
and  beam 

484 

2000  gm 

1/10  mg 

Aluminum 
alloy,  12 

Polished 
mahogany 

Separate  pan 
and  beam 

486 

200    gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

488 

200    gm 

1/10  mg 

Aluminum 
6 

Polished 
mahogany 

Separate  pan 
and  beam 

CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


35 


^ 

CATIONS  OF  ANALYTICAL  BALANCES 

Graduation  of 
beam 

Band  of 
base 

Distinctive  features 

Price 

Not 
graduated 

Black    glass 
with  drawer 

Chain     attachment.       Large     ca- 
pacity.    Rapidity. 

$175.00 

Not 
graduated 

Black    glass 
with  drawer 

Chain  attachment. 
Rapidity. 

130.00 

Roth  sides  10  mg 
in  l/10th 

Black    glass 
with  drawer 

Patented  rider  arrangement.    Red 
graduation  of  index  plate. 

140.00 

Both  sides  10  mg 
in  l/10th 

Black    glass 
with  drawer 

Same   as   above  with  gold-plated 
parts. 

150.00 

Both  sides  5  rag 
in  l/10th 

Wood 
with  drawer 

Simple    construction.      Large    ca- 
pacity. 

85.00 

Both  sides  5  mg 
in  l/10th 

Black    glass 
with  drawer 

Same  as  above  with   plate   glass 
base. 

93.00 

Both  sides  5  mg 
in  l/10th 

Wood 
with  drawer 

Xo    arrest   for   end    knife   edges. 
Grooved  agates. 

75.00 

Both  sides  5  mg 
in  l/10th 

Wood 
with  drawer 

Same   as  above  with  parts   gold- 
plated. 

85.00 

Both  sides  5  mg 
in  l/10th 

Black    glass 
with  drawer 

No  arrest  for  end  knives.     Plate 
glass  base.     Grooved  agates. 

85.00 

Both  sides  5  mg 
in  l/10th 

Black    glass 
with  drawer 

Same   as  above  with  parts  gold- 
plated. 

95.00 

Both  sides  5  mg 
in  l/10th 

Wood 
with  drawer 

Knife    edges    free    from    contact 
when  at  rest.    High   sensibility. 

90.00 

Both  sides  5mg 
in  l/10th 

Black    glass 
with  drawer 

Same   as  above  with   plate   glass 
base. 

98.00 

Both  sides  5  mg 
in  l/10th 

Black    glass 
with  drawer 

As   above   with   larger 
capacity. 

105.00 

Both  sides  10  mg 
in  1/1  Oth 

Wood   base 
with  drawer 

Large     capacity.       Long     beam. 
Large  case. 

210.00 

Both  sides  10  mg 
in  l/10th 

Black    glass 
with  drawer 

Game   as   above  with   plate   glass 
base. 

230.00 

Both  sides  lO.mg 
in  l/10th 

Black    glass 
with  drawer 

Same  as  above  with  parts   gold- 
plated. 

260.00 

Both  sides  10  mg 
in  l/10th 

Black    glass 
with  drawer 

Very      large      capacity.        Large 
case. 

265.00 

Both  sides  10  mg 
in  l/10th 

Black    glass 
with  drawer 

Same   as   above  with  parts   gold- 
plated. 

295.00 

One  side  10  mg 
in  l/5th 

Wood 
X  o    drawer 

Small    case.      No    drawer.      Low 
price. 

42.50 

One  side  10  mg 
in  l/5th 

Black    glass 
N  o    drawer 

Same   as   above   with  plate   glass 
base. 

50.00 

36 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


CENCO  ANALYTICAL  BALANCE 


BALANCE,  Cenco  Analytical,   designed  to  meet  the  needs  of   educational  and   commercial  lab- 
oratories  for   an   economical   analytical   balance. 

Made  specially  for  us  by  Voland  &  Sons,  one  of  the  largest  and  best  known  balance  makers  in 
America,  it  has  all  of  the  special  features  which  have  made  their  balances  distinctive.  The 
entire  cost  of  the  balance  is  in  essentials,  as  the  balance  has  been  simplified  and  the  cost  of 
construction  reduced  to  the  lowest  possible  figure  by  means  of  automatic  processes  and  ma- 
chinery. We  believe  that  a  comparison  of  this  balance  with  those  of  other  makes,  either  Amer- 
ican or  foreign,  will  show  it  to  be  superior  to  any  balance  now  obtainable  for  the  same  amount. 


Specifications : — 

Beam    polished  aluminum. 

Length  of  beam 6  in.  graduated  in  l/5th  mg 

Divisions  of   beam 50  to  right  of  center. 

Size   of   case 16 1A  x  17  x  9  &  inches. 

Distinctive  features: — 


Capacity      200    grams. 

Sensibility 1/10  mg. 

Knife  edges   and   bearings agate. 

Weight   of    rider 10  mg. 


Knife  edges  free  from  contact  when  balance  is  at  rest. 

Independent    arrests    for   beam,    stirrups    and   pans. 

Fenders  at  end  of  stirrup  supports   to  check  extreme    swing    of    beam    and    prevent    jarring    or    sliding    of 

stirrups  on  knife  edges. 
High  sensibility  and  rapidity  of  swing. 
Graduations  of  beam  white  on  black  background. 
Index  plate  graduated  in  red. 

No  steel  in  construction  of  balance  and  hence  no  corrosion. 

Case  of  fine  polished  mahogany  with  counterpoised  front  door  and  glass  on  all  sides 
Simple  rider  construction  with  patented  rider  hook. 

486.    BALANCE,  Cenco  Analytical,  with  wooden  case  and  leveling  screws $42.50 

488.    BAIiANCE,  Cenco  Analytical,  same  as  No.  486,  but  with  black  plate  glass  base 50.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


37 


BALANCES,  ASSAY 


No.  492. 


490.  BALANCE,  Assay,  Ainsworth  Type  C  with  Improved  Multiple  Eider  Carriage.  Type  C  Balance 
is  designed  for  particularly  accurate  work,  such  as  control  and  umpire  assays.  The  Multiple 
Kider  attachment  further  adapts  it  for  rapidity  in  making  a  large  number  of  analyses,  as  in 
assay  offices,  smelters  and  mills.  By  means  of  this  attachment,  buttons  up  to  42  milligrams 
can  be  weighed  without  opening  the  case.  As  the  riders  are  handled  automatically,  they  pre- 
serve their  shape  and  accuracy.  Each  rider  has  an  individual  arm,  cannot  be  misplaced,  and 
can  be  operated  while  the  beam  is  in  motion.  The  numbers  on  the  arms  which  have  been 
lowered,  indicate  the  weight  of  the  riders  on  the  beam,  and  when  through  weighing,  all  riders 
are  reset  simultaneously  by  a  reverse  movement  of  the  thumb  piece.  The  beam  is  made  of 
special  alloy,  of  truss  form,  unobstructed  at  the  top  so  that  the  rider  can  be  placed  at  any 
point.  Provided  with  improved  star  wheel  adjustment  and  cylindrically  ground  glasses  for 
reading  divisions. 

Distinctive  features: — 

Multiple  rider  carriage. 
Highest  degree  of  accuracy. 
Rapidity  in  weighing. 

Specifications: — 

Length  of   beam,    12.7  cm   graduated   in   50   divisions  each  side  of  center. 

Sensibility,   1/500  milligram,   reduced  to   1/200   milligram  for  rapidity. 

Period  of  vibration,   7   seconds. 

Capacity  of  rider  carriage,  42  mg. 

Pan  rests  of  fallaway  type. 

Skeleton  hangers  of  German  silver. 

Jretal  parts  gold  plated. 

Bearings   of  agate. 

Plate  glass  sub-base. 

Case    20x17x10    inches    of    seasoned    mahogany,  dust  proof,  with  counterpoised  door  and  drawers. 

Price    $335.00 


492.    BALANCE,  Assay,  Ainsworth  Type  A,  for  rapid  and  accurate  weighings,  where 
of  work  is  handled. 

Specifications : — 


a  large  volume 


Beam  of  brass,  12.7  cm  in  length,  graduated  in   50  divisions  each  side  of  center. 

Sensibility,   1/200  milligram. 

Period  of  vibration,    7  seconds. 

Pan  and  beam  arrest  of  fallaway  type. 

Skeleton  hangers  of  nickel  silver. 

Metal  parts  lacquered. 

Bearings  of  agate. 

Plate  glass  sub-base. 

Case    20  x  17  x  10    inches,    of    seasoned    mahogany,    dust   proof,   with   counterpoised   door   and  drawers. 

Reading    glasses   for    beam    and    index,    the    index  glass  of  specially  ground  cylindrical   form. 

Price    250.00 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


No.  494. 


No.  496. 


494.   BALANCE,  Assay,  Ainsworth  Type  EA,  a  moderate  priced,  short  arm  Balance  of  quick  action 
with  a  sensibility  of  1/100  milligram. 
Specifications : — 


Beam    of    heavy    alloy,    12.7  cm    in   length,    grad- 
uated   in    50    divisions    each   side   of  center. 
Sensibility,    1/100    milligram. 
Period  of  vibration,   5   seconds. 
Pan  and   beam  arrest  of  fallaway  type. 
Skeleton   hangers  of  nickel   silver. 

Price    


Metal  parts  lacquered. 

Bearings  of  agate. 

Plate  glass  sub-base. 

Case    20x  17  x  10    inches,    of    polished    mahogany,    dust 

proof,   with  counterpoised  door  and   drawers. 
Reading  glass  for  index. 
$160.00 


496.    BALANCE,  Assay,  Voland,  as  used  for  carbon  weighing  in  steel  analysis. 
Specifications: — 


Beam    of   aluminum   alloy,    6   inches    long,    subdi- 
vided  in  50  divisions  on  right  side  of  center. 
Capacity,  25  grams. 
Sensibility,    1/100  milligram. 
Skeleton  hangers  of  German  silver. 
Period  of  vibration,   10  seconds. 

Price    


Metal  parts   lacquered. 

Knife  edges  of  accurately  ground  knife  steel  and  bear- 
ings of  agate. 

Case  15x13x8  inches  of  seasoned  mahogany,  with 
counterpoised  door  and  drawer. 

75.00 


No.  498. 


No.  500. 


498.    BALANCE,  Assay,  Troemner's  Portable  No.  132,  with  carrying  case  of  walnut,   provided  with 
lock  and  key,  trunk  strap  and  handle.     Size  of  carrying  case,  8y2  x  9^  x  5  inches.  Total  weight 
of  outfit  6%  pounds. 
Specifications : — 

Beam  of  aluminum  alloy,  10  cm  in  length,   grad- 
uated   in    50    divisions    each    side    of    center, 
fitted  with  locking  device   to  hold  beam  rigid 
when  carrying. 
Sensibility   1/100  milligram. 
Pan  and  beam  arrest  of  fallaway  type. 
Complete  with  set  of  accurately  adjusted  platinum  weights  from  1  gram  to  1/10  milligram,  and 
riders    91.00 

500.    BALANCE,  Assay,  Pocket,  for  use  in  traveling. 

Improved  form  with  eccentric  lift  for  beam.    When    closed    measures    6x2%  x  H4     inches.      Capacity,    10 

grams;    sensibility.    Vt    milligram. 
Complete  in  case  with  set  of  weights  from  10  grams  to  1  milligram 18.00 


Skeleton   hangers   of  nickel   silver  with  aluminum   pans 
Metal   parts   lacquered. 
Bearings  of  agate. 

Case     7}&  x  8^4x2%      inches,     of    polished     mahogany, 
with  counterpoised  door  and  drawer. 


CEXTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


39 


BALANCES,  PULP 


No.  502A. 


No.  504. 


502. 


BALANCES,  Pulp,  mounted  on  polished  mahogany  box  with  drawer  into  which  the  whole  bal- 
ance may  be  packed  away.  Provided  with  leveling  screws  (except  Xo.  502A)  fitted  with  steel 
bearings,  adjusting  screws  on  end  of  beam,  and  weight  pans  with  handles. 


Number 

A. 

B. 

C. 

D. 

E. 

P. 


Capacity 

60  gm  or    2  oz. 

60  gm  or    2  oz. 

150  gm  or    5  oz. 

300  gm  or  10  oz. 

600  grn  or  20  oz. 

1500  gm  or  50  oz. 


Sensibility 
Img 
Img 
2mg 
5  mg 
5  mg 
10  mg 


Diameter 

of  pans 

mm 

75 

75 

88 

100 

125 

150 


Beam 
length 

mm 

150 

150 

200 

225 

275 

300 


Price 
$13.00 
17.00 
22.25 
31.50 
38.00 
40.50 


504.  BALANCES,  Pulp,  similar  in  construction  to  the  above,  but  with  agate  bearings.  Provided  with 
beam  and  end  hanger  supports  which  relieve  the  knife  edges  from  contact  with  the  bearings 
when  the  beam  is  at  rest,  thus  protecting  the  knife  edges  and  preserving  the  sensibility.  Fitted 
with  leveling  screws  and  level. 


Number 

A. 

B. 

Diameter 
of  pans 

mm 

75 
88 


Capacity 
60  gm  or    2  oz. 
150  gm  or    5  oz. 

Beam 

length 

mm 

150 
200 


Sensibility 
Img 
Img 


Price 
24.75 
34.00 


No.  506. 


506.  BALANCE,  Pulp,  similar  to  above  but  mount- 
ed on  mahogany  box  with  white  marble  top. 
Beam  is  divided  into  nine  equal  parts  on 
each  side  of  the  center,  enabling  a  rider  to 
be  used  instead  of  small  fractional  weights. 
A  high  grade  pulp  balance  for  those  who 
prefer  one  without  a  case.  It  is  especially 
valuable  for  moisture  determinations,  for 
weighing  pulp  and  sugar,  and  for  solution 
work.  Bearings  of  agate.  Capacity,  60  gm 
or  2  oz. ;  sensibility,  1  mg:  diameter  of  pans, 
75  mm;  beam  length,  150  mm 27.50 


40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


BALANCES,  PULP,  IN  CASE 


No.  508. 


No.  510. 


508.  BALANCES,  Pulp,  in  polished  mahogany  case  with  counterpoised  sliding  front  door  and  drawer 
for  weights.  Beam  provided  with  adjusting  screws  and  steel  bearings.  Case  mounted  on  level- 
ing screws  and  fitted  with  level. 

Beam 
length 
Number  Capacity  Sensibility 


B. 

C. 
D. 
E. 
F. 


60  gm  or    2  oz. 

150  gm  or    5  oz. 

300  gm  or  10  oz. 

600  gm  or  20  oz. 

1500  gm  or  50  oz. 


1  mg 
2mg 
5mg 
5  ing 
10  mg 


Diameter 

of  pans 

mm 

75 


100 
125 
150 


mm 
150 
200 
225 
275 
300 


Price 
$26.00 
31.25 
43.00 
53.50 
66.50 


510.  BALANCES,  Pulp,  similar  in  construction  to  above,  but  provided  with  agate  bearings  and  with 
arrest  for  beam  and  hangers.  These  balances  are  recommended  for  use  where  exposure  to 
moisture  or  acid  fumes  would  quickly  destroy  steel  edges. 

Diameter  Beam 

of  pans  length 

Number                    Capacity                          Sensibility                   mm  mm                     Price 

A.  60gmor    2  oz.                             1  mg                            75  150                         40.50 

B.  150gmor    5  oz.                             1  mg                            88  200                        50.75 


No.  512.  No.  514. 
512.  BALANCE,  General  Laboratory,  made  entirely  of  magnalium  which  offers  a  high  degree  of  re- 
sistance to  all  laboratory  fumes.  It  has  the  further  advantage  of  being  light  and  strong.  The 
knife  edges  and  bearings  are  of  agate.  The  beam  is  graduated  and  notched  to  facilitate  the 
use  of  rider.  Provided  with  beam  support  and  leveling  screws.  Capacity,  100  grams;  sensibil- 
ity, 2  mg;  diameter  of  pans,  75  mm 23.50 

514.    BALANCE,  Chemical,  with  eccentric  lift.     Beam  150  mm  long,  pans  65  mm  in  diameter.     Mounted 
on  base  with  drawer.     Sensibility,  1  centigram 10.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


41 


BALANCES,  TORSION 


c 


No.  516. 


No.  522. 


In  the  Torsion  Balance  the  twisting  of  a  steel  band  takes  the  place  of  the  knife  edge  fulcrum,  and 
this  with  its  relatively  short  period  of  vibration  makes  the  balance  very  rapid  for  accurate  work, 

Among  those  listed  below  will  be  found  balances  for  practically  every  laboratory  purpose  except 
for  the  most  precise  analytical  work. 

516.  BALANCE,  Torsion,  Cream  Test  Balance.  Enclosed  in  white  enamelled  box  with  index  and 
arrest,  counterpoise  beam  with  sliding  weight  inside  operated  from  without.  Object  pan  con- 
structed especially  for  holding  one  milk  or  cream  test  bottle.  Capacity,  1  bottle;  sensibility,  S 
milligrams.  Complete  with  one  9  gram  and  one  18  gram  weight.  Dimensions,  10  x  &'/$  x  9 
inches  over  all $20.00 

518.  BALANCE,  Torsion,  Cream  Test  Balance.  Same  construction  as  above,  but  with  each  pan  de- 
signed to  hold  two  cream  test  bottles.  Capacity,  4  bottles;  sensibility,  8  milligrams.  Com- 
plete with  one  9  gram  and  one  18  gram  weight 24.00 

520.  BALANCE,  Torsion,  Grain  Test,  designed  according  to  suggestions  of  the  United  States  Depart- 
ment of  Agriculture  expressly  for  determination  of  moisture  in  grain,  according  to  Bulletin  No. 
99,  United  States  Bureau  of  Plant  Industry.  Slide  beam,  9  inches  in  length,  graduated  to  10 
grams  by  l/10th;  scoop,  10%x5%x2*^  inches  with  spout  for  pouring  directly  into  flask; 
weight  plate,  4  inches  in  diameter;  capacity,  1  kilogram;  sensibility,  6%  centigrams.  Com- 
plete with  set  of  brass  weights  in  block,  from  5  grams  to  100 ". 24.00 

522.  BALANCE,  Torsion,  Grain  Test,  designed  especially  for  grading  corn  according  to  the  require- 
ments of  the  Federal  Corn  Grades.  Same  construction  as  No.  520,  but  with  9  inch  beam  grad- 
uated to  furnish  four  simultaneous  readings:  100%  by  %%,  200  grams  by  2  grams,  8%  ounces 
by  %  ounce,  and  70  pounds  per  bushel  by  1  pound.  These  graduations  render  the  balance  use- 
ful in  grain  laboratories  for  a  great  variety  of  purposes,  such  as  moisture  determinations;  per- 
centage of  dirt,  cracked  and  broken  grains;  bushel  weight,  etc 27.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


t 

1700 


3530 


No.  524. 


No.  526. 


5055 


269 


No.  528. 


No.  530. 


524.  BALANCE,  Torsion,  Moisture.  Enclosed  in  white  enamelled  case  with  leveling  screws  and 
index;  four  beams  with  sliding  weights;  two  upper  beams  graduated  for  tare  or  counterpoise; 
lower  beams  graduated  to  10%  by  l/10th,  and  20%  by  2/10ths,  so  that  from  l/10th  of  1  per 
cent  to  30%  of  moisture  in  10  gram  samples  can  be  determined  without  calculation.  Especially 
valuable  for  moisture  in  butter.  Pans,  3  inches  in  diameter,  of  brass  nickel  plated;  capacity, 
120  grams;  sensibility,  13  milligrams.  Dimensions,  10  x  5%  x  9V&  inches  over  all $20.00 

526.  BALANCE,  Torsion,  Moisture,  for  determining  moisture  by  evaporation  from  coal,  grain,  etc. 
Pitted  with  scoop  10%  x  5^  x2i^  inches  with  spout  for  rapid  pour  out.  Weight  plate,  4  inches 
in  diameter;  slide  beam,  12  inches  in  length  graduated  on  upper  side  to  1  pound  by  l/10th 
ounce;  on  lower  side  to  100%  by  1%.  Capacity,  2  pounds;  sensibility,  5  grains 34.00 

528.  BALANCE,  Torsion,  Seed  Testing,  designed  especially  for  seed  analysis  and  for  acidity  of  corn, 
as  described  in  Bulletin  102,  United  States  Department  of  Agriculture.  Enclosed  in  glass  case 
with  cover,  metal  parts  nickeled  throughout.  Object*»pan  shaped  to  form  scoop,  3%x2%xli4 
inches;  weight  pan  of  German  silver  3  inches  in  diameter.  Beam  inside  case  graduated  to  500 
milligrams  by  5  milligrams.  Capacity,  120  grams;  sensibility,  2  milligrams.  Dimensions,  13  x 
6%  x  6%  inches  over  all 52.00 

530.  BALANCE,  Torsion,  Solution  or  Prescription,  in  glass  case  with  cover.  Provided  with  slide  beam 
graduated  from  500  to  5  milligrams,  with  rider  operated  from  outside  of  glass  case.  Pans  of 
German  silver  3  inches  in  diameter;  capacity,  120  grams;  sensibility,  2  milligrams.  An  excel- 
lent balance  for  use  in  making  up  volumetric  solutions,  or  for  prescription  work.  Dimensions, 
13  x6%  x  6%  inches  over  all 45.00 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


43 


3OI5-35OO 


No.  532. 


No.  536. 


No.  540. 


No.  544. 


532.  BALANCE,  Torsion,  Solution,  with  9  inch  nickeled  brass  pans  and  slide  beam,  and  with  high 
poise  ball  and  index.  Length  of  beam  12  inches,  graduated  to  450  grams  by  5  grams;  capacity 
of  balance,  4%  kilograms;  sensibility,  15  centigrams  $27.00 

534.  BALANCE,  Torsion,  Solution,  similar  to  No.  532,  but  with  9  inch  beam,  and  6  inch  pans.  Ca- 
pacity, 2  kilograms;  sensibility,  6%  centigrams.  Slide  beam  graduated  to  100  grams  by  1  gram. 
25.00 

536.  BALANCE,  Torsion,  Solution,  same  construction  and  specifications  as  No.  532,  but  with  counter- 
poised beam.  Bottles,  casseroles  or  beakers  may  be  tared  by  sliding  weight  on  beam,  facilitat- 
ing weighing  and  eliminating  errors.  Capacity,  4%  kilograms;  sensibility,  25  centigrams  30.00 

538.  BALANCE,  Torsion,  Solution,  same  construction  and  specifications  as  No.  534,  but  with  counter- 
poised beam  and  tare  weight  as  in  No.  536.  Capacity,  2  kilograms;  sensibility,  12%  centigrams. 
28.00 

540.  BALANCE,  Torsion,  Solution,  in  glass  and  metal  case,  nickel-plated  throughout.  Slide  beam  inside 
case  graduated  to  100  grams  by  1  gram,  with  rider  operated  from  outside.  Nickeled  brass  pans 
9  inches  in  diameter.  Capacity  of  balance  4%  kilograms;  sensibility,  20  centigrams.  Dimen- 
sions, 20%  x  9%  x  9%  inches  over  all 45.00 

542.  BALANCE,  Torsion,  Solution,  same  construction  as  No.  540,  except  provided  with  poise  ball  and 
index,  increasing  the  sensibility  to  6%  centigrams.  Slide  beam  graduated  to  10  grams  by  l/10th. 
Dimensions,  19%  x  11%  x  8%  inches  over  all 60.00 

544.  BALANCE,  Torsion,  Soil,  with  flat  porcelain  plates,  6  inches  in  dian^ter.  Slide  beam  9  inches  in 
length,  graduated  to  10  grams  by  l/10th.  Capacity,  1  kilogram;  sensibility,  6%  centigrams. 
High  poise  ball  and  index 26.00 


44 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


SUMMARY  AND  COMPARISON  OF  SPECIFI 

Balance 

Capacity 

Sensibility 

Beam   Length 
inches 

Kind  and  size 
of  pans 

516 

1  bottle 

8      mg 

Beam    enclosed 
in  case 

Bottle  holder  and  small 
weight  pan 

518 

4  bottles 

8      mg 

Beam    enclosed 
in  case 

Each     pan     shaped     to 
hold  two  bottles 

520 

1      kilo 

G^2    Cg 

9 

1  scoop  10]/2  x  5%  x  214 
in.      Weight     pan     iron, 
4  in. 

522 

1      kilo 

6J/2  eg 

9 

1   scoop  10^  x  5i/2  x  2% 
in.      Weight    pan    iron, 
4  in. 

524 

120  grams 

13      mg 

4    of    different 
lengths 

Brass  nickeled 
3  in. 

526 

21bs. 

5  grains 

12 

Scoop  10!^x5V2x  21/2  in. 
Weight  pan  iron, 
4  in. 

528 

120  grams 

2      mg 

Beam    enclosed 
in  case 

Object   pan   scoop  3y2  x 
2%xl%  in.  Weight  pan 
German  silver,  3  in. 

530 

120  grams 

2     mg 

Beam   enclosed 
in  case 

German  silver, 
3  in. 

532 

41/2  kilos 

15      eg 

12 

Nickeled  brass, 
9  in. 

534 

2      kilos 

6%  eg 

9 

Nickeled  brass, 
6  in. 

536 

4'^  kilos 

25       eg 

12 

Nickeled  brass, 
9  in. 

538 

2      kilos 

12  y2  eg 

9 

Nickeled  brass, 
6  in. 

540 

4J/2  kilos 

20       eg 

Beam    enclosed 
in  case 

Nickeled  brass, 
'.)   in. 

542 

41/3  kilos 

6%  eg 

Beam    enclosed 
in  case 

Nickeled  brass, 

8  in. 

544 

1      kilo 

6'/2  eg 

9 

Porcelain  flat, 
6  in. 

546 

lOOcc 
bottle 

2      mg 

About    10 

Object   pan   for  holding 
bottle.     No  weight  pan. 

CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  IT.  8.  A. 


45 


CATIONS  OF  TORSION  BALANCES 

Kind  of  graduation 

Case 

Special  features 

Recommended  use 

Price 

Not   graduated,   used 
only  for  counterpoise 

White 

enameled 
box 

Designed     especially 
for  cream  testing 

Cream  testing 

$20.00 

Not  graduated,   used 
only  for  counterpoise 

White 
enameled 
box 

Designed     especially 
for  cream  testing 

Cream    testing' 

24.00 

10  gm  to  1/10  gm 

Not  en- 
closed 

Scoop     pan,     set     of 
weights  included 

Moisture    in    corn 
and  other  grain 

24.00 

100%!%%,  200  gmx 
2  gm,  8%  oz.  x  %  oz., 
70  Ib.  to  bu.  x  1  Ib. 

Not  en- 
closed 

Graduation  for  grain 
testing 

Corn    and    wheat 
grading 

27.00 

Upper  two  beams  for 
tare,  lower  two  to  10 
and  20%  by  l/10th 

White 
enameled 
box 

Beams   for   tare   and 
percentage 

Moisture  and  but- 
ter testing 

20.00 

Upper  side   1   Ib.  by 
l/10th  oz.,  lower  " 
100%  to  1% 

Not  en- 
closed 

Percentage  and   dec- 
imal graduation 

Moisture    in    coal 
and  grain 

34.00 

500  mg  by  5  mg 

Glass   with 
cover 

High  sensibility  and 
scoop  pan 

Seed  analysis  and 
acidity   in   corn 

52.00 

500  mg  to  5  mg 

Glass  with 
cover 

High  sensibility  and 
protection  of  parts 

Solution    or    pre- 
scription 

45.00 

450  gins  to  5  gms 

Not  en- 
closed 

Large  capacity  with 
fair    sensibility 

General   labora- 
tory use 

27.00 

100  gms  to  1  gm 

Not  en- 
closed 

Large   capacity  with 
fair  sensibility 

General  labora- 
tory use 

25.00 

450  gms  to  5  gms 

Not  en- 
closed 

Counterpoise  for 
tare 

Solution  and 
moisture 

30.00 

100  gms  to  1  gm 

Not  en- 
closed 

Counterpoise  for 
tare 

Solution  and 
moisture 

28.00 

100  gms  to  1  gm 

Glass  case 
No  cover 

Large    capacity    and 
protection  of  parts 

Dispensing  or  so- 
lution 

45.00 

10  gm  to  1/10  gm 

Glass  case 
No  cover 

Large  capacity,  pro- 
tection and  high  sen- 
sibility 

Dispensing,    pre- 
scription  and 
grain  testing 

60.00 

10  gm  to  1/10  gm 

Not  en- 
closed 

Sapidity     and     high 
sensibility 

Soil  analysis  and 
general  use 

26.00 

Specific    gravity    up- 
per   beam    .Olx'.OOOl; 
lower  1.4  to  .70x.01 

Metal  and 
ground 
glass 

Specific  gravity  grad- 
uation.     No    loose 
weights 

Specific  gravity 
of  liquids 

55.00 

46 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  546. 


No.  550. 


No.  552. 


No.  553A. 


546.  BALANCE,  Torsion,  Specific  Gravity,  enclosed  in  ground  glass  and  metal  case  with  leveling 
screws  and  index.  Operates  entirely  by  counterpoise  and  slide  beams,  no  weight  pan  or  loose 
weights  being  necessary.  Object  pan  shaped  to  hold  glass  bottle.  Slide  beam  graduated  upper 
part  to  .01  by  .0001,  lower  part  1.40  to  .70  by  .01,  enabling  specific  gravities  to  be  read  directly 
to  the  fourth  place.  Complete  with  glass  bottle  holding  lOOee.  Sensibility,  2  milligrams.  .  $55.00 


BALANCES,  MISCELLANEOUS 

548.  BALANCE,  Automatic,  with  weighing  chart  having  a  range  of  500  grams  by  5  gram  divisions. 
Accurate  reading  is  made  possible  by  the  hair  line  pointer  provided.  Agate  bearings  and  hard- 
ened steel  pivots  throughout,  with  oil  dash  pot  for  regulating  the  sensibility  of  the  balance. 
Equipped  with  a  round  glass  plate  and  finished  in  blue  enamel.  Each  5  gram  division  is 
1.635  mm  wide 50.00 

550.  BALANCE,  Automatic,  same  as  No.  548,  but  with  chart  having  a  range  of  1500  grams  by  5  gram 
divisions.  Each  division  is  .68  mm  wide 55.00 

552.    BALANCE,  Cement  Scale,  for  determining  percentage  of  fineness  of  cement.    Beam  graduated  on 
upper  side  to  16  ounces  by  %  ounce,  lower  side  to  100%  by  1%.     Should  be  used  in  connection 
with  our  No.  12124  sieves.     Can  also  be  used  for  dirt  in  seed,  moisture  in  grain,  ores,  etc. 
Complete  with  brass  scoop 12.00 

553A.  BALANCE,  Cement  Scale,  for  fineness  of  cement.  Capacity  1  pound  by  1/10,000  pound  divisions 
12.50 

553B.  BALANCE,  Cement,  same  as  No.  553A,  but  with  beam  graduated  to  weigh  to  500  grams  by  1/100 
gram  divisions 12.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


47 


Q 


CHATILLONS      , 

ttPRO  VED  CIRCULAR 

SPRING  BALANCE 

TO  VZJGH  3C!fc 

B7  OL-- 


No.  554. 


No.  556. 


No.  560. 


No.  562. 


554.    BALANCE,  Counter  or  Dispensing,  in  ebony  box  with  marble  top  and  nickel-plated  pans. 

No 0  1  2 

Capacity,    Ibs 5  8  10 

Diameter  of  pans,  inches 7  8  9 

Sensibility,  grains    20  20  20 

Each   18.25  21.00  23.50 

556.  BALANCE,  Cream  Test,  for  use  in  connection  with  Babcock  Test.  Especially  designed  for  very 
accurate  weighing  of  cream.  Metal  parts  galvanized  to  make  them  rust-proof;  porcelain  plates 
3x3  inches,  and  agate  bearings.  The  bar  in  front  of  the  balance  is  used  for  balancing  bottle 
and  is  provided  with  the  necessary  weight.  This  scale  is  compact,  being  but  10%  inches  long, 
and  being  of  careful  construction  is  accurate.  Complete  with  one  each  9  and  18  gram  weights. 
Capacity,  one  bottle;  sensibility,  100  mg 814.50 


560. 


562. 


BALANCE,  Cream,  Wisconsin  Hydrostatic.  This  balance  has  been  devised  to  meet  the  demand 
for  a  simple  and  correct  method  of  weighing  cream  into  test  bottles  and  consists  of  a  specially 
devised  brass  float,  which  is  placed  in  a  cylinder  of  water.  Very  accurate  weighings  -can  be 
made  with  this  instrument,  and  as  there  are  no  bearings  to  rust  it  will  retain  its  sensitiveness 
indefinitely.  Complete  with  metal  cylinder,  float  and  9  gram  weight,  but  without  bottle . .  5.50 

BALANCE,  Decimal  Milk.  This  spring  scale  is  intended  especially  for  use  in  connection  with 
the  Babcock  Test  for  keeping  records  of  the  quantity  of  milk  from  individual  cows,  together 
with  the  percentage  of  fat,  so  as  to  calculate  the  butter  yield.  The  scale  is  provided  with  a 
loose  pointer,  which  by  means  of  a  thumb  screw  may  be  set  anywhere  on  the  dial  to  offset  the 
weight  of  the  milk  pail.  The  readings  being  in  pounds  and  decimals  of  pounds  makes  the  cal- 
culation very  much  simpler  than  when  pounds  and  ounces  are  given  as  on  the  ordinary  scale. 
(Decimal  divisions  not  shown  in  the  illustration.)  Capacity,  30  pounds,  weighing  by  1/20  pound 

4.50 


664. 


BALANCE,  Decimal  Milk, 
pound  


Same  as  Xo.  562,  but  with  capacity  of  60  pounds,  weighing  by  1/10 

4.50 


48 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  566. 


No.  570. 


5(56.  BALANCE,  Family  Scale,  Standard,  with  slanting  white  enameled  dial;  weighs  24  Ibs.  by  1  oz. 
divisions;  with  square  sheet  steel  platform  and  tin  scoop $2.50 

568.  BALANCE,  Family  Scale,  Metric.  Same  as  No.  566,  but  for  weighing  10  kilos  by  50  gram 
divisions  3.00 

570.  BALANCE,  Hand,  improved  design.  Manufactured  by  us  to  replace  the  cheaply  made  European 
balances.  The  supporting  stirrup  is  shaped  at  the  top  to  form  a  graduated  index  plate,  enabling 
the  observer  to  tell  more  accurately  when  the  beam  is  level;  it  also  limits  the  motion  of  the 
beam,  preventing  the  weights  from  being  scattered  by  a  sudden  swing.  Constructed  of  brass 
with  8  inch  beam  and  3  inch  horn  pans  supported  by  cords.  Weighs  accurately  to  1  centigram 
3.00 

572.  BALANCE,  Laboratory,  designed  for  those  desiring  a  more  sensitive  and  convenient  form  of 
balance  than  the  Harvard  Trip  scale. 

Capacity,  2  kilos. 

Sensibility.     Loads  up  to  2  kilos  can  be  readily  weighed  within  0.05  grams.     Sensibility  on  light 

loads  is  much  greater. 
Beam,  open  construction. 

divisions,  each  division 
Damping  Device,  positive 


A  rider  upon  beam  indicates  all  amounts  up  to  10  grams  by  1/10  gram 
being  2.54  mm  long,  making  small  weights  unnecessary. 


in  action,  brings  balance  quickly  to  rest. 

Bearings,  of  high  grade  steel,  carefully  polished 
and  adjusted. 

Hangers  of  improved  design,  eliminating  fric- 
tion and  wear. 

Pan  Arrest.  The  base  serves  as  an  arrest,  en- 
abling operator  to  move  balance  safely  while 
loaded. 

Leveling  Screws  are  supplied,  insuring  greater 
sensitiveness. 

Plumb  Bob,  not  shown  in  illustration,  makes 
accurate  leveling  a  simple  matter. 

Adjusting  Screw  protected  within  open  work  of 
beam. 

Dimensions.  Length  of  beam  between  knife 
edges,  32  cm.  Length  of  graduated  part, 
25.4  cm. 

Pans,  of  aluminum  14  cm  in  diameter.  Height 
of  balance,  45  cm.  Width  of  bows,  15  cm; 
height  of  bows,  35  cm.  Pans,  bows  and 
stirrups  accurately  balanced,  making  them 
interchangeable. 

An  Adjustable  Shelf  for  specific  gravity  work 
is  included. 


No.  572. 


Price 


15.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


49 


No.  578. 


No.  576. 


574.  BALANCE,  Laboratory,  similar  to  No.  572,  but  more  sensitive  and  of  better  finish  and  construc- 
tion. Mounted  on  polished,  mahogany  finished  base  provided  with  leveling  screws.  Sliding 
rider  on  graduated  beam  indicates  weight  up  to  10  grams  in  1/10  gram  divisions.  Prismatic 
steel  bearings  and  supports.  An  eccentric  movement  operated  by  knurled  head  raises  beam 
from  beam  arrest.  Provided  with  shelf  for  specific  gravity  work.  Made  of  brass  finely  finished; 
pans  of  aluminum.  Plumb  bob  and  protected  adjusting  screw  as  in  No.  572.  Height  of  bal- 
ance, 48  cm;  diameter  of  pans,  14  cm;  length  of  beam  (between  knife  edges),  32  cm.  Capacity, 
2,000  grams.  Sensibility  with  full  load,  30  milligrams  or  less,  which  is  increased  with  smaller 
loads i $27.50 

576.  BALANCE,  Lecture  Table,  constructed  entirely  of  magnalium  and  aluminum,  making  it  very 
light  and  portable.  Beam  of  magnalium  14  inches  long.  Knife  edges  and  bearings  of  agate, 
relieved  from  contact  when  beam  is  at  rest.  Provided  with  two  pointers,  permitting  readings 
to  be  made  from  front  or  rear.  Scale  on  index  plate  6  inches  long,  with  divisions  %  inch 
apart,  easily  read  30  feet  away.  Base  of  balance  20  inches  long  and  12  inches  wide,  with 
handles.  Height  over  all,  24  inches;  diameter  of  pans,  6  inches.  Pointer  deviates  2  inches  for 
150  milligram  load 150.00 

578.  BALANCE,  Moisture  Scale,  for  determining  percentage  of  moisture  or  sulphur  in  ores,  etc.  Pro- 
vided with  6  inch  iron  plates,  with  tin  scoop  15  x  8  inches  and  counterpoise.  Beam  graduated 
on  upper  side  to  1  pound  by  *4  ounce  and  on  lower  side  from  0  to  100%  of  one  pound.  Capacity, 
4  pounds;  sensibility,  1/16  ounce.  Complete  with  set  of  weights  from  2  Ibs.  down 13.00 


50 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  584. 


No.  588 


No.  580. 


580. 


584. 


586. 


588. 


BALANCE,  Platform  Scale,  with  patented  combination  beam.  Graduated  on  one  side  of  beam 
to  500  pounds  by  V2  pound  divisions;  on  other  side  to  175  kilos  by  100  gram  divisions.  No 
loose  weights,  as  full  capacity  is  on  the  beam.  Mounted  on  wheels 70.00 

BALANCE,  Platform,  Express  Package  Scale,  with  platform  10%  x  12  inches,  with  double  beam, 
lower  bar  graduated  to  50  pounds  by  5  pounds,  upper  to  5  pounds  by  1  ounce.  Finished  in  ma- 
roon, ornamented  24.00 

BALANCE,  Platform,  Express  Package  Scale,  as  above,  but  with  lower  beam  graduated  to  20 

kilograms  by  1  kilo,  upper  to  2  kilograms  by  20  grams 24.00 

(Note:  This  graduation  is  made  to  order  only,  and  we  can  not  promise  immediate  delivery.) 

BALANCE,  Platform,  Automatic  Scoop.  In  the  center  of  the  platform  is  a  depression  into  which 
the  base  of  the  scoop  fits,  automatically  engaging  the  counterpoise,  thus  eliminating  errors 
through  removal  of  the  scoop.  Provided  with  reinforced,  seamless  brass  scoop,  21%  x  10x6 
inches,  all  brass  parts  heavily  nickeled.  Finished  in  maroon.  Platform  15  x  12  inches.  Double 
beam  of  brass,  lower  bar  graduated  to  50  pounds  by  %  pound,  upper  bar  to  15  pounds  by  1 
ounce.  Rest  of  250  pounds  capacity  can  be  obtained  through  counterpoise  weights  on  weight 
hanger.  An  excellent  balance  for  use  in  sampling  coal,  ore,  cement,  etc 52.00 

BALANCE,  Platform,  Automatic  Scoop,  as  above  but  with  lower  bar  graduated  to  20  kilograms 

by  2/10  kilos,  upper  to  6  kilograms  by  20  grams 52.00 

(Note:  This  graduation  is  made  to  order  only,  and  we  can  not  promise  immediate  delivery.) 
592.  BALANCE,  Platform,  same  as  No.  588,  but  with  solid  platform  without  scoop  and  scoop  balance 

attachment 44.00 

594.  BALANCE,  Platform,  same  as  No.  590,  but  with  solid  platform  without  scoop  and  scoop  balance 
attachment 44.00 

BALANCE,  Platform,  for  obtaining  personal  height  and  weight.  Constructed  of  metal  through- 
out with  tall  pillar,  placing  beam  on  level  with  eye.  Finished  in  white  enamel  with  nickeled 
beam,  graduated  to  5  pounds  by  1  ounce.  Rest  of  250  pounds  capacity  on  the  counterpoise 
weights.  Platform  10%  x  14%  inches,  with  measuring  rod.  Complete  with  weights ....  48.00 


590. 


596. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


51 


No.  604. 


No.  606. 


No.  608. 


No.  610. 


604.  BALANCE,  Prescription  (Army),  nickel  plated,  mounted  on  a  box  with  drawer  with  6  inch  beam 
lifted  by  a  lever.  Capacity,  50  grams $4.00 

606.  BALANCE,  Solution,  provided  with  two  weighing  beams  and  sliding  poises.  One  beam  is  divided 
into  one  hundred  parts,  each  part  representing  one  gram;  the  other  beam  is  divided  into  ten 
parts,  each  part  representing  one  hundred  grams.  A  bar  with  sliding  poise  is  placed  under  the 
weighing  beams  for  the  purpose  of  balancing  the  empty  bottle  or  container,  which  is  quickly 
done  by  sliding  the  poise  along  the  bar  until  a  correct  balance  is  secured.  This  balance  will 
be  found  indispensable  in  soil  study  where  quantities  up  to  20  kilos  need  to  be  weighed  with 
accuracy.  Sensibility,  1  gram 32.50 

608.  BALANCE,  Specific  Gravity,  Hydrostatic.  Excellent  for  work  in  specific  gravity  experiments. 
Prismatic  steel  knife  edges,  adjustable  rod  supporting  beam,  and  beam  arrest.  Beam  can  be  so 
elevated  that  hook  under  short  pan  is  30  centimeters  from  the  table.  Mounted  on  neatly 
japanned  iron  base.  Length  of  beam,  25  centimeters;  diameter  of  pans,  10  centimeters;  ca- 
pacity, 200  grams;  sensibility,  1  centigram 6.00 

610.  BALANCE,  Specific  Gravity,  Westphal  Type.     This  is  a  handy  and  improved  form  for  exact  and 

quick  determination  of  the  density  of  liquids.  In  polished  hardwood  box,  with  Eeimann's  ther- 
mometer sinker  having  displacement  of  5  cc.  This  balance  overcomes  all  trouble  with  incorrect 
hydrometers  and  forms  an  easy  means  for  standardizing  hydrometers.  Complete  with  5,  50,  500 
milligram,  and  5  gram  riders,  and  15  gram  counterpoise 25.00" 

611.  THERMOMETER,  Extra,  reading  from  10°  to  30°C.,  with  displacement  of  5  cc 6.00 

612.  WEIGHTS,  Extra,  for  Xo.  610  Balance,  per  set,  without  counterpoise 3.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


616.  BALANCE,  Specific  Gravity,  Jolly's  Spiral  Spring,  improved  design.  The 
upright  is  nickel-plated,  100  centimeters  long,  graduated  in  millimeters, 
and  supported  by  a  heavy  japanned  iron  tripod  base,  fitted  with  leveling 
screws.  The  support  for  the  spring  is  adjustable  and  can  be  inverted  for 
light  loads  or  heavier  springs.  As  the  upright  rod  is  graduated  for  its  full 
length  this  spring  support  may  be  set  at  any  given  point,  and  may  be 
moved  during  an  experiment  provided  the  amount  of  its  motion  is  added 
to  or  subtracted  from  the  stretch  of  the  spring.  The  indicator  at  the  end 
of  the  spring  may  thus  be  kept  at  a  convenient  height  during  an  entire 
experiment. 

Attached  to  the  sliding  index  is  a  small  mirror  with  a  horizontal  line  etched 
upon  it,  and  a  device  for  limiting  the  motion  of  the  spring.  The  indicator 
attached  to  the  end  of  the  spring  is  a  small  metal  disc  which  may  be  set 
very  accurately  in  line  with  its  own  image  and  the  etched  line  on  the 
glass.  The  position  of  the  index  is  then  read  directly  from  the  scale.  This 
method  of  reading  embodies  all  the  advantages  of  the  mirror  scale,  and 
at  the  same  time  does  away  with  the  necessity  of  reading  the  position  of 
the  index  while  attempting  to  hold  three  objects  in  line  with  the  eye. 

The  platform  for  holding  the  beaker  of  water  or  other  liquid  is  of  oxidized 
brass  and  slides  on  the  upright,  to  which  it  can  be  clamped  in  any  posi- 
tion. For  experiments  in  cohesion  or  surface  tension  a  device  is  provided 
by  which  the  platform  may  be  fastened  to  and  moved  with  the  sliding 
index.  The  lower  pan  is  of  glass  suspended  by  fine 
platinum  wires.  The  springs  are  of  the  best  steel, 
conical  in  form,  especially  made  for  Jolly  Balance 
work.  Two  springs,  one  high  and  one  low  tension, 
are  supplied  with  the  balance $17.50 


No.  616. 


018.  BALANCE,  Specific  Gravity,  Jolly's  Spiral  Spring,  made  entirely  of  metal 
and  nicely  finished  throughout.  The  upright  is  a  nickel  plated  rod  100  cm 
long  supported  by  a  japanned  iron  tripod  base.  The  platform  is  of  oxidized 
brass  which  slides  along  the  rod  and  can  be  clamped  in  any  position.  The 
spring  support  is  also  adjustable  and  can  be  inverted  for  light  loads  or 
heavier  springs,  allowing  a  larger  range.  An  adjustable  mirror  scale  65  cm 
long,  graduated  in  millimeters,  is  provided.  The  pans  are  of  aluminum. 
Furnished  complete  with  spring  No.  628 5.50 

620.  SCALE  PAN,  for  Jolly's  Spiral  Spring  Balance.  Lower  pan  of  aluminum, 
with  copper  wires .25 

622.  SCALE  PAN,  for  Jolly's  Spiral  Spring  Balance.  Upper  pan  of  aluminum, 
with  copper  wires .25 

624.  SCALE  PAN,  for  Jolly's  Spiral  Spring  Balance.  Lower  pan  of  glass,  with 
platinum  wires  .75 


No.  618. 


626.    SPRING  for  Jolly's  Balance,  light. . 
628.    SPUING  for  Jolly's  Balance,  heavy. 


.45 
.45 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


53 


630.  BALANCE,  Spring,  English,  cylindrical  pocket  form,  arranged 
to  obviate  the  zero  error.  Reads  to  15  Ibs.  in  4  oz.  divisions. 
Spring  elongates  2^4  inches $0.70 

632.   BALANCE,  Spring,  English,  25  pounds  in  8  ounce 
divisions.     Spring  elongates  1^  inches.  .          .20 

634.   BALANCE,  Spring,  English.  50  Ibs.  in  1  Ib.  di- 
visions.    Spring  elongates  1%  inches. . . .         .36 

636.  BALANCE,  Spring,  English 
and  Metric,  with  flat  b.ick 
and  broad  pointer,  for  either 
perpendicular  or  horizontal 
reading.  Reads  to  8  oz.  in  % 
oz.  divisions,  and  250  grams 
in  10  gram  divisions.  Spring 
elongates  2>4  inches. .  1.10 

638.  BALANCE,  Spring,  English 
and  Metric,  with  flat  back 
and  broad  pointer,  for  either 
perpendicular  or  horizontal 
reading.  Reads  to  64  oz.  in 
1  oz.  divisions,  and  2,000 

§rams  in  25  gram  divisions, 
priug  elongates  2*4   inches. 
60 

640.  BALANCE,  Spring,  English 
and  Metric.  Capacity,  IS  oz. 
in  1/5  oz.  divisions  and  500 
grams  in  10  gram  divisions. 
Has  flat  back  and  sharp 
pointer,  and  is  provided  with 
several  divisions  above  the 
zero  to  compensate  for  the 
sharp  pointer  in  horizontal 

readings.      Spring    elongates    No.  630.   No.  636.          No.  638. 
to  4  inches..  3.30 


No.  640. 


No.  644. 


642.  BALANCE,  Spring,  English  and  Metric,  with  flat  back.  Beads  to  30  Ibs.  in  %  Ib.  divisions,  and 
15  kilos  in  100  gram  divisions.  Spring  elongates  5^  inches 2.30 

644.  BALANCE,  Spring,  English  and  Metric,  in  iron  case  with  sliding  index  recorder.  Especially 
designed  for  experiments  in  tensile  strength,  the  indicator  remaining  at  the  breaking  strain, 
instead  of  going  back  to  zero  when  the  strain  is  released,  as  in  the  ease  of  the  regular  spring 
balances.  Reads  to  30  Ibs.  in  *4  Ib.  divisions,  and  15  kilos  in  100  gram  divisions.  Spring 
elongates  5^  inches 8.00 

646.  BALANCE,  Stoddard  Labora- 
tory, designed  by  Prof.  J.  T. 
Stoddard,  Department  of 
Chemistry,  Smith  College, 
Northampton,  Mass.  Capacity 
121  grams;  sensibility,  less 
than  1  eg.  Especially  suited 
for  use  in  Elementary  Chem- 
istry, sine*  it  is  much  more 
accurate  and  easy  to  handle 
than  tfce  Horn  Pan  Balance, 
and  more  durable  than  the 
cheap  equal  arm  Chemical 
Balance. 

Five  riders  are  furnished, 
which  weigh  10  g.,  1  g.,  1  g., 
0.1  g.,  and  0.01  g.,  respective- 
ly, when  placed  on  the  first 

notch  on  the  beam.  These  values  multiplied  by  the  number  of  the  notch  give  the  weight  re- 
quired. For  example,  the  balance  in  the  illustration  is  in  equilibrium  with  a  mass  of  37.7  grams 
in  the  pan.  When  not  in  use  the  riders  are  kept  in  a  covered  receptacle  permanently  attached 
to  the  base  of  the  balance 7-50 


No.  646. 


54 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  648. 


No.  652. 


No.  650. 


No.  654. 


C48.  BALANCE,  Trip  Scale,  Cenco  Agate  Bearing,  Harvard  design.  In  this  trip  scale  we  have  done 
away  with  the  rough  cast  and  forged  iron  parts  used  for  years  in  the  Harvard  Trip  Scale,  and 
employ  parts  of  brass  and  steel  neatly  formed  by  elaborate  tools  and  machinery.  This  makes 
possible  a  degree  of  perfection  never  before  attained  in  assembling  this  style  of  balance.  We 
have  discontinued  altogether  the  cheap  imported  balances  of  the  Robervahl  type,  as  we  believe 
the  superior  accuracy  and  durability  of  the  Cenco  Trip  far  outweighs  the  slight  difference  in 
price.  The  BEARINGS  consist  of  HARDENED  STEEL  PRISMS  resting  on  SIX  AGATE 
SHELVES  of  large  dimensions.  This  construction  adds  very  materially  both  to  the  initial  sen- 
sibility of  the  scale  and  to  its  ability  to  retain  its  sensibility  after  long  continued  use.  The 
graduated  beam  has  a  range  of  10  grams  in  1/10  gram  divisions.  The  capacity  of  the  scale  is 
2000  grams.  Sensibility  is  guaranteed  to  be  1/10  gram.  Actual  tests  show  a  much  greater 
sensibility. 

A  very  convenient  feature  of  our  latest  design  is  a  hook  placed  directly  below  the  knife  edges 
of  each  scale  pan,  from  which  objects  may  easily  be  suspended  for  specific  gravity  work.  A 
set  screw  is  also  provided  by  means  of  which  the  balance  may  be  clamped  to  a  13  mm  support 
rod,  and  so  elevated  above  the  table  top $7.50 

650.  SUPPORT,  for  No.  648  Trip  Scale.  Consists  of  a  table  clamp  of  special  design  (No.  F197),  and 
a  No.  F133  Support  Rod,  20  cm  long.  This  forms  a  most  convenient  means  of  supporting  No.  648 
Trip  Scale  for  specific  gravity  work,  as  the  scale  is  provided  with  a  set  screw  for  clamping  to  a 
support  rod,  and  with  specially  designed  hooks  for  supporting  specimens  which  are  to  be  weighed 
under  water  1.25 

652.  BALANCE,  Dispensing  and  Solution  Scale,  with  Agate  Bearings  as  described  under  No.  648.  This 
balance  will  be  found  ideal  for  laboratory  and  pharmaceutical  work.  The  pans  are  of  heavy 
nickeled  brass,  15  cm  in  diameter.  The  graduated  beam  has  a  range  of  10  grams  in  1/10  gram 
divisions,  and  brass  weights  from  10  grams  to  100  grams  are  supplied,  conveniently  fitted  into  a 
projecting  holder.  Capacity,  2,000  grams.  Sensibility  is  guaranteed  to  be  1/10  gram;  actual 
tests  show  a  much  greater  sensibility 10.00 

654.  BALANCE,  Grain  Test.  Consists  of  No.  648  Cenco  Agate  Bearing  Trip  Scale  with  the  addition 
of  a  funnel  scoop  and  counterpoise,  accurately  adjusted 10.00 

656.    FUNNEL  SCOOP  AND  COUNTERPOISE,  only,  of  No.  654 2.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


55 


No.  653. 


No.  700. 
No.  702. 
No.  706. 


658.  BALANCE,  Triple  Beam,  Cenco,  for  physical  and  chemical  laboratories.  The  three  beams  are 
placed  in  the  same  horizontal  plane,  thus  conforming  to  scientific  principles  involved,  which  is 
not  true  of  other  styles  of  Triple  Beam  Balances.  Weighings  are  obtained  by  movement  of  the 
riders  along  the  beams.  These  riders  are  easily  handled  and  quickly  placed  in  the  notches,  but 
cannot  be  removed  from  the  beams.  An  adjustable  support  is  .provided  for  a  jar  or  other 
receptacle  for  experiments  in  specific  gravity.  Provided  with  stable  base  neatly  japanned,  and 
with  sensitive  spirit  level  and  leveling  screw.  Balance  neatly  finished  in  nickel  plate  and 
japan.  Capacity  of  middle  beam,  100  grams  by  10  gram  divisions;  back  beam  10  grams  by  1 
gram  divisions;  front  beam,  100  centigrams  by  1  centigram  divisions.  Total  capacity,  111 
grams;  sensibility,  with  or  without  full  load,  guaranteed  to  1  centigram.  Actual  tests,  how- 
ever, give  a  sensibility  of  from  4  to  8  milligrams.  Diameter  of  pan,  9.5cm;  width  of  bow, 
10.5cm;  height  of  bow,  22cm.  Features  easily  recognized  are:  rapid  weighing,  constant  sensi- 
bility, accuracy,  freedom  from  loss  of  weights,  no  interference  or  breaking  of  weights. . .  $17.50 

660.    WEIGHT,  Extra,  for  use  with  No.  658,  for  weighing   over   111   grams,  but    not   to     exceed 
grams.   Weight  is  placed  on  the  100  gram  notch  of  the  middle  beam.     Sold  only  at  the 


time  with  No.  658. 


201 
same 
1.75 


WEIGHTS,  ANALYTICAL 

700.  WEIGHTS,  Analytical,  Gold  Plated,  Highest  Accuracy,  adjusted  to  meet  the  requirements  of  the 
United  States  Bureau  of  Standards,  Class  M.  Useful  for  checking  accuracy  of  other  weights. 
Gram  weights  made  of  Tobin  bronze,  one  piece  heavily  gold  plated;  fractions  of  gram  of  plat- 
inum with  3 — 10  mg  riders.  In  polished  mahogany  velvet  lined  box  with  hinged  covers.  Fur- 
nished with  United  States  Bureau  of  Standards  Certificate. 

No.  A  B 

Size  1  mg  to,  grams 50  100 

Per   set., 59.50  64.00 

702.  WEIGHTS,  Analytical,  adjusted  within  the  tolerance  of  the  United  States  Bureau  of  Standards 
for  analytical  work.  All  gram  pieces  are  of  brass,  heavily  gold  plated.  The  fractionals  from 
500  mg  to  50  mg  are  of  Bhotanium  A  and  from  20  mg  to  1  mg  of  aluminum  with  3 — 10  mg  riders. 
In  polished  mahogany  velvet  lined  box,  with  hinged  cover,  and  with  forceps.  Each  weight 
fitted  in  separate  compartment. 

No.  A  B  C  D  E  F 

Size  1  mg  to,  grams 20  50  100  200          500          1000 

Per    set 23.00        25.00          28.00          37.00        44.00         53.00 

704.  WEIGHTS,  Analytical,  same  as  No.  702,  but  furnished  with  United  States  Bureau  of  Standards 
Certificate. 

No.                                                                                                            A  B 

Size  1  mg  to,  grams 50  100 

Per   set 40.50  43.75 

7"0.    WEIGHTS,  Analytical,  same  quality  as  No.  702,  but  carefully  lacquered  instead  of  gold  plated. 
No.  A  B "  C  D  E  F 

Size  1  mg  to,  grams 20  50  100  200  500  1000 

Per   set 21.00        22.00         24.00         30.00       36.00        43.00 


50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  708. 


No.  716. 


No.  718. 


No.  720. 


No.  710. 


708.  WEIGHTS,  Analytical,  Precision,  for  use  with  Nos.  450  and  452  Chain  Balances.  Of  lacquered 
brass,  with  fractional  weights  from  5!)0  mg  to  50  mg  of  platinum.  Adjusted  to  within  the 
tolerance  of  Class  8  Bureau  of  Standards.  In  polished  velvet  lined  mahogany  box.  Complete 
with  forceps. 

No.  ABC 

Size  50  mg  to,  grams 20  50  100 

Per    set $22.00  23.00  26.00 

710.  WEIGHTS,  Analytical,  Fractions  of  Grams,  of  same  quality  as  supplied  in  above  sets.  In  pol- 
ished wooden  box  with  slip  lid,  with  separate  compartment  for  each  weight.  1-2-5-10-20  mg 

pieces  of  aluminum;  50-100-200-500  mg  pieces  of  Rhotauium  A per  set     19.00 

7 '.2.    WEIGHTS,  Analytical,  Fractions  of  Grams,  same  as  No.  710,  but  priced  singly. 

/ Aluminum — ,  , —  — Rhotanium  A < 

Size,    mg 1  2  5  10  20  50  100  200  500         1000 

Each    60  .60  .60  .60          1.00          1.50          2.00          3.00          4.50          8.00 

WEIGHTS,   Analytical.     These  weights  are  the  same  quality  as  No.  706,  except  the  fractionals 
are  of  22-caret  solid  gold,  thus  reducing  the  price  due  to  the  excessive  cost  of  Rhotanium  fractionals. 

No.  A  B  C  D 

Size  1  mg  to,  grams 10  20  50  100 

714.  Per  set 14.00  15.50  18.00  21.00 

715.  Per  set  with  Bureau  of  Standards  Certificate          38.50  41.00 

716.  WEIGHTS,  Analytical,  Fractions  of  Grams,  of  22-carat  gold,  as  supplied  with  No.  714,  in  polished 

wooden  box  with  slip  lid,  with  separate  compartment  for  each  weight.  Weights  below  50  milli- 
grams are  of  aluminum 9.00 

717.  WEIGHTS,  Analytical,  Fractiors  of  Grams,  same  as  No.  716,  but  priced  singly.     • 

i Aluminum —  — ,        , — Gold —        > 

Size,  mg 1  2  5  10  20  50          100          200          500 

Each    '. . .     .45         .45         .45         .65         .65         .95         1.20         1.30         1.50 

718.  WEIGHTS,  Analytical,  designed  for  student  use,  accurately  adjusted.     Gram  pieces  of  solid  brass, 

polished  and  lacquered.  No  loose  balancing  material  used  as  all  adjustments  are  made  on 
knob  stem.  Fractionals  of  aluminum,  the  box  of  natural  mahogany  with  hinged  lid,  velvet 
lined,  with  separate  compartment  for  each  weight.  A  pair  of  brass  forceps  is  supplied. 

No A  B 

Size  1  mg  to,  grams 50  100 

Per    set 10.50  11.75 

719.  WEIGHTS,  Analytical,  same  grade  as  above  except  in  block  without  hinged  lid. 

No A  B 

Size,  1  mg  to,  grams 50  100 

Per   set 9.25  10.50 

720.  RIDERS,  Analytical,  of  aluminum,  very  carefully  adjusted. 

Size,   mg 12          10  6  5  3  2         1.2  1  .6  .5 

Each 35         .35         .35         .35         .55         .55         .55         .55         .55         .65 


CEXTKAL,  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


57 


No.  722. 


No.  736. 


No.  734. 


721.  WEIGHTS,  Assay  or  Button,  of  Platinum,  from  1  gram  to  1  milligram  with  two  riders;  guaran- 

teed accurate  to  0.01  mg.     Weights  from  20  mg  down  are  of  aluminum.     In  hardwood  box  ?24-00 

722.  WEIGHTS,  Assay  Ton,  of  hard  brass  polished  and  lacquered,  in  mahogany  box.     These  weights 

are  accurately  adjusted  to  a  standard  of  29.1666  grams  equals  one  Assay  Ton  which  therefore 
contains  as  many  milligrams  as  there  are  troy  ounces  in  an  avoirdupois  ton.  Hence  if  one  A.  T. 
of  ore  assays  one  milligram,  the  ore  runs  one  troy  ounce  to  the  ton. 

Xo.  ABC 

Size  1/20  A.  T.  to,  A.  T 124 

Per.  set $6.50  8.00  9.00 

724.    WEIGHTS,  Assay  Ton,  single  weights. 

Size,  assay  ton 1/20         1/10         2/10         5/10  1  2  4 

Each   . .  .  ." 1.00          1.00          1.00          1.20          2.30          2.60          3.25 

72G.    WEIGHTS,  Factor,  of  brass  lacquered,  for  the  rapid  analysis  of  iron  and  steel. 

A.  Carbon    Factor 2.7273  grams  Each     1.30 

B.  ii  Carbon  Factor 1.3636  grams  Each     1.30 

C.  %,   Silicon  Factor 1.1755  grams  Each     1.30 

D.  Phosphorus   Factor 1.63       grams  Each     1.30 

E.  1/10  Silicon  Factor 0.4702  grams  (platinum)    Each     7.00 

730.    WEIGHTS,  Normal   Sugar,  of  brass,  lacquered,  in  box. 

Xo.  A  B 

Set   of 2  3 

Consisting  of,  grams 13.024  13.024 

26.048  26.048 

52.096 

Per   set 5.20  .  6.50 

732.    WEIGHTS,  Normal  Sugar,  separate  weights. 

Size,    grams 13.024  26.043  52.096 

Each 2.00  2.00  2.00 

WEIGHTS  of  MEDIUM  GRADE  for  LABORATORY  and  TECHNICAL  WEIGHING 

734.  WEIGHTS,  Medium  Grade,  Metric,  gram  pieces  of  solid  brass,  flat  shape,  heavily  lacquered;  frac- 
tionals  of  German  silver;  in  polished  hardwood  box  with  hinged  cover,  with  forceps;  with  sep- 
arate compartment  for  each  weight;  fractionals  under  glass  cover. 

Xo A  B  C  D  E  F 

Size  1  mg  to,  grams 20  50  100  200  500  1000 

Per  set 4.50  5.50  7.00  9.00         12.00         15.00 

736.  WEIGHTS,  Medium  Grade,  Metric,  same  quality  as  No.  734,  but  in  polished  hardwood  block  in- 
stead of  box,  with  brass  forceps. 

No A  B  C  D  E  F 

Size  1  mg  to,  grams 20  50  100  200  500  1000 

Per  set 3.00  3.75  4.50  550          9.00          13.00 


58 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  742. 


No.  738. 


No.  740. 


No.  754. 


No.  758. 


738.    WEIGHTS,  Metric,  separate  weights,  same  quality  as  No.  734  and  736,  for  replacements. 

Size,  grams  .............       1  2  5  10          20          50        100       200        500       1000 

Each  ...................  $0.22        .25        .28         .33         .40         .50         .65       1.25       2.00        3.90 

740.    WEIGHTS,  Metric,  of  polished  brass,  flat  shape,  in  hardwood  block  with  hinged  cover,  suitable 
for  ordinary  laboratory  work.     Nos.  A-C  are  provided  with  receptacle  for  the  fractional  weights 
which  are  of  German  silver.     Without  forceps. 

No  ...................  A  B  C  D  E  F 

Size  ...................    lcg-20g         lcg-50g         Icg-lOOg         lg-200g         lg-500g          Ig-lOOOg 

Per  set  ................       2.25  2.75  3.35  4.50  7.00  10.00 

742.    WEIGHTS,  Metric,  of  brass,  same  as  No.  740,  but  in  hardwood  block.     Without  forceps. 

No  ....................         A  B  C  D  E  F 

Size  ...................   leg-20g         lcg-50g         Icg-lOOg         lg-200g         lg-500g  Ig-lOOOg 

Per  set  ................     $1.65  2.00  2.75  4.00  6.00  9.00 

744.    WEIGHTS,  Metric,  Brass,  same  as  Nos.  740  and  742,  separate  for  replacements  in  other  sets. 

Size,  grams  .............        1  2  5  10          20  50        100       200        500        1000 

Each  ....................  11         .14         .17         .20         .25         .40         .55        .95        1.80       3.35 

746.  WEIGHTS,  Metric,  .Fractional,  of  German  silver  and  aluminum.  Set  1  to  500  milligrams,  with 
duplicates  of  2,  20  and  200  milligram  pieces,  in  covered  hardwood  box  with  sliding  cover.  Each 
weight  in  a  separate  compartment;  with  brass  forceps  ...........................  per  set  1.65 

748.  WEIGHTS,  Metric,  Fractional,  of  German  silver  and  aluminum,  put  up  in  sets  of  1  mg  to  500  mg 
with  duplicates  of  2,  20  and  200  mg  pieces;  in  pasteboard  box  .................  per  set  .50 

750.    WEIGHTS,  Metric,  Fractional,  Single,  same  as  No.  748,  for  replacements  ............  Each        .05 

752.    WEIGHTS,  Avoirdupois,   of  nickel  silver,  from  1/128  to 
1/64,  1/32,  1/16,  %,  and  %  oz 

754.    WEIGHTS,  Avoirdupois,  of  brass,  in  hardwood  block,  carefully  adjusted. 

No  ...................................................  .  .  .  .         A  B  C 

Size  %  oz.  to,  Ibs  .........................................          124 

Per  set  ...................................................       5.00  6.50  9.45 

756.    WEIGHTS,  Avoirdupois,  same  as  No.  754,  single  for  replacements. 

Size,  ounces  ____       %  }4  %  1  2  4  8       Pounds  1 

Each  ...........  29         .37         .43         .51         .72         .86       1.00  1.45 


ounce,  consisting  of  one  each  1/128, 
Per  set      2.00 


2.30 


4 
3.90 


758.  WEIGHTS,  Decimal  Pound,  brass  in  block,  from  0.5  to  0.001  Ib.  with  duplicates  of  the  0.1,  0.01, 
and  triplicates  of  the  0.001  Ib.  weights.  Adds  up  to  make  1  pound.  Especially  valuable  in  test- 
ing laboratories  where  results  must  be  reported  in  English  units  .................  per  set  11.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


59 


37 


No.  764. 


No.  770. 


No.  774. 


No.  766. 


No.  768. 


760.  WEIGHTS.  Prescription,  according  to  the  United  States  Bureau  of  Standards  and  the  New  York 
Board  of  Pharmacy.  In  box  with  cover  from  4  drams  to  1/10  grain,  consisting  of  the  follow- 
ing individual  weights:  4,  2,  1,  %  drams;  2,  and  %  scruples;  10,  5,  2,  1,  5/10,  2/10,  and  1/10 
grains  .............  ........................................  .  ................  per  set  $6.00 


762.    WEIGHTS,  Prescription,  from  2  drams  to 
coin  shaped,  the  grain  weights  of  nickel 


grain,   the    dram    and    scruple    weights    of    brass, 

per  set         .80 


764.    WEIGHTS,  Troy,  brass,  in  hardwood  block,  adjusted    to    meet    requirements    of    the    Bureau    of 
Standards,  Tenth  Annual  Conference  on  Weights  and  Measures.     Weights  below  yt  ounce  fur- 
nished in  pennyweights  and  grains  unless  otherwise  specified. 

Xo  .....................................  A  B  C  D 

Size  %  grains  to,  ounces  .................  1  2  5  10 

Per  set  ................................         1.65  2.60  3.60  5.85 

766.    WEIGHTS,  Troy,  of  aluminum,  square,  from  %  grain  to  10  grains,  in  pasteboard  box.     Shape  is 
such  that  they  may  be  picked  up  readily  .......................................  per  set         .65 

768.    WEIGHTS,  Troy,  from  %  grain  to  5  grains  in  pasteboard    box.      Bent    from    aluminum    wire,    in 
shapes  convenient  to  handle  ...............  ....................................  per  set         .75 


WEIGHTS,  ORDINARY  GRADE,  FOR  COARSE  WEIGHING 


770.   WEIGHTS,  Avoirdupois,  Iron,  sealed,  in   nests. 

Xo 

Size  14  °z-  to,  Ibs 

Per  set  . 


A 
1 

2.30 


B 

o 

2.80 


C 

4 

4.00 


772.    WEIGHTS.  Avoirdupois.  Iron,  sealed,  same  quality  as  above,  single  for  replacements. 


Size,  ounces 
Each  .. 


.35 


1 
.35 


.35 


4 
.35 


774.    WEIGHTS,  Avoirdupois,  of  iron  with  ring  handle. 


Size,  pounds 
Each  . 


8 
.70 


1 
.55 


Pounds 


2 
.85 


1 
70 


1.00 


4 
1.70 


4 
1.40 


776.    WEIGHTS.  Avoirdupois,  safety  valve. 

Size,  pounds  

Each  . 


10 
2.75 


4 
1.50 


D 

8 
6.00 


8 
3.00 


14 
3.35 


8 
2.50 


60 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  788. 


No.  792. 


No.  800-802. 


778.  WEIGHTS,  Metric,  Universal.  These  weights  are  of  brass, 
finely  finished,  and  are  of  a  high  degree  of  accuracy. 
They  are  provided  with  a  hook  at  the  top  and  an  eye 
in  the  bottom,  which  is  concave  so  that  the  weights  can 
be  stood  upright  on  a  platform  balance.  This  is  a  dis- 
tinctly high  grade  set  of  weights  and  will  be  found  of 
great  value  in  physical  laboratory  experiments,  as  well 
as  for  general  weighing.  The  set  consists  of  nine  weights 
ranging  from  10  grams  to  1  kilo,  with  duplicates  of  the 
20  and  200  gram  pieces.  Complete  in  finely  finished  hard- 
wood block per  set  $6.00 

780.    WEIGHTS,  separate,  same  as  No.  778. 

Size,    grams 10       20       50     100     200     500     1000 

Each    25      .38      .50      .55      .65      .90     1.35 

782.  WEIGHTS,  Metric,  Universal.  These  weights  are  made 
of  cast  iron,  neatly  japanned,  with  the  denomination  in 
raised  figures.  Of  same  general  nature  as  No.  778,  but 
much  less  finely  finished  and  accurate.  The  set  comprises 
nine  weigh!  s  ranging  from  10  grams  to  1  kilo,  with 
duplicates  of  the  20  and  200  gram  pieces. .  .per  s«t  3.35 

784.  BLOCK  of  hardwood,  with  holes  to  fit  No.  782  weights. 
60 

786.    WEIGHTS,  separate,  same  as  No.  782. 

Size,  grams.    10      20      50     100     200     500     1000     2000 
Each   13     .22     .25     .28      .35      .50       .90       1.45 

788.  WEIGHTS,  Metric,  Iron,  in  nests,  carefully  adjusted.  Sets 
have  duplicates  of  20,  200  and  2000  grams.  The  10  kilo 
weight  supplied  with  handle. 

No A  B  C  D 

No. 782.                                   Size  5  grams  to,  kilos..        1  2  5  10 

Per  set 2.25         3.35         7.25       12.25 

790.    WEIGHTS,  Metric,  Iron,  Single,  same  as  in  No.  788,  for  replacements. 

Size    grams  5         10        20        50      100      200      500     Kilos. 

Each  . ' 13       .13       .18       .20      .22       .27       .45 

792.  WEIGHTS,  Metric,  Iron,  Slotted,  with  holder.  Set  consists  of  one  500,  five  100,  one  50,  two  20 
and  one  10  gram  weights.  These  weights  will  fi  No.  798  Weight  Hanger  listed  below. .  .per  set  3.35 

794.  WEIGHTS,  Metric,  Iron,  Single.  More  accurate  and  of  better  finish  than  No.  792,  with  slot  to  fit 
No.  796  Holder  and  No.  798  Hanger.  Specially  designed  for  use  in  Physics  experiments  with 
simple  machines,  forces,  etc. 

Size,  grams 10  20  50  100 

Each  " 22  .28  .33  .45 

796.    WEIGHT  HOLDER,  only,  of  No.  792.     Useful  for  holding  No.  794  weights 

798.    WEIGHT  HANGER,  for  No.  794,  weight  50  grams,  capacity,  1500  grams 

800.    WEIGHTS,  Metric,  Iron,  Slotted,  for  use  with  hanger  No.  802. 

Size,  kilos %  1  '2 

Each 45  .65  1.10 

802.  WEIGHT  HANGER,  for  use  with  No.  800  Weights,  of  iron  with  hook;  weight,  1  kilo;  capacity, 
20  kilos  .  75 


No.  778. 


1 
.65 


1.10       2.75 


10 
5.00 


500 
.65 

.55 
.50 

5 
2.75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


61 


No.  812. 


No.  822. 


No.  820. 


No.  826. 


BALANCE  ACCESSORIES 

810.  BALANCE  BRACKET  or  support,  with  drawer  and  key,  for  attachment  to  wall  where  it  will  be 
out  of  the  way  and  less  exposed  to  vibrations.  Size  of  top  surface,  60  x  35  cm,  with  raised 
edge  $9.00 

812.  BALANCE  COVER,  of  good  quality  rubber  cloth.  A  very  convenient  protection  to  balances. 
Made  to  order  to  fit  any  balance.  When  ordering,  please  give  extreme  outside  dimensions  of 
balance  case.  Price,  according  to  size,  from 2.00  to  3.50 

814.  BALANCE  DESICCATOR,  triangular  in  shape  to  fit  in  corner  of  balance  case.  Of  glass,  2  inches 
on  a  side,  1V&  inches  high 1.00 

816.    BALANCE  LEVEL,  circular  brass  frame,  spirit  filled;  diameter  25  mm 4.00 

818.    BALANCE  PANS  of  horn,   75  mm  in   diameter per  pair         .25 

820.  BALANCE  READING  GLASS  or  magnifier,  to  place  before  indicating  scale  to  facilitate  rapid 
readings ;  on  adjustable  support 5.50 

822.    BALANCE  RESTS,  glass,  to  place  under  the  leveling  screws  of  balances each         .10 

824.    BALANCE  WATCH  GLASSES,     counterpoised,  accurately  adjusted  for  analytical  work. 

Diameter,  mm 50  62  75 

Per  pair 90  1.00  1.25 

826.  BALANCE  WEIGHING  SCOOPS,  of  aluminum,  with  lip  and  counterpoise.  Accurately  adjusted. 
Size  B  holds  about  12  gms  of  wheat  flour,  size  C  about  50  gins. 

No.  ABC 

Capacity  about,  cc 10  30  125 

Each  2.25  2.50  4.00 


62 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  828. 


No.  830. 


No.  838. 


NO.  836. 


No.  840. 


No.  842. 


828.    BALANCE  WEIGHING  SCOOP,  of  glass,  flat  bottom  with  spout. 

No.  A  B 

Length,  ram 67  87 

Each    $1.00  1.20 

830.    BALANCE  WEIGHING  SCOOP,  of  German  silver,  with  long  spout  and  with  counterpoise..       4.25 
832.    BALANCE  WEIGHING  SCOOP,  same  as  above  with  short  spout 4.25 

834.  BALANCE  WEIGHING  SCOOP,  of  pure  nickel,  with  spout  and  counterpoise,  accurately  adjusted. 

Diameter,  65  mm.    Length  over  all,  95  mm 3.00 

835.  BALANCE  WEIGHING  SCOOP,  Cope,  for  int.'oducing  a  weighed  sample  directly  into  a  long  neck 

flask.  The  scoop  is  made  of  aluminum  and  has  a  cylindrical  extension  and  lock  pin  by  which  a 
long  handle  is  attached.  Complete  with  scoop  and  brass  and  wooden  handle  (See  Technical  Paper 
160  of  the  United  States  Bureau  of  Mines) 2.00 

836.  BALANCE  WEIGHING  TUBE  SUPPORT,    nickel-plated,  for  horizontal  or  vertical  use...        2.00 

838.    FORCEPS,  for  use  with  sets  of  weights;  brass  with  curved  points;  ivory  tipped,  heavily  lacquered 
1.50 

840.    FORCEPS,  of  brass  with  curved  tips 25 

842.    WEIGHT  BLOCK,  of  polished  wood,  with  sliding  cover,  empty,  with  separate  compartments  for 
holding  fractional  weights  No.  712  and  748.     Convenient  for  placing  in  balance  case 50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


63 


B       No.  854. 


No.  856. 


BALLOONS.  Collodion,  for  hydrogen. 

Capacity,   cc ". 250         500        1000 

Each    .". $0.45        .60          .85 

S54.     BALLOONS,  Glass,  very  thin  for  weighing  gases.     Capacity,  about  250  ec. 

Si  yle   A  B  C  D 

Each    1.10        2.25        2.00        3.90 

85G.     BALLOON,  Glass,  Dumas  Type,  for  determining  the  specific  gravity  of  vapors.     Of  very  thin 
blown  glass.     Capacity,  about  200  cc 35 

858.     BALLOON,  Rubber,  pure  gum,  diameter  about  5  cm .06 

860.     BALLOON,  Rubber,  pure  gum,  diameter  about  15  cm 60 

BAROMETERS 


No.  876. 


No.  880. 


876. 


880 


BAROMETER,  Aneroid.  Sea  Level  Reading  Type,  with  rearranged  Weather  Harks.  This  instru- 
ment is  arranged  in  such  a  manner  that  it  is  suitable  for  use  in  any  location  from  sea  level  to 
3,500  feet  elevation.  The  adjustment  is  very  simple  and  no  derangement  of  the  working  parts 
is  necessary.  Once  adjusted  for  a  given  location  by  the  observer,  no  further  adjustment  is  re- 
quired. A  list  showing  altitudes  of  Meteorological  Stations  in  the  United  States  is  furnished 
with  each  barometer,  and  also  a  simple  weather  forecast  card. 

To  adjust  the  barometer  for  altitude  for  a  given  city,  town  or  location,  turn  the  brass  plate  set 
in  the  back  of  the  case  (this  is  easily  done  with  the  fingers)  until  the  number  of  feet  corres- 
ponding to  the  elevation  of  the  city  or  town  is  opposite  the  arrow.  The  hand  will  then  point 
to  the  proper  weather  mark  and  the  reading  will  be  the  same  as  that  of  the  U.  8.  Weather 
Bureau,  which  is  Sea  Level  Reading. 

Spun  brass  case,  porcelain  dial,  5  inches  in  diameter;  adjustable  stationary  hand  for  marking  the 
last  position  of  the  movable  hand 12.00 

BAROMETER,  Aneroid.  Same  as  No.  876,  but  with  metal  silvered  dial  and  first  quality  com- 
pensated movement  18.00 

BAROMETER,  Aneroid,  as  adopted  by  the  United  States  Xavy.  A  brass  case  barometer  of  extra 
quality,  with  specially  finished  movement  compensated  for  temperature,  and  silvered  open 
metal  dial  graduated  to  0.02  inches.  For  altitudes  up  to  3,500  feet.  Without  altitude  scale. 
The  best  barometer  of  this  stvle  on  the  market 18.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  881. 

881.  BAROMETER,    Aneroid.     Brass    case,    5    inches   in   diameter;    open 

porcelain  dial;  visible  works.     Graduated  to  0.02  inches....   $11.00 

882.  BAROMETER,   Aneroid,   4-inch   card   dial,   open   face,   nickel-plated 

case.     Graduations  in  both  English  and  metric  systems.     For  alti- 
tudes up  to  3,000  feet.     Without  altitude  scale 6.00 

890A.  BAROMETER,  Mercurial,  Cenco  Improved,  Fortin  Principle.  Has 
straight  glass  tube  of  heavy  wall  and  uniform  bore  mounted  in  a 
hexagonal  brass  protecting  case,  and  is  provided  with  a  screw  ad- 
justment for  changing  the  level  of  the  mercury  in  the  cistern.  The 
scales  are  readable  by  means  of  a  vernier  to  1/10  mm  and  1/200 
inch.  The  lowest  possible  reading  is  23  inches  (63.5  cm),  so  that 
the  barometer  is  not  satisfactory  for  altitudes  above  4,000  feet. 
(See  No.  891A  for  a  high  altitude  barometer.)  Complete  with 
thermometer  having  both  a  Centigrade  and  Fahrenheit  scale .  25.00 

891A.  BAROMETER,  Mercurial,  Cenco.  Same  as  No.  890A,  but  with  a  scale 
reading  down  to  20  inches.  For  use  in  altitudes  up  to  10,000 
feet  27.50 

894.     BAROMETER,  Standard  Mercurial,  United  Statss  Weather  Bureau 
Type,  Fortin  Principle.     This  barometer  is  of  the  highest  type  of 
No.  890A.  excellence,    indorsed    by    the  United   States   Weather  Bureau  and 

fully  warranted  by  the  manufacturer.  The  mercury  tube 
is  inclosed  in  a  brass  body  with  gun-metal  finish,  having  at  its 
upper  end  two  vertical  openings,  in  which  the  vernier  works,  the 
latter  operated  by  a  rack  and  pinion  movement.  The  readings  are 
taken  through  these  openings,  aided  by  light  reflected  from  a  white  opaque 
glass  reflector  attached  to  the  board  behind.  The  scale  is  graduated  on  one 
side  in  inches  and  lOths,  and  on  the  other  in  centimeters  and  millimeters,  the 
vernier  enabling  a  reading  to  be  taken,  in  each  case  respectively,  of  one- 
thousandth  of  an  inch  and  one-tenth  of  a  millimeter.  The  attached  ther- 
mometer consists  of  a  well  seasoned  tube  with  both  Centigrade  and  Fahren- 
heit scales,  with  the  figures  etched  on  the  stem.  It  is  so  mounted  that  it 
can  easily  be  removed  for  testing,  etc.  Beads  down  to  25%  inches  and  is 
therefore  not  satisfactory  for  altitudes  above  3,500  feet. 

Complete  with  board  back  of  finely  finished  hardwood,  to  which  is  attached  a 
brass  bracket  to  receive  the  ring  in  the  top  of  the  barometer,  a  ring  with 
steadying  screws  to  clamp  about  the  cistern,  and  white  opaque  glass  reflectors 
forming  a  translucent  background  for  reading  the  instrument 65.00 


No.  894. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


65 


No.  908. 


1 

i 

"     i 

! 

_* 

922.     No. 

1    1 

926.     No 

10 

. 

928.    No. 

895. 

896. 
898. 

899. 

900. 
908. 


909. 
917. 
918. 

920. 
922. 
924. 

926. 
928. 

930. 
932. 
934. 


BAROMETER,  Standard  Mercurial,  United  States  Weather  Bureau  Typ«.  Same  as  No.  894,  but 
without  the  board  back $57.50 

BACK  only  of  No.  894  Standard  Barometer 7.50 

BAROMETER,  Standard  Mercurial,  United  States  Weather  Bureau  Type.  Same  as  No.  894,  but 
with  a  scale  reading  down  to  20  in.  for  use  in  altitudes  up  to  10,000  feet 68.00 

BAROMETER,  Standard  Mercurial,  United.  States  Weather  Bureau  Type.  Same  as  Xo.  898,  but 
without  board  back 60.00 

BACK  only  of  Xo.  898  Standard  Barometer,  described  under  No.  894 8.00 

BAROMETER,  Recording  (Barograph).     Made  in  America.     The  movement  is  concealed  in  the 
base  of  the  instrument  and  is  worked  by  a  large  vacuum  pan.     In  mahogany  case,  glass  top 
and  sides,  and  storage  space  for  charts.     Special  charts,  with  instructions  for  weather  fore- 
casting are  supplied.     Complete  with  full  directions  for  use,  charts  for  a  year,  pen  and  ink. 
55.00 

BAROGRAPH  CHARTS,  for  No.  908  Barograph.     In  boxes  containing  one  year 's  supply. 

Per  box      2.50 

BAROGRAPH  CHARTS,  Style  No.  2,  for  old  style  imported  barographs  reading  28  to  31  inches. 
In  boxes  containing  one  year's  supply Per  box  2.25 

BAROGRAPH  CHARTS,  Unfigured,  but  graduated  for  a  3  inch  range.  For  old  style  imported 
barographs.  In  boxes  containing  one  year's  supply Per  box  2.25 

INK,  purple,  for  Barographs  and  Thermographs Per  bottle         .50 

BAROMETER  TUBE,  unfilled,  large  bore,  thick  wall,  one  end  sealed.     Length,  80  cm .37 

BAROMETER  TUBE,  unfilled,  same  as  No.  922,  with  glass  mercury  well  and  pipette  for  filling 
55 

BAROMETER  TUBE,  unfilled,  same  as  No.  922,  but  graduated  in  millimeters 2.50 

BAROMETER  TUBE,  Demonstration  Form,  unfilled,  with  funnel  top  and  with  stopcock  at  top 
and  bottom  for  easy  filling  and  emptying  of  the  tube.  Total  length,  104  cm.  Graduated  from 
100  to  780  mm  in  millimeter  divisions 8.00 


MERCURY  WELL,  japanned  iron.     Capacity  about  50  cc 40 

BAROMETER  TUBE,  Siphon  Type,  unfilled,  with  bulb  on  short  arm.    Length,  80  cm 75 


BAROMETER  TUBE,  Siphon  Type,  Bunsen's,  unfilled.      Graduated  at  the  top  of  each  arm  in 
millimeter  divisions 4.00 


66 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  940. 


No.  946. 


No.  948. 


No.  958. 


BATTERIES,  PRIMARY 


940. 

941. 
942. 
943. 
944. 
8040A 
946. 


BATTERY,  Buuseu,  for  open  circuit  work.  A  powerful  two-fluid  cell  of  about  1.9  volts  E.  M.  F. 
and  1.86  ohms  internal  resistance.  An  excellent  cell  for  operating  induction  coils,  motors,  etc., 
and  for  electrolysis  of  water.  Quart  size,  complete  without  chemicals $2.25 


CARBON  for  No.  940. 


948. 

949. 
950. 
951. 

958. 


959. 

960. 

961. 

8040C. 


.12 


ZINC  CYLINDER  with  binding  post  for  No  940 1.50 

CLAMP  for  No.  941  Carbon,  with  binding  post  for  wire 

POROUS  CUP,  2x4  inches,  for  No.  940 1 

GLASS  JAR,  4x5  inches,  for  No.  940 


30 

35 

20 

BATTERY,  Burn-Boston  Addwater.  A  battery  containing  an  exact  balance  of  active  elements, 
zinc,  carbon,  and  salt  solution. 

In  dry  cells  destruction  of  the  elements  goes  on  continuously,  whether  used  or  not.  In  the  Burn- 
Boston  this  process  is  arrested  while  the  current  is  not  being  used. 

The  zinc  shell,  being  insulated  from  the  electrolyte,  cannot  be  acted  upon  by  it.  Except  for  a 
pin  hole  vent  the  cell  is  tightly  sealed.  All  sources  of  leakage  are  thus  done  away  with. 

Distinctive  Features. 

(1)  Yields  from  three  to  twelve  times  the  service  of  dry  cells. 

(2)  "Will  never  leak  or  burst. 

(3)  Can  be  stored,  fully  charged,  for  any  length  of  time  and  in  any  climate. 

(4)  "Will  yield  all  of  its  phenomenal  electrical  content  whether  the  period  of  use  is  three  months 
or  three  years. 

Size,  7V^x2li^6x2ii/i6  inches;  voltage,  1.5  volts;  amperage,  20  amperes 1.25 

BATTERY,  Carbon  Cylinder,  for  open  circuit  work.  Well  adapted  for  all  telephone  and  bell 
service.  Initial  output,  1.4  volts,  6  amperes.  Cell  complete  with  chemicals 70 

CARBON  for  No.  948 40 

ZINC  ROD  with  binding  screw  for  No.  948 08 

GLASS  JAR  for  No.  948 30 

BATTERY,  Daniell,  gallon  size.  This  has  been  the  standard  cell  for  many  years  for  open  or 
closed  circuit  work.  The  best  for  all  laboratory  work  in  electrical  measurements.  Next  to  the 
standard  cells,  it  gives  the  most  constant  E  M.  F.,  about  1.08  volts,  which  remains  the  same  dur- 
ing the  life  of  the  cell.  Internal  resistance  from  2  to  5  ohms.  With  new  form  riveted  copper 
pocket  for  holding  copper  sulphate  crystals.  Complete  without  chemicals 2.00 

COPPER,  New  Form,  with  riveted  copper  pocket,  for  No.  958 80 

ZINC,  weight  about  two  pounds,  with  binding  screw  attached,  for  No.  958 60 

POROUS  CUP,  3x7  inches,  for  No.  958 50 

GLASS  JAR,  6x8  inches,  for  No.  958 40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


67 


: 


No.  964. 


No.  966A-B. 


No.  966D. 


No.  971  (with  cells). 


964.  BATTERY,  Dry,  Columbia,  Red  Label  No.  6.  The  best  dry  cell  on  the  market.  E.  M.  F.  on  open 
circuit,  l.o ;  maximum  amperage,  4  to  6;  E.  M.  F.  after  delivering  %  ampere  for  thirty  minutes, 
1.36 $0.40 

BATTERY,  Edison  Primary,  the  latest  development,  embodying  all  the  good  features  of  and  many 
improvements  in  the  class  of  cells  formerly  known  as  the  Edison  Lalande  and  later  as  the  Edison 
Bsco  Battery.  The  elements  are  the  same  as  in  the  earlier  types  but  the  efficiency  and  effec- 
tive capacity  have  been  greatly  increased  by  a  better  proportioning  of  active  materials  and  by 
an  improved  method  of  suspension.  These  cells  are  the  best  type  of  wet  cell  for  continuous 
service  because  of  their  very  low  internal  resistance  and  ease  of  renewal  of  exhausted  parts.  The 
new  type  of  cell  is  contained  in  glass  jars  made  of  the  new  heat  resisting  glass,  which  possesses 
also  greater  mechanical  strength  than  the  porcelain  jars  formerly  supplied.  In  selecting  cells 
for  laboratory  use,  it  is  important  to  select  a  sufficient  number  to  secure  the  necessary  voltage 
and  to  select  those  of  size  and  capacity  great  enough  to  deliver  current  at  the  proper  rate,  as 
the  larger  sizes  have  very  low  internal  resistance  and  long  life  and  consequently  operate  at  lowest 
maintenance  cost.  Initial  E.  M.  F.,  0.95  volts,  decreasing  to  about  0.65  on  average  load. 

Distinctive  Features. 

(1)  E.  M.  F.  constant  through  life  of  cells. 

(2)  Simplicity  and  ease  of  renewal. 

(3)  Visible  indication  of  approaching  exhaustion. 

(4)  Uniformity  of  units.  .  i 

(5)  Long  life  and  service. 

(6)  Entire  absence  of  local  action. 

(7)  Low  maintenance  cost. 

Xumber A  B  C  D 

Type 202  252  402  502 

Size  over  all,  inches 3%x6xll  3%x6xl2            5%x6%xl2i4            5%x6%xl2% 

Average  internal  resistance, 

ohms 0.05  0.05  0.04  0.04 

Capacity,  ampere  hours 200  250  400  500 

966.  COMPLETE  CELL 4.05  4.25  5.70  6.15 

967.  COMPLETE  RENEWAL  ......'  2.25  2.45  3.15  3.60 

968.  GLASS  JAR 1.40  1.50  2.40  2.40 

969.  PORCELAIN  COVER .45  .45  .50  .50 

970.  TERMINAL  NUTS  AND 

WASHERS Per  set  .25  25  .25  .25 

971.  BATTERY  TRAYS,  of  pressed  steel  heavily  japanned,  for  use  in  assembling  Edison  primary  bat- 

teries in  units  of  various  sizes.     Provided  with  handles  and  with  open  sides  for  inspection  of  ele- 
ments.    For  use  only  with  types  202  and  252  cells. 

Number ABC 

Type 2022  2023  2024 

For  cells,  number 2  3  4 

Size  over  all,  inches e^xll^xS  6V»xliy>xl2  6y,xllV>xl5% 

Each 2.40  2.70  3.00 

Number  D  E 

Type 2025  2026 

For  cells,  number 5  6 

Size  over  all,  inches 6%xll%xl9% 

Each 3.30  3.60 


68 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


MIO 
CLANC 
CEll 


No.  976. 


No.  980. 


No.  994. 


972. 

973. 
960. 
961. 
8040C. 
976. 

977. 

978. 

8040C, 

980. 

981. 
982. 
983. 
984. 

985. 
986. 
987. 
988.. 

989. 
990. 
991. 
994. 

995. 
950. 
997. 


BATTERY,  Fuller,  improved  form,  for  open  or  closed  circuit  work.  E.  M.  F.  about  2  volts;  initial 
internal  resistance  about  0.25  ohms.  Gallon  size,  complete  without  chemicals $2.00 

CARBON  AND  COVER  for  No.  972 90 

ZINC  for  No.  972 60 

POROUS  CUP  for  No.  972 '. 50 

GLASS  JAR,  6x8  inches,  for  No.  972 40 

BATTERY,  Gravity,  Crowfoot  Type,  especially  adapted  for  closed  circuit  work.  Standard  type 
for  telegraph  companies.  E.  M.  F.  about  1.1  volts;  internal  resistance  from  1  to  5  ohms.  Gal- 
lon size,  complete  without  chemicals 1.20 

COPPER  for  No.  976 17 

CROWFOOT  ZINC,  with  connector,  for  No.  976 70 

GLASS  JAR,  6x8  inches,  for  No.  976 40 

BATTERY,  Grenet,  French  Type,  pint  size.  Most  convenient  form  for  use  on  lecture  table,  giv- 
ing very  powerful  current  for  a  short  time.  The  E.  M.  F.  is  2  volts  at  the  start.  Small  inter- 
nal resistance.  Height  of  cell  8  inches.  Complete  without  chemicals 2.00 

15 

25 

.60 


CARBON  for  No.  980 

ZINC  for  No.  980 

GLASS  JAR  for  No.  980,  complete  with  brass  ring 


BATTERY,  Grenet,  French  Type,  one-quart  size.     10  inches  high.     Complete  without   chemicals. 

2.50 


CARBON  for  No.  984 

ZINC  for  No.  984 

GLASS  JAR  for  No.  984,  complete  with  brass  ring 


.20 
.30 
.90 


BATTERY,  Grenet,  French  Type,  two-quart  size.     12  inches  high.     Complete  without  chemicals. 
3.35 

CARBON  for  No.  988 35 

ZINC  for  No.  988 , 40 

GLASS  JAR  for  No.  988,  complete  with  brass  ring   1.20 

BATTERY,  Le  Clanche,  for  open  circuit  work.     Initial  output.  2  to  4  amperes  at  1.45  volts.  Com- 

65 

50 

08 

.17 


plete  with  chemicals 

POROUS  CUP,  sealed,  for  No.  994,  complete  with  chemicals 

ZINC  ROD  with  binding  screw  for  No.  994 

GLASS  JAR  for  No.  994. . 


CENTBAL  SCIENTIFIC  CO.,  CHI  , 'AGO,  TL  S.  A. 


69 


1000. 


1001. 
1002. 
1003. 
1004. 
1005. 
1006. 
1008. 


1010. 
1011. 
1012. 
1013. 

1014. 
1016. 


1017. 
1018. 
1019. 
1020. 


1021. 
1023. 
1024. 


No.  1008. 


No.  1016. 


No.  1020. 


BATTEEY,  Cenco  Plunge,  Single  Cell.  A  powerful,  compact  form  of  the  bichromate  battery,  ex- 
pressly designed  for  laboratory  and  lecture  table  work.  Elements  can  be  quickly  lifted  out  of 
the  solution  when  not  in  use.  Fiber  top,  with  nickel-plated  brass  trimmings.  Large  zinc  and 
carbon  elements  placed  close  together,  reducing  the  internal  resistance  to  a  minimum.  Initial 

E.  M.  F.,  about  2  volts;  internal  resistance  when  freshly  charged,  0.15  ohms $2.75 

BATTEEY,  Cenco  Plunge,  Two  Cells,  in  case  with  handles  6.50 

BATTERY,  Cenco  Plunge,  Four  Cells,  in  case  with  handles 12.50 

BATTEEY,  Cenco  Plunge,  Six  Cells,  in  case  with  handles 18.00 

CAEBON  PLATE  for  Cenco  Plunge  Battery,  4x3x^4  inches 25 

ZINC  PLATE  for  Cenco  Plunge  Battery,  4%x3x%  inches 40 

GLASS  JAE  for  Cenco  Plunge  Battery,  4x4x8  inches   55 

BATTEEY,  Laboratory  Plunge,  Four  Cells.  Similar  in  construction  to  the  Cenco  Plunge  Battery 
described  above,  the  essential  difference  being  in  the  elements,  which  are  larger,  and  the  ease, 
which  has  an  easy  lifting  motion,  with  a  deadfall  catch  not  liable  to  slip.  The  elements  are 
quickly  removed  from  the  solution.  Each  cell  may  be  used  singly,  two  or  more  in  series,  or  in 
parallel.  Any  cell  which  is  not  required  for  use  can  be  suspended  by  the  hook  from  the  axle. 
All  parts  are  interchangeable.  Unquestionably  the  best  battery  for  the  lecture  table.  Initial 
E.  M.  F.,  about  2  volts  per  coll;  internal  resistance  when  freshly  charged,  0.15  ohms.  Complete 

with  case 14.00 

BATTEEY,  Laboratory  Plunge,  Six  Cells.     Same  description  as  No.  1008.  Complete  in  case     18.00 

CAEBON  PLATE  for  Laboratory  Plunge  Battery,  6^x2%x%  inches 25 

ZINC  PLATE  for  Laboratory  Plunge  Battery,  <H4x2i/£x%  inches 60 

ELEMENTS  COMPLETE  for  Laboratory  Plunge  Battery.     Two  carbon  plates,  zinc  plate,  fiber 

top,  binding  posts  and  hooks ~.        1.65 

GLASS  JAE  for  Laboratory  Plunge  Battery,  2%x4i/J x7  inches 55 

BATTEEY,  Samson  No.  2.  A  popular  battery  for  open  oircuit  work.  It  is  the  best,  most  durable 
and  effective  of  all  cells  of  the  carbon  cylinder  type.  Eecuperates  very  quickly.  Dimensions 
over  all,  4%x4%x8  inches.  E.  M.  F.,  1.5  volts.  Internal  resistance  abo'ut  0.07  ohms.  Complete 

with  chemicals  . . .  .< 2.25 

CAEBON,  for  No.  1016 1.25 

ZINC  CYLINDEE,  for  No.  1016 , .75 

GLASS  JAE,  for  Xo.  1016 35 

BATTEEY,  Samson  No.  3.  Same  as  No.  1016,  but  larger.  Dimensions  over  all,  5*4x51/4x8% 
inches.  E.  M.  F.,  1.5  volts.  Internal  resistance  about  0.06  ohms.  Complete  with  chemicals. 

3.00 


CAEBON,  for  Xo.  1020 

ZINC  CYLINDEE,  for  No.  1020. 
GLASS  JAE,  for  Xo.  1020 


1.50 
.95 
.75 


70 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  IT.  S.  A. 


No.  1032. 


No.  1036A-D. 


No.  1036E. 


1026.  BATTERY,  Standard  Cell,  glass  part  only,  with  platinum  wires,  for  those  desiring  to  make  their 

own  standard  cells.  This  is  the  regular  H  form  and  may  be  used  to  make  any  of  the  ordinary 
forms  of  standards -. $1.30 

1027.  BATTERY,  Standard  Cell,  glass  part  only,  without  platinum  wires 80 

1028.  BATTERY,  Standard  Cell,  same  as  No.  1026,  on  stand  as  illustrated 3.00 

1030.  BATTERY  OF  FIVE  STANDARD  CELLS,  consisting  of  five  No.  1026  mounted  on  supports  and 

base  provided  with  bars,  traveling  plugs  and  binding  posts  for  convenient  combination  in 
series  and  parallel  12.50 

1032.  BATTERY,  Standard  Cell,  Weston,  unsaturated  type,  Model  4.     Consists  of  an  H-shaped  recep- 

tacle with  platinum  leads  which  pass  through  the  bottom.  One  limb  of  the  cell  contains  cad- 
mium amalgam;  the  other  mercury  and  a  paste  of  mercurous  sulphate.  The  cell  is  filled  to 
slightly  above  its  cross  arm  with  an  unsaturated  solution  of  cadmium  sulphate  and  sealed  to 
prevent  evaporation.  Porcelain  separators  prevent  the  ingredients  from  becoming  mixed.  E. 
M.  F.  between  1.0184  and  1.0189  volts.  With  manufacturers'  certificate  of  voltage 19.00 

1033.  BATTERY,  Standard  Cell,  Weston.     Same  as  No.  1032,  but  with  Bureau  of  Standards  certificate. 

23.50 

BATTERIES,  STORAGE 

BATTERIES,  Cenco  Storage.  These  batteries,  which  are  made  for  us  by  one  of  the  most  reliable 
manufacturers,  have  been  used  extensively  for  years  with  increasing  satisfaction  in  all  classes  of  service. 
The  different  sizes  in  each  class  have  the  same  plate  construction,  the  only  difference  being  in  the  size 
and  capacity  of  the  plates  or  elements.  The  voltage  is  approximately  two  volts  at  the  beginning  of 
discharge.  Each  battery  is  guaranteed  against  electrical  or  mechanical  defects,  and  within  the  dis- 
charge rates  specified  they  will  give  their  full  rated  capacities.  When  charged  at  the  normal  rate  given 
for  8-hour  discharge  rate  the  cells  will  be  charged  in  9  hours, 
battery  for  its  charging  and  proper  care. 

D        E 

2          5 

8%x5  5%x6 


Full  directions  will  be  sent   with   each 


No A 

No.  of  plates 2 

Size  of  plates 3x4 

Output  at  normal  discharge 

rate,  ampere  hours 8 

Charging  rate,  amperes...  1 
Discharge  rate  for  8  hours, 

amperes 1 

Discharge  rate  for  5  hours, 

amperes iy2 

Length  of  jar,  inches 1% 

Width  of  jar,  inches 3% 

Height  of  jar,  inches 7 

Weight    of    cell,    complete 

with  electrolyte,  Ibs 4 

1036.  COMPLETE  CELL, 

without  electrolyte  1.50 

1037.  GLASS     JAR     only 

Each    .70 


B 


5x5 

16 

2 


3 

21/4 


C 

2 

7x5 


F 
7 


G  H  J  K 

9  7  9  11 

5%x6  7%x7%  7%x7%  7%x7% 


L 
13 


24 
3 


21/4 

6% 
10 


32 
4 


6 

2% 
6y4 

12 


64 


10 
4% 
7% 


96 
12 


128 
16 


180 
22i/2 


12         16        22% 


15 
6% 
7% 
9% 


71/3       11       13 1/,      30 


20 

7% 


49 


30 

61/2 


51 


240 
30 

30 

40 
7% 
9Vs 
Hi/2 

63 


300 
371/2 

37% 

50 


360 
45 

45 

60 
11 

9% 


79 


96 


2.50     3.45      4.35    10.00    11.10    16.40     18.40        23.30        27.60       33.70 


.80     1.00      1.25      1.50      1.50      1.75       2.25 


2.75 


3.50 


9.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


71 


No.  1040. 


No.  1042. 


No.  7698. 

BATTERIES,  Cenco  Portable  Storage.  These  batteries  are  of  the  same  general  type  as  the  Cenco 
Storage  Batteries  described  on  the  preceding  page,  but  are  especially  m^de  to  stand  transporta- 
tion. Under  ordinary  conditions  they  should  last  for  at  least  five  years,  and  they  are  guaranteed 
for  one  year  against  everything  except  abusive  handling.  The  jars  are  of  the  best  vulcanite,  and 
are  enclosed  in  hardwood  cases  provided  with  a  handle  and  finished  with  acid-proof  paint. 
Strength  is  added  to  the  jar  when  placed  in  the  case  by  entirely  surrounding  it  with  an  elastic 
sealing  compound.  Short  circuiting  is  prevented  by  an  exceptionally  wide  distance  between 
the  plates.  The  acid  cannot  spill  under  any  ordinary  conditions  of  service.  Batteries  are 
charged  ready  for  use.  Initial  E.  M.  F.,  6  volts. 

No A  B  C  D 

Output  at  normal  discharge  rate,  ampere 

hours '40  60  80  120 

Charging  rate,  amperes 4%  6  7  8% 

Discharge  rate  for  8  hours,  amperes 5  7%  10  15 

Length,  inches 8%  10     -'  '•         11  14% 

Width,  inches 6  714 

Height,  inches  9  9*4  9^4  9'/4 

Weight  of  cell,  complete  with  electrolyte,  Ibs 23 


1040.    COMPLETE  CELL,  charged $14.30 


35 
17.50 


45 
25.75 


66 
31.25 


BATTERIES,  Cenco  Sealed  Storage.  These  batteries  are  contained  in  glass  jars,  sealed  with  a 
smooth  and  strong  compound,  and  are  ideal  for  isolated  and  portable  work  where  care  in  hand- 
ling may  be  given.  They  are  especially  desirable  for  clock  and  bell  systems,  and  for  demonstra- 
tion work.  Each  cell  is  made  up  with  a  negative  plate  on  either  side  of  the  positive,  giving 
equal  action  on  each  side  and  preventing  buckling  and  sulphation.  The  sealing  compound  pre- 
vents evaporation  of  the  electrolyte  and  keeps  the  cell  clean  at  all  times.  The  batteries  are 
shipped  completely  assembled  and  charged  ready  for  immediate  use.  Initial  E.  M.  F.,  2  volts. 


No. 


Output  at  normal  discharge  rate,  ampere 

hours 

Charging  rate,  amperes 

Discharge  rate  for  8  hours,  amperes 

Length,  inches 

Width,  inches 

Height,  inches 

Weight  of  cell,  complete  with  electrolyte,  Ibs 

1042.    COMPLETE    CELL,    charged 


8 

1JA 

l 

4 

2% 


16 

2% 

2 

4 
2% 


10 
3.50 


11 

4.40 


36 

5 
4% 

ey* 

3 

15 

22 

7.00 


D 

56 

8 

7 
6*4 

3 

15 
24 
8.60 


7698.  BATTERY  TESTER,  or  Syringe  Battery  Hydrometer.  A  very  convenient  form  of  battery 
hydrometer,  which  eliminates  the  spilling  o  acid  when  making  a  battery  test.  The  pointed  tuba 
is  inserted  into  the  battery  and  the  electrolyte  drawn  up  into  the  hydrometer  containing  tube 
by  means  of  the  rubber  bulb.  After  the  reading  is  obtained  the  fluid  is  ejected  back  into  the 
battery.  Complete  table  showing  relation  between  specific  gravity  and  battery  strength  in- 
cluded    1.00 


7699.    HYDROMETER  onlv  of  No.  7698. 


.45 


72 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  1044E. 


BATTERIES,    Storage,    Exide   Laboratory.     These    batteries   are    extensively   used   in   scientific 

laboratories,  both  in  this  country  and  Europe.     We  guarantee  them  to  give  good  service  at  the 

capacities  designated. 
The  voltage  of  each  cell  of  all  capacities  is  slightly  above  two  volts  on  open  circuit  and  during 

discharge  at  the  eight-hour  rate  varies  from  that  point  at  the  beginning  to  1.75  volts  at  the  end. 
We  have  selected  types  that  are  adapted  to  the  various  laboratory  demands.     Other  sizes  will  be 

quoted  upon  application.     Cells  must  be  charged  before  using.     All  cells  are  in  glass  jars. 
The  prices  given  include  the  electrolyte  and  connecting  bolts. 
Note:     If  desired  for  permanent  installation  in  units  of  two  or  more,  cells  may  be  ordered  with 

connecting  straps  burned  together. 

No  ......................  :  ............  ..........  A  B 

Type  ...........................................  PT  ET 

No.  of  Plates  ....................................  2  2 

Size  of  Plates  ...................................  8%x5  7%x7% 

Output  at  normal  discharge  rate,  ampere  hours  .....  24  36 

Charging  rate,  amperes  ...........................  4% 

Discharge  rate  for  8  hours,  amperes  ...............  3  4% 

Discharge  rate  for  5  hours,  amperes  ...............  4%  6% 

Discharge  rate  for  3  hours,  amperes  ............  ...  6  9 

Length  of  jar,  inches  .............................  2y2  2% 

Width  of  jar,  inches  .............................  6  8% 

Height  of  jar,  inches  .............................  12  11 

Height  of  complete  cell,  inches  ...................  12y2  liyle                       15% 

Weight  of  cell,  complete  with  electrolyte,  Ibs  .......  13%  42% 

1044.    COMPLETE  CELL,  with  electrolyte,  but  not  charged..  .  $7.25  9.10                      18.80 


C 
D 

7 

6x6 
60 

71/2 
7% 


15 

6% 

7% 


1045.    GLASS  JAR  only 

No 

Type 

No.  of  Plates 

Size  of  Plates  

Output  at  normal  discharge  late,  ampere  hours. 

Charging  rate,  amperes ; 

Discharge  rate  for  8  hours,  amperes 

Discharge  rate  for  5  hours,  amperes 

Discharge  rate  for  3  hours,  amperes 

Length  of  jar,  inches 

Width  of  jar,  inches 

Height  of  jar,  inches 

Height  of  complete  cell,  inches 

Weight  of  cell,  complete  with  electrolyte,  Ibs.. 


1044.  COMPLETE  CELL,  with  electrolyte,  but  not  charged . 

1045.  GLASS  JAR  only 


1.50 
D 

E 

5 
7%x7% 

80 

10 

10 

14 

20 

5% 

9% 
12% 
17% 

58 

21.90 
2.80 


1.80 

E 
E 
7 

'•%x7 
120 
15 
15 
21 
30 
6% 
9% 
12% 
17% 
80 

29.60 
3.30 


2.55 

F 
E 
9 

7%x7% 

160 

20 

20 

28 

40 

8% 

9% 

12% 

17% 

100% 

37.35 
3.90 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


73 


No.  1050A, 


Plates  of  No.  1048C. 


No.  1048E. 


BATTERIES,  Edison  Storage.  These  batteries  are  composed  of  negative  plates  of  iron  oxide  and 
positive  plates  of  nickel  oxide  immersed  iu  an  alkaline  solution.  The  retaining  cans  are  of 
corrugated  sheet  steel,  welded  at  the  seams,  and  electroplated  with  nickel,  which  protects  the 
steel  from  rust  and  gives  each  cell  an  attractive  appearance.  They  are  made  in  two  types:  Type 
'"A"  for  heavy  current  duty;  Type  "B"  for  lighter  work,  such  as  for  ignition,  small  lighting 
outfits,  clocks,  bells,  etc.  These  batteries  are  guaranteed  for  five  years  if  directions  are  care- 
fully  followed.  DISTINCTIVE  FEATURES. 


Freedom  from  obnoxious  fumes. 
No  injury  from  short  circuits. 
Low  maintenance  cost. 


Light  weight  and  small  space  occupied. 

No  sulphating  or  deterioration  on  open  circuit. 

No  breakage  of  containers. 

Extremely  long  life  in  service. 

Freedom  from  sensitiveness  to  external  conditions  such  as  temperature,  vibration,  concussion,  etc. 

Number   A                B               C                D              E  F 

Type   Bl-H           B-2            B-4            B-6           A-4  A-6 

No.  of  positive  plates 1  24646 

Output  at  normal  discharge  rate,  ampere 

hours 18.75         37.5  75.0         112.5         150.0         225.0 

Charging  rate,  amperes 3.75           7.5           15.0           22.5           30.0  45.0 

Discharge  rate  for  8  hours,  amperes 2.25           4.7.")           9.5           14.0           18.5  28.0 

Discharge  rate  for  5  hours,  amperes 3.75           7.5           15.0           22.5           30.0  45.0 

Mean  effective  internal  resistance,  ohms.        .024         .012            .006           .004            .003  .002 

Length  of  jar,  inches 1.55            1.55            2.58           3.75           2.64  3.80 

Width  of  jar,  inches 5.03           5.03           5.09           5.09           5.13  5.13 

Height  of  complete  cell,  inches 10.44           8.69           8.69           -.7-         13.38  13.38 

Weight  of  renewal  solution  per  cell,  Ibs.       2.0             1.0             1.7             2.5             2.9  4.3 

Wgt.  of  cell,  complete  with  electrolyte, Ibs.      4.9             4.7              7.5            10.8            13.9  19.4 
1048.    COMPLETE  CELL,  with  electrolyte,  but  not 

charged    84.95           7.26           9.68         13.31         16.34  24.20 

BATTERIES,  Edison  Storage,  supplied  in  sets  of  five,  assembled  in  standard  suspension  trays 
contained  in  a  steel  battery  box.  The  initial  voltage  of  each  set  is  6.5  volts  and  the  direct  cur- 
rent voltage  necessary  to  charge  is  9. 

No ". A  B 

Type B-2  B-4 

Output  at  normal  discharge  rate,  ampere  hours 37.5  75 

Charging  rate,  amperes 7.5  15 

Weight.  Ibs.,  in  tray 27  41.5 

Height,  inches  .  . .' 10%  10*4 

Width,  inches 7\  7% 

Length,  inches IIT^  17% 

1050.  BATTERY,  complete  in  box 39.60  51.70 

1051.  ELECTROLYTE  for  renewal  o"  Edison  Storage  Batteries.     In  cans. 

No A  B 

No.  of  pounds  in  can 2  5 

Per  can  .40  .75 


74  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 

BATTERY  DIRECTIONS 

Amalgamating.  A  good  method  for  amalgamating  a  zinc  element  is  to  dip  it  into  acid,  then  pour  a 
few  drops  of  mercury  on  the  surface  and  rub  in  with  a  piece  of  cloth  attached  to  a  stick.  This  is  per- 
haps the  best  and  quickest  method  although  the  most  expensive. 

Amalgamating  Fluid.  2  ounces  mercury,  1  ounce  aqua  regia,  10  ounces  water.  Dip  zinc  into  solution 
and  then  wash  with  water.  No  need  of  brush  or  rag.  Zinc  element  should  be  thoroughly  cleaned  before 
amalgamating  by  means  of  a  metal  scratch  brush  or  coarse  emery  cloth. 

Bunsen  Battery.  Outer  cell  contains  amalgamated  zinc  plate  dipping  into  dilute  sulphuric  acid  (by 
weight  10  parts  water  to  1  part  acid).  In  inner  porous  cup,  a  piece  of  carbon  dips  into  nitric  acid  of 
full  strength.  Obnoxious  nitrogen  oxide  fumes  may  be  suppressed  in  a  large  measure  by  the  addition 
of  a  small  quantity  of  potassium  dichromate.  If  desired  the  nitric  acid  may  be  replaced  by  a  chromic 
acid  solution.  (Sec  Sulpho-Chromic  Salt  below.) 

Burn-Boston  Battery.     To  make  active,  ready  for  use,  add  plain  water. 

Carbon  Cylinder  Battery.  Place  6  ounces  ammonium  chloride  in  jar  and  fill  with  water  to  two- 
thirds  its  capacity.  Stir  well  until  the  salt  is  entirely  dissolved.  Place  elements  with  zinc  inside  carbon 
cylinder  as  illustrated. 

Columbia  Dry  Battery.  Should  be  entirely  discarded  after  its  amperage  has  dropped  to  a  point  un- 
fitting it  for  use,  as  it  cannot  be  recharged. 

Daniell  Battery.  The  zinc  element  is  placed  in  a  porous  cup  containing  sulphuric  acid  (1  part  acid 
to  20  parts  water,  by  weight).  The  copper  element  encircles  a  porous  cup  and  dips  into  saturated  copper 
sulphate  solution,  kept  continually  saturated  by  the  addition  of  an  excess  of  copper  sulphate  crystals  on 
bottom  of  jar.  Solution  is  more  effective  by  addition  of  few  cubic  centimeters  of  sulphuric  acid. 

(In  our  No.  958  a  pocket  is  provided  for  holding  excess  crystals  of  copper  sulphate.) 

Edison  Primary  Battery.  The  exhaustion  of  the.  cell  is  indicated  by  holes  appearing  in  the  lower 
part  of  the  zinc  plates.  When  this  point  is  reached,  a  complete  renewal  (see  No.  967)  should  be  obtained 
as  the  parts  are  so  proportioned  that  all  become  exhausted  at  the  same  time.  Directions  are  furnished 
with  each  renewal. 

Fuller  Battery.  Fill  glass  jar  half  full  of  chromic  acid  solution  made  from  Sulpho-Chromic  Salt 
(see  below),  place  1  teaspoonful  mercury  and  2  tablespoons  full  of  common  salt  in  the  porous  cup  and 
fill  with  water  to  l1/^  inches  of  top.  The  carbon  element  containing  the  porous  cup  is  then  placed  in  the 
glass  jar,  the  zinc  is  placed  in  the  glass  jar  and  the  cover  over  it.  The  solution  should  fill  the  glass  jar  to 
within  an  inch  of  the  top. 

Gravity  Battery.  This  type  of  battery  is  merely  a  form  of  Daniell  cell,  where  the  two  solutions  are 
kept  separate  by  their  difference  in  specific  gravity.  Place  2  pounds  copper  sulphate  crystals  in  bottom 
of  jar  with  copper  element.  Add  clear  water  to  fill  the  jar  when  elements  are  in  position.  Suspend  zinc 
over  edge  of  jar  and  connect  the  two  plates  through  a  resistance  of  10  ohms  or  more.  When  the  solutions 
have  separated,  that  around  the  zinc  plate  being  colorless,  while  that  around  the  copper  is  blue,  the  cell 
is  ready  for  action.  If  during  this  time  the  zinc  plate  has  become  covered  with  precipitated  copper,  it 
should  be  taken  out  and  brushed  off  until  the  surface  is  bright.  The  separation  of  the  two  solutions 
may  be  hastened  by  adding  some  crystals  of  zinc  sulphate  or  a  small  amount  of  dilute  sulphuric  acid. 

Grenet  Battery.  In  this  cell,  the  zinc  plate  between  two  carbon  plates  dips  into  a  chromic  acid  solu- 
tion. (See  below.)  When  this  coll  is  exhausted,  the  rich  reddish  color  of  chromic  acid  will  be  replaced 
by  a  muddy  dark  green  color. 

Chromic  Acid  Solution.  There  are  many  different  formulae,  but  the  most  convenient  method  of 
making  a  generally  useful  acid  is  by  simply  dissolving  prepared  chromic  acid  salt  in  water.  (See  Sulnho- 
Chromic  Salt,  below.) 

A  useful  formula  is,  30  parts  sodium  dichromate,  100  parts  water  arid  23  parts  sulphuric  acid  (sp. 
gr.  1.845) ;  all  by  weight. 

LeClanche  Battery.  Directions  furnished  under  carbon  cylinder  cell  apply  to  this  type  of  cell,  ex- 
cept that  zinc  rod  is  placed  outside  of  porous  cup. 

Plunge  Battery.     Elements  and  directions  under  Greuet  type  apply  to  this  type  of  battery. 

Samson  Battery.     Directions  furnished  under  carbon  cylinder  cell  apply  to  this  type  of  cell. 

Storage  Batteries.  These  cells  make  the  most  convenient  source  of  electrical  supply,  providing  the 
laboratory  is  equipped  for  charging.  Full  directions  for  use  and  for  charging  accompany  each  cell. 

BATTERY  FLUID 

CENCO  SULPHO-CHKOMIC  SALT.  (Formula  patented.)  For  making  Battery  Fluid  for  Plunge 
Batteries  and  Grenet  Cells  and  to  replace  the  Nitric  Acid  in  Grove  and  Bunsen  Cells  it  will  be  found 
that  Cenco  Sulpho-Chromic  Salt  is  without  an  equal.  Its  use  does  away  with  all  handling  of  acids  in 
liquid  form.  One  jar  (2  Ibs.)  is  sufficient  for  three  quarts  of  battery  fluid Per  jar  $0.80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


75 


No.  1052.  No.  1053.     No.  1054.       No.  1055.  No.  1056.        No.  1057.       No.  1059. 


No.  1058. 


\  PRESS 

\DOWN 

\HERE 

No.  1070A. 


PRESS 
.DOWN 
HERE, 
No.  1070B. 


Illustrations  are  full  size. 

BATTERY  BINDING  POSTS 


No.  1070C. 


1052.  BINDING  POST,  American  form,  with  wood  screw,  small    $0.10 

1053.  BINDING  POST,  American  form,  with  wood  screw,  large 15 

1054.  BINDING  POST,  American  form,  with  wood  screw,  double .20 

1055.  BINDING  POST,  American  form,  with  machine  screw,  small 10 

1056.  BINDING  POST,  American  form,  with  machine  screw,  large 15 

1057.  BINDING  POST,  American  form,  with  machine  screw,  double 20 

1058.  BINDING  POST,  American,  form,  extra  heavy  with  two  nuts  for  attaching  to  board  or  table  top. 

1.00 

1059.  BINDING  POST,  English  form,  with  machine  screw,  small 15 

1060.  BINDING  POST,  English  form,  with  machine  screw,  large 25 

1061.  BINDING  POST,  English  form,  with  machine  screw,  large,  double 30 

1062.  BINDING  POST,  combined  American  and  English  form,  with  machine  screw 30 

1064.  BINDING  POST,  new  form,  combined  American  and  English,  with  machine  screw 25 

1066.  BINDING  POST,  new  form,  combined  American  and  English,  with  wood  screw 25 

1068.  BINDING  POST,  with  plate  for  wood  screws,  double 30 

1070.  BINDING  POST,  Spring,  of  brass,  Fahnestock  Patent.     Will  take  any  size  wire  up  to  No.  10  B.  & 

S.  gauge.     Styles  A  and  B  are  identical,  except  B  is  provided  with  a  lug  to  which  wire  may  be 

soldered.     Style  C  is  double. 

No A  B  C 

Length,  inches I'/fo  1^6 

Width,  inches %  % 

Each 03  .04  .08 


76 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1092.  

BATTERY  CONNECTORS  Illustrations  are  full  size. 

CONNECTOR,  Clip,  for  holding  small  electrodes  in  experimental  work  on  electroplating.  A  small 
American  binding  post  soldered  to  a  spring  clip;  handle  of  clip  bent  to  hang  over  edge  of  bat- 
tery jar  or  tumbler $0.30 

CONNECTOR,  double   12 

CONNECTOR,  double;  one  end  for  wire  and  other  slotted  for  receiving  plates  %-inch  thick  or  less. 

20 

30 

40 

30 

.30 
.12 


CONNECTOR,  triple 

CONNECTOR,  quadruple.. 

CONNECTOR,  for  zinc 

CONNECTOR,  for  carbon. 

CONNECTOR  TIP,  for  use  in  making  connections  with  American  binding  posts. 


1072. 

1074. 
1076. 

1078. 
1080. 
1082. 
1084. 
1086. 
1087.  CONNECTOR,  consists  of  two  No.  1086  connector  tips  attached  to  ends  of  3  feet  flexible  silk  cord. 

.45 

1090.    CONNECTOR  TIP,  Universal,  for  use  in  connecting  to  either  English  or  American  binding  posts. 

Very  convenient.     To  be  soldered  to  cord -05 

1092.    CONNECTORS,  consisting  of  two  No.  1090  Connector  Tips  soldered  to  the  ends  of  flexible  silk  cord. 

No A  B 

Length  of  cord,  inches 6  36 

Each 20  .30 

1094.    CORD,  Flexible  Silk,  as  used  on  Nos.  1087  and  1092.     For  small  currents Per  yard         .10 

UNIVERSAL  TEST  CLIPS.  Time  savers  in  any  electrical  work  requiring  quick  temporary  connec- 
tions, since  they  may  be  attached  to  the  ends  of  a  connecting  wire  and  used  to  make  connections  at 
any  point  by  simply  clipping  on  to  binding  posts  or  wire.  Made  of  copper  anl  may  be  used  over  and 
over  again.  Suggested  for  use  with  test  sets,  with  voltmeters,  on  shop  testing  devices,  as  a  helix  clip,  by 
meter  departments,  in  college  and  commercial  laboratories,  on  motor  and  transformer  test  floors,  in  motion 
picture  projection  work  and  in  charging  storage  batteries.  For  storage  battery  work  the  lead  plated  clip 
No.  1098  should  be  specified. 
1096.  TEST  CLIP,  20  ampere  capacity,  provided  with  binding  post  for  attaching  wire;  spread  of  jaws, 

%  in -18 

1098.  TEST  CLIP.     Same  as  No.  1096,  but  lead  plated  to  prevent  corrosion,  particularly  in  storage  bat- 

tery work   -18 

1099.  INSULATOR,  for  Nos.  1096  and  1098  Test  Clips,  of  soft  rubber.     Shown  in  phantom  in  the  illus- 

tration           -06 

1100.  CONNECTOR,  consists  of  two  No.  1096  Test  Clips,  attached  to  the  ends  of  3  feet  of  flexible  single 

lamp  cord.     Carrying  capacity  6  amperes -70 

1101.  CONNECTOR,  consists  of  two  No.  1098  Test  Clips,  attached  to  the  ends  of  3  feet  of  flexible  single 

lamp  cord.     Carrying  capacity  6  amperes -70 

BATTERY  JARS,  see  Jars,  Nos.  8040  and  8042. 
BATTERY  POROUS  CUPS,  see  general  heading  Batteries. 
BEADS,  Glass,  see  Nos.  7126  and  7128. 


CENTRAL,  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


77 


No.  1124. 
No.  1132. 


No.  1126. 
No.  1136. 


No.  1128. 
No.  1134. 


No.  1130. 


BEAKERS 

1124.     BEAKERS,  Resistance  Grade,  Griffin's  low  form,  with  Up. 


Capacity,  ce 30  60  90  120  150  180  250 

Number  in  original  case 216  216  156  156  156  168  168 

Each    $  0.12  .12  .13  .14  .15  .16  .17 

Per  100  in  original  case 10.80  10.80  11.70  12.60  13.50  14.40  15.30 

Capacity,  cc 400  500  600  700  800  1000  1400 

Number  in  original  ease 84  84  72  72  48  48  24 

Each   22  .25  .26  .30  .34  .40  .55 

Per  100  in  original  case 19.80  22.50  23.40  27.00  30.60  36.00  49.50 


1126.    BEAKERS,  Resistance  Grade,  usual  tall  form  with  lip. 

Capacity,  cc 30         60       120       180 

Number  in  original  case 216       216       120       168 

Each 12        .12        .14        .16 

Per  100  in  original  case 10.80    10.80    12.60    14.40 

1128.    BEAKERS,  Resistance  Grade,  usual  tall  form  without  lip. 

Capacity,  ce 30         60       120       180 

Number  in  original  case 216       216       120       168 

Each 12       .12       .14       .16 

Per  100  in  original  case 10.80    10.80    12.60    14.40 

1130.    BEAKERS,  Resistance  Grade,  extra  tall  form  without  lip. 

Capacity,  cc 

Number  in  original  case 

Each   

Per  100  in  original  case , 

1132.    BEAKERS,  Pyrex  Glass,  Griffin's  low  form,  with  lip. 

Capacity,  cc 50  100  150 

Number  in  original  case 216  156  156 

Each    16  .17  .19 

Per  dozen  in  original  case 1.73  1.84  2.05 

Capacity,  cc 1000  1300  1500 

Number  in  original  ease 48  24  24 

Each    54  .65  .73 

Per  dozen  in  original  case 5.83  7.02  7.88 

1134.    BEAKERS,  Pyrex  Glass,  usual  tall  form,  without  lip. 

Capacity,  cc 100       150       200  300 

Number  in  original  ease 156       120       168  144 

Each 17        .19        .21  .25 

Per  dozen  in  original  case 1.84      2.05     2.27  2.70 

1136.     BEAKERS,  Pyrex  Glass,  usual  tall  form  with  lip. 

Capacity,  cc 100       150  200  300 

Number  in  original  case 156        120  168  144 

Each 17        .19  .21  .25 

Per  dozen  in  original  case 1.84   2.05  2.27  2,70 


250  350  500  700  1000 

144  60  60  48  36 

.17  .21  .25  .30  .40 

15.30  18.90  22.50  27.00  36.00 

250  350  500  700  1000 

144  60  60  48  36 

.17  .21  25  .30  .40 

15.30  18.90  22.50  27.00  36.00 


90  180     250 

120  144     144 

.13  .16     .18 

11.70  14.40    16.20 

250  400    600 

168  84     72 

.23  .27     .33 

2.48  2.92    3.56 

2000  2500   3000 

12  12     10 

.98  1.20    1.40 

10.58  12.96   15.12 

400  500  600  800 

60  60  48  48 

.27  .29  .33  .38 

2.92  3.13   3.56   4.10 

400  500  600  800 

60  60  48  48 

.27  .29  .33  .38 

2.92  3.13   3.56   4.10 


300 

168 

.18 

16.20 

2000 

12 

.82 

73.80 

1200 

36 

.50 

45.00 

1200 

36 

.50 

45.00 

350 

72 

.23 

20.70 

800 

48 

.38 

4.10 

4000 

10 

1.80 

19.44 

1000 

36 

.54 

5.83 

1000 

36 

.54 

5.83 


78 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1140. 


No.  1142. 


Nos.  1144-8. 


No.  1150. 


No.  1152. 


BEAKERS,  Phillips,  see  Flasks,  Assay. 

1140.    BEAKERS,  Sugar,  heavy,  with  lip. 

Capacity,    cc 175          900 

Each   $0.30        .65 

1142.     BEAKER,  Heavy  Tumbler  Shaped,  with  pour-out,  not  for  boating.     Capacity,  8  ounces 25 

1144.     BEAKERS,  Aluminum,  with  lip.  Capacity,  cc 125  250  500  1000 

Each 60  .85  1.00  1.65 

1146.     BEAKERS,  Copper,  with  lip.     Capacity,  cc 125  250  500  1000 

Each 65  .85  1.10  1.75 

1148.     BEAKERS,  Copper,  with  lip,  nickel-plated  for  sugar  analysis. 

Capacity,   cc 125          250          500        1000 

Each    70          .90        1.15        1.65 

1150.     BEAKERS,  Best  American  Porcelain,  glazed  inside  and  outside,  without  lip. 

No 1  2  3  3A  4  5  6 

Capacity,  cc 165  340  580  700  970  1500  1775 

Diameter  of  body,  mm 52  65  78  83  93  104  110 

Diameter  of  rim,  mm 62  74  87  93  103  114  122 

Height,  mm 93  118  143  154  167  198  209 

Each   i 75  1.00  1.20  1.50  1.80  2.50  4.00 

1152.  BEAKERS,  Dye  Pots,  Best  American  Porcelain,  glazed  inside  and  outside  to  heavy  supporting 
rim.  Without  lip. 

No A                B 

Capacity,  cc 310  1500 

Diameter  of  body,  mm 74              108 

Diameter  of  rim,  mm 79              120 

Height,  mm 123              188 

Each   • 1.20  2.75 

1156.  BEAKERS,  Opaque  Fused  Silica,  Griffin's  low  form  with  lip.  Capable  of  resisting  tempera- 
tures up  to  about  1200°C.  continuously,  and  unaffected  by  mineral  or  organic  acids  except 
hydrofluoric,  and  phosphoric  at  high  temperatures.  Alkalies  in  solution  at  low  temperatures 
do  not  affect  the  ware,  but  at  high  temperatures  or  in  fusions  readily  attack  it.  Its  very  low 
coefficient  of  expansion  enables  it  to  withstand  sudden  changes  in  temperature. 

Capacity,    cc 50          100         150          200          250          400          500          600          800 

Each 1.13         1.25         1.38        1.50         1.81         2.13         2.44        2.75        3.31 

1158.  BEAKERS,  Transparent  Quartz,  with  lip,  prepared  from  rock  crystal.  Melting  point  about 
1600°C.  Not  attacked  by  water  at  room  temperatures  or  at  the  boiling  point.  Less  soluble 
in  alkaline  solutions  than  the  best  glass.  Not  attacked  by  dilute  acids  except  hydrofluoric; 
concentrated  sulphuric  acid  has  no  appreciable  effect  at  100°C. 

Capacity,   ec 25  50         100         200         250 

Each    4.80         7.20       12.50       18.00       21.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


79 


No.   1160. 


No.   1162. 


No.   1170. 


BELL  JARS 


All  of  our  bell  jars  are  made  of  clear  glass  and  are  well  shaped.     All  rims  are  reground  in  our  own 
factory,  thus  insuring  a  good  contact  with  the  pump  plate,  which  is  not  possible  with  ordinarv  grinding. 


1160.     BELL  JABS,  High  Straight  Form,  Knob  Top,  with  reground  rim. 


No 

Height,  inside,  inches... 
Diameter,  inside,  inches.. 

Capacity,  gallons 

Each  . 


A 
9 

5 

% 
$1.80 


B 

11 

6 

1 

2.40 


C 
15 

7 

2 
3.15 


D 
15 

8% 
3 

4.00 


1162.     BELL  JARS,  High  Straight  Form,  Open  Top,  with  reground  rim  and  top  ground  flat. 

No A  B 

Height,  inside,  inches 9  11 

Diameter,  inside,  inches 5  6% 

Diameter  of  opening,  inches 1  114 

Capacity,  gallons y2  1 

Each .* 1.80  2.40 


E 
18 

9 

4 
5.60 


C 
15 

7 

1% 
2 
3.15 


1164.     BELL   JAR,    High   Straight   Form,    Tubulated   Top,   to   take   No.   0   rubber   stopper:     with   re- 
ground  rim.     Inside  height,  It  inches;  inside  diameter,  6'/i  inches;  capacity,  1  gallon..      $2.40 

1166.     BELL  JABS,  High  Straight  Form,  Tubulated  Top,  with  ground-in  glass  stopper  and  reground  rim. 


Height,  inside,  inches.. 
Diameter,  inside,  inches. 

Capacity,  gallons 

Each  . 


1168.     BELL  JARS,  High  Swelled  Form,  Knob  Top,  with  reground  rim. 

No 

Height,  inside,  inches 

Diameter,  inside,  inches 

Capacity,  gallons 

Each  . 


A 
9 
5 

V2 
2.00 


B 
11 

6 

1 
2.50 


A 

10 

6 

1 

2.40 


C 
15 

7 

2 
3.15 


B 

12 

7 

2 

3.15 


1170.     BELL  JAR,  Extra  High  Form,  with  reground  rim,  for  use  with  a  full  length  barometer  tube  in 
studying  the  effect  of  reduced  pressure  on  the  barometric  column 


80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1172. 


No.  1174. 


No.  1176. 


No.  1184. 


No.  1186. 


No.  1188. 


No.  1190. 


No.  1192. 


No.  1196. 


1172.    BELL  JABS,  Low  Straight  Form,  Knob  Top,  with  reground  rim. 

No A            B           C  D           E           F  G 

Height,  inside,  inches i-'Vi         3M.          4  10  11 

Diameter,  inside,  inches 456  10          12  16 

Each   $0.90       1.30       1.85  2.60       3.70      5.35  8.10 

1174.    BELL  JAR,  Low  Swelled  Form,  Open  Top,  (Hand  and  Bladder  Glass),  both  rims  ground.     Diam- 
eter at  the  bottom '  rim,  4%  in. ;  height,  4  in 2.25 

1176.  BELL  JAR,  Capped.     No.  1164  fitted  with  a  brass  cap  for  receiving  either  stopcock  or  a  sliding 

rod.     Without  stopcock  or  rod 4.00 

1177.  SLIDING  ROD,  with  knob  at  one  end  and  hook  at  the  other  for  manipulation  of  apparatus  inside 

of  No.  1176  Bell  Jar.     Complete  with  packing  screw,  threaded  7/16^16 1.50 

1184.    BELLS,  Electric,  D.  C.     Iron  box,  pivoted  armature. 

No A  B  C 

Diameter  of  gong,  inches 2%  3  4 

Each $0.50  .55  .70 

1186.  BELLS,  Electric,  D.  C.,  Skeleton  Type.  Pivoted  armature,  superior  workmanship,  nickel-plated 
gong  giving  clear,  penetrating  tone. 

No A                 B                 C                 D 

Diameter  of  gong,  inches 4                  6                  8                 10 

Each 2.25             3.60             5.00             8.00 

1188.    BUZZER,  Electric,  D.  C.     Iron  box $0.45 

1190.  BELLS,  Electric,  A.  C.,  so-called  Transformer  Bells.  For  use  on  Nos.  F3879  Bell  Ringing  Trans- 
formers on  voltages  from  6  to  18.  Loud'ringing  dependable  bells  wjth  carbon  contacts,  laminated 
field  and  cores,  closed  movement  and  insulated  current  carrying  parts. 

No : A  B  C  D 

Diameter  of  gong,  in 3  4  6  8 

Each 4.20  4.50  10.60  13.20 

For  TRANSFORMERS  for  use  with  No.  1190,  see  general  heading  Electrical  Instruments. 

1192.  BELL,  Electric,  loud  ringing,  for  outside  service;  entirely  moisture  proof;  operates  on  110  volt, 
60  cycle,  A.  C.  6  inch  gong 12.90 

1196.  ELECTRIC  BELL  OUTFIT,  consisting  of  No.  1184A  Bell,  No.  964  Dry  Battery,  No.  1200  Push 
Button,  1  Ib.  (150  feet)  annunciator  wire,  and  staples  for  putting  up 2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


81 


No.  1208. 


No.  1210. 


1198. 
1200. 
1202. 


1206. 


PUSH  BUTTON,  bronze,  with  screw  cap $0.45 

PUSH  BUTTON,  pressed  metal,  with  screw  cap 12 

STAPLES,  Wire,  square  top,  %-inch,  for  bell  wiring.     In  4-oz.  packages Per  package         .11 

BELLOWS.  Hand,  see  No.  1380. 

BINS  and  CONTAINERS 


1208. 


1210. 


BIN  or  Container,  strongly  made  of  heavy  galvanized  steel  with  hinged  cover  and  with  angle 
steel  reinforcements  and  legs,  the  bottom  of  the  can  being  4  inches  from  the  floor.  Size  22 
inches  by  30  inches  high 24.00 

BINS  or  Containers,  made  of  galvanized  iron,  air  and  water-tight,  with  outside  fitting  cover; 
has  a  heavy  steel  band  top  and  bottom,  the  lower  one  riveted  through  body  and  bottom; 
concave  bottom  raised  1*4  inches  from  ground;  drop  handles. 

Xo A  B  C 

Size,  inches 14^x24     16x26      19x28 

Capacity,  gallons 17  22  32 

Each    5.40  6.00          7.20 

BINS  or  Containers,  of  galvanized  steel  fitted  with  wheels  and  handles  for  wheeling  about. 
Very  convenient  in  transporting  soils  or  grains  from  one  part  of  the  laboratory  to  another. 
With  cover. 

No A  B 

Size,  inches 16x26      19x28 

Capacity,  gallons 22  32 

Each   .'. .. 8.00         9.60 

BIN  or  Container,  of  heavy  galvanized  iron,  with  handles  and  cover:  will  hold  half -bushel  of 

soil  or  grain 1.60 

BIT  BRACE.  Plain,  malleable  iron  socket  and  shell,  forged  steel  jaws,  8-inch  sweep 2.50 

BIT  BRACE,  Ratchet,  with  ball  bearing  head.     Ratchet  design  is  new  and  unique;  the  pawls  are 

strong  and  positive  in  action;  8-inch  sweep 3.75 

F1931.  BLADDER,  prepared  and  cleaned.     For  use  with  bladder  glasses  to  show  bursting  by  atmos- 
pheric pressure .11 


1212. 

1214. 
1216. 


82 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1222. 


BLOOD  TESTING  APPARATUS 


ABDEEHALDEN  EEAGENTS 

1219 A.  NINHYDRIN   (Triketohydrindene  hydrate) per  i/10  gram  vial  $1.75 

1219B.  SILK  PEPTONE,  Hoecnst per  gram      .65 

1220.  ALKALI  RESERVE  DETERMINATION  OUTFIT  for  blood  plasma,  consisting  of  nine  sealed 

tubes  of  resistance  glass  containing  standardized  phosphate  solutions  colored  with  phenolsul- 
phonephthalein,  numbered  from  7.0  to  8.6  by  0.2;  one  non-soluble  dialyzing  tube;  one  tube  for 
making  dialyzing  sacs;  one  tube  for  aeration;  one  capillary  nozzle  tube;  and  100  cc  of  phenol- 
sulphonephthalein  in.  0.8  per  cent,  sodium  chloride  indicator  solution.  Complete  in  wooden 
pocket  case  with  directions  for  use.  (See  Archives  of  Internal  Medicine  for  June  3916)  6.00 

1220A.  DIALYZING  TUBES  only  of  No.  1220 per  dozen      .60 

1220B.  GLASS  TUBES  only  of  No.  1220,  for  making  the  dialyzing  sacs per  dozen      .72 

1221.  ALVEOLAR  AIR  TESTING  OUTFIT,  consisting  of  a  set  of  8  sealed  glass  tubes  of  resistance 

glass  containing  standardized  phosphate  solution  colored  with  phenolsulphonephthalein  and 
numbered  from  10  to  45  mm  by  5  mm;  one  long  non-soluble  glass  test  tube;  one  non-soluble 
glass  capillary  nozzle;  one  metallic  comparison  box  to  hold  the  specimen  and  two  color  tubes; 
one  1000  cc  rubber  bag;  one  rubber  bulb;  one  pinchcock;  one  glass  mouthpiece;  and  100  cc 
of  standardized  sodium  bicarbonate  indicator  solution,  in  wooden  pocket  case  with  directions 
for  use.  (See  Journal  of  American  Medical  Association  Vol.  LXVI,  pages  1594-1596,  for 
May  20,  1916) 7.80 

1222.  CAPSULES,  Wright's,  for  collecting  small  amounts  of  blood,  which  may  then  be  sealed  until 
i  required  for  use per  dozen      .30 

1223.  CARBON  DIOXIDE  APPARATUS,  Fredericia,  for  the  determination  of  the  percentage  of  car- 

bon dioxide  in  alveolar  air  as  an  indication  of  acidosis  of  the  blood.  A  simple  device  for  the 
collection  of  the  alveolar  air  and  the  direct  estimation  of  the  carbon  dioxide  percentage  with- 
out the  use  of  more  elaborate  gas  analysis  apparatus.  Complete  as  illustrated,  mounted  on 
fiber  board  support.  (See  J.  J.  E.  Macleod,  Journal  of  Laboratory  and  Clinical  Medicine  for 

April  1916) 17.00 

1223A.  GLASS  PARTS  only  of  No.  1223 12.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


83 


No.  1225. 


No.  1226. 


No.  1234. 


No.  1224. 


No.  1232. 


No.  1230. 


No.  1228. 


1224.  CARBON  DIOXIDE  APPARATUS,  Van  Slyke,  for  the  determination  of  carbon  dioxide  and 

carbonates  in  blood  plasma  and  other  solutions,  designed  by  Dr.  Donald  D.  Van  Slyke  of  the 
Rockefeller  Institute  for  Medical  Research.  With  this  apparatus,  a  determination  requires  only 
a  few  minutes  for  completion  and  may  be  made  with  1  cc  or  less  of  blood  plasma.  With  up- 
per part  of  pipette  graduated  to  1  ce  in  0.02  cc  divisions.  Complete  on  stand  with  leveling 
bulb  and  connecting  tube,  separatory  funnel,  two  glass  pipettes  and  with  directions  for  use. 

(See  Journal  of  Biological  Chemistry,  Vol.  XXX,  No.  2,  for  June  1917,  page  347) $21.00 

1224A.  GLASS  PARTS  only  of  No.  1224 15.00 

CENTRIFUGES  for  Blood  Testing,  see  general  heading  Centrifuges. 

1225.  COAGULATORS  for  Blood  Serum,  or  Inspissators,  of  copper,  double  walled,  heavily  tinned  on 

the  inside.  The  outside  is  covered  with  insulating  material  and  the  top  with  heavy  felt.  Sup- 
ported on  four  legs,  the  two  in  front  being  adjustable  in  height  for  tilting  at  any  desired 
angle.  Complete  with  water  level,  drip  cock  and  tubulatures  for  thermometer  and  thermo- 
regulator. 

No A  B 

Length  inside,  inches 12  16 

Width  inside,  inches 10  8 

Depth  inside,  inches 2%          2% 

Each    30.00      33.00 

1226.  COAGULOMETER,  Biffi-Brooks,  for  the  coagulation  test  of  blood.    Requires  but  a  few  moments 

for  the  determination,  is  accurate  and  readily  portable.     With  thermometer  and  directions 

for  use   ! 8.00 

1228.     COAGULOMETER,  Brodie-Russell-Boggs,  for  use  on  the  microscope  stage  for  determining  the 
exact  time  for  coagulation  of  the  blood.     (See   Johns   Hopkins    Hospital    Bulletin    for   June- 
July,   1907) 9.50 

1230.  COAGULOMETER,  Rudolf's,  consisting  of  a  pint  Thermos  bottle,  with  a  three-hole  rubber  stop- 
per. Through  two  holes  are  brass  tubes  7  inches  long,  in  which  are  inserted  thin  glass  tubes 
1.5  mm  in  diameter  and  about  7  inches  long,  each  containing  blood  from  the  same  drop.  The 
outer  ends  of  the  tubes  are  sealed  with  a  flame.  A  thermometer  is  placed  in  the  third  hole  of 
the  stopper.  Complete  with  wooden  support  for  Thermos  bottle.  (See  American  Journal  of 

the  Medical   Sciences  for  1910,  Vol.   CXL,  page  807;  1911,  Vol.  CXLII,  page  481) 9.50 

1232.    COLLECTING  NEEDLES,  Wassermann,  for  obtaining  blood  for  investigation.     With  knurled 

finger  grip  to  facilitate  insertion Each.  .15 

Per  dozen     1.50 

1234.  COLLECTING  TUBES,  Keidel's  Vacuum,  consisting  of  a  5  cc  bulb,  drawn  out  to  a  capillary  tip 
and  sealed  after  a  vacuum  has  been  created  by  heating,  a  25  gage  hose-hub  needle,  a  piece 
of  rubber  tubing  for  connecting  needle  and  bulb  and  a  glass  tube  for  protection  during  steril- 
ization. Complete  as  illustrated Each  .25 


C 
16 
14 

38.00 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  1251. 


No.  1250. 


No.  1236. 


Thoma  Ruling. 


No.  1254. 


COLORIMETERS  for  Blood  Testing,  see  general  heading  Colorimeters. 

1236.  CULTURE  TUBE,  Keidel  Vacuum,  for  Blood,  modified  by  Judd  and  Simon  for  culture  work. 
Consists  of  a  tube  with,  a  capacity  of  50  cc  drawn  out  to  a  capillary  tip,  into  which  is  intro- 
duced 15  to  25  cc  of  glucose  bouillon  containing  1.5  cc  of  sodium  citrate.  The  tube  is  then 
exhausted  and  sealed.  Complete  with  a  24  gage  hose-hub  needle  with  stylet,  heavy  walled 
rubber  connecting  tubing,  and  a  glass  tube  for  protection  during  sterilization,  filled  and  sealed 
ready  for  use $0.75 

1246.  HAEMACYTOMETER,  Fuchs-Rosenthal,  for    cytological    investigations    of    the    cerebro-spinal 

fluids,  with  counting  chamber  0.2  mm  deep,  with  two  cover  glasses   and  one   mixing   pipette 
for  white  corpuscles,  in  leather  ease 10.00 

1247.  COUNTING  CHAMBER  only  of  No.  1246,  with  two  cover  glasses;  without  case 6.00 

1250.  HAEMACYTOMETER,    Levy,    Burker-Neubauer,   with   Biirker   double   counting   chamber  with 

two  Neubauer  rulings,  complete  with  two  cover  glasses,  one  pipette  for  red  and  one  for  white 
corpuscles,  in  leather  case. 

This  new  type  of  counting  chamber  (patented)  differs  from  the  old  Biirker  chamber  in  that 
a  depression  is  cut  into  the  slide  itself,  instead  of  having  two  parallel  pieces  of  glass  ce- 
mented on  the  slide  across  its  entire  width,  thus  doing  away  with  the  danger  of  loosening  of 
the  sides  of  the  cell  with  the  drying  out  of  the  balsam  cement.  In  the  center  of  this  depres- 
sion are  permanently  fixed  two  rectangular  pieces  of  glass,  separated  by  a  small  moat,  each 
ruled  with  the  Neubauer  ruling.  The  surfaces  of  these  rectangles  are  exactly  Vioth  milli- 
meter below  that  of  the  slide,  thus  providing  a  solution  over  the  ruled  area  of  the  correct 
depth  when  the  slide  is  in  place.  The  double  chamber  enables  both  red  and  white  corpuscles 
to  be  counted  at  the  same  time,  without  cleaning  and  refilling  the  counting  chamber..  18.00 

1251.  COUNTING  CHAMBER  only  of  No.  1250,  with  two  cover  glasses;  without  case 10.00 

1252.  COVER  GLASS  only  of  No.  1250,  size  20x26  mmxO.5  mm  thick 30 

1253.  HAEMACYTOMETER,  Levy,  Burker-Neubauer,  same  as  No.  1250,  but  with  Bureau  of  Stand- 

ards certificate  for  counting  chamber  and  pipettes •. 24.00 

1254.  HAEMACYTOMETER,  Thoma,  with  counting  chamber  with  original  Thoma  ruling,  two  cover 

glasses,  one  pipette  for  red  and  one  for  white  corpuscles,  in  leather  case 12.00 

1255.  COUNTING  CHAMBER  only  of  No.  1254  with  two  cover  glasses;  without  case 6.00 

1258.  HAEMACYTOMETER,  Turk,  with  counting  chamber  with  Turk  ruling,  two  cover  glasses,  one 

pipette  for  red  and  one  for  white  corpuscles,  in  leather  case 13.50 

1259.  COUNTING  CHAMBER  only  of  No.  1258,  with  two  cover  glasses,  without  case 7.50 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


85 


No.  1278. 


No.  1277. 

1262,  HAEMACYTOMETER,  Zappert-Ewing,  with  counting  chamber  with  Zappert-Ewing  ruling,  two 

cover  glasses,  one  pipette  for  red  and  one  for  white  corpuscles,  in  leather  ease $13.50 

1263.  COUNTING  CHAMBER  only  of  No.  1262,  with  two  cover  glasses;  without  ease 7.50 

1266.  MIXING  PIPETTE,  Thoma,  for  red  corpuscles,  for  dilution  in  the  ratio  of  1  to  100,  with  rubber 

tubing  and  mouthpiece 2.00 

1267.  MIXING  PIPETTE,  Thoma,  for  white  corpusles,  for  dilution  in  the  ratio  of  1  to  10,  with  rubber 

tubing  and  mouthpiece 2.00 

1270.     COVER  GLASS  for  Counting  Chamber,  square,  polished,  0.4  mm  thick 50 

1272.  CASE  for  Counting  Chamber,  of  leather,  velvet  lined 1.00 

1273.  CASE  for  Complete  Haemacytometer,  of  leather,  velvet  lined 2.40 

HAEMATOCRIT,  Daland,  see  Centrifuge  Accessories. 

1277.  HAEMOGLOBINOMETER,  Haessler  -  Newcomer,  for  rapidly  and  accurately  estimating  haemo- 

globin in  blood.  The  outfit  consists  of  an  open  tube  for  the  specimen  under  test,  together  with 
11  sealed  color  tubes  containing  stable  artificial  color  .standards,  graded  in  multiples  of  ten. 
These  standards  are  mounted  in  a  hardwood  rack  with  holes  between  them  for  the  insertion  of 
the  specimen  tube.  By  the  use  of  the  interrupted  series  of  standards,  the  color  may  be  more 
easily  and  accurately  matched  than  with  a  uniformly  graded  scale.  Complete  as  described  with 
specimen  tube  and  color  standards  in  hardwood  carrying  case.  (See  Archives  of  Internal  Medi- 
cine for  June  1916,  pages  806-808) 7.20 

1278.  HAEMOGLOBINOMETER,  Tallquist,  consisting  of  a  color  scale  of  10  tints,  ranging  from  10%  to 

100%,  bound  in  book  form,  pocket  size,  with  50  sheets  of  absorbent  paper  sufficient  for  150  tests. 
"With  directions  for  use 1.75 

1280.  HAEMOMETER,  Sahli,  with  Kuttner  Haemoglobin  Standard,  the  color  of  which  maintains  its 

permanency.  Complete  with  carefully  calibrated  and  tested  color  tube  and  pipette,  hard 
rubber  stand  for  tubes,  and  hard  rubber  container  for  blood  specimen  with  vial  and  rubber 
stopper,  in  case  with  directions  for  use 7.00 

1281.  HAEMOGLOBIN  STANDARD,  Kuttner,  for  No.  1280 2.00 

1282.  GRADUATED  TUBE,  140  cmm,  for  No.  1280 1.50 

1283.  GRADUATED  PIPETTE,  20  emm,  for  No.  1280 1.00 


86 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  1286. 


No.  1290. 


No.  1292. 


No.  1296. 


No.  1308. 


1286.  HYDROGEN-ION  CONCENTRATION  APPARATUS  for  determining  the  hydrogen-ion  content  of 
the  blood  colorimetrically,  ai  suggested  by  Drs.  Levy,  Eountree  and  Marriott.  The  outfit  con- 
sists of  a  series  of  standard  colored  liquids  sealed  in  glass  tubes,  a  wooden  holder  for  the  tubes 
and  a  comparison  box  for  matching  the  color  of  the  unknown  with  the  standard  colors.  Com- 
plete in  wooden  case  I%x4xll%  inches.  (See  Archives  of  Internal  Medicine,  Vol.  XVI,  for 
September  1915,  page  389) $5.50 

1290.  LANCET,  Blood,  with  nickel-plated  metal  handle  into  which  the  lancet  can  be  screwed  for  pro- 
tection   : 60 

1292.     LANCET,  Blood,  same  as  No.  1290,  but  with  hard  rubber  handle 45 

1296.  LANCET,  Blood,  Spring,  in  nickel-plated  handle  with  spring  clamp,  and  screw  to  adjust 
depth  3.00 

MICROSCOPES  for  Blood  Testing,  see  general  heading  Microscopes. 

1308.  MICRO-SACCHARIMETER,   Epstein's,  for  the  estimation  of  sugar  in  the  blood,  making  use  of 

the  color  change  brought  about  by  heating  a  mixture  of  sugar  and  picric  acid  in  the  pres- 
ence of  sodium  carbonate,  the  depth  of  the  color  depending  on  the  amount  of  sugar  present. 
With  this  apparatus  an  accurate  determination  may  be  made  with  as  small  an  amount  as  0.1 
cc  of  blood.  Complete  with  two  standard  color  tubes,  an  accurately  graduated  tube  for  the 
unknown,  holder  with  opaque  glass  slide  for  the  color  tubes,  pipette  graduated  to  1  cc  in 
0.1  cc  divisions,  capillary  pipette  graduated  at  0.1  and  0.2  cc,  tube  graduated  at  1  and  2.5 
cc,  two  boiling  tubes  with  holder,  filtering  funnel,  dropper,  and  set  of  three  solutions — picric 
acid,  sodium  carbonate,  and  sodium  fluoride,  in  ease  with  directions  for  use 9.00 

1309.  STANDARD  COLOR  TUBES. 

No A  B 

Each   1.00        1.00 

1310.  GRADUATED  TUBE,  for  blood  serum 1.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


87 


No.   1322. 


No.  1364. 


No.  1346. 


1311.  BOILING    TUBE    $0.05 

1312.  TUBE,  graduated  at  two  marks,  1  and  2.5  cc 25 

1313.  PIPETTE,  with  two  marks,  0.1  and  0.2  cc,  with  rubber  tube  and  mouth-piece 50 

PIPETTE,  Mohr's,  1  cc  in  i/10,  graduated  to  the  tip,  see  No.  10496. 

FUNNEL,  Filtering,  see  No.  6112. 
DEOPPEE,  see  No.  10476. 

1314.  PICEIC  ACID  SOLUTION,  saturated,  125  ec  in  glass  stoppered  bottle .75 

1315.  SODIUM   CAEBONATE.    10%   solution,   125  cc  in  glass  stoppered  bottle 25 

1316.  SODIUM  FLUOEIDE,   2^  solution,  30  cc  in  glass  stoppered  bottle 40 

NEEDLES,  Blood,  see  Lancets. 

1320     PIPETTE,  Comer  Automatic,  for  vaccines,  etc.,  designed  to  deliver  exactly  1  cc,  with  reservoir 

to  hold   excess 1.00 

PIPETTES,  Wassermann,  see  Xo.  10506. 
1322.     PIPETTE,  Wright's  Blood,  of  soft  glass  with  end  shaped  to  take  rubber  tube,  and  with  point 

carefully  drawn  to  capillary  tip.     Length  over  all,  7%  inches .20 

1324.     PIPETTE,  Wright's  Looped,  for  use  in  measuring  the  bactericidal  power  of  the  blood 50 

SPECTEOSCOPES  for  Blood,  see  general  heading  Spectroscopes. 

1346.  SPHYGMOMANOMETEE,  Eoger's  Tycos  Aneroid,  complete  with  indicator,  patent  arm  sleeve 
and  inflating  bulb  with  control  valve,  in  morocco  carrying  case,  5^2x31^x214  inches,  with  di- 
rections for  use 25.00 

SYRINGES  for  Blood  Testing,  see  general  heading  Syringes. 

1354.  UEEA  APPAEATUS,  Marshall's  for  Blood,  consisting  of  three  200  cc  Erlenmeyer  flasks  with 

two-hole  rubber  stoppers,  two  glass  cylinders  12x2  inches  with  two-hole  rubber  stoppers,  one 
Drechsel  gas  washing  bottle,  two  calcium  chloride  tubes  with  one-hole  rubber  stoppers,  one  No. 
5476A  Filter  Pump,  three  special  Folin  absorption  tubes,  with  necessary  connecting  tubes  of 
glass  and  rubber,  complete  as  illustrated,  without  supports.  (See  Journal  of  Biological 
Chemistry,  Vol.  XV,  No.  3,  for  September  1915)  6.00 

1355.  FOLIN  TUBES  only  of  No.  1354,  with  perforated  bulbs each        .30 

1356.  BULB  CONNECTING  TUBES  only  of  No.  1354    each        .30 

1357.  GLASS  CONNECTING  TUBES  only  of  No.  1354,  L  shape,  long,  for  use  in  cylinders,  .each        .10 

1358.  GLASS  CONNECTING  TUBES,  L  shape,  short,  for  connecting  flasks  of  No.  1354... each        JO 
WASSEEMANN  BATHS,  see  Water  Baths. 

WASSEEMANN  PIPETTES,  see  Pipettes  No.  10506. 
WASSEEMANN  TUBES,  see  Test  Tubes  No.  13390. 
1364.     WET  CUP,  Blackfan,  of  glass,  for  procuring  blood   from   children 2.00 


88 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1374. 


No.  1382. 


No.  1388. 


No.  1376. 


No.  1380. 


BLOWERS 

1374.   BLOWERS,  Foot,  Fletcher's,  portable;  give  a  steady  and  powerful  blast. 

No !>  9A  9B 

Diameter  of  air  reservoir,  inches 7%                9  11 

Pressure  obtainable,  per  inch,  pounds 1  I1/.,  1% 

Capacity,  per  hour,  cubic  feet 190  330  625 

Each $7.50  9.90  14.60 

1376.  BLOWERS,  Foot,  Fletcher's,  mounted  on  legs  with  rubber  reservoir  underneath,  thus  obviating 

the  risk  of  injury.     Specifications  are  same  as  given  under  No.  1374. 

No 10  10A  10B 

Each 8.70  11.40  17.40 

1377.  RUBBER  DISKS  for  Nos.  1374  and  1376  Blowers. 

Adapted  to  Nos 9  &  10  9A  &  10A  9B  &  10B 

Diameter,  inches 9%  11%  14*4 

Each .40  .70  1.00 

1378.  NETS  for  Nos.  1374  and  1376  Blowers Each        .45 

1380.   BLOWER,  Hand  Bellows,  7  inches  in  diameter 90 

1382.    BLOWER,  Hand,  of  rubber,  two  bulbs,  one  covered  with  net  for  constant  pressure 1.00 

BLOWERS  FOR  POWER  USE 

1388.  BLOWERS,  Hot  Air,  electrically  operated,  for  producing  a  constant  stream  of  hot  air;  useful 
for  quickly  drying  glassware  such  as  large  flasks,  etc.,  also  for  promoting  evaporations. 
Complete  with  double  switch,  one  for  blast  at  room  temperatures,  the  ether  for  hot  air,  and 
with  cord  and  plug  for  attaching  to  lamp  socket. 

No A  B  C  D 

A.C.  D.C. 

For  voltage 110         220         110         220 

Each    1T.50       18.25  17.50       18.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


89 


No.  1398. 


No.  1400. 


1398. 


BLOWER  AND  VACUUM  PUMPS,  Cenco  Rotary,  Electrically  Driven,  for  producing  a  blast  for 
the  operation  of  blast  lamps  and  for  use  with  other  laboratory  devices  requiring  moderate  air 
pressure  or  vacuum.  The  blowers  are  of  small  size,  very  compact,  and  with  few  parts.  They 
are  free  from  mechanical  troubles  and  require  practically  no  attention,  except  an  occasional 
oiling.  They  are  mounted  on  a  cast  iron  base,  direct  connected  to  an  electric  motor,  and  are 
connected  with  a  variable  rheostat  by  means  of  which  the  speed  and  therefore  the  air  pressure 
can  be  varied.  A  snap  switch  is  mounted  on  the  same  base  for  starting  and  stopping  the  motor. 


Specifications : — 


Number  of  blast  lamps  operated  simultane- 
ously, 2. 

Vacuum  at  maximum  speed,  17  inches  of 
mercury. 

Power  consumption,  50  watts. 


Size  of  base,  8%  x  8  inches. 

Height  over  all,  4]/4  inches. 

Range  of  speed,  600  to  2000  r.  p.  m. 

Pressure  at  maximum  speed,  8  pounds  per 

square  inch. 
Cubic  feet  of  air  per  minute,  0.75. 

Complete  as  described  with  blower,  motor,  rheostat  and  snap-switch  mounted  on  base  with  5  feet 
of  cord  and  plug  for  attachment  to  any  lamp  socket. 

No A  B  C  D 

A.C.  B.C. 

For  volts  110  220  110  220 

Each    $40.00  45.00  40.00  45.00 

1399.  BLOWER  AND  VACUUM  PUMP  only  of  No.  1398,  with  grooved  pulley,  but  without  base,  motor 

or  other  accessories 12.00 

1400.  BLOWER  AND  VACUUM  PUMPS,  Cenco  Rotary,  Electrically  Driven,  similar  to  No.  1398,  but 

of  larger  size  and  capacity,  with  constant  speed  motor. 


Specifications : — 

Size  of  base,  13  x  7%  inches. 
Height  over  all,  7%  inches. 
Speed,  1725  r.  p.  m. 
Pressure,  10  pounds  per  square  inch. 
Cubic  feet  of  air  per  minute,  1.4. 

Complete  as  described,  with  blower  and  %  h.  p.   direct   connected  motor   mounted  on   cast   iron 
base,  but  without  rheostat,  switch,  or  connecting  cord. 

No A  B  C                  X> 

A.C.  D.C. 

For  volts  110  220  110  220 

Each   60.00  62.50  50.00  52.50 

1401.     BLOWER  AND  VACUUM  PUMP,  only  of  No.   1400,  with  grooved  pulley,  but  without  base  or 
motor.  . : 15.00 


Number  of  blast  lamps  operated  simultane- 
ously, 4. 

Vacuum,  20  inches  of  mercury. 
Power  consumption,  175  watts. 


90 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  1402. 


No.  1390. 


No.  1403. 


1390.  BLOWER,  Automatic  Electric  Air  Compressor  and  Exhaust  Pump  Combined.  Provided  with 
switch  for  automatic  starting  and  stopping  of  the  motor  at  variations  of  pressure.  This  switch 
operates  only  when  the  pump  is  used  for  pressure  and  the  tank  is  connected  only  with  the 
pressure  outlet  of  the  pump.  Suction  is  obtained  by  attaching  a  tube  to  a  hose  nipple  at  the 
base  of  the  cylinder.  Complete  with  four  gallon  tank,  pressure  gage  and  motor  compactly 
mounted  on  one  base,  9%x32  in. 


Bore,  in  ........................  1% 

Stroke,  in  ......................  2% 

Free  air  per  minute  at  200  r.  p.  m., 

eu.  ft  ........................  1% 


No 

For  volts 

Size  of  motor,  h.  p 

Each  . 


For  pressure  up  to,  Ibs •. .  40 

Vacuum  up  to,  in 26 

Height  over  all,  in 25% 

Weight,  Ibs 92 

ABC 

110A.C.  110  D.C.  220  B.C. 

%  %  % 

$89.00  75.00  77.00 


1396.  TANK,  of  heavy  galvanized  iron,  12  gallons  capacity,  with  50  Ib.  pressure  gauge,  petcock  on 
upper  end  and  two  %  in.  iron  pipe  size  bushings  in  the  side  for  making  connections.  Dimen- 
sions over  all,  diameter  12  in.;  height,  30  in 10.00 

1402.  BLOWER  and  VACUUM  PUMP,  Crowell  Rotary  (No.  0-D).     This  pump  is  used  principally  for 

vacuum  work,  giving  from  29  to  30  in.  of  mercury,  according  to  atmospheric  conditions.  It  is 
fitted  in  an  oil  immersion  box,  which  makes  it  practically  leak-proof.  Capacity  about  2  cu.  ft. 
of  free  air  per  minute.  Inlet  and  outlet  tapped  for  %  in.  pipe  size.  Requires  about  %  h.  p. 
to  operate  , 65.00 

1403.  BLOWER  and  VACUUM  PUMP,  Crowell  Rotary.     Same  as  No.  1402,  but  without  the  oil  immer- 

sion box    52.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


91 


No.  1406  (3-A  &  4- A). 


No.  1408. 


1406.  BLOWER  and  VACUUM  PUMPS,  Crowell  Type  A.  Adapted  for  all  purposes  requiring  air  under 
pressure  of  from  1  to  10  Ibs.  to  the  square  inch  and  any  degree  of  vacuum  not  exceeding  24  in. 
The  pressure  is  not  dependent  upon  high  speed  or  centrifugal  force.  There  are  no  springs, 
gears,  valves  or  unbalanced  parts.  Satisfactory  for  furnishing  vacuum  or  pressure  throughout 
the  laboratory.  Air  receivers  are  usually  not  required,  but  are  of  advantage  where  a  close 
regulation  of  the  pressure  is  desirable.  (See  No.  1410.) 


No. 


1-A 

20 


Cu.  in.  free  air  per  revolution , 

Cu.  ft.  free  air  per  min.  at  maximum 

speed    6.9 

R.  p.  m.  at  maximum  speed ,  600 

Approx.  h.  p.  at  3  Ibs.  pressure % 

Pulleys,  in 4x1 

Net  weight,  Ibs 24 

Pipe  size,  inlet  and  outlet,  in y2 

Floor  space,  in 10x6^4 

Each,  without  air  receiver $26.00 


2-A 

45 

13 

500 

% 

4x1% 
34 


34.00 


3-A 

125 

25.3 
350 

% 

6x2% 
90 
1 

22x14 
53.00 


4-A 
280 


5-A 
460 


40.5 

53.2 

250 

200 

1 

1% 

9x3 

10x3 

170 

225 

1% 

2 

28x17 

34x20 

60.00 

100.00 

1408. 


BLOWER  and  VACUUM  PUMPS.  Crowell  Type  D.  For  pressures  up  to  25  Ibs.  per  square  inch 
and  vacua  from  29  to  30  in.  of  mercury.  The  system  of  lubrication  is  positive  and  auto- 
matically controlled  by  the  air  pressure.  The  heads  are  provided  with  water  jackets  for  cool- 
ing. Construction  throughout  is  heavier  than  Type  A,  adapting  this  type  for  heavier  duty. 
(For  Air  Receivers  see  No.  1410.) 


No. 


1-D 
15 


Cu.  in.  free  air  per  revolution 

Cu.  ft.  free  air  per  minute  at  maximum 

speed    4.3 

R.  p.  m.  at  maximum  speed 500 

Approx.  h.  p.  at  15  Ib.  pressure  or  29  in. 

vacuum    % 

Pulleys,  in 6x2 

Approx.  net  weight,  Ibs 70 

Pipe  size,  inlet  and  outlet,  in % 

Floor  space,  in 13x18 

Each,  without  air  receiver 75.00 


2-D 
40 

9.2 
400 

1 

8x2 
115 

% 

14x22 
88.00 


3-D 
100 

17 
300 


12x4 

250 

1 

19x34 
118.00 


4-D 

280 

40.5 
250 

4 

14x4 

425 

1% 

23x38 

198.00 


5-D 

400 

46 
200 

5 

18x6 

580 

2 

26x44 
225.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1410. 


No.  1414. 


No.  1436. 


No.  1415. 


1410.     AIR  RECEIVERS  for  Nos.  1406  and  1408,  which  can  be  set  to  blow  off  at  any  desired  pressure 
by  turning  the  adjusting  nut. 


No 

For  Blower  No 

Height,  inches   

Length,  over  all,  inches 

Diameter,  inches  

Capacity,  gallons    

Net  weight,  Ibs 

Pipe  size,  inlet  and  outlet,  inches. 
Each  


1 

2 

3 

4 

5 

1-AorD 

2-A  or  D 

3-A  or  D 

4-A  or  D 

5-A  or  D 

12 

12 

20 

24 

24 

18 

18 

26 

30 

32 

8 

8 

10 

10 

12 

2.6 

2.6 

6.8 

8 

11.7 

15 

15 

28 

32 

S3 

% 

% 

1 

1'i 

o 

$12.00 

12.00 

14.50 

16.50 

20.00 

BLOWERS  OPERATED  BY  WATER  PRESSURE 

1414.  BLOWER,  Muencke's,  operated  by  water  blast   for  either  compressing  or  exhausting.     With  30 

pounds  pressure  it  will  run  two  ordinary  sized  blast  lamps.  Intended  for  connecting  to 
water  supply  by  rubber  tubing.  Complete  with  one  Filter  Pump  No.  5476,  zinc  water 
chamber  4x8  inches,  air  outlet  and  stopcock  for  regulation 12.50 

1415.  BLOWER,   Muencke's,   same   as  No.   1414  but   with   vacuum    gage   to   indicate    amount   of   va- 

cuum  .  20.00 


BLOWPIPES 

1430.    BLOWPIPES,  of  brass,  plain. 

Length,  inches 8               10  12 

Each. 20            .25  .30 

1432.  BLOWPIPES,  of  brass,  with  air  chamber. 

Length,  inches 8               10  12 

Each 35             .45  .50 

1433.  BLOWPIPE  MOUTHPIECE,  of  wood  to  fit  blowpipes  Nos.  1430  and  1432 Each  .15 

Per  dozen  1.50 

1436.     BLOWPIPE,  Berzelius  Form,  of  brass,  with  hard  rubber  mouthpiece  and  platinum  plate  placed 

on  end  of  jet.     Can  be  taken  apart 2.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


No.  1454. 


1438.  BLOWPIPE,  Black's,  japanned  tin,  removable  brass  tip.     Length,  8%  inches $0.20 

1439.  BLOWPIPE  TIPS  for  No.  1438 Per  dozen      1.00 

1442.    BLOWPIPE,  Black's,  new  form,  of  brass,  with  removable  tip  that  unscrews  and  wooden  mouth- 
piece.    Length,  S1/^  inches • .70 

1444.    BLOWPIPE,  Brazing,  of  brass  with  stopcocks  for  air  and  gas.    Requires  %  inch  gas  supply.    Size 

of  air  tube,  $i6  inch;  of  gas  tube,  %6  inch;  length  over  all,  14  inches 3.00 

1446.     BLOWPIPE,  Fletcher's  Hot  Blast,  of  brass.    Length,  10%  inches 80 

1448.  BLOWPIPE,  General  Laboratory,  of  brass  nickel-plated.  The  most  convenient  form  of  hand 
blowpipe  or  blast;  of  very  light  weight.  Provides  intensely  hot  flame,  which  is  easily  regu- 
lated in  size  and  intensity  from  the  finest  needle  flame  to  a  large  brush,  by  means  of  stop- 
cocks on  the  air  and  gas  tubes.  Especially  valuable  in  sealing  glass  and  in  repairing  large 
pieces  not  easily  handled.  Total  length,  9  inches;  weight,  4%  ounces 5.00 

1450.  BLOWPIPE,  Oxy-Hydrogen,  all  brass,  on  stand,  with  removable  lime  cylinder  holder  and  two 

stop-cocks    8.00 

1451.  BLOWPIPE  only  of  No.  1450 7.00 

1454.  BLOWPIPE,  Planner's,  of  brass  nickel-plated,  with  hard  rubber  mouthpiece,  but  without  plati- 

num tip    1.70 

1455.  BLOWPIPE  TIP,  of  Platinum,  for  No.  1454,  seamless,  with  small  uniform  hole.    Price  depend- 

ent upon  the  market  price  of  platinum. 

1458.  BLOWPIPE,  Plattner's,  brass,  with  hard  rubber  mouthpiece,  fitted  with  side  arm  with  stop-cock 
for  attaching  directly  to  gas  supply,  giving  a  very  powerful  blowpipe  flame 3.00 

BLOWPIPE  APPARATUS 

BLOWPIPE  TIPS  for  burners,  see  Nos.  2228  and  2230. 
BUNSEN  BUENEB  for  blowpipe  work,  see  general  heading  Burners. 

1464.  BUTTON  BRUSH 60 

1466.  CARBON  BLOCK,  molded 65 

1467.  CARBON  BLOCK  HOLDER .36 

1468.  CARBON  CYLINDER,  molded,  I%x3  inches .55 

1470.  CHARCOAL  BORER,  club  shape 1.00 

1472.  CHARCOAL  BORER,  four  cornered 70 

1474.  CHARCOAL  HOLDER,  with  platinum  wire  and    shield 3.00 

1476.  CHARCOAL  SQUARES,  with  covers,  for  charcoal  holder Each       .40 

1478.  CHARCOAL  STICKS,  natural  willow  wood,  4xlx%  inches Per  dozen       .50 

1480.  CLAY  CAPSULES Per  dozen      .60 

1482.  CLAY  CRUCIBLES Per  dozen      .70 

CUPELS,  Bone  Ash,  see  No.  3628. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


1484. 
1486. 

1488. 
1490. 
1492 
1494. 
1496. 
1498. 
1500. 

1502. 
1504. 

1506. 
1508. 
1510. 
300. 
1514. 
1516. 
1518. 


No.  1518. 

CUPEL  HOLDEK,  on  wooden  support,  -with    two    molds    and    stamp    of    brass,    nickel-plated. 

Height,  about  3y2  inches $2.00 

FORCEPS,  Blowpipe,  nickel-plated,  with  platinum  tips.  Length  5%  inches.  Price  dependent 
upon  market  price  of  platinum. 

HAMMER,  Plattner's,  wooden  handle 45 

LAMP,  of  polished  brass 1.25 

MATRASSES,  Glass,  flask  shape per  dozen       .72 

MATRASS   HOLDER 40 

MINERALS  for  Blowpipe,  25  specimens,  small  size,  in  partitioned  hardwood  box 2.00 

MINERALS  for  Blowpipe,  50  specimens,  small  size,  each  in  tray,  all  enclosed  in  oak  box. .       3.00 
MINERALS  for  Blowpipe,  100  specimens,  including  all  but  the  very  rarest,  each  in  tray,  all  en- 
closed in  oak  box 7.50 

PLATINUM  WIRE,  with  solid  glass  handle,  for  borax  beads,  etc 85 

PLATINUM  GOODS,  see  general  heading  Platinum  Ware. 

REAGENTS,  set  of  14  one-ounce  bottles  filled  with  chemically  pure  blowpipe  reagents,  accord- 
ing to  Fresenius 4.50 

SCALE,  Plattner's,  of  ivory,  for  silver  beads 3.50 

SCALE  of  Hardness,  without  diamond,  9  specimens 2.00 

SILVER  FOIL per  ounce     2.00 

STREAK  PLATE,  unglazed  porcelain,  60x100x4  mm  thick 40 

TUBES,  hard  glass,  4x^4  inches,  open  at  both  ends per  dozen        .45 

TUBES,  hard  glass,  4xJ/i  inches,  closed  at  one  end ' per  dozen        .90 

BLOWPIPE  SET  of  Apparatus  and  Reagents,  as  designed  by  Prof.  Butler  of  the  Colorado  School 
of  Mines  for  use  in  the  laboratory  and  field.  The  various  pieces  are  compactly  arranged  in  a 
case  with  compartments  and  receptacles,  especially  designed  to  avoid  breakage.  Outside  dimen- 
sions, Il%x6%x2%  inches.  Complete  with  wet  and  dry  fluxes,  and  with  lamps  for  alcohol  and 

oil 22.50 

The  set  contains  the  following  pieces: — 


1520. 


2  Sticks  Charcoal 

6  Open  Tubes 

Large  Test  Tube 

Small  Test  Tube 

Ammonium  Hydrate 

Cobalt  Nitrate 

Hydrochloric  Acid 

Sulphuric  Acid 

Nitric  Acid 

Tin 
POCKET  HAND-BOOK  OF  BLOWPIPE  ANALYSIS,  by  G.  Montague  Butler,  M.  E. .....       1.00 

BOATS,  Combustion,  see  Combustion  Boats. 
BOILERS,  see  Kettles. 
BOLTING  CLOTH,  see  Sieves. 


Blowpipe 

Platinum  Wires  and  Holder 

Combination  Charcoal  Borer, 

Magnet  and  Chisel 
Streak  Plate 
Blue  Litmus 
Red  Litmus 
Anvil 
3  Arsenic  Tubes 


Microcosmic  Salt 

Sodium  Carbonate 

Bismuth  Flux 

Borax 

Potassium  Bisulphate 

Oil  Lamp  (brass) 

Alcohol  Lamp  (brass) 

Hammer 

Platinum  Tipped  Forceps 


CEXTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


95 


Ko.  1536. 


No.  1558. 


No.  1556. 


No.  1538. 


BOTANICAL  APPARATUS 

1530.  BOTANICAL  ABSORPTION  PAPER,  11x16  inches,  as  used  in  No.  1558  Plant  Press.  Heavy 
felt  paper,  very  absorbent per  100  sheets  $3.00 

1532.  BOTANICAL  ABSORPTION  PAPER,  good  quality  blotting  paper,  size,  12x19  inches. 

per  100  sheets    1.50 

1533.  BOTANICAL  ABSORPTION  PAPER,  same  as  No.  1532,  but  in  sheets  19x24  inches. 

per  100  sheets    3.50 

1536.  BOTANICAL  ADHESIVE  TAPE,  in  rolls  of  10  yards,  %  inch  wide,  gummed,  ready  for  use. 
Made  of  white  cloth,  easily  cut  and  readily  applied,  presenting  a  neat  and  inconspicuous 
appearance  on  the  mounting  sheet.  In  box  with  slot  enabling  it  to  be  withdrawn  in  any 

amount   per  roll       3D 

1538.  BOTANICAL  COLLECTING  CASE  (Vasculum),  of  metal,  finely  enameled  in  green,  with  door 
opening  entire  length.  Size  15%x5x7%  inches.  Complete  with  leather  shoulder  strap  and 

snaps     2.00 

1540.  BOTANICAL  GENUS  COVERS,  of  heavy  manila  paper,  with  surface  specially  prepared  for 
writing  upon.  Size  folded.  12x18  inches per  100  sheets  2.00 

1548.  BOTANICAL  MOUNTING  BOARD,  good  quality    Bristol    board,    plain.      Size,    11x17    inches. 

per  100  sheets     3.00 

1549.  BOTANICAL  MOUNTING  BOARD,  same  as  No.  1548,  but  with  printed  form  for  plant  descrip- 

tion.    Size,   11x17   inches per  100  sheets     5.00 

1552.     BOTANICAL  MOUNTING  PAPER,  of  heavy  unsized  stock,  strong  and  durable.     Color  does  not 

deteriorate  with  age.     Size,  11x17  inches per  100  sheets      1.50 

1554.     BOTANICAL  MOUNTING  PAPER,  heavy  weight  paper  of  grayish  color,  unsized  surface.  Size 

11x17  inches .' per  100  sheets      1.10 

1556.  BOTANICAL  MOUNTS.  Riker's,  suitable  for  mounting  any  botanical  specimen.  The  mount 
consists  of  two  parts — a  thin  plate  of  photographic  glass  to  which  narrow  flaps  of  linen 
morocco  paper  are  neatly  fastened,  and  a  cardboard  back  to  which  is  glued  a  thin  layer  of 
sterilized  surgical  cotton  in  which  the  specimens  are  imbedded. 

No A  B  C  D 

Size,  inches 5x6         6%x8%        8x12          12x16 

Each    25  .30  .50  1.00 

Per    dozen 2.80  3.50  6.00  12.00 

For  other  MOUNTS,  see  Specimen  Mounts. 

1358.  BOTANICAL  PLANT  PRESS,  simple,  strong,  portable,  and  satisfactory.  Made  of  lattice  work, 
it  dries  very  rapidly,  especially  when  used  with  No.  1530  Absorption  Paper.  Hung  in  sun- 
light or  over  a  heater,  specimens  can  be  dried  so  rapidly  as  to  preserve  natural  colors.  From 
one  to  fifty  or  more  specimens  may  be  pressed  at  one  time.  Size,  Il%xl6%  inches.  Com- 
plete with  straps  as  illustrated 2.50 


96 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  1560,  Fig.  1. 


No.  1560,  Fig.  2. 


No.  F8841. 


No.  F8847. 


1560. 


1562. 


1564. 


BOTANIC AIi  PLANT  PRESS,  Riker'S,  consisting  of  a  series  of  layers  of  tubular  paper  in 
serted  between  sheets  of  blotting  paper  and  absorbent  cotton  so  that  all  the  moisture  is  freelj 
carried  off  by  a  current  of  hot  air  passing  through  the  tubes.  Fig.  1  represents  a  section 
showing  the  plant  laid  on  the  cotton.  Fig.  2.  The  method  of  confining  the  heat  from  a  lan- 
tern by  a  wrapping  of  paper  dries  the  plants  in  a  few  hours  and  is  adapted  for  camp  or  the 
tropics.  If  hung  above  a  burner  or  placed  in  the  sun  splendid  results  are  also  obtained 
Directions  for  use  accompany  each  press. 

No A  B 

Size,  inches 9x12          12x19 

Each    $2.00  3.25 

BOTANICAL  PRESSING  PAPER,  thin  white  absorbent  paper,  folded  and  cut,  for  use  with 
No.  1530  Absorption  Paper per  100  sheets  .50 

BOTANICAL  SPECIES  COVERS,   of  manila  paper,  size  folded,   Il%xl7%  inches. 

Per  100  sheets 1.50 

HERBARIUMS.  Made  in  two  sizes,  7%x9%  inches,  and  11x17  inches,  uniform  in  design  with 
the  Atlas  Not©  Books.  The  portfolio  form  permits  the  specimens  to  be  mounted  scientifically 
according  to  the  genus  and  species  to  which  they  belong.  The  plan  also  permits  adding  to  or 
removing  from  the  collection  at  any  time.  Hints  on  collecting,  pressing  and  mounting  speci- 
mens are  found  on  inside  cover  pages.  Each  sheet  contains  a  legend  for  classification,  and  an 
index  is  furnished. 


No 

Atlas  No 

Size,  inches  . . 
No.  of  sheets. 


A 

709 
x9 
40 


B 

1117 

11x17 

25 


F8841.  HERBARIUM,  complete,  as  described  above .30  .57 

F8842.  HERBARIUM  COVERS  only Per  set  .12  .20 

F8843.  MOUNTING  SHEETS  only Per  100  .42  1.40 

F8847.  PLANT  DESCRIPTION  PAPER,  with  spaces  on  one  side  for  complete  analysis  of  a  plant;  the 

7%x9%  inches,  perforated  for  Nos.  F8811  or  F8842A  Covers.    In  envelope 


I 


other  side  unruled. 

of  20  sheets '.*. Per   envelope 


.07 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


97 


No.  1574. 


No.  1578. 


No.  1582. 


No.  1584. 


No.  1586. 


BOTTLES  FOR  GENERAL  USE 


1574. 


1576. 


BOTTLES,  narrow  mouth,  round,  flint  glass. 

Capacity,  ounces %         1          2 

To  take  cork  stopper,  No. ..        112 

Number  in  original  case 864      864     720 

Per  dozen 58      .62      .68 

Per  gross  in  original  case. .  $5.50    5.90    6.50 

BOTTLES,  narrow  mouth,  round,  green  glass. 

Capacity,  gallons 

To  take  cork  stopper,  No 

Number  in  original  ease 

Each  . 


4 

3 
432 

.94 
9.00 


6 
4 

360 

1.08 

10.30 


8 

5 

288 

1.24 

11.80 


Per  dozen  in  original  case . 


10 
48 
.30 

2.80 


12' 
5 

216 

1.60 

15.20 

1 

12 

24 

.48 

4.40 


1578.   BOTTLES,  wide  mouth,  round,  flint  glass. 

Capacity,  ounces %         1          2         4 

To  take"  cork  stopper,  No.  7          8        12        14 

To  take  rubber  stopper,  No..       3456 

Number  in  original  case 864      864     720     432 

Per  dozen  .  .60       .65      .70     1.00 


6 
14 

7 

360 
1.15 


8 
18 

8 

288 
1.30 


12 
18 
8 

216 
1.68 


16 
6 

144 

1.78 

17.00 


32 
7 

72 

2.70 

25.80 


2 
15 
12 
1.60 

18.00 


16 
20 
9 

144 
1.84 


32 
26 
11 
72 
2.80 


Per  gross  in  original  case..     5.70    6.10    6.70    9.50     10.70     12.20     16.00     17.80    26.70 


1580. 


1582. 


BOTTLES,  wide  mouth,  round,  green  glass. 

Capacity,  gallons 

Number  in  original  case 

Each 

Per  dozen  in  original  case 


36 
.32 

2.90 


1 

24 

.50 

4.50 


2 
12 
1.75 

16.70 


1584. 


BOTTLES,  extra  wide  mouth,  round,  flinl 

glass. 

Capacity,  ounces  

2 

3              4 

6 

Diameter  of  bodv,  inches  

•  -  •     I'M* 

1% 

2%6           2% 

2% 

Diameter  of  neck,  inside,  inches  

1%8 

1%6             1% 

1% 

To  take  rubber  stopper,  No  

5 

6 

6               9 

9 

Height  over  all,  inches  

2 

2% 

2%6           2% 

3^6 

Number  in  original  case  

864 

720 

576           432 

360 

Per  dozen  

.94 

1.08 

1.23          1.45 

1.67 

Per  gross  in  original  case  

9.00 

10.30 

12.20        14.00 

1600 

BOTTLES,  tincture,  flint  glass,  mushroom 

stepper. 

Capacity,  ounces   

1 

2 

4               8 

16 

Number  in  original  case  

864 

720 

432            288 

144 

Per  dozen  

1.75 

1.94 

2.30           2.80 

3.86 

Per  gross  in  original  case  

.  .      16.80 

18.70 

22.20         26.90 

37.00 

Capacity,  gallons  

% 

1 

Number  in  original  case  

48 

36 

Each  

1.05 

1.56 

Per  dozen  in  original  case  

10.00 

15.00 

1586. 


BOTTLES,  tincture,  flint  glass,  low  form,  with  flat  topped  glass  stopper. 

Capacity,   ounces 1              2              4              8  16 

Number  in  original  case 864          720          432          288  144 

Per    dozen 2.00         2.20         2.60         3.20  4.35 

Per  gross  in  original  case 18.90      21.00      24.90      30.50  42.00 

Capacity,  gallons %  1 

Number  in  original  case 48  36 

Each   1.10  2.65 

Per  dozen  in  original  case 10.50  25.40 


64 
9 
48 
5.00 
48.40 

5  . 
19 
6 

3.00 
31.20 

64 

is 

48 
5.15 
49.40 

5 
6 

3.10 
30.00 

8 

2% 
1% 

9 

3% 
288 

1.90 
18.30 

32 

72 

5.40 

51.70 

2 

12 

3.40 

32.50 

32 

72 

6.35 

61.00 

2 

12 

4.75 

46.20 


98 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


No.  1588.        No.  1594.  No.  1596.  No.  1598.  No.  1612.  No.  1614. 

No.  1592. 

1588.     BOTTLES,  tincture,  flint  glass,  with  reagent  stopper. 

Capacity,   ounces 1  2  4  8  16 

Number  in  original  case 864          720          432          288          144 

Per   dozen 1.75        1.94        2.30        2.80        3.86 

Per  gross  in  original  case $16.80       18.70       22.20       26.90       37.00 

Capacity,  gallons % 

Number  in  original  case 48 

Each   '. . . 85 

Per  dozen  in  original  case 9.15 

1590.     BOTTLES,  tincture,  of  amber  glass,  with  glass  stopper. 

Capacity,   ounces 1  2  4  8  16 

Number  in  original  case 864          720          432          288          144 

Per    dozen 2.00         2.20         2.75         3.30         4.60 

Per  gross  in  original  case 20.00      22.40      26.60      32.25      44.40 

1592.    BOTTLES,  narrow  mouth,  green  glass,  with  vertical  stopper,  for  acids. 

pints  gallons 


32 
72 
5.40 
51.70 
1 

36 
2.15 
20.80 

32 
72 
6.45 
62.00 


8 

288 

2.85 

27.70 


Capacity 1 

Number  in  original  case 72  72 

Each 35  .45 

Per  dozen  in  original  case 3.60  4.90 

1594.    BOTTLES,  salt  mouth,  flint  glass,  mushroom  stopper. 

Capacity,  ounces 1  2  4 

Number  in  original  case 864  720  432 

Per  dozen 1.80          1.98          2.40 

Per  gross  in 'original  case 17.20        18.90        22.70 

Capacity,  gallons 

Number  in  original  case 

Each 

Per  dozen  in  original  case 

1596.     BOTTLES,  salt  mouth,  flint  glass,  with  flat  glass  stopper. 

Capacity,   ounces 1  2  4  8 

Number  in  original  case 864  720  432  288 

Per    dozen 2.00  2.20  2.65  3.25 

Per  gross  in  original  case 19.40         21.10         25.50         31.20 


l/2 

1 

2 

36 

24 

12 

.75 

1.15 

2.50 

5.40 

11.40 

23.80 

48 
.95 
10.20 


16 

144 

3.90 

37.80 

1 

48 

2.10 

20.00 

16 

144 

4.40 

42.50 


32 
72 
5.65 

54.60 
2 

24 
4.25 

40.80 

32 

72 

6.90 

61.50 


1598.     BOTTLES,  wide  mouth,  hollow  ground  glass  stopper,  enabling  spoon  or  spatula  to  be  kept  in 
bottle.     Complete  with  horn  spoon. 

Capacity,   ounces  ..........................................................       2  4 

Each   ................................  .....................................  50          .90 

Per   dozen  ............................  ....................................    5.00        9.00 

1610.    BOTTLES,  Aspirator,  of  heavy  glass,  with  tubulature  at  bottom. 

No  .....................................  A  B  C  D  E 

Capacity,  gallons  .............  ...........  i/i  1  2  3  5 

Each  ...................................         2.o"o  3.25  5.00  8.00  12.00 

1612.    BOTTLES,  Aspirator,  of  heavy  glass,  with  glass  stopper  and  glass  stopcock  ground  in  tubulature. 


Capacity,  ounces 

Each 

Capacity,  gallons 

Each 


y2 
8.00 


I 
12.00 


8 
3.00 
2 
14.00 


16 
3.50 
3 
16.00 


1614.    BOTTLES,  Aspirator,  of  heavy  glass,  with  narrow  outlet  for  connecting  rubber  tubing. 
Capacity,  ounces  .....................................  4  8  16 

Each  .................................................  60  .70  .90 

Capacity,  gallons  ............................................  %  1 

Each  .......................  1.65  1.75 


32 

4.00 

5 

19.00 

32 
1.10 

2 
3.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


99 


No.  1618. 


No.  1620. 


No.  1622. 


No.  1624. 


No.  1628. 


No.  1630. 


No.  1634 


No.  1638. 


No.  1640. 


No.  1644.  No.  1645. 


BOTTLES  FOR  SPECIAL  USES 

1616.    BOTTLES,  Aspirator,  graduated,  of  heavy  glass,  with  outlet  for  rubber  tubing. 

Capacity,    liters 1  2  4 

Each   $2.50       3.30        4.50 

1618.     BOTTLE,  Balsam,  with  glass  cap,  and  loosely  fitting  glass  dropper.     Capacity,  30  cc 32 

3620.     BOTTLE,  Balsam,  wide  mouth,  with  glass  rod  and  glass  cap  ground  to  fit  against  shoulder  of 
bottle.     Capacity,  30  cc 40 

1622.     BOTTLE,  Dropping,  with  Barnes'  pipette  stopper,  square  shape.     Capacity,  30  cc 10 

1624.     BOTTLES,  Dropping,  with  ground  in  pipette,  with  rubber  bulb. 

Capacity,    ec 30  60 

Each    . " 38          .40 

1628.     BOTTLES,  Dropping,  with  ground  in  thistle  top  pipette,  with  rubber  cap  to   control  delivery. 

Capacity,    cc 30  60 

Each   . ". 40          .50 

1630.     BOTTLES,  Dropping,  Rauvier's,  with  ball  top  pipette  ground  in. 

Capacity,    cc 30  60 

Each ' 50          .55 

1634.     BOTTLES,  Dropping,  "TK",  with  grooved  flat  glass  stopper. 

Capacity,   ec 15  30  50          100          200 

Each    20          .25          .30          .35          .45 

1638.     BOTTLES,  Dropping,   "TK",  with  grooved  vertical  stopper. 

Capacity,    cc 30  50          100 

Each    25          .30          .35 

1640.  BOTTLE,  Dropping,  Schuster's,  with  ground-in  glass  stopper.     Capacity,  30  cc $0.60 

1641.  BOTTLE,  Dropping,  Schuster's,  without  stopper.     Capacity,  30  cc 40 

BOTTLES,  Gas  Generating,  see  Gas  Generators. 
BOTTLES,  Gas  Washing,  see  Gas  Washing  Bottles. 

1644.  BOTTLES,  Homeopathic  Vials,  long  form. 

Capacity,  drams 1  2  3  4  6  8 

Dimensions,   mm 63x11  75x12  90x14  90x17  105x19120x20 

Per  gross 1.75  2.10  2.80  4.20  5.60        7.00 

1645.  BOTTLES,  Homeopathic  Vials,  short  form. 

Capacity,  drams 1  2  3  4  6  8 

Dimensions,  mm 42x14          58x16  64x19  68x20  80x22  83x24 

Per  gross 1.75  2.10  2.80  4.20  5.60  7.00 


100 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  II.  8.  A. 


No.  1648. 


No.  1650. 


No.  1654. 


No.  1658. 


No.  1662. 


No.  1666. 


1648.    BOTTLE,  Immersion  Oil,  unspillable,  with  -wooden  stopper  and  wire  dropper $0.60 

1650.    BOTTLE,  Immersion  Oil,  with  nickel-plated  cap,  which  cannot  gum,  and  device  for  regulating 
amount  of  oil  on  plunger 75 

1654.    BOTTLES,  Insect,  bent  neck. 

Capacity,   ounces %  " 

Per   dozen. 90        1.60 

1656.    BOTTLE,  Insect,  cyanide,  for  collecting  and  killing,  4  ounce,  ready  for  use 25 

1658.  BOTTLE,  Measuring,  designed  by  C.  V.  Bockius,  of  the  Underwriters'  Laboratories,  for  rapidly 
measuring  and  delivering  a  certain  quantity  of  reagent  where  an  approximate  measure- 
ment is  sufficient.  An  air  opening  is  provided  at  the  top  for  controlling  the  flow.  Gradu- 
ated to  25  cc  in  5  cc  divisions.  Capacity  of  bottle,  about  250  ce 6.00 

1662.  BOTTLES,  Oil  Sample,  clear  flint  glass,  with  rounded  shoulder  and  concave  bottom.  The  4  ounce 
size  is  cleaned  and  fitted  with  corks. 

Capacity,  ounces 1  2  4  8 

Each   07          .08          .12          .15 

Per   dozen 60          .80        1.15        1.50 

1664.     BOTTLES,  Oil  Sample,  4  ounce  size,  clear  flint   glass,   with   square   shoulder    and    flat   polished 

bottom.     Cleaned  and  fitted  with  corks Each  .20 

Per  dozen    2.00 

1666.  BOTTLES,  Pressure,  Lintner'S,  for  digestion  under  pressure,  with  glass  cap  and  rubber  gasket, 
mounted  in  brass  frame. 

Capacity,    cc 125          250 

Each 3.00        4.00 


CEXTBAL  SCIENTIFIC  CO.,  CU1CAGO,  U.  S.  A. 


101 


No.  1674. 


No.  1690. 


BOTTLES  FOR  REAGENTS 

BOTTLES,   Reagent,   with   raised  letters  with  surfaces  ground, 
listed  below  are  manufactured. 


Only  those  bottles  with  labels 


PLEASE  ORDER  BY  BOTTLE  NUMBER. 

1672.    BOTTLES,  Reagent,  narrow  mouth,  1  oz.,  height  3%  inches  ....................  Per  dozen    $1.60 

No.  No. 

Cohaltous    Nitrate  ..........  Co(NO,),  (^325.     Silver   Nitrate   (Amber)  .....  AgNO, 

And,  341.     Blank. 


33fi.     Gold  Chloride 

327.     Platlnic  Chloride  .  ..........  PtCl 


1674.    BOTTLES,  Reagent,  narrow  mouth,  4  oz.,  height,  o~4  inches  ....................  Per  dozen      2.40 


No. 


82. 

IB. 

16. 
31. 
97 
- 


32. 


426. 
406. 


H 

407. 
408. 
409. 

S6. 
421. 

r..%. 
29. 

28. 

•—a. 

410. 
429. 


1. 

87. 
414. 

27. 
410. 

90. 


. 

Acetic  Acid   ...............  HC,H,O.  100. 

Alcohol     ..................  CjH.OH"  --86. 

Ammonium  Carbonate  ......  (  NH4),CO,  '—¥15. 

Ammonium   Chloride    .......  XH,Cl"  411. 

Ammonium  Hydroxide  ......  NH,OH  88. 

Ammonium  Molybdate  ......  (  NH,),Mo,OM 

Ammonium  Oxalate   ........  <  NH4t.C,O4 

Ammonium  Sulphide  iAmberi.INH.KS~ 
Ammonium   Sulpnocyanide.  .  .  NH4CNS 
Ammonium  Sulphydrate  .....  NII,HS 

Barium  Carbonate  .....  •  .....  BaCO, 

Barium  Chloride  ...........  BaCL, 

Barium  Hydroxide   .........  Ba(OH), 

Barium  Nitrate  ............  Ba(NO,), 

Bromine  for  Hypobromite. 

Bromine  Water. 

Calcium  Chloride   ..........  CaCl, 

Calcium  Hydroxide  .........  CalOH), 

Calcium  Sulphate  ..........  CaSO4 

Carbon  Disulphide  ..........  CS. 

Chloroform  ................  CHC1,  • 

Cochineal. 
Coralline. 
Cupric  Sulphate  ............  CuSO, 

Dimethyl  Glyoiime  .........  iCH,t,C.(NOU). 

Ether  ....................  (C.H5),6  "  60. 

Fehling's  Solution.  59. 

Ferric  Chloride  ............  Fe,Cl,  416. 

Ferrous  Sulphate  ...........  FeSo4  61. 

Hydrochloric  Acid    .........  HC1  427. 

Hydrochloric   Acid.   Con  .....  HC1 

Hydrochloric   Acid,   Dll  ......  HCI  14. 

Hydrogen  Peroxide  .........  H,O.  417. 

Hydrogen  Sulphide  (  Amber).  HlS~  81. 

Indigo  Solution.  4. 

Iodine   Solution  .............  I+KI  420. 

Lead  Acetate  ..............  Pb(CjH,O,),  431. 

Litmus.  424. 

Magnesia    Mixture  413. 

Magnesium   S.rp'iate    .......  MgSO,  38. 

Mercuric  Chloride  ..........  HgCl, 


422. 
430. 
425. 

"•" 

~-423. 
412. 

94. 

37. 
""8. 


11. 

6. 
12. 
1". 

9. 

7. 
-"2"6. 


Mercuric  Potassium   Iodide. 

Mercurous  Nitrate HgNo, 

Methyl  Alcohol CH,OH 

Methyl   Orange. 
Xessler's  Solution. 

Nitric  Acid    HNO. 

Nitric  Acid,  Con. HNO, 

Nitric  Acid,  Dil HNO, 

Obermayer's  Reagent. 

Oxalic  Acid   H.C,O. 

Phenol    C.HJOH 

Phenolpbtbaleln. 

Picric  Acid    HC.H,(NO.),O 

Platlnic  Chloride   PtCl4 

Potassium   Carbonate K.CO, 

Potassium  Chromate    KlCrO4 

Potassium  Dichromate K"Cr.OT 

Potassium  Ferricyanide K^Fe"(CN), 

Potassium   Ferrocyanide   . . .  .K,Fe(CN)4) 

Potassium  Hydroxide KOH 

Potassium  Iodide    KI 

Potassium  Sulphate KJ5O, 

Potassium  Sulphocyanlde   .  ..KCNS 

Silver  Nitrate    (Amber) AgNo, --" 

Silver   Sulphate    Ag.SO4 

Sodium  Acetate NaC.HjO, 

Sodium  Carbonate Na,CO, 

Sodium  Cobaltic  Nitrite. 

Sodium  Hydroxide NaOH 

Sodium  Hydroxide  for  Hypo- 
bromite    NaOH 

Sodium  Phosphate NauHPO4 

Sodium  Thiosulphate NaIS,O, 

Stannous  Chloride SnClI 

Sulphuric   Acid   H.SO", 

Sulphuric  Acid,  Con H;SO4 

Sulphuric  Acid,   DU. H,SO4 

Tinct.  Guaiac. 

Turmeric. 

Blank. 


-***3 


102 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


1676.  BOTTLES,  Reagent,  4  oz.,  set  of  40  Reagent  Bottles  No.  1674,  including  the  most  common  names 
used  in  the  chemical  laboratory:  Nos.  1,  2,  3,  4,  5,  6,  7,  8,  9,  10,  11,  12,  13,  14,  15,  16,  17,  18,  19, 
20,  21,  22,  23,  24,  25,  26,  27,  28,  29,  30,  31,  32,  33,  35,  36,  59,  61,  and  3  blanks Per  set  $8.00 

1678.    BOTTLES,  Reagent,  4  oz.,  set  of  24  according  to  Fresenius,  including  Nos.  2,  3,  4,  5,  6,  7,  13,  14, 
'  "15).  16,  17,  18,  19,  20,  22,  23,  25,  26,  27,  29,  32,  36,  59  and  61 Per  set      4.80 

1680. '  BOTTLES,  Eeagent,  4  oz.,  set  of  12,  consisting  of  Nos.  1,  2,  3,  4,  5,  15,  16,  20,  23,  26,  27  and  61. 

Tor    oo*          <J  if\ 


1682.   BOTTLES,  Reagent,  narrow  mouth,  8  oz., 

No. 

131.  Acetic  Acid   ITC,H,O2 

126.  Alcohol   C,H5OH 

110.  Ammonium  Carbonate (NH4)2CO, 

109.  Ammonium  Chloride    NH4C1 

108.  Ammonium   Hydroxide NH4OH 

155.  Ammonium  Molybdate (NH 

130.  Ammonium  Oxalate (NH4),C»O, 

158.  Ammonium  Phosphate (NH4),"HPO4 

122.  Ammonium  Sulphide  (Amberi.(NH4)2S 

114.  Barium  Chloride BaCl2 

151.  Calcium  Hydroxide Ca(OH), 

159.  Ether (C,H5)26 

154.  Ferrous  'Sulphate FeSO4 

105.  Hydrochloric   Acid,   Con IIC1 

106.  Hydrochloric   Acid,   Oil HC1 

107.  Hydrogen  Sulphide  (Amber)  .ll,S 

152.  Lead  Acetate Pb(C2H,O2), 

1684.   BOTTLES,  Eeagent,  narrow  mouth,  16  oz. 

No. 

237.  Acetic  Acid   HCJTjO., 

235.  Ammonium  Carbonate (NH4)2CO, 

234.  Ammonium  Chloride NH4C1 

204  Ammonium  Hydroxide NH4OH 

227.  Ammonium  Hydroxide,  Dil..  .NH4OH  +  Aq 

229.  Ammonium  Sulphide,  Dil (NH4),S 

236.  Ammonium  Sulphide  ( Amber) .  ( NH4)~S 
218.  Barium  Chloride BaCl2 

223.  Calcium  Hydroxide Ca(OH)2 

225.  Calcium  Sulphate CaSo, 

230.  Ether    (C.HB),O 

224.  Ferrous  Sulphate FeSo4 

217.  Hydrochloric  Acid    HC1 


Per  set      2.40 

height,  6%  inches Per  dozen      3.00 

No. 

153. .  Mercuric  Chloride IlgCl. 

103.  Nitric   Acid,   Con UNO, 

104.  Nitric  Acid,  Dil IINO3 

171.  Potassium   Carbonate K,CO3 

160.  Potassium  Chromate   ICCrO4 

172.  Potassium  Ferricyanide K~Fe(CN), 

173.  Potassium    Ferrocyanide K4Fe(CN), 

150.  Potassium  Hydroxide KOH 

145.  Silver  Nitrate    (Amber) AgNO, 

112.  Sodium  Carbonate   Xa,CO5 

111.  Sodium  Hydroxide NaOH 

129.  Sodium  Phosphate N"a,HPO4 

156.  Stannous  Chloride SnCl2 

101.  Sulphuric   Acid,   Con II,SO4 

102.  Sulphuric  Acid,  Dil H2SO4 

116.  Blank. 


(pint),  height,  7%  inches Per  dozen 

No. 

222.  Hydrochloric  Acid,  Con HC1 

231.  Hydrochloric  Acid,  Dil HC1 

226.  Hydrodisodlc  Phosphate Na,HPO. 

216.  Nitric  Acid HNO, 

219.  Nitric   Acid,   Con UNO, 

232.  Nitric  Acid,  Dil UNO, 

238.  Potassium   Chromate   K,Cr64 

221.  Potassium  Hydroxide KOH 

240.  Sliver  Nitrate   (Amber) AgNO, 

233.  Sodium  Hydroxide NaOH 

215.  Sulphuric  Acid    H..SO, 

220.  Sulphuric  Acid,  Con H2SO4 

211.  Blank. 


4.30 


1686.   BOTTLES,  Reagent,  narrow  mouth,  32  oz.  (quart),  height,  9%  inches Per  dozen      6.00 


No. 
505. 
506. 
503. 
504 


Hydrochloric  Acid,  Con HC1 

Hydrochloric  Acid,  Dil HC1 

Nitric  Acid,  Con HNO, 

Nitric  Acid,  Dil HNO, 


No. 
501. 
502. 
511. 


Sulphuric   Acid,  Con H,SO4 

Sulphuric  Acid,  Dil IlZSO, 

Blank. 


1688.   BOTTLES,  Eeagent,  wide  mouth,  1  oz.,  height,  3%  inches Per  dozen      1.70 


No.  No. 

374.  Ammonium  Phosphate (NH4),HPO4  354. 

361.  Ammonium  Sodium  Phosphate.NaNH~HPO4  372. 

351.  Borax   Na2B4O7  35». 

364.  Copper    Cu  360. 

305.  Ferrous  Sulphate FeSO4  350. 

366.  Ferrous  Sulphide   FeS  .   370. 

377.  Phenyl   Hydrazine .C6II5NH,NHa  376. 

367.  Potassium  Chlorate KCl'O3  371. 

358.  Potassium  Cyanide KCN  373. 

368.  Potassium  Ferricyanide K3Fe(CN)6  375. 


Potassium   Nitrate KNO3 

Test  Paper. 

Sodium  Acetate NaC.H,O2 

Sodium   Bitartrate   NaHC4H4"O, 

Sodium  Carbonate Na,CO3 

Sodium  Nitrate KaNO, 

Sod.  Pot.  Carbonate Na2Cb3,K2CO, 

Starch. 

Zinc. 

Blank. 


1690.    BOTTLES,  Eeagent,  wide  mouth,  4  oz.,  height,  4%  inches Per  dozen      2.75 


No. 
314. 
304. 
305. 
303. 
302. 


Ammonium  Sulphate (NH4),SO4 

Borax    Na,B4OT 

Ferrous  Sulphate FeSO, 

Potassium  Cyanide KCN 

Potassium  Nitrate KNO, 


No. 

313.  Sod.  Am.  Hyd.  Phos.  .Na(NH4)HFO4+4H2O 

301.  Sodium  Carbonate    Na2CO3 

312.  Test  Paper. 

307.  Blank. 


1694.    CAPS  for  reagent  bottles. 

No A  B  C  D 

For  bottles  of  capacity,  ounces 1  to  4  8  16  32 

Height  inside,  inches 2%  2V2  2%  2% 

Diameter  inside,  inches l%fi  1%  2  2% 

Per  dozen 1.50  1.65  1.80  2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


103 


Nos.  1696-8. 


No.  1710. 


No.  1712. 


Nos.  1714-5. 


No.  1718. 


1696. 
No. 

30. 

300. 

180. 

170. 

150. 

190. 

160. 

310. 

330. 

200. 

320. 

210. 

230. 

220. 

360. 

350. 

290. 

280. 
20. 
1698. 
No. 
1310. 
1260. 
1100. 
1090. 
1080. 
1300. 
1220. 
1140. 
1510. 
1050. 
1070. 
1710. 


1712. 


BOTTLES,  Reagent,  Jewett's,  similar  to  No.  1674,  but  with  specially  made  stopper,  with  flange 
extending  downward  over  lip  of  bottle  to  furnish  protection  from  dust.  Flange  does  not  touch 
lip  of  bottle,  and  cannot  become  gummed  to  it.  Knob  of  stopper  is  made  extremely  heavy,  so 
that  when  stopper  is  laid  on  table  the  tip  is  raised  preventing  contamination.  Each  stopper 
has  raised  symbol  of  reagent  blown  in  it,  so  that  stoppers  and  bottles  cannot  be  mixed.  Bot- 
tles for  Sodium  and  Potassium  Hydroxides  have  loosely  fitting  stoppers  preventing  stick- 
ing. Please  order  by  bottle  number. 

BOTTLES,  Eeagent,  Jewett's,  narrow  mouth,  4  oz.,  height  5%  inches per  dozen   $5.25 

No. 

10. 


Acetic  Acid      HC2H3O2 

Alcohol     C2H5OH 

Ammonium  Carbonate 

Ammonium  Chloride     NHiCl 

Ammonium  Hydroxide     NHiOH 

Ammonium  Oxalate    (NH4)2CsO4 

Ammonium   Sulphide    (Amber)    ...(NH()jS 

Ammonium   Sulphocyanide     NH4CNS 

Barium  Carbonate    BaCO3 

Barium  Chloride     BaCl2 

Barium  Hydroxide      Ba(OH)3 

Calcium  Chloride    CaCl2 

Calcium  Hydroxide     Ca(OH), 

Calcium   Sulphate     CaSO, 

Cupric  Sulphate   CuSO4 

Ether   (C2H6)2O 

Ferric    Chloride    Fe2CU 

Ferrous   Sulphate    FeSO4 

Hydrochloric  Acid    HC1 


Lead    Acetate    Pb(C2H,O2)« 

MgSp, 


Hydrogen  Sul.   (Amber) 
270. 

240.  Magnesium    Sulphate 

250.  Mercuric    Chloride    HgClj 

50.  Nitric  Acid    HNOs 

80.  Potassium  Carbonate KzCO, 

130.  Potassium   Dichroii  ate      K2CriO7 

110.  Potassium   Ferrii  yanide     KjFe(CN), 

60.  Potassium  Ferroeyanide     K4Fe(CN)« 

120.  Potassium   Hydroxide     KOH 

100.  Potassium   Iodide    KI 

90.  Potassium   Sulphate      K2SO4 

70.  Potassium   Sulphocyanide     KCNS 

260.  Silver   Nitrate    (Amber)    AgNOj 

590.  Sodium  Carbonate NazCO3 

610.  Sodium   Hydroxide      NaOH 

140.  Sodium  Phosphate    NajHPO, 

40.  Sulphuric  Acid    H»SO4 

380.  Blank. 

6.25 


BOTTLES,   Eeagent,   Jewett's,   narrow  mouth,  8  oz.,  height,  7%  inches per  dozen 

No. 

1520. 

1030. 


Acetic  Acid HC2H3O2 

Alcohol     C2H5OH 

Ammonium   Carbonate    (NH,)2COS  1040. 

Ammonium  Chloride     NHiCl  1500. 

Ammonium  Hydroxide      NH4OH  1450. 

Ammonium   Oxalate    (XH,)2C2O4  .         1120. 

Ammonium   Sulphide   (Amber)    .  .  .  (NH4)2S  1110. 

Barium  Chloride     BaClz  1290. 

Calcium    Hydroxide    Ca(OH)a  1010. 

Hydrochloric  Acid,  Con HCI  1020. 

Hydrogen  Snl.    (Amber) H»S  1160. 


Lead   Acetate    Pb(C2HjO2)2 

Nitric    Acid,    Con v.HNOj 

Nitric  Acid,   Dil HNO, 

Potassium  Hydroxide     KOH 

Silver  Nitrate    (Amber)     AgNO, 

Sodium  Carbonate    Na^Os 

Sodium  Hydroxide    NaOH 

Sodium  Phosphate    Na2HPO4 

Sulphuric    Acid,    Con H,SO4 

Sulphuric  Acid,  Dil H2SO4 

Blank. 


32 

4.00 

12 


BOTTLES.  Hard  Rubber,  square,  with  tight  screw  cap,  for  hydrofluoric  acid. 

Capacity,   ounces 1  2  4  6  16 

Each   50          .60          .80        1.20        1.60 

BOTTLES,  Screw-Cap  Vials,  with  cork-lined  aluminum  screw  cap. 

Capacitv,  drams 1  2  4  8 

Dimensions,  inches  l%x%         2%x%         2%x%         3V>x% 

Per  dozen $0.35  .40  .60  .90  1.25 

1714.  BOTTLES,  Serum,  or  Vaccine,  of  amber  glass.     All  capacities  have  same  size  neck,  taking  the 

same  stopper. 

Capacity,   cc 1  to  2      3  to  4         5  8  10  15  20  25  30 

Per    gross 2.25         2.80        3.50        4.25         5.60         7.00         8.40         9.80       11.20 

1715.  RUBBER  STOPPERS,  special  form  for  Serum  Bottles  No.  1714 per  gross     2.80 

1718.    BOTTLES,  Shell  Vials,  round,  straight  wall. 

No.    . 


50 

12 

4 

25 

Per  gross 2.00 


Height,  mm 
Diameter,  mm 
Capacity,  cc 
Per  dozen 


2 
60 
13 
7 

.27 
2.50 


3 
70 
15 

11 

.28 

2.75 


80 
16 
14 
.33 
3.00 


75 
25 
34 
.50 
4.50 


104 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  S.  A. 


Nos.  1722-4.      No.  1728. 


No.  1732. 


No.  1734. 


1720. 

1722. 
1724. 
1725. 
1728. 

1730. 

1732. 
1734. 
1736. 

1737. 

1740. 
1742. 

1744. 


No.  1740.  No.  1736.  No.  1742.  No.  1744, 

BOTTLES,  Show,  Inverted,  for  storing  and  exhibiting  sample  grains,  chemicals,  etc. 


1 

7% 
2% 

.45 


2 
9 

3% 
.60 


4 

11 

4% 

1.10 


Capacity,  pints % 

Height,  inches  3%         4%  6 

Diameter,  inches 1 V-:  2  2% 

Each $0.25       .30         .35 

BOTTLES,  Specific  Gravity,  unadjusted,  with  perforated  stopper. 

Capacity,  approx.,  cc , 10  25  50 

Each •     .55  .65  .90 

BOTTLES,  Specific  Gravity,  accurately  adjusted  at  20°  C.,  with  perforated  stopper. 

Capacity,  ce 10  25  50 

Each 1.25  1.45  1.80 

BOTTLES,  Specific  Gravity,  same  as  No.  1724,  in  tin  case  with  counterpoise. 

Capacity,   cc 10  25  50 

Each    2.50         2.75         3.25 

BOTTLES,  Specific  Gravity,  Boot's,  double  walled,    with    vacuum,    maintaining    constant 
perature  inside.     With  perforated  stopper  and  ground  cap. 

Capacity,   cc 25 

Each    : 4.00 

BOTTLES,  Specific  Gravity.  Geissler's,  with    thermometer    reading    from    8°    to    40°C.    ii 
ground  in  central  neck,  and  cap  ground  on  side  neck. 

Capacity,   cc 25  50 

Each   4.00        4.50 


8 
14 

5% 
2.00 

100 
1.60 

100 
2.25 

100 
4.00 

tem- 

50 
5.00 


100 
5.50 

BOTTLE,   Specific  Gravity,  Hogarth's,   specially  recommended  by  the  United  States  Bureau  of 
Mines  for  coal  and  coke.     Widely  used  for  specific   gravity  of  iron   ores.     Capacity,   about 
100    cc    ..........................................................................       2.00 

BOTTLE,  Specific  Gravity,  Hubhard's,  for  asphalts,  bitumens,  and  dense  oils.     With  glass  stop- 
per concave  on  under  side,  with  opening  1.6   mm  to  permit  escape  of  air.     Height,   70  mm; 
diameter,  22  mm;  capacity,  about  24  cc  ..............................................      2.00 

BOTTLE,  Specific  Gravity,  Le  Chatelier's,  for  cement,  special  form  reco'mmended  by  the  United 
States  Bureau  of  Standards  for  use  in  Government  Specifications.     (See  Circular  33   of  the 
United  States  Bureau  of  Standards.)     Without   certificate  ...........................      6.00 

BOTTLE,  Specific  Gravity,  same  as  No.  1736,  but  standardized  by  the  United  States  Bureau  of 
Standards,   with   certificate  ........................................................      8.00 

BOTTLE,  Specific  Gravity,  Nicol's  Tube,  for  liquids   ..................................  70 

BOTTLES,  Specific  Gravity,  Regnault's,  for  liquids,  with  ground-in  stopper. 

Capacity,   cc  .............................................................       25  50 

Each    ...................................................................     1.50        1.70 

BOTTLES,  Specific  Gravity,  Regnault's,  for  solids,  with  ground-in  neck  and  stopper. 

Capacity,   cc  ..............................................................       25  50 

Each   ....................................................................   2.00        2.50 


CEXTHAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


105 


No.  1748. 


No.  1750.  No.  1752. 


No.  1754. 


No.  1756'. 


No.  1758. 


No.  1764. 


No.  1766. 


1746.    BOTTLE,  Specific  Gravity.  Schumann's,  for  cement,  with  tube  graduated  to  50  ce  in  i/J0  cc 

divisions     $2.75 

1748.    BOTTLE,  Specific  Gravity,  Sprengel's,  with  ground  on  suction  tube,  and  ground  caps.    Height 

over  all,  about  100  mm;  diameter  of  tubes,    14  mm 1.50 

1750.    BOTTLE,  Specific  Gravity,  Walker's,  for  very  fluid  liquids,  as  described  in  Bulletin  109  of  the 

Bureau  of  Chemistry,  United  States  Department  of  Agriculture,    Capacity,  about  20  cc.    2.00 

1752.    BOTTLE,   Specific  Gravity,  Walker's,  same  as  Xo.  1750,  for  very  viscous  liquids.     Capacity, 

about    30    cc 2.50 

1754.  SPECIFIC  GRAVITY  BOTTLE,  Weld's  Precision.  For  the  precise  determination  of  the  density 
of  liquids  and  salt  solutions  as  designed  by  Prof.  Leroy  D.  Weld  of  Coe  College.  With 
ground-on  cap  and  pointed  stopper.  Especially  valuable  for  use  with  highly  volatile  liquids 
since  the  ground-on  cap  prevents  evaporation.  The  pointed  stopper  prevents  the  formation 
of  an  overflow  drop.  With  this  bottle  weighings  can  be  made  to  an  accuracy  of  1/1000  of  1 
per  cent.,  or  with  twice  the  accuracy  of  those  made  with  a  flat  stoppered  bottle  similarly 

capped.     Capacity,  about  25  cc 2.25 

1756.   BOTTLES,  Specimen  or  Sample,  of  glass,  round,  with  cork-lined  aluminum  screw-caps. 

Capacitv,  ounces 1  2  4  8  16 

Height.'inches  3%  3%  4%  4%  5% 

Diameter,  inches 1%  1%  1%  2V>  3% 

Per  dozen 75  .80  1.00  1.50  2.20 

1758.    BOTTLES,  Specimen  or  Sample,  of  glass,  square,  with  cork-lined  aluminum  screw-caps. 

Capacity,  ounces 1  2  4  8 

Height/inches 2%  31%,  4%  5%6 

Side,  inches 1%  1^  113^6  2% 

Per  dozen 75  .80*  1.00  1.50 

For  other  SAMPLE  BOTTLES  and  JARS,  sec  Jars,  Sample;  also  Boxes,  Sample. 
BOTTLES,  Vacuum  or  Thermos,  see  Vacuum  Bottles. 
BOTTLES,  Sterilizer,  see  Xo.  12391. 
1764.    BOTTLES,  Volatile  Liquid,  glass  stoppered  with  ground-on  glass  cap. 

Capacity,    ounces 2  4  8  16 

Each   . '. 75          .90        1.10        1.50 

1766.    BOTTLES,  Washing,  with  heavy  neck,  fitted  with  rubber  stopper  and  movable  delivery  tube. 

Capacity,  ounces 8  12  16  24  32  64 

Each..' 45  .50  .55  .60  .65  1.20 


106 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


1768. 
1770. 
1772. 
1774. 

1776. 

1778. 


No.  1776. 


No.  1782. 


No.  1784. 


No.  1786. 


No.  1788. 


No.  1778. 


1780. 
1782. 
1784. 

1786. 

1788. 


BOTTLES,  Washing,  of  Pyrex  glass,  with  neck  covered  with  wicker,  for  use  with  hot  water. 

Capacity,   ounces 16  32 

Each $1.10  1.25 

BOTTLES,  Washing,  all  of  glass,  with  ground  connections,  for  ether. 

Capacity,  ounces " 8                  16  32 

Each ' 1.35             1.65  2.20 

BOTTLES,  Washing,  with  ground  connections  and  stop-cocks,  for  use  with  volatile  liquids. 

Capacity,   ounces 8            16  32 

Each   4.80        5.00  5.50 

BOTTLES,  Washing,  with  Griffin's  tube,  for  continuous  flow. 

Capacity,   ounces 8            16  32 

Each   1.50        1.60  1.75 

GRIFFIN'S  TUBE  only  No.  1774 1.00 

BOTTLES,  Gas  Washing,  see  Gas  Washing  Bottles. 

BOTTLES,  Water  Sample,  2  ounce  capacity,  with  flat  ground  in  stopper.  Both  stopper  and 
bottle  may  be  obtained  numbered  serially.  In  ordering,  specify  plain  or  numbered  bottles, 
and  if  the  latter,  state  the  series  of  numbers  desired. 

No A  B 

Style     plain     numbered 

Each    20  .30 

Per   dozen 2.20          3.25 

BOTTLES,  Water,  of  stoneware,  see  Jars,  Stoneware. 
BOTTLES,  Wax  or  Ceresine,  for  hydrofluoric  acid. 

Capacity,    cc 30          125          250  500 

Each   25          .50          .60  .80 

BOTTLES,  Weighing,  conical  form,  very  light,  ground-in  glass  stoppers. 

Capacity,  cc 15              30  60 

Each 40             .50  .60 

BOTTLES,  Weighing,  high  form,  flat  bottom,  without  neck, "ground-in  glass  stoppers. 

No A               B        .        C               D  E 

Height,  mm 50              60              80              90  100 

Diameter,  mm 15              10              15              18  25 

Each 30             .30             .30             .40  .50 

BOTTLES,  Weighing,  low  form,  flat  bottom,  without  neck,  ground-in  glass  stoppers. 

No A             B             C             D             E             F  G 

Height,  mm 40            50            50            50            60            60  80 

Diameter,  mm 25            25            30           40            30            50  40 

Each 38           .44           .50           .55           .50           .75  .70 

BOTTLES,  Weighing,  extra  wide,  flat  bottom,  without  neck,  ground-in  glass  stoppers. 

No A             B  C 

Height,    mm 30            30  30 

Diameter,    mm 50            65  70 

Each   1.10        1.60  2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


107 


* 

- 

L 


No.  1790.  No.  1794,  No.  1796.  No.  1792. 


No.  1798.          No.  1800.  No.  1802. 


No.  1804. 


1790. 
1792. 
1794. 
1796. 
1798. 

1800. 
1802. 

1804. 
1806. 

1808. 

1814. 
1816. 

1817. 
1820. 


No.  1816.  No.  1817. 

No.  1808. 

BOTTLE,  Weighing  Tube,  set  of  two  telescoping  tubes,  each  5  cm  long  inside,  with  ring  han- 
dle  on   inside   tube  ................................................................      $0-25 

BOTTLE.  Weighing,  Parr's,  with  cover  ground   outside,   as   used   in   coal   analysis.     Diameter 
25  mm  ;   height,  20  mm  .............................................................  60 

BOTTLE.   Weighing  Pipette,   Grethen's  Form,  with  glass  stop-cock,  for  fuming  acids;  capacitv. 
2  cc   .............................................................................       2.50 

BOTTLE,  Weighing  Pipette,  Lunge's,  with  two   stop-cocks,   for   fuming   acids,   eiC.     Capacity, 
about  15  cc  .......................................................................       4.50 

BOTTLES,  Woulff's,  of  heavy  gla<s,  with  two  necks. 

Capacity,  cc  ............  "  ............          12.1  250  500  1000  2000 

Each..'  ..................................  80  1.10  1.40  1.90  3.30 

BOTTLES,  Woulff's,  of  heavy  glass,  with  three  necks. 

Each  ..................  "  ..................  90  1.30  1.60  2.20  3.50 

BOTTLES,  Woulff's,  of  heavy  glass  with  two  necks  and  tubulature  at  bottom. 

Capacity,   ce  ...........  '.  ..............................       250          500        1000        2000 

Each    .  ".  ..................................................     1.40        1.80        £50        3.80 

BOTTLES,  Woulff's,  of  heavy  glass,  with  three  necks  and  tubulature  at  bottom. 

Capacity,    cc  ............  ".  .................................       250          500        1000        2000 

Each    .".  ..................................................      1.60         2.00         2.75         4.10 

BOTTLES,  Woulff's,  of  heavy  glass,  with  three  necks,  with  stopper  and  delivery  tubes  ground  in. 
Capacity,    cc  .....................................................        250          500        1000 

Each    .'.  .........................................................      3.30        4.25        5.00 

BOTTLE  BEST,  Hard  Rubber,  for  use  under  acid  bottles,  etc.,  for  protecting  table  tops.     Dia- 
meter inside,  334   inches.     \Vill  take  bottles  up  to  32  ounce  or  1  liter  ................        .20 

BOWL,  Porcelain,  so-called  pint  size.     Used  in  washing  out  gluten  in  flour  analysis  ......  35 

BOXES,  Aluminum,  with  aluminum  screw  top,  2%  inches  in  diameter  by  2^  inches  high. 

Each    ..........  .  ................................................  ".  ...............  40 

BOXES,  Aluminum,  same  as  Xo.  1816,  but  with    box   and   cover   numbered.     In   ordering    state 
what  numbers  are  desired  ........  .  ............................................  each        .45 

BOXES,    Aluminum,    with   aluminum    top.     The  diameter  of  these  boxes  is  uniform  so  that  the 

cover  fits  the  bottom  of  the  box,  making  it  possible  to  keep  box  and  cover  together  while  the 

box  is  open. 

No 

Diameter,   inches 
Height,    inches 
Each    . 


A 

2 


B 

2% 


C 
3% 


.25 


.30 


.50 


1821. 


BOXES,  Aluminum,  same  as  Xo.  1S20,  but  with   box    and   cover   numbered.  In   ordering  state 
what  numbers  are  desired. 

No A            B  C 

Diameter,   inches 2  2%  3% 

Height,   inches %  1%  2 

Each 30  .35  .55 

BOXES,  Glass,  see  Jars,  Sample. 


108 


CENTKAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1824. 


*TO.  1826. 


No.  1828. 


No.  1830. 


1824.    BOXES,  Pasteboard,  round,  telescope  form. 

No A  B  C 

Diameter,  inches H4          1%          1% 

Depth,  inches ifo          %6          ]%„ 

Per   dozen 15          .17          .20 

Per  gross $1.50        1.70        2.00 

1826.     BOXES,  Pasteboard,  rectangular,  slide  form,  white. 

No 

Length,    inches 

Width,   inches 

Depth,  inches 

Per   dozen 

Per  gross 

BOXES,  Slide,  see  Slide  Boxes. 

BOXES,  Soil  Sample,  see  Soil  Analysis  Apparatus. 

1828.    BOXES,  Seamless  Tin,  round,  .very  convenient  for  samples.    Widely  used 

Capacity,   ounces %  1  2  4 

Per   dozen .25          .30          .50          .70 

Per    gross 2.20        2.90         4.60         7.50 

1830.    BOXES,  Turned  Wood,  plain,  for  samples. 

Capacity,   ounces % 

Per   dozen 30 

Per  gross 2.65 


D 


E 


.55 
5.50 


1% 

n/16 

.14 

1.40 


.60 
6.00 

B 

29/io 

1% 

1:Ko 

.16 

1.60 


r 

2% 

i 

.70 
7.00 

C 
2% 


.18 
1.80 


in  asphalt  laboratories. 

8  16  24 

1.00         1.60         1.80 

11.00       17.50       18.50 


1 

.40 
3.70 


2 

.55 
5.64 


4 

1.00 
10.30 


No.  1836. 


No.  1838. 


BRUSHES 


1832. 
1834. 

1836. 


BRUSH,  Assay,  of  bristle,  for  lead  buttons 60 

BRUSH,  Beaker,  with  wood  handle  and  black  bristles.  Length  of  bristle  part,  3  inches;  diameter, 

2  inches ;  total  length,  11%  inches .20 

BRUSHES,  Bottle,  bristle  end,  brass  wire,  white  bristles. 

No 

Total  length,  inches 

Length  of  brush  part,  inches 

Diameter  of  brush  part,  inches 

Each    . 


A 

12 
4 

2% 
.20 


B 

20 


.25 


No 


A 

10&25 
24 
3 


B 

50  &  100 
36 
3V* 


1838.    BRUSHES,  Burette,  tinned  wire,  white  bristles. 

For  burettes,  ce 

Total  length,  inches 

Length  of  bristle  part,  inches 

Diameter  of  bristle  part,  inches 

Each 

1840.    BRUSH,  Counter  Dusting,  wooden  handle,  five  rows  unbleached  bristles.     Length  of  bristle  part, 

8  inches;  width,  2%  inches;  total  length,  13%  inches 60 

1842.    BRUSH,  Cylinder  or  Jar,  with  wooden  handle  and  four  rows  black  bristles.      Length  of  bristle 
part,  5  inches;  diameter,  2%  inches;  total  length,  12  inches .20 


.08 


.10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


109 


No.  1P50. 
No.  1854. 
No.  1872.  No.  1852.  Nos.  1856-8.  Nos.  1860-2.  No.  1866. 


No.  1844.         No.  1846. 


No.  1870. 


No.  1878. 


1844. 
1S46. 
1S48. 

1850. 

1852. 

1854. 
1856. 

1858. 
1860. 
1862. 
1866. 
1868. 


1870. 
1872. 


1S74. 

1 570. 

1878. 


No.  1876. 
BRUSH,  Cylinder  or  Jar,  with  wooden  handle  and  black  bristles.     Length  of  bristle  part,  4% 

inches;    diameter,   2^4   inches;    total  length,  12  inches $0.25 

BRUSH,  Cylinder  or  Jar,  with  wooden  handle  and  four  rows  of  black  bristles,  with  tufted  end. 

Length  of  bristle  part,  5  inches;  diameter,  2%  inches;  total  length,  12  inches 25 

BRUSH,  Cylinder  or  Jar,  with  'wooden  handle  and  four  rows  of  black  and  white  bristles,  with 
two  tufts  set  at  angle  for  reaching  corners  of  large  bottles,  cylinders  and  jars.  Length  of 

bristle  part,  4%  inches;   diameter,  2%  inches;  length  over  all,  12  inches 35 

BRUSH,  Dusting,  flat  for  ore  plates,  etc.;  bristles,  1%  inches  in  length,  metal  bound. 

Width  of  bristle  part,  inches 1  2 

Each    12          .20 

BRUSH,  Funnel,  taper  end,  black  bristle,  wooden    handle.     Length    of    bristle    part,   3 

diameter  at  large  end,  2%  inches;  total  length,  11*4  inches 

BRUSH,  Lacquer,  of  best  camel 's  hair,  metal  bound,  %  inch  wide 

BRUSHES,  Milk  Bottle,  for  bottles  with  necks  not  less  than  %6  inch  in  diameter. Each 

Per  dozen 
BRUSHES,  Milk  Bottle,  for  bottles  with  neck  not  less  than  *4  inch  in  diameter.  .Each 

Per  dozen 
BRUSHES,  Cream  Bottle,  for  bottles  with  necks  not  less  than  %  inch  in  diameter. Each 

Per  dozen 
BRUSHES,  Cream  Bottle,  for  bottles  with  necks  not  less  than  *A  inch  in  diameter. Each 

Per  dozen 

BRUSHES,  Pencil,  of  camel 's  hair  bound  in  quill.     Size small  medium 

Per  dozen .30  .45 

BRUSHES.  Pencil,  of  camel's  hair,  quill  handles,  silk  bound. 

Length  of  hair,  mm 14 

Each   .10 

Per   dozen 1.00 

BRUSH.  Pipette,  for  use  in  cleaning  volumetric,  Mohr's  or  milk  pipettes 

BRUSHES,  Scale  Pan,  of  camel's  hair,  wooden  handle,  metal  bound.    Length  of  hair,  about  1  inch. 

Width  of  hair  part,  inches 1  1^6  2 

Each 16  .22  .30  .36 

BRUSH,  Scale  Pan,  of  camel's  hair,  round,  with    wooden    handle.      Diameter   of   hair    part    % 

inch     40 

BRUSH,  Soil  Percolation  Tube,  for  cleaning  tubes  used  in  soil  testing.  Of  unbleached  bristles, 
with  tufted  end,  and  wooden  handle.  Length  of  bristle  part,  7  inches;  diameter,  2  inches; 

l.-!!y;th  over  all.  3  feet  9  inches , 60 

BRUSH,  Soil  Sampling  Tube,  for  cleaning  tubes  used  in  sampling  soils.  Of  stiff  vegetable  fiber 
with  strong  twisted  wire  handle.  Length  of  bristle  part,  4%  inches;  diameter,  1%  inches; 
total  length,  65  inches 25 


18 

.12 

1.20 


3 

.30 

inches; 
.18 
.10 
.06 
.60 
.08 
.80 
.10 

1.00 
.10 

1.00 
large 

.50 


.13 

1.25 

.15 


110 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


0 


Nos.  1880-2.  Nos.  1884-6.      No.  1888. 


No.  1892.       No.  1894. 


No.  1896. 


No.  1902. 


No.  1890. 


1880. 

1882. 
1884. 

1886. 
1888. 


1890. 


1892. 

1894. 
1896. 

1902. 


BRUSH,  Test  Tube,  bristle  end,  brass  wire.    Length  of  bristle  part  over  all,  4%  inches;  diameter, 

1%  inches;  total  length,  10%  inches Each  $0.09 

Per  dozen        .85 

BRUSH,  Test  Tube,  same  as  No.  1880,  but  with  tinned  wire Each  .05 

Per  dozen        .45 

BRUSH,  Test  Tube,  sponge  end,  brass  wire,  for  test  tubes  %  inch  or  larger  in  diameter.  Length 
of  bristle  part  including  sponge,  3%  inches;  diameter,  1%  inches;  total  length,  11  inches. 

Each  .09 

Per  dozen        .90 

BRUSH,  Test  Tube,  same  as  No.  1884,  but  with  tinned  wire Each  .05 

Per  dozen        .60 

BRUSH,  Test  Tube,  tufted  end,  tinned  wire.  Length  of  bristle  part,  3%  inches;  diameter,  1  inch; 
total  length,  10  inches.  This  brush  is  much  superior  to  the  ordinarily  so-called  tufted  end 
brushes,  in  which  the  wire  projects  at  the  end  making  it  impossible  to  clean  the  bottom  of  the 
test  tube  without  breakage.  Length  of  bristle  part,  3%  inches;  diameter,  I1/!  inches;  total 

length,  10%  inches Each  .05 

Per  dozen        .50 

BRUSHES,  Test  Tube,  Dolbey's  (Patented),  with  tuft  of  bristles  so  constructed  as  to  reach  all 
parts  of  tube,  yet  affording  the  most  perfect  protection  to  the  tube  from  breakage  by  the  wire 
end.  This  is  the  best  test  tube  brush  made  and  we  heartily  recommend  it  to  laboratory 
workers  who  have  been  looking  for  something  better  than  the  old  style  brush  with  the  con- 
stant annoyance  from  breakage  or  imperfect  cleansing. 

No A  B  C 

Total  length,  inches 9  13%  13% 

Length  of  bristle  part,  inches 2%  4  4 

Diameter  of  bristle  part,  inches %  1  114 

For  test  tubes,  diameter,  inches %  to  %     %  to  %     1  or  larger 

Each   .09  .11  .12 

Per    dozen .90  1.15  1.20 

BRUSHES,  Test  Tube,  Probangs,  with  rattan  handle  and  sponge  end.    Length  over  all,  9  inches. 

Each  .10 

Per  dozen      1.00 
BRUSHES,  Tube,  for  small  tubes  and  funnel  stems,  of  bristle  on  tinned  wire.     Length  of  bristle 

part,  2  inches;  diameter,  %  inch;  total  length,  12%  inches Per  dozen         .20 

BRUSHES,  Volumetric  Flask,  with  flexible  steel  spring  enabling  the  brush  to  reach  every  part  of 


flask.     No . 

For  flasks,  capacity,  cc , 

Each  

BULBS,  Absorption,  see  Absorption  Bulbs;  Potash  Bulbs. 
BULBS,  Leveling,  of  glass,  for  use  in  gas  analysis. 

Capacity,   cc > 

Each   

BULBS,  Nitrogen  or  Kjeldahl,   see  Nitrogen  Apparatus. 
BULBS,  Rubber,  see  Rubber  Bulbs. 


A 
250 
.25 


B 

500 
.30 


250 
.55 


C 

1000 

.35 


500 
.75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Ill 


No.  1908.       No.  1910.      No.  1912. 


No.  1914.     No.  1916. 

BURETTES 


No.  1918. 


No.  1920.        No.  1922. 


1908.     BURETTES,  for  pinchcock,  without  fittings.     Graduated  in  fa  ec  divisions. 

Capacity,  cc 10                  25                 50  100 

Each  ..' $0.45             .60              .90  1.40 

ATTACHMENT  for  No.  1908,  see  Burette  Accessories. 

1910.     BURETTES,  for  pinchcock,  with  side  tube  for  refilling,  without  fittings.     Graduated  in  fa  cc 
divisions. 

Capacitv,   cc 10            25            50  100 

Each    .". 60          .75        1.05  1.60 

ATTACHMENT  for  No.  1910.  see  Burette  Accessories. 
1912.    BURETTES,  with  straight  glass  stopcock.     Graduated  in  fa  ce. 

Capacitv,  cc 10                 25                50  100 

Each  ..' 1.40             1.70            1.90  2.75 

1914.     BURETTES,  with  straight  glass  stop-cock  and   side    tube   for   refilling.      Graduated   in  fa   cc 
divisions. 

Capacity,    cc 10            25            50  100 

Each   1.60        1.90        2.10  2.95 

1916.     BURETTES,   with  three-way  stop-cock.     Graduated  in  fa  cc  divisions.      .    ' 

Capacity,    cc 25            50  100 

Each   4.00        4.30  5.00 

1918.     BURETTES,  with  Fresenius  stop-cock.     Graduated  in  fa  cc  divisions. 

Capacitv,    cc 25            50  100 

Each   .". 2.50        2.70  3.50 

1920.     BURETTES,  with  Fresenius  stop-cock  and  side  tube  with  glass  stop-cock  in  same,  for  refilling, 
according  to  Gawalowski.     Graduated  in  ^o  cc  divisions. 

Capacity,    cc 25            50  100 

Each    4.50        4.75  5.50 

1922.     BURETTES,  with  straight  glass  stop-cock  to  operate  with  left  hand,  and  side  tube  with  glass 
stop-cock  in  same,  for  refilling,  according  to  Gawalowski.     Graduated  in  fa  cc  divisions. 

Capacity,    cc 25            50  100 

Each    4.50        4.75  5.50 

1924.     BURETTES,   Schellbach,   for  pinchcock,  with  blue  line  on  white  background  to  facilitate  read- 
ing of  meniscus;   without  fittings.     Graduated  in  ^Q  cc  divisions. 

Capacity,    cc 25            50  100 

Each   2.20        2.50  3.80 

1926.     BURETTES,   Schellbach,   for  pinchcock,  with  side  tube  for  refilling,  with  blue  line  as  in  No. 
1924,  without  fittings.     Graduated  in  fa  cc  divisions. 

Capacity,   cc 25            50  100 

Each   2.40        2.70  4.20 

1928.     BURETTES,   Schellbach,   with   straight   glass  stop-cock.     Graduated  in  fa  cc  divisions. 

Capacity,    cc 25            50  100 

Each    3.00        3.50  5.00 

1930.     BURETTES,  Schellbach,  with  three-way  stop-cock.     Graduated  in  fa  cc  divisions. 

Capacitv,    cc 25            50  100 

Each    .". 5.00        5.60  6.76 


112 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


I 


r 


No.  1932. 


No.  1934. 


A.      B. 
No.  1946. 


No.  1950.  No.  1951. 


No.  1952. 


1932.     BURETTES,  Schellbach,  Automatic,  with  zero  point  and  overflow  cup.     With  three-way  stop- 
cock, for  refilling  from  reservoir.     Graduated  in  i{0  cc  divisions. 

Capacity,   cc 25  50          100 

Each   $6.00        7.00        8.00 

1934.  BURETTES,  Automatic,   Squibb 's,   consisting  of  a  Schellbach  burette  with  Frosenius  stop-cock 

mounted   on  reservoir.     Complete  with   reservoir,  clamp  and  suction  tube,  but  without  pres- 
sure bulb.     Capacity  of  burette,  50  cc.     Graduated  in  ifo  cc  divisions 9.00 

1935.  BURETTE  only  of  No.  1934 5.40 

1936.  CLAMP  only  of  No.  1934 75 

PRESSURE"  BULB  for  No.  1934,  see  No.  11530. 

1946.  BURETTES,  Calibrating,  Morse's,  for  flasks,  burettes,  and  pipettes. 

No A  B  C 

Capacity  of  bulbs,  ce 500        200  &  50    50,  3  &  2 

Each   10.50          6.75  7.50 

1947.  STOP-COCK,  three-way,  for  No.  1946 3.50 

1948.  BURETTE,  Calibrating,  Morse's,  1  cc,  with  three-way  stop-cock,  for  small  quantities...      6.00 

1950.  BURETTES,  Dispensing,  for  pinchcock,  without  fittings. 

Capacity,   cc 250          500        1000 

Graduated  in,  cc 1  5  10 

Each    4.00         4.50         5.50 

1951.  BURETTES,  Dispensing,  with  straight  glass  stop-cock. 

Capacity,    cc 250          500        1000 

Graduated  in,  ce 1  5  10 

Each    5.40        5.60        7.00 

1952.  BURETTE,  Weighing,  Ripper's,   arranged  for  suspending  from  balance  hook  by  aluminum  wire. 

Graduated  to  60  ec  in  5  cc  divisions 3.50 

BURETTES,  PRECISION 

1958.     BURETTES,  Precision  or  Normal,  for  pinchcock,   graduated   to  meet   the   requirements   of   the 

United  States  Bureau  of  Standards.     With  unofficial  factory  certificate.     Without  fittings. 

Capacity,    cc 10  25  50          100 

Graduated  in,  cc 1£0          i^0          i/j0  }£ 

Each    2.60        3.00        3.70        4.50 

1960.     BURETTES,  Precision  or  Normal,  with  straight  glass  stop-cock  with  tip  curved.     Graduated  to 

meet  the  requirements  of  the  United  States   Bureau   of   Standards.     With   unofficial   factory 

certificate. 

Capacity,    cc 25  50         100 

Graduated  in,  cc i^0          1£0  i/- 

Each    4.10        4.80        5.20 

1962.    BURETTES,  Precision  or  Normal,  with  straight  glass  stop-cock  with  curved  tip,  tested  by  the 

United  States  Bureau  of  Standards.     With  control  stamp  and  certificate  of  corrections. 

Capacity,   cc 25  50         ]  Ot  i 

Graduated  in,  cc }<J0          1^0  u 

Each    - , 7.75        8.35        9.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


113 


No.  1990. 


No.  1992. 


No.  1996. 


No.  1998. 


No.  2000. 


1904.  BURETTES,  Precision  or  Normal,  with  Fresenius  stop-cock,  graduated  to  meet  the  requirements 
of  the  United  States  Bureau  of  Standards.  With  unofficial  factory  certificate. 

Capacity,    ce 25  50          100 

Graduated  in,  cc ^0  i{0  }& 

Each    $4.10        4.80        5.20 

1966.  BUBETTES.  Precision  or  Normal,  with  Fresenius  stop-cock,  tested  by  the  United  States  Bureau 
of  Standards.  With  control  stamp  and  certificate  of  corrections. 

Capacity,   ce 25  50          100 

Graduated  in,  ce Vio          Mo  % 

Each   7.75        8.25        9.00 

BURETTE  ACCESSORIES 

1968.     BURETTE  ATTACHMENT,  consisting  of  glass  tip  with  rubber  connection  and  pinch-cock      .25 

1970.  BURETTE  ATTACHMENT,  three-way,  for  refilling  from  reservoir.     Complete  with   glass   tip, 

T-tube,  rubber  connection,  and  two  pinch-cocks     50 

1971.  GLASS  TIPS  only  for  Nos.  1968-70 per  dozen        .30 

1976.     BUhETTE  CAl-S,  to  protect  inside  of  burettes  from  dust. 

Xo A             B  C 

For  burettes,   ce 25           50  100 

Each    : 05          .05  .05 

Per    dozen 50          .50  .50 

1982.     BURETTE  FUNNEL,   1  inch  in  diameter,  for  use  in  filling  burettes 30 

19S4.     BURETTE  MENISCUS  READER,  consisting  of  a  nickel-plated  brass  clamp  to  fasten  on  the 

burette,  with   adjustable  eyepiece 2.00 

BURNERS  FOR  GASEOUS  FUELS 

Acetylene. 

1990.  BURNER,  Bunsen,  for  acetylene  gas.  Height  of  burner,  5%  inches;  diameter  of  tube,  9fo 
inch  2.25 

Coal  Gas. 

1992.  BURNER.  Bunsen,  with  air  regulator  and  slot-shaped  nipple  which  can  easily  be  adjusted  to  suit 
the  local  conditions  of  gas  pressure.  Height,  5^  inches;  diameter  of  tube,  ^6  inch-  Finished 
in  oxidized  brass  with  japanned  base .40 

1994.  BURNER,  Bunsen.  similar  to  No.  1992  but  larger  in  size.  Height,  o%- inches;  diameter  of  tube, 
K.  inch  -50 

1996.  BURNER,  Bunsen,  similar  to  No.  1992.  bnf  provided  with  stop-cock  on  gas  inlet  tube.  Height, 
5^2  inches;  diameter  of  tube,  ~,\f,  inch 1.25 

1998.  BURNER,  Bunsen,  same  as  No.  1992,  without  base,  and  with  stop-cock,  for  screwing  into  gas 
pipe.  Convenient  for  constructing  digestion  shelves,  etc.  Total  length,  6  inches;  diameter, 
"1,;  inch : 1.00 

2000.  BURNER.  Bunsen,  with  stop-cock  and  pilot  flame.  Height,  6  inches;  diameter  of  tube,  H 
inch  2.30 


114 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2028. 


NO.  2034 


No.  2036. 


2002.    BURNERS,  Bimsen,  Central  Draft,  an  excellent  burner  for  elementary  student  use.     Substances 

accidentally  dropped  in  tube  will  fall  through  without  clogging  gas  inlet.     Height,  5%  inches; 

diameter  of  tube,  %6  inch ' Each  $0.32 

Per  dozen  3.20 
2004.  BURNER,  Bunsen,  Central  Draft,  same  as  No.  2002,  with  air  regulator.  Height,  5%  inches; 

diameter  of  tube,  ~/w  inch. .35 

2006.  BURNER,  Bunsen,  Central  Draft,  for  use  with  gasoline  gas,  fitted  with  air  regulator.  Height, 

5%  inches;  diameter  of  tube,  %6  inch -40 

2008.  BURNER,  Bunsen,  low  form,  with  air  regulator.  Length,  5%  inches;  height,  3  inches;  diameter 

of  tube,  %6  inch 60 

2010.  BURNER,  Bunsen,  micro  form,  nickel-plated,  2  inches  high,  tube  %  inch  in  diameter 60 

2012.  BURNER,  Bunsen,  micro  form,  nickel-plated  3  inches  high,  tube  %  inch  in  diameter 35 

2014.  BURNER,  Argand,  adjustable  flame,  with  copper  chimney.  Especially  desirable  where  uniform 

temperature  is  essential.  Total  height  including  chimney,  7  inches 1.85 

2016.  BURNER,  Argand,  with  glass  chimney  7  inches  high;  total  height,  10  inches 1.50 

2020.  BURNER,  Argand,  with  mica  chimney  8  inches  high;  total  height,  11  inches 1.60 

2023.  CHIMNEY  for  Argand  Burners,  of  co"pper.  Height,  4  inches;  diameter,  2  inches 20 

2820.  CHIMNEY  for  Argand  Burners,  of  glass.  Height,  7  inches;  diameter,  2  inches.  Eacb  .12 

Per  dozen  1.20 
2025.  CHIMNEY  for  Argand  Burners,  of  mica.  Height,  8  inches;  diameter,  2  inches 30 

2028.  BURNER,  Chaddock's,  made  of  porcelain  and  white  fire  clay,  incorrodible  and  extremely  dur- 

able. Intended  especially  for  use  in  hoods,  where  metal  burners  corrode.  No  support  or  wire 
gauze  necessary.  Complete  with  air  regulator,  support  for  dishes,  chimney  for  triangles, 
asbestos  disk  and  rings.  Height  including  dish  support,  9  inches;  outside  diameter  of  dish 
support  4  inches 4.50 

2029.  DISH  SUPPORT,  or  Castle  Top,  for  No.  2028 70 

2030.  CHIMNEY  for  triangles,  for  No.  2028 30 

2034.     BURNERS,  Koch  Safety,  with  automatic  valve  to  shut  off  gas  when  flame  is  extinguished.   Valve 

is  operated  by  spring  controlled  by  expansion  and  contraction  of  metallic  spirals.  Especially 
desirable  in  heating  incubators  or  other  apparatus  where  flame  must  be  kept  in  operation 
over  long  periods  of  time.  With  threaded  inlet  for  attaching  metallic  tubing. 

No A  B 

Height,   inches 5  6 

Diameter  of  tube,  inches %6  Tie 

Each    6.50         7.00 

2036.     BURNERS,  Koch  Safety,  same  as  No.  2034,  but  on  stand  adjustable  in  height. 

No A  B 

Height,    inches 9  10 

Adjustable    to,    inches 13  14 

Each   9-20      10.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


115 


2038. 
2040. 
2041. 


2044. 
2045. 


2048. 
2049. 
2052. 

2054. 
2056. 
2058. 
2062. 
2064. 


No.  2054. 


No.  2058. 


No.  2064. 


BURNER,  Koch  Safety,  large  size,  with  weight  release  instead  of  spring,  insuring  more  per- 
fect operation.  With  mica  chimney  to  protect  flame  from  draft.  On  stand  adjustable  hori- 
zontally as  well  as  vertically $15.00 

BURNER,  Koch  Safety,  same  as  No.  2038,  but  with  two  burners  mounted  on  same  stand.  Each 
burner  is  provided  with  mica  chimney,  and  can  be  adjusted  horizontally.  Vertical  adjust- 
ment common  to  both 21.00 

MICA  CHIMNEY,  with  clamp  to  attach  to  Koch  Safety  and  other  burners 1.70 

BURNERS,  Meker,  a  very  powerful  burner  designed  on  scientific  principles  which  eliminates 
entirely  the  cold  Bunsen  cone  and  gives  a  flame  that  is  practically  a  homogeneous  mass  of 
burning  gas  with  a  temperature  that  is  nearly  uniform  throughout.  No.  0  is  the  students' 
form;  Xos.  1  and  2  are  to  be  used  instead  of  the  Bunsen  Burner;  No.  3,  the  general  labora- 
tory type;  Nos.  4  and  5,  to  replace  the  blast  lamp. 

No 0  1  2  3  4  5 

Height  of  burner,  mm 115          115          130          155          190          250 

Diameter  of  flame,  mm 16  16  20  25  30  43 

For  artificial  gas 1.70        1.80        2.00        2.60        3.10        6.50 

Tor  natural  or  gasoline  gas 1.80        2.00        2.60        3.10        6.50 

BURNERS,  Meker,  Multiple  Tube,  with  four  No.  3  burners  mounted  on  a  common  tube.  Very 
useful  in  heating  combustion  or  muffle  furnaces. 

For  artificial  gas 16.00 

For  natural  or  gasoline  gas 19.25 

BURNER,  Multiple  Tube,  same  as  No.  1992,  with  two  tubes  on  same  base.     Height,  6  inches; 

diameter  of  tubes,  %6  inch 2.30 

BURNER,  Multiple  Tube,  three  tubes  iri  circle1.  Height  6  inches,  diameter  of  tubes  %6  inch  2.85 
BURNER,  Multiple  Tube,  four  tubes  in  circle.  Height  6  inches,  diameter  of  tubes  %6  inch  3.00 
BURNER,  Multiple  Tube,  six  tubes  in  circle.  Height  6  inches,  diameter  of  tubes  ^6  inch.  4.00 
BURNER,  Multiple  Tube,  four  tubes  in  row.  Height  6  inches,  diameter  of  tubes  %6  inch.  2.90 
BURNER,  Multiple  Tube,  four  tubes  in  row,  each  with  stop-cock.  Height  7%  inches,  diameter  of 
tubes  %8  inch 6.90 


116 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2068.  No.  2082. 

2066.   BURNERS,  Bunsen  (Simple  Combustion  Furnace).     Consists  of  four  adjustable  burners  having 

regulators  for  both  gas  and  air  and  burning  cither  coal,  natural  or  gasoline  gas,  mounted  on  a 

gas  supply  tube  with  forks  9}4  inches  apart,  adjustable  through  a  3-inch  range,  for  holding 

combustion  tubes $13.00 

Burners,  Fletcher's 

2068.     BURNERS,  Fletcher's  Argand.     A  simple,  indestructible  burner  'for  general  work.     The  flame 
*        is  shorter,  more  compact  and  higher  in  temperature  than  the  ordinary  Bunsen  flame.     Com- 
plete with  tripod  for  supporting  dishes,  etc. 

No A  B  C 

Bore  of  horizontal  tube,  inches %  %  % 

Gas  consumption  per  hour,  feet 2  3%  7 

Each   90        1.30        1.70 

2070.  BURNERS,  Fletcher's  Evaporating,  made  of  solid  copper  with  lap  joints.  An  excellent  burner 
for  heating  flasks  or  beakers,  as  it  is  free  from  cold  spots  or  cold  air  currents,  nor  does  the 
direct  flame  come  in  contact  with  the  glass.  Height,  about  1%  inches  in  all  sizes. 

No A  B  C 

Diameter,  inches 4  5  6% 

Each   2.10        2.80        3.50 

207?.    BURNERS,  Fletcher's  Evaporating,  same  construction  as  No.  2070,  but  of  east  iron. 

No A  B  C 

Diameter,  inches 4  5  6% 

Each    1.40         1.70         2.80 

2074.  BURNER,  Fletcher's  Low  Temperature,  giving  a  complete  range  of  temperature  from  a  gentle 

current  of  warm  air  to  a  clear  reft  heat,  under  perfect  control.  For  very  low  temperatures 
the  ring  must  be  lighted  through  the  opening  B.  For  boiling,  the  light  is  applied  to  the  sur- 
face of  the  gauze,  providing  a  large  body  of  blue  flame,  the  temperature  of  which  is  controlled 
by  forcing  air  through  blast  pipe  C.  Total  height,  6%  inches;  diameter,  5  inches;  gas  con- 
sumption per  hour,  25  feet 2.80 

2075.  BURNER,   Fletcher's  Low  Temperature,   same  as  No.  2074  without  blast  pipe  C 2.40 

2078.     BURNERS,  Fletcher's  Radial,  of  cast  iron,  easily  cleaned. 

No A  B 

Diameter  of  ring,  inches 3%  5 

Diameter  of  stand,  inches 6*4  8 

Gas  consumption  per  hour,  cu.  ft 12  18 

Each    2.10         2.80 

2080.     BURNERS,  Fletcher's  Radial,  for  gasoline  gas,  same  as  No.  2078,  but  with  capnut  regulator. 

No A  B 

Each    '. ' 3.20         3.80 

2082.  BURNER,  Fletcher's  Solid  Flame,  for  quick  heating  of  large  surfaces.  Diameter  of  flame  sur- 
face, 4%  inches;  gas  consumption  per  hour,  35  feet 2.20 

2084.  BURNER,  Fletcher's  Solid  Flame,  same  as  No.  2082,  but  for  gasoline  gas,  with  cap-nut  regulator. 

4.00 

2085.  PERFORATED  CAPS,  Copper,  for  Nos.  2082  and  2084 each        .75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


117 


No.  2108. 

_<'SS.     BURNER,  Gas  Stove,  round  portable,  with  cast  iron  top  and  base,  and  Russia  iron  body.     Steel 
drip   pan  is  beneath   burner   and   top  is   raised.       Total    height,    4%     inches;     diameter,     9 

inches    $1.45 

2090.    BtTRNER,  Gas  Stove,  same  as  No.  2088,  with   valve   and   air   regulator   for   burning   gasoline 

gas     3.75 

2092.     BURNER,   Gas   Stove,   similar   to   No.    2088,  but   of   simpler   construction.     Total   height,   4% 

inches;  extreme  length,  12H  inches;  diameter  across  dish  support,  6  inches 1.10 

2094.     BURNERS,  Gas  Stove,  with  radial  burners.     Finished  in  black  japan  and  nickel-plate.     For 
coal  gas  unless  otherwise  specified. 

No A  B  C 

Number  of  burners 1  2  3 

Size  of  top  plate,  inches 12x12     12x22     12x32 

Each 4.60        7.75      10.30 

2096.     BURNERS,  Glass  Blowers'  Fires,  on  base  with  four  legs  for  attachment  to  table  top,  with  gas 
and  air  inlet  tubes  horizontal. 

No ABO 

Number  of  lights '. 1  2  3 

Per  set  of  two 9.00      14.00       18.00 

2098.  BURNERS,  Glass  Blowers'  Fires,  same  as  No.  2096,  but  with  gas  and  air  inlet  tubes  vertical. 

No A  B  C 

Number  of  lights 1  2  3 

Per  set  of  two 9.00      14.00      18.00 

2099.  BURNER  TIP  for  glass  blowers '  fires,  concave    70 

21n2.     BURNER,  Greenman,  for  use  with  Greenman  Thermo-Eegulators.  .  So  constructed  that  the  gas 

cannot  strike  back  nor  can  soot  be  deposited  when  flame  is  low.    With  adjustment  for  size  of 
flame  and  threaded  inlet  for  connection  with  metallic  tubing 12.50 

2103.  BURNER  TUBING,  of  soft  brass,  with  %  inch  I.  P.  size  coupling  at  each  end,  to  connect  Bur- 

ner No.  2102  to  metal  gas  supplv  tube. 

No '. A             B  C 

Length,  inches 30            48  60 

Each   2.30  2.85  3.50 

BURNER  TUBING,  flexible  steel,  see  Nos.  11624  and  11626. 

2104.  BURNER,  niuminating,  for  table  illumination,  glass- bending,  etc.    Height,  12  inches 1.70 

2106.     BURNER,  niuminating,  similar  to  No.  2104.  but  with  Welsbach  burner  and  mica  chimney,  as 

used  at  the  University  of  Chicago.     Height,  10  inches  from  table  to  center  of  light....      2.50 
2108.     BURNER,  Low  Form,  extra  large,  with  gauze  top.    Height,  5  inches;  diameter,  2%  inches;  ex- 
treme length,  14  inches.    A  valuable  burner  for  use  in  heating  sterilizers  and  incubators     2.85 


118 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2112. 


No.  2118. 


No.  2124. 


No.  2126.        No.  2132. 


No.  2128. 


2110.  BURNERS,  Ring  Form,  with  air  regulator,  to  be  attached  to  support  by  means  of  a  right  angle 
clamp,  such  as  No.  2914. 

No .- A  B  C  D 

Diameter,  inches 3  4  5  6 

Each   $1.70      1.90        2.20        2.60 

2112.  BUHNER,  Roger's  Ring,  for  heating  platinum  crucibles  without  bumping  while  evaporating 
strong  solutions.  Flame  is  applied  to  upper  part  of  crucible  only.  Complete  with  platinum 

triangle  of  No.  26  wire 7.50 

BURNERS,  Soldering  Iron  Heater,  simple  construction,  cast  iron  base,  with  Russia  iron  hood. 
Total  height,  6'/2  inches;  extreme  length,  14  inches. 

2114.  For  artificial  gas 2.45 

2115.  For  gasoline  gas 3.50 

2116.  For  natural  gas 3.50 

Burners,  Adjustable,  for  Use  With  Coal,  Gasoline  or 
Natural  Gas. 

2118.  BURNER,  Bunsen,  with  adjustment  for  air  and  gas.  Height,  6  inches;  diameter  of  tube,  %6 
inch  : 1.10 

2120.  BURNER,  Bunsen,  adjustable,  improved  form.  Height,  6%  inches;  diameter  of  tube,  % 
inch 1.70 

2122.  BURNER,  Bunsen,  adjustable,  same-as  No.  2120,  but  without  base.  Length,  6%  inches;  dia- 
meter of  tube,  %  inch 1.50 

2124.  BURNER,  Boyce's  Acme  Safety,  with  adjustment  for  air  and  gas.  Construction  such  that  flame 
cannot  strike  back.  Height,  6%  inches;  diameter  of  tube,  yw  inch 1.65 

2126.  BURNER,  Boyce's  Adjustable,  with  improved  regulator  for  air  and  gas.  One  of  the  best  low 
priced  burners  for  eoal,  gasoline,  or  natural  gas,  as  the  tube  is  stationary,  permitting  all  burner 
attachments  to  be  used  with  it  to  the  best  advantage .67 

2128.  BURNER,  Detroit  Adjustable,  for  coal,  gasoline  and  natural  gas.  Height,  6  inches;  diameter  of 
tube,  %  inch 1.25 

2130.    BURNERS,  Teclu's,  with  regulator  for  air  and  gas,  furnishing  a  very  large  and  hot  flame. 

No A  B 

Height  of  burner,  inches 6          7% 

Diameter  of  tube,  inches %  % 

Each   1.90        2.80 

2132.  BURNER,  Tirrill'S,  substantially  constructed,  all  of  brass,  with  regulators  for  air  and  gas.  Con- 
sidered one  of  the  best  burners  made  for  use  with  coal,  natural  or  gasoline  gas.  Height,  6 
inches;  diameter  of  tube,  %6  inch 1.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


119 


2138. 


No.  2150. 


No.  2152. 


No.  2154. 


No.  2155. 


Burners,  High  Temperature. 

Bu KNEES,  High  Temperature,  of  grid  type,  with  air  and  gas  regulator,  suitable  for  coal,  gaso- 
line or  natural  gas. 

No A  B  C 

Height,   inches 6  6% 

Diameter  of  grid,  inches..  %  1  1% 

Each   $1.50       2.00        2.60 

2140.    BURNER,  High  Temperature,  Quadruple,  consisting  of  four  of  the  No.  2138A  Burners  mounted 

on  a  common  supply  tube.     Useful  in  heating  combustion  and  muffle  furnaces 10.00 

2144.  BURNERS,  High  Temperature,  of  Meker  type  with  adjustment  for  air  and  gas.  Constructed 
of  brass  with 'grid  top. 

No 3  \ 

Height  of  burner,  inches 6%          7% 

Diameter  of  flame,  mm 25  30 

Each    3.00        3.50 

2146.  BURNERS,  Braun's  Vulcan  Non-Blast,  for  coal  or  natural  gas,  for  use  with  Braun  Furnaces. 
These  are  non-blast  burners  operating  without  noise  and  upon  regular  gas  pressure.  They 
are  so  designed  as  to  secure  a  correct  mixture  of  gas  and  air  to  produce  the  most  intense 
heat.  Temperatures  up  to  2100°F.,  have  been  obtained.  Each  tube  consumes  about  50  cubic 
feet  of  gas  per  hour.  Complete  with  regulating  valve  for  each  burner. 

No A  B  C  D 

Number  of  burner  tubes 1  2  3  4 

Each    3.26         7.25       10.50       12.50 

Burners,  Blast. 

2150.  BURNER,  Blast,  Braun  Gas,  for  use  with  artificial  or  natural  gas.  Designed  for  use  with  Fur- 
naces Nos.  6300  and  6398.  Requires  a  blower  to  furnish  sufficient  amount  of  air.  (See  No. 
6400).  Should  be  connected  to  a  %-inch  gas  supply  line  Shipping  weight,  18  pounds.  Com- 
plete with  air  and  gas  valves 15.50 

.2152.  BURNER,  Blast,  Bunsen's  style,  with  three  interchangeable  gas  tips  and  with  stop-cocks  on  gas 
and  air  inlet  tube.  An  excellent  lamp  for  ordinary  laboratory  use.  Can  be  adjusted  in  height 
from  8  to  10  inches.  For  coal  gas  only 5.40 

2154.  BURNER,  Blast,  Bunsen's,  extra  large  size,  on  adjustable  stand,  with  two  tips.    For  coal  gas 

only     10.00 

2155.  BURNER,  Blast,  similar  in  construction  to  Bunsen's  but   with  needle   valves  instead   of   stop- 

cocks.    Mounted  on  ball  and  socket   joint,  with  set  of  three  gas  tips  and  two  sleeves.     Can 
be  used  with  coal,  gasoline  or  natural  gas 6.00 


120 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2182. 


No.  2186. 


No.  2172. 


2156.  BUHNER,  Blast,  Fletcher's  Compound,  with  range  from  a  delicate  pointed  jet  to  a  large  brush 
flame;  mounted  on  adjustable  heavy  cast  base.  Flame  easily  controlled  by  lever  which  adjusts 
both  air  and  gas  automatically.  Especially  valuable  in  glass  working.  For  coal  gas 

only $12.75 

2158.  BURNERS,  Blast,  Fletcher's  Injector,  for  heating  gas  furnaces.  Can  be  used  with  coal,  gaso- 
line or  natural  gas.  No A  B 

Gas   consumption   per  hour,   feet 42  60 

Each    2.50         3.50 

2160.    BURNERS,  Blast,  Meker  Type,  with  short  inlet  tube  for  air.    For  coal  gas  only. 

No 2  4 

Height  of  burner,  mm 135          190 

Diameter  of  flame,  mm 20  30 

Each    4.70         7.00 

2162.  BURNER,  Blast,  Wiesnegg,  or  French  form,  with  stop-cocks.  Mounted  on  ball  joint.  Com- 
plete with  three  gas  tips.  For  coal  gas  only  6.50 

BURNERS,  Blast,  Brazing,  see  Blowpipe  No.  1444. 

BURNERS  FOR  .LIQUID  FUELS 

Burners,  Alcohol. 

2170.      BURNERS,  Alcohol  Lamps,  of  glass,  with  ground  cap,  wick  and  wick  holder. 

Capacity,  ounces 4  8 

Each 22  .36 

2172.  BURNERS,  Alcohol  Lamps,  of  brass,  with  screw  cap,  wick  and  wick  holder. 

Capacity,  ounces 4  8 

Each 85  1.10 

2173.  BURNER  WICKS,  for  alcohol  burners  Nos.  2170  and  2172 Per  dozen  .10 

2174.  BURNER  WICK  HOLDERS,  brass,  for  No.  2170   Per  dozen  .40 

2175.  BURNER  CAPS,  of  glass,  for  No.  2170.     No A  B 

For  burner,  ounces 4  8 

Per  dozen 1.00  1.00 

2178.  BURNER,  Alcohol  Lamp,  of  glass  with  nine  facets  on  the  font,'  enabling  it  to  be  placed  in  any 
position.  Provided  with  wiek  %  inch  in  diameter,  giving  a  much  hotter  flame  than  ordinary 

alcohol  lamps  .90 

LU79.      BURNER  WICKS  for  No.  2178 Per  dozen         .50 

2182.  BUHNER,  Barthel's  Automatic,   for  alcohol;  requires  no  wick;  very  powerful.    Flame  is  equiv- 

alent to   2  Bunsen  burners.     Complete  with  1%  meters  flexible  steel  tubing  and  reservoir  of 
1  liter  capacity.     Without  tripod 10.00 

2183.  FLEXIBLE  TUBING  for  No.  2182  in  1V2  meter  lengths Per  length         .60 

2186.     BURNERS,  Barthel's  Alcohol  Stove,  enameled   finish   with   brass   reservoir;    no   wick   required. 

Safe,  smokeless;  size  of  flame  readily  adjusted.     Capacity  of  reservoir,  %  liter. 

No A  B 

Number  of  burners 1  2 

Each    5.00  9.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


121 


No.  2211G. 


No.  2208. 


No.  2200. 


2190.  BURNER,  Alcohol  Blast,  double  jet  type.  Produces  needle  pointed  flame  of  great  heat,  over 
3000°F.  Burner  swivelled  so  as  to  be  turned  in  any  position.  Capacity,  1  pint;  consump- 
tion, H  pint  per  hour $9.35 

2192.  BURNER.  Alcohol  Stove,  of  brass  nickel-plated,  with  invisible,  indestructible  -wick.  Very 
powerful,  producing  no  smoke  or  odor.  Weight,  8  ounces;  capacity,  7  ounces 1.00 

2194.  BURNER,  Alcohol  Stove,  as  used  on  Moisture  Testers;  noiseless,  economical  and  safe.  Burns 
with  intensely  hot,  blue,  smokeless  flame  for  three  hours  on  one  charge.  The  best  alcohol 
stove  substitute  for  a  broad  gas  flame.  Flame  adjustable  in  height 3.50 

Burners,  Gasoline  and  Kerosene. 

2200.  BURNER,  Baby  Gasoline  Torch,  of  brass,  nickel-plated.  Fits  the  hand  and  can  be  used  in  ap- 
position. Automatic  in  action,  without  valves  or  pump.  Burns  two  hours  with  one  filling. 

Capacity  of  reservoir,  1  pint 1.65 

REPAIR  PARTS  FOR  No.  2200. 

2201A.  Burner  Tube 35  2201D.  Straight  Neck 85 

2201B.  Tip  Nut 35  2201E.  Fiber  Washer 05 

2201C.  Cleaning  wire 08  2201F.  Tank 1.30 

2201G.  Wick  and  Strip 16 

2206.  BURNER,  Laboratory  Blast  Lamp,  for  gasoline.  The  tank  is  of  heavy  seamless  drawn 'brass,  with 
brass  pump  in  handle;  the  burner  is  of  special  bronze  alloy.  The  flame  is  intensely  hot,  and 
can  be  regulated  from  small  point  to  large  brush.  An  excellent  substitute  for  the  Bunsen 
burner  or  gas  blast  lamp.  Capacity  of  adjustable  tank,  1  pint;  total  height  of  burner,  7 
inches  7.50 

2208.  BURNER,  Adjustable  Laboratory  Blast  Lamp,  for  gasoline.     Similar  in  construction  to  No.  2206, 

but  mounted  on  swivel  stand  so  that  flame  can  be  pointed  in  any  direction,  and  raised  or 
lowered.  The  pump  is  of  brass  mounted  inside  the  tank  and  is  automatic  in  action.  Complete 
with  adjustable  tripod,  which  can  be  swung  out  of  the  wav  when  not  in  use 10.40 

2209.  BLAST  LAMP  only  of  Xo.  2208 ." 7.00 

2210.  STAND  only  of  Xo.  220S 4.15 

REPAIR  PARTS  FOR  Nos.  2206  AND  2208. 

2211A.  Burner  Body,  Needle  and  Drip  Cup,  for  either  Xo.  2206  or  Xo.  2208 3.30 

i'211B.  Filler  Plug  for  either  Xo.  2206  or  Xo.  2208 .45 

L'211C.  Drip  Cup  for  either  Xo.  2206  or  Xo.  2208 .70 

2211D.  Feed  Pipe  for  Xo.  2206 25 

2211F.  Pump  for  Xf>.  2206 1.50 

2211G.  Pump  for  Xo.  2208 1.50 

2211H.  Cup  Leathers  for  Xo.  2206  or  Xo.  2208 Each  .10 


122 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2211S. 


No.  2211U. 


No.  2215. 


No.  2211V. 


No.  2220. 


No.  2214. 


2211J.   Hexagon  Nuts,  any  size  for  No.  2206  or  No.  2208 - Each     $0.05 

2211K.  Pump  Caps  for  No.  2206  or  No.  2208 Each         .12 

2211L.  Plunger  Knobs  for  No.  2206  or  No.  2208 Each         .12 

2211M.  Cork  Washers  for  No.  2206  or  No.  2208 Each         .02 

2211N.  Springs  for  No.  2206  or  No.  2208 Each         .02 

2211P.  Cork  Holder  for  No.  2206  or  No.  2208 10 

2211Q.  Spring  Plates  for  No.  2206  or  No.  2208 Each         .10 

2211R.  Plunger  Bod  for  No.  2206  or  No.  2208 15 

22118.  Plunger  Rod,  complete  with  knob,  cap  and  slide  for  No.  2206  or  No.  2208 50 

2211T.  Pump  Collar  for  No.  2206  or  No.  2208 20 

2211U.  Pump  Bottom  for  No.  2206  or  No.  2208 50 

2211V.  Pump  Slide  for  No.  2206  or  No.  2208 30 

2214.  BUHNERS,  Gary's  Gasoline  Blast,  producing  intensely  hot,  clean  flame.     Recommended  for  use 

in  heating  Furnaces  Nos.  6390  and  6398. 

No A  B 

J)iameter,  inches 1%  2 

Each 13.25      15.75 

2215.  GASOLINE  TANK  OUTFIT  for  use  with  No.   2214,  with  heavy  iron   tank,   tinned   inside   and 

out  to  prevent  rusting  and  tested  to  a  pressure  of  100  pounds.  Fitted  with  large  brass  hand 
pump  on  separate  base.  Complete  with  12  feet  of  14 -inch  iron  pipe,  pressure  gage,  two 
swivel  joints,  necessary  valves  and  fittings,  but  without  burner. 

No A  B 

Capacity  of  tank,  gallons 2  7 

Shipping   weight,    pounds 50  70 

Each    31.50       42.00 

Prices  of  extra  parts  for  No.  2215  quoted  on  application. 

2218.      BURNER,  Dangler's  Gasoline  Blast  Lamp,  flame  easily  adjustable.     With  tin  reservoir,  holding 
%  gallon.     Complete  with  rubber  pressure  bulb.     Height  of  burner,  10%  inches;  height  to  top 

of  support  rod,  17  inches;  diameter  of  reservoir,  7  inches 9-00 

BULBS,  Rubber,  for  No.  2218,  see  No.  11530. 
2220.     BURNER,  Kerosene  Stove,  wickless,  giving  hot  blue  flame,  without   smoke   or  odor.     Height, 

8%  inches;  diameter  of  base,  9  inches.    Without    stand 7.50 

2221      STAND  for  No.  2220,  with  top  8%  inches  in   diameter 90 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


123 


No.  2226. 


Ko.  2228. 


No.  2230. 


No.  2234. 


No.  2236. 


No.  2238. 


No.  2246. 


No.  2240. 


No.  2250. 


No.  2242. 


No.  2252. 


No.  2248. 


BURNER  ACCESSORIES 

2226.  BURNER  BLOWPIPE  ATTACHMENT,  to  fit  on  a  %6  inch  burner  tube.  Takes  the  place  of 
both  blowpipe  and  blowpipe  tip,  leaving  both  hands  free.  Should  be  used  with  rubber  tube 

and   glass   mouthpiece 50.90 

2228.      BURNER  BLOW  PIPE  TIP,  with  rest,  for  blowpipe,  fitting  outside  %6  inch  burners 16 

2230.      BURNER  BLOW  PIPE  TUBE,  for  yellow  flame,  fitting  inside  %6  inch  burners 18 

2232.  BURNER  CHIMNEY,  of  Russia  iron,  to  protect  flame  from  drafts,  for  use  with  No.  2246  Star 
Support.  Diameter  at  bottom,  2  inches;  at  top,  1%  inches;  height,  2  inches 15 

2234.      BURNER  CHIMNEYS,  of  Russia  iron,  with  attached  support. 

No A  B 

For  burner  tube,  diameter,  inches tfa  >£ 

Each  .80  .85 

2236.      BURNER  CROWN  TOP,  giving  round  flame,  for  heating  dishes;  diameter,  1  inch .50 

2238.     BURNER  FORK  for  attaching  burner  to  ring  stand 30 

2240.      BURNER  GAUZE  TOP,  giving  large  round  flame;  diameter,  1%  inches .26 

2242.  BURNER  GUARD,  of  vitrified  earthenware  for  protecting  a  flame  from  drafts.  Will  also  be 
found  a  rigid  and  convenient  support,  measuring  9  inches  high,  8  inches  diameter  at  base,  5 
inches  diameter  at  top.  Provided  with  hole  for  rubber  tubing  and  inlets  for  air  to  support 

combustion    50 

2246.      BURNER  STAR  for  supporting  No.  2232  Chimney    .26 

2248.     BURNER  SUPPORTS,  of  iron,  with  heavy  screw  for  clamping  on  supports  or  tripods. 

No A  B 

Diameter,   inches 3%  5 

Each 25          .60 

2250.      BURNER  TRIPODS  for  holding  dishes,  measuring  2%  inches  between  supporting  points. 

No A  B 

For  burner  tube,  diameter,  inches ^6  % 

Each   16  .18 

BURNER  TUBING,  see  Rubber  Tubing. 
2°5°       BURNER  WING  TOPS  for  use  in  bending  glass  tubing. 

No : .  A  B 

For  burner  tube,  diameter,  inches %6  % 

Each  .  09  .18 


124 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


No.  2312. 


No.  2308.      No.  2310. 


No.  2314. 


i^ 


No. 

2300. 
2302. 

2304. 
2306. 
2308. 
2310. 
2312. 
2314. 
2316. 
2318. 
2320. 


2300.       No.  2302.  No.  2316.       No.  2318. 

CALCIUM  CHLORIDE  TUBES 


No.  2320. 


CALCIUM  CHLORIDE  JARS,  Drying  Towers,  on  foot,  with  tubulature  near  bottom. 

Height,  inches 8  10  12 

Each  $1.80  2.50  3.20 

CALCIUM  CHLORIDE  JARS,  similar  to  No.  2300,  but  with  perforated  ground  glass   stopper 
and  side  tube  near  top. 

Height,  inches 

Each   

CALCIUM  CHLORIDE  TUBES,  one  bulb,  straight  delivery  tube. 

Length  to  bottom  of  bulb,  inches 4  6 

Diameter  of  tube,  inches %  94 

Each 11  .13 

CALCIUM  CHLORIDE  TUBES,  two  bulbs,  straight  delivery  tube. 

Length  to  bottom  of  first  bulb,  inches 4  6 

Diameter  of  tube,  inches %  % 

Each 13  .15 

CALCIUM  CHLORIDE  TUBES,  with  small  inner  tube  to  collect  moisture  in  first  bulb. 

Length  to  bottom  of  first  bulb,  inches 4 

Diameter  of  tube,  inches % 

Each 25 

CALCIUM  CHLORIDE  TUBES,  U  shape,  plain. 

Length,  inches 4 

Diameter  of  tube,  inches % 

Each 12 

CALCIUM  CHLORIDE  TUBES,  U  shape,  with  side  tubes. 

Length,  inches 

Diameter  of  tube,  inches 

Each   

CALCIUM  CHLORIDE  TUBES,  U  shape,  with  side  tubes  and  bulb  on  one. 

Length,  inches 4 

Diameter  of  tube,  inches % 

Each  ... 25 

CALCIUM  CHLORIDE  TUBES,  Marchand's,  with  cork  and  connecting  tube. 

Length,  inches , 

Diameter  of  tube,  inches , 

Each 

CALCIUM  CHLORIDE  TUBES,  Peligot's,  U  shaped  with  three  bulbs. 

Length,  inches 4 

Diameter  of  tube,  inches , % 

Each    30 

CALCIUM  CHLORIDE  TUBES,  Schwartz,  with  side  tubes  and  perforated  ground  in  glass  stoppers. 

No A  B 

Length,  inches '        4  6 

Diameter  of  tube,  inches %.  % 

Each 1.40  1.75 

CALIBRATING  BXJRETTES,  see  Burettes. 

CALIBRATING  PIPETTES,  see  Pipettes. 


6 
% 
.20 

4 
% 
20 


10 
4.50 

8 
.16 

8 

.18 

Ib. 
8 

.36 

8 
.25 

0 

% 

.25 

6 
% 
.35 

4 
.30 

6 
% 
.40 


12 
4.80 

10 
.22 

10 
.24 

10 
.40 

10 
.40 

8 
.35 

8 
.50 

6 
.35 

8 
.70 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A, 


125 


No.  2328.  No.  2330. 


No.  2332.  No.  2336. 


No.  2338. 


No.  2340. 


No.  2342. 


No.  2348. 


No.  2354, 


No.  2356. 


2328.     CALIPEE,  Inside.     Polished  steel.     Length,  15  em. $0.35 

2330.     CALIPEE,  Outside.     Polished  steel.     Length  15  em 35 

2332.     CALIPEE,  Double.     Inside  and  outside.     Polished  steel.     Length,  15  cm 40 

2336.  CALIPEE,  Eegistering,  Double.     Inside  and  outside.    Nickel-plated.    Total  length,  15  cm.      1.35 

2338.     CALIPEE,  Spring,  Inside.    Even  tension,  solid  nut.     Polished  steel.     Length,  12.5  cm 1.00 

2340.     CALIPEE,  Spring,  Outside.     Even  tension,  solid  nut.     Polished  steel.     Length,  12.5  em LOO 

2342.     CALIPEE,  Micrometer,  Metric.     This  caliper  will  measure  all  sizes  up  to  25  mm,  and  is  gradu- 
ated to  read  to  0.01  mm.     It  is  provided  with  a  friction  head  so  that  all  measurements  are  made 
with  the  same  degree  of  pressure 6.50 

2344.     CALIPEE,  Micrometer,  Metric,  for  measurements  up  to  25  mm,  graduated  to  read  to  0.01  mm. 
Provided  with  a  ratchet  stop,  same  as  No.  2348  7.50 

2346.     CALIPEE,  Micrometer,  Metric,  for  measurements  up  to  25  mm,  graduated  to  read  to  0.01  mm. 
Similar  to  No.  2344,  but  with  neither  friction  head  nor  ratchet  stop 6.50 

2348.     CALIPEE,  Micrometer,  English,  for  measurements  up  to  1  inch,  graduated  to  read  tc  0.001  in. 
Provided  with  ratchet  stop 7.50 

2350.     CALIPEE,  Micrometer,  English,  for  measurements  up  to  1   inch,  graduated  to  read  to  C.i/01  in. 
Similar  to  No.  2342,  but  with  neither  friction  head  nor  ratchet  stop 6.50 

2352.     CASE  for  Micrometer  Caliper,  covered  with  morocco  leather  and  lined  with  velvet.     Will  hold 
either  No.  2344,  No.  2346,  No.  2348  or  No.  2350 75 

2354.  CALIPEE,  Vernier,  of  steel;  length,  over  16  cm;  the  most  complete  vernier  caliper  on  the  mar- 
ket. Inside  caliper,  outside  caliper  and  depth  gauge  combined.  Graduated  to  5  inches  in  16th 
inch  divisions  and  to  12  centimeters  in  millimeter  divisions;  reading  by  verniers  to  1/128  inch 
and  1/10  millimeter.  Thumb  attachment  for  easy  operation.  Neat,  accurate  and  durable  4.00 

2356.  CALIPEE,  Vernier,  of  steel,  same  as  No.  2354  with  the  addition  of  a  micrometer  screw  adjustment. 
6.00 

2337.  CASE  for  Vernier  Caliper,  leather.     Will  hold  either  No.  2354  or  No.  2356. .  .70 


126 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


No.  2360. 


No.  2376. 

CALORIMETERS 


No.  2378. 


2360. 


CALORIMETER,  Parr  Standard,  for  determining  the  heat  units  in  coal,  coke,  lignite  and  oils. 
The  most  rapid  and  convenient  apparatus  for  measuring  the  calorific  power  of  fuels.  Requires 
no  special  skill  in  manipulation  and  no  complicated  connections  to  oxygen  tanks,  etc.  Outfit 
is  readily  portable,  being  self-contained.  Bequires  power  to  operate  stirrer,  which  can  be  fur- 
nished by  water  motor  or  electric  motor.  Determinations  can  be  quickly  made,  requiring  not 
more  than  20  minutes  to  complete  a  test  on  a  prepared  sample.  The  bomb  or  combustion  cup 
furnished!  is  made  of  a  special  alloy  which  resists  the  action  of  the  melted  sodium  peroxide, 
and  can  be  used  continuously.  An  arrangement  is  made  whereby  the  water  is  not  admitted  to 
contact  with  the.  bomb  until  the  fusion  is  completed,  thus  insuring  the  complete  combustion  of 
the  sample.  A  further  advantage  of  this  calorimeter  is  the  fact  that  sulphur  and  total  carbon 
may  be  easily  determined  from  the  fused  product  of  the  combustion  by  the  Sulphur  Photometer 
(see  No.  2378),  and  the  Total  Carbon  Apparatus  (see  No.  2376).  Two  interchangeable  fusion 
cups  are  furnished  enabling  duplicate  determinations  to  be  made.  Complete  with  thermometer 
reading  from  65°  to  90°F.  in  1/20°  divisions  with  Bureau  of  Standards  certificate,  reading  lens 
with  support,  two-liter  measuring  flask,  chemical  receptacle,  measuring  cup,  100-mesh  5  inch 
brass  sieve  with  bottom,  forceps,  camel  hair  brush,  ignition  wire,  chemicals  sufficient  for  fifty 

determinations  and  battery  for  ignition,  but  without  motor $85.00 

Accessories  and  Parts  for  Parr  Standard  Calorimeter. 

2361.  ELECTRIC  MOTOR,  variable  speed,  for  110  volts  A.  C.  or  D.  C.  mounted  on  support 23.00 

2362.  ELECTRIC  MOTOR,  variable  speed,  for  220  volts  A.  C.  or  D.  C.  mounted  on  support 23.00 

2363.  WATER  MOTOR  and  Support 5.00 

13533 A.  THERMOMETER,  65°  to  90°  F.,  in  i,£0°  divisions,  with  Bureau  of  Standards  certificate. . .   12.00 
13533B.  THERMOMETER,  65.°  to  105°  P.,  in  i£0°  divisions,  with  Bureau  of  Standards  certificate . . .   15.00 

2366.  ADJUSTABLE  RHEOSTATS,  for  use  with  lighting  circuit  in  place  of  battery  to  reduce  voltage 

to  safe  limit  for  ignition. 

No ; A  B 

For  volts   110  220 

Total  resistance,  ohms 50  90 

Each    ;...      7.50  8.50 

2367.  IGNITION  WIRE  for  electric  ignition per  card       .75 

2368.  BOMB  for  Electric  Ignition,  complete  with  wrenches 35.00 

13730.  READING  LENS,  with  support 3.00 

13731.  READING  LENS  only,  without  support 2.00 

2371.  SODIUM  PEROXIDE,  a  special  quality  put  up  for  use  with  the  Parr  Calorimeter,  in  metal  con- 

tainer. 

Size,  pounds    %  %  1 

Each   1.10  1.95  3.00 

2372.  ACCELERATOR per  2  ounce  bottle     1.00 

2373.  GASKETS  for  bomb per  dozen       .40 

2376.     TOTAL  CARBON  APPARATUS,  Parr,  for  total  carbon  in  coal,  coke,  etc.,  in  connection  with  the 

Parr  Standard  Calorimeter.  By  adding  acid  to  the  dissolved  residue  from  the  combustion, 
which  appears  as  sodium  carbonate,  carbon  dioxide  is  liberated  and  measured  under  proper 
conditions.  Complete  with  full  directions  for  use  52.00 

2378.  SULPHUR  PHOTOMETER,  Parr,  for  use  in  connection  with  the  Parr  Standard  Calorimeter, 

for  readily  indicating  the  percentage  of  sulphur  in  coal,  coke,  and  petroleum.  The  fused  mass 
obtained  from  the  calorimeter  bomb  is  dissolved  in  water  and  the  sulphur  precipitated  by 
means  of  barium  chloride.  From  the  depth  of  the  liquid  in  the  graduated  tube  at  which  the 
light  from  the  flame  disappears,  a  reading  is  obtained  directly  which  indicates  the  percentage 
of  sulphur  in  the  sample ". 40.00 

2379.  BARIUM  OXALATE  for  use  with  No.  2378 per  2  ounce  bottle      .75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


127 


No.  2382. 

2382.  CALORIMETER,  Parr  Oxygen  Bomb,  a  new  instrument  of  the  Berthelot-Mahler  type  with  a 
bomb  made  of  the  new  acid-resisting  alloy  lllium.  This  metal  has  proved  by  means  of  tests 
extending  over  several  years  to  be  equivalent  to  or  better  than  platinum  for  calorimetric  work. 
This  feature  renders  unnecessary  any  costly  lining  of  gold  or  platinum,  and  consequently  makes 
the  Parr  outfit  the  most  economical  of  the  bomb  calorimeters  recognized  as  standard.  The  new 
bomb  is  also  entirely  free  from  the  corrosion  to  which  the  platinum-lined  steel  bombs  are  sub- 
ject, and  eliminates  the  annoyance  due  to  the  chipping  and  cracking  of  the  enamel  in  porcelain- 
lined  bombs.  A  rubber  gasket  is  substituted  for  the  lead  of  the  old  type,  and  a  check  valve 
with  rubber  seat  replaces  the  needle  valve.  The  calorimeter  can  is  oval  in  shape  permitting 
the  use  of  a  rotary  stirrer  which  quickly  distributes  the  heat  and  obviates  any  temperature  lag. 
Complete  with  lllium  bomb,  water  container,  insulating  vessel  of  indurated  fibre  with  cover  of 
same,  rotary  stirrer,  pressure  gage  and  needle  valve  with  oxygen  connection  and  couplings, 
octagon  socket  for  bomb,  spanner  wrench,  six  capsules  of  special  alloy,  reading  lens  and  sup- 
port, special  ignition  wire  and  gaskets,  but  without  thermometer  or  motor.  (See  Report  of  the 
Joint  Committee  of  the  American  Chemical  Society  and  American  Society  for  Testing  Ma- 
terials, in  the  Journal  of  Industrial  and  Engineering  Chemistry,  Vol.  IX,  No.  1,  for  Januarv 
1917)  ". $285.00 

Accessories  and  Parts  for  Parr  Oxygen  Bomb  Calorimeter. 

2361.  ELECTRIC  MOTOR,  variable  speed,  for  110  volts  A.  C.  or  D.  C 23.00 

2362.  ELECTRIC  MOTOR,  variable  speed,  for  220  volts  A.  C.  or  D.  C 23.00 

13533 A.  THERMOMETER,  65°  to  90°  F.,  in  Ho°  divsions,  with  Bureau  of  Standards  certificate. .  .   12.00 
13533B.  THERMOMETER,  65°  to  105°  F.,  in  H0°  divsions,  with  Bureau  of  Standards  certificate. . .   15.00 
13519.  THERMOMETER,  Beckmann  Differential,  with  range  of  o  to  6  degrees  graduated  to  Moo°c-»  ^th 

Bureau  of  Standards  certificate 32.50 

2384.  BOMB  only  of  lllium  alloy 210.00 

2385.  WATER  CONTAINER   10.00 

2386.  INSULATING  VESSEL,  of  fiber,  with  cover,  stirrer  and  pulley 30.00 

2387.  PRESSURE  GAGE,  with  needle  valve,  oxygen  connections  and  couplings 6.50 

2388.  OCTAGON  SOCKET  for  bomb " 3.50 

2389.  SPANNER  WRENCH 6.50 

13730.  READING  LENS,  with  support 3  00 

13731.  READING  LENS  only,  without  support 2  00 

2367.     IGNITION  WIRE  .  . '. per  card  .75 

2390.  GASKETS  for  Valve. per  dozen  .90 

2391.  GASKETS  for  Union per  dozen  .25 

2392.  CAPSULES,  of  lllium  alloy each  3.50 


128 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2394. 


2394.  CALORIMETER,  Parr  Adiabatic  Oxygen  Bomb.     An  entirely  new  adiabatic  system  is  employed 

which  insures  a  degree  of  accuracy  not  possible  with  pneumatic  or  vacuum  methods.  Water  is 
kept  circulating  constantly  throughout  the  cover  and  on  all  sides  of  the  jacket,  the  tempera- 
ture of  which  is  under  the  positive  control  of  the  operator.  By  turning  the  proper  valve, 
either  cooler  or  warmer  water  is  instantly  admitted  and  immediately  distributed  throughout" 
the  jacket  permitting  the  operator  to  keep  the  temperature  controlled  in  either  direction  to 
correspond  absolutely  with  that  in  the  calorimeter  proper.  This  is  a  feature  not  found  in  any 
other  commercial  calorimeter.  By  this  means  errors  due  to  radiation  or  to  conductivity  lag  are 
eliminated  and  the  use  of  calculations  made  unnecessary.  The  cover  is  pivoted  so  that  it 
swings  out  of  the  way  in  a  horizontal  plane,  carrying  the  thermometer  with  it,  thus  reducing 
the  danger  of  breakage  to  a  minimum.  The  water  container  and  bomb  are  the  same  as  those 
employed  in  the  Oxygen  Bomb  Calorimeter  No.  2382.  Complete  with  water  container,  Illium 
bomb,  adiabatic  water  jacket,  rotary  stirrers,  pressure  gage  and  needle  valve  with  oxygen  con- 
nection and  couplings,  octagon  socket  for  bomb,  spanner  wrench,  six  capsules  of  special  alloy, 
reading  lens  and  support,  special  ignition  wire  and  gaskets,  but  without  thermometer,  motor, 
heater,  or  heater  burner $375.00 

Parts  and  Accessories  for  Parr  Adiabatic  Oxygen  Bomb  Calorimeter. 

2395.  HEATER  for  water  supply  system 25.00 

2397.  HEATER  BURNER   1.00 

2398.  ELECTRIC  MOTOR,  variable  speed,  for  110  volts  A.  C.  or  D.  C 28.00 

2399.  ELECTRIC  MOTOR,  variable  speed,  for  220  volts  A.  C.  or  D.  C 28.00 

For  other  parts,  see  those  listed  under  Parr  Oxygen  Bomb  Calorimeter  No.  2382. 

Note: — If  desired  by  those  who  are  accustomed  to  using  only  platinum  lined  bombs,  we  shall  be 
glad  to  quote  prices  on  a  special  platinum  lined  Illium  bomb.  The  advantages  of  this  over  the 
usual  platinum  lined  steel  bomb  are  obvious. 

2400.  PELLET  PRESS  and  Mold,  complete,  for  preparing  fuel  pellets  for  calorimetric  determinations 

20.00 

OXYGEN  CYLINDERS  for  use  with  Oxygen  Bomb  Calorimeter,  see  Gas,  Oxygen. 
CALORIMETERS,  Gas,  see  Gas  Analysis  Apparatus. 
CANS,  Sample,  see  Boxes. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


129 


No.  2410. 


No.  2422. 


No.  2426  (shown  in  use) . 


No.  2428. 


2408.     CAPSULES,  Best  American  Porcelain,  as  used  in  milk  analysis,  ash  determination  in  flour,  etc. 


No. 


1 

13 
45 
12 

$0.25 


3 

25 
69 
13 
.35 


4 
45 
72 
16 
.40 


2410. 


2411. 
2412. 
2413. 
2414. 


2415. 

2416. 
2418. 

2422. 
2424. 
2426. 


2427. 
2428. 


With  straight  sides  and  flat  bottom,  glazed  throughout. 

Capacity,  cc 

Diameter,  mm 

Height,  mm 

Each   

CAPSULES,  Combustion,  see  Combustion  Capsules. 

CARBON  BATHS,  see  Water  Baths. 

CARBON  DISSOLVING  TUBES,  see  Test  Tubes. 

CARBON  DIOXIDE  DETERMINATION  APPARATUS 

CARBON  DIOXIDE  APPARATUS,  Barker,  for  the  determination  of  carbonates  in  limestone, 
fertilizers,  soda  baking  powders,  etc.  The  outfit  consists  chiefly  of  a  special  hydrometer,  in 
the  bulb  of  which  is  a  reservoir  for  acid  and  a  reaction  chamber  for  the  carbonate.  No  bal- 
ances are  required,  as  the  change  in  weight  is  read  directly  in  percentage  of  carbon  dioxide 
on  the  graduated  stem.  It  is  suitable  for  any  carbonate  containing  more  than  5  per  cent,  car- 
bon dioxide,  and  permits  an  accuracy  as  great  as  in  the  standard  laboratory  method.  A  cer- 
tificate of  accuracy  is  furnished  with  each  outfit.  Complete  with  special  hydrometer,  jar, 
thermometer,  graduated  cylinder,  dropping  pipette,  and  one  pound  of  hydrochloric  acid  in 

glass  stoppered  bottle ; 12.00 

HYDROMETER  only  of  No.  2410 9.00 

CARBON  DIOXIDE  APPARATUS  ( Alkalimeter) ,  Bunsen's 1.20 

CARBON  DIOXIDE  APPARATUS  (Alkalimeter),  Geissler's  new  form,  with  ground  joint! .     1.20 

CARBON  DIOXIDE  APPARATUS  (Alkalimeter),  Knorr's,  for  determination  of  carbonic  acid  in 

carbonates,  especially  baking  powder,  recommended  by  the  Association  of  Official  Agricultural 

Chemists.     All  joints  are  ground  together 11.40 

CARBON  DIOXIDE  APPARATUS,  same  as  No.  2414,  but  with  rubber   connections   instead   of 

ground  joints 9.00 

CARBON  DIOXIDE  APPARATUS  (Alkalimeter),  Mchr's,  with  two  ground  joints 3.30 

CARBON  DIOXIDE  APPARATUS  (Alkalimeter),  Schroedter's,  with  tube  in  flask  3.80 

CARBON  FILTER  TUBES,  see  Filter  Funnels. 

CARBOY,  Glass,  in  rubber  cushioned  crate,  capacity  5  gallons 3.50 

CARBOY,  Glass,  boxed,  capacity  10  gallons 10.00 

CARBOY  INCLINATOR,  Flaherty's.  A  lever  locks  the  carboy  to  the  inelinator,  and  on  account 
of  the  shape  of  the  rockers  the  carboy  always  returns  to  an  upright  position  when  released.  A 

very  convenient  method  of  tilting  a  heavy  carboy 8.50 

CARDBOARD,  Bristol  Board,  best  quality  for  drawing,  in  sheets  11x14  inches. .  Each  .05 

Per  dozen      .35 
CASSEROLES,  Best  American  Porcelain,  with  lip  and  porcelain  handle,  glazed  with  exception  of 

rim.   No 1         3    3A   4    4A    5     6     7 

Capacity,  cc 30   75   150   210   375   500   750   1250  2000 

Outside  diameter,  mm 50   70   85   95   110   120   135   165   175 

Each 35   .40   .50   .70   .90   1.15   1.40   2.00   3.50 


130 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2430. 


No.  2432. 


No.  2448. 


2480. 


2432. 


2434. 


CASSEROLES,  Porcelain,  lipped,  with  porcelain  cover  and  wooden  handle. 

Capacity,  cc 125          250          375  500 

Diameter,   mm 90  105  110  120 

Each $0.50  .60  .75  1.00 

CASSEROLES,  Agateware,  with  handle. 

Manufacturer 's  rated  capacity,  ounces 16 

Each   25 

CASSEROLES,  Opaque  Fused  Silica,  with  handle  and  lip. 

No A  B  C 

Capacity,  cc 30  150 

Diameter,  mm 51  70 

Depth,  mm 25  35  44 

Each  . .                                                    2.20  2.70  3.30 


750 
152 
1.50 


32 
.30 


D 

200 

95 

51 

4.25 


1000 
172 
1.70 


64 
.36 


E 

350 
108 

63 
5.50 


2436. 


CATHETOMETERS,  see  CATALOG  F  OF  PHYSICAL  APPARATUS. 

CEMENT,  ALUNDUM  REFRACTORY,  for  use  in  repairing  muffles,  cores,  electric  furnaces,  and  in 
general  wherever  a  refractory  cement  of  high  thermal  conductivity  is  desirable.  Used  exten- 
sively for  covering  resistance  wire  in  electric,  furnaces.  When  mixed  with  water  to  make  a 
thick  paste  it  is  ready  for  use.  Furnished  in  three  mixtures,  RA  162  for  general  work,  RA  355 
where  a  fine  grained  cement  is  required,  and  RA  305,  for  use  where  a  cement  with  a  vitrifying 
point  of  500°  C.  is  needed.  Unless  specified  when  ordering,  mixture  RA  162  will  be  furnished. 

In  lots  of,  pounds 1  5  10 

Mixture  RA  162 , 40  .75  1.30 

Mixture  RA  355 50  1.25  2.50 

Mixture  RA  305 50  1.25  2.50 

CEMENT,  Asbestos,  see  Asbestos  Cement,  No.  308. 

CEMENT,  De  Khotinsky  Laboratory.  This  well-known  cement  is  not  attacked  by  water,  sul- 
phuric, nitric  or  hydrochloric  acids,  bisulphide  of  carbon,  benzine,  gasoline  or  turpentine,  and 
is  very  little  affected  by  ether,  chloroform,  caustic  alkalies,  etc.  Comes  in  small  sticks  of  about 
1  oz.,  large  sticks  of  about  2  oz.  and  in  bulk  by  the  pound.  Prepared  in  three  different  grades 
as  follows:  Hard  for  cementing  glass,  metal  and  porcelain;  medium  for  cementing  and  in- 
sulating purposes;  soft  for  insulating  and  covering  electric  wires,  for  condensers,  static  ma- 
chines, protection  against  corrosion  and  for  cementing  rubber,  hard  rubber,  wood,  ivory,  etc. 

No A  B  C 

Size Small  Stick.         Large  Stick.         Pound. 


2440.  CEMENT,  De  Khotinsky  Laboratory,  Hard 

2441.  CEMENT,  De  Khotinsky  Laboratory,  Medium. 

2442.  CEMENT,  De  Khotinsky  Laboratory,  Soft. . . . 


.55 
.55 
.55 


1.10 
1.10 
1.10 


6.60 
6.60 
6.60 


2443.  CEMENT,  De  Khotinsky  Black,  Medium.     For  imitating   Niello    or   producing   decorations   on 

metals  by  filling  in  engraved  lines,  letters,  and  figures.  This  cement  does  not  shrink  or  sink 
below  the  surface  of  the  metal  with  time,  and  after  polishing  gives  the  luster  and  appearance 
of  black  enamel.  In  sticks  of  about  J/£  ounce  Per  stick  .30 

2444.  CEMENT,  De  Khotinsky  Black,  Soft,  similar  to  No.  2443,  but  with  a  lower  melting  point.     In 

sticks  of  about  %  oz Per  stick         .30 

2446.  CEMENT,  Loxol,  for  joining  or  mending  china,  glass,  metal,  wood,  and  for  electrical  insulation. 
In  8  oz.  cans Per  can  .50 

2448.  CEMENT,  Quixo  or  Liquid  Porcelain.  When  dry  it  is  not  affected  by  fire  or  water.  K  will 
cement  all  articles  except  India  rubber,  vulcanite,  celluloid  and  black-lead.  Excellent  for  build- 
ing aquaria,  making  labels,  etc.  In  6-ounce  cans  Per  can  .25 

CEMENT.  Rubber,  see  Rubber  Cement. 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


131 


No.  2466. 


No.  2460. 


No.  2462D. 


CEMENT  TESTING  APPARATUS 

AUTOCLAVES  for  Cement,  see  general  heading  Autoclaves. 
BALANCES  for  Cement,  see  general  heading  Balances. 
2454.     BRIQUETTE  MOLD,  American  Society  for  Testing  Materials  Type,  of  brass  with  end  clamps  $3.50 

2456.  BRIQUETTE  MOLD,  American  Society  for  Testing  Materials  Type,  of  brass  with  iron  horseshoe 

clamp 3.50 

2457.  IRON  HORSESHOE  CLAMP  only  for  No.  2456 40 

2460.     BRIQUETTE  MOLD,  Improved  Form,  American  Society  for  Testing  Materials  Type,  for  separ- 
ating sections  without  rapping $3.50 

2462.  BRIQUETTE  GANG  MOLDS,  American  Society  for  Testing  Materials  Type,  of  brass  with  end 
and  center  clamps. 

No A  B  C  D  E 

Number  of  briquettes 23456 

Each 7.00  10.00  13.50  16.50  20.00 

2464.     BRUSH,  of  brass  wire  in  wood  handle  for  cleaning  briquette  molds.     Length  of  brush  portion,  5 

inches 75 

2466.  COMPRESSION  TESTING  MACHINE,  Olsen's  Hydraulic  Hand  Power,  designed  to  meet  the  de- 
mand for  a  low  priced  compression  machine  for  cement  and  concrete.  The  pressure  is  obtained 
by  forcing  a  cylindrical  ram  into  the  oil  cylinder  of  the  machine  by  means  of  a  hand  wheel  and 
worm  gear.  A  spherical  bearing  is  employed  in  mounting  the  table  which  enables  it  to  adjust 
itself  to  the  faces  of  the  specimen  in  order  to  transmit  the  pressure  uniformly.  The  load  on 
the  specimen  at  all  times  is  shown  by  a  hydraulic  gage  connected  to  the  oil  cylinder.  The 
platens  are  scribed  with  concentric  circles  to  facilitate  centering  the  specimen  and  are  large 
enough  to  hold  a  6  inch  cube,  with  an  extreme  distance  of  6%  inches  between  faces.  Size  of 
machine:  30  inches  long,  30  inches  wide  and  72  inches  high.  Weight,  1000  pounds.  Capacity, 

40,000  pounds  F.  O.  B.  Philadelphia  350.00 

Note: — This  machine  is  furnished  to  order  only  and  we  cannot  promise  immediate  delivery. 


132 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2478. 


No.  2470. 


No.  2476. 


2468.  GILLMORE  NEEDLES  in  block,  for  determining  both  the  initial  and  the  final  set  of  cement. 
They  consist  of  a  pair  of  steel  needles,  one,  i/j2  inch  in  diameter  loaded  with  a  weight  of  Vi 
pound,  and  the  other  i£4  inch  in  diameter  loaded  with  a  weight  of  one  pound $6.00 

2470.  GILLMORE  NEEDLES,  same  as  No.  2468,  but  with  vertical  support  to  keep  the  needles  perpen- 
dicular to  the  surface  of  the  pat '. 6.00 

MOIST  CHAMBER  for  Cement,  of  soapstone,  furnished  to  order.  Prices  on  application. 

2472.  MOLDS,  Cylindrical,  brass,  for  preparing  cylinders  used  in  determining  the  compressive  strength 

of  Portland  cement  mortars.     Diameter,  2  inches;  height,  4  inches.     (See  Tentative  Standard 
of  the  American  Society  for  Testing  Materials  C  9  — 16  T) 8.00 

2473.  TAMPER,  Steel,  for  use  with  No.  2472.     Weight,  about  %  pound;  length,  6%  inches;  diameter 

at  top,  %  inch;  at  bottom,  1  inch 3  50 

2476.     MOLD,  Cylindrical,  cast  iron,  with  detachable  base  plate  and  hinged  clamps,  machined  to  size. 

Diameter,  8  inches;  depth,  16  inches 27.50. 

2478.     MOLDS,  Cube,  of  brass,  with  hinge  clamp  for  preparing  cubes  for  compression  tests. 

No A  B 

For  cubes,  inches 1  2 

Each 3.50  4.50 

2480.     MOLD,  Cube,  of  iron,  hinged,  for  6  inch  cubes,  with  detachable  base  plate 9.00 

2482.     MOLDS,  Cube,  of  brass,  same  as  No.  2478,  but  in  gangs  of  2  molds. 

No A  B 

For  cubes,  inches 1  2 

Each 3.00  4.00 

2486.     MOLD,  Pat,  for  forming  pats  of  neat  cement  intended  for  steaming  tests 2.50 

2488.     PAN,  of  galvanized  iron,  for  immersing  briquettes  in  water  before  testing.     Size,  24x24x3  inches 

1.50 

2490.     PLATE,  of  heavy  glass,  for  use  in  mixing  cement  and  filling  briquette  molds.     Size,  24x24  inches 

„ 4.50 

SAMPLE  CANS  for  Cement,  see  Boxes  No.  1828. 

2496.  SAND,  Standard,  for  cement  testing,  according  to  the  American  Society  for  Testing  Materials 
per  100  pound  bag  4.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


133 


No.  2500. 


No.  2512. 


No.  2498. 


2498.     SOUNDNESS  TEST  APPARATUS,  Le  Chatelier,  for  indicating  the  soundness  of  cement  by  its 

expansion  after  being  boiled $3.50 

2500.  SPECIFIC  GRAVITY  APPARATUS,  Jackson's,  for  the  accurate  determination  of  the  specific 
gravity  of  cement.  Consists  of  a  special  burette  calibrated  to  give  specific  gravity  readings 
directly,  and  a  special  flask  with  ground  in  funnel.  (See  Journal  of  the  Society  of  Chemical 

Industry,  Vol.  XXIII,  Xo.  11,  for  June  15,  1904)   7.00 

SPECIFIC  GRAVITY  BOTTLES  for  Cement,  see  Bottles,  Specific  Gravity. 

2502.  STEAMING  APPARATUS,  of  polished  copper,  tinned  on  inside,  for  boiling  and  steaming  cement 
specimens  for  determining  soundness.  Size,  15x15x30  inches.  Mounted  on  sheet  iron  support, 

with  shelf  of  wire  screen  and  gas  burner 37.50 

1614G.  CONSTANT  LEVEL  BOTTLE  for  use  with  No.  2502.     Capacity,  2  gallons 3.00 

2504.     TAMPER  for  uniformly  packing  cement  in  briquette  molds 12.00 

2506.  TESTING  MACHINE,  Olsen  New  Automatic,  for  tension  tests,  the  latest  type  of  automatic  shot 
cement  tester.  The  shot  is  used  to  counterbalance  the  heavy  weight,  and  when  it  is  removed 
the  tension  produced  is  applied  to  the  briquette.  The  shot  is  caught  in  a  container  on  a  bal- 
ance which  indicates  on  a  special  graduated  dial  the  force  applied  up  to  the  time  of  rupture, 
when  the  flow  of  shot  is  automatically  shut  off.  The  action  and  weighing  of  shot  is  absolutely 
automatic,  requiring  no  reweighing  to  determine  the  load  applied.  Size:  24  inches  long,  10 
inches  wide,  and  30  inches  high.  Weight,  150  pounds;  capaeitv,  1000  pounds. 

P.  O.  B.  Philadelphia  200.00 

Note: — This  machine  is  furnished  to  order  only  and  we  cannot  promise  immediate  delivery. 

2508.  TESTING  MACHINE,  Olsen  Improved  Automatic,  for  tension  tests.     Same  as  No.  2506," but  pro- 

vided with  a  crank  in  the  base  for  applying  a  steady  tension  to  the  briquette  in  order  to  hold 
the  beam  in  equilibrium  throughout  the  test.  Size:  40  inches  long,  11  inches  wide  and  36 

inches  high.     Weight,  170  pounds;  capacity,  2000  pounds F.  O.  B.  Philadelphia  350.00 

Note: — This  machine  is  furnished  to  order  only  and  we  cannot  promise  immediate  delivery. 

2509.  LEAD  SHOT  for  use  with  Xos.  2506  and  2508 per25  pound  bag    5.00 

2512.     TROWELS  for  mixing  cement. 

Length  of  blade,  inches 3  4 

Each 50  .60 

2514.  VIC  AT  NEEDLE  APPARATUS,  Bramwell  Improved  Form,  for  determining  the  normal  consist- 

ency and  setting  time  of  cement  according  to  the  methods  recommended  by  the  American 
Society  for  Testing  Materials.  The  needles  are  on  opposite  ends  of  the  300  gram  plunger  rod, 
the  change  being  made  by  reversing  the  rod.  Diameter  of  large  needle,  1  cm;  diameter  of 
small  removable  needle,  1  mm 20.00 

2515.  RUBBER  MOLD  onlv  for  No.  2514 3.00 


134 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2534. 


No.  2536. 


No.  2524. 


No.  2542. 


CENTRIFUGES 


CENTRIFUGES,  HAND  AND  WATER  MOTOR 

2524.  CENTRIFUGE,  Hand  Driven,  high  speed,  giving  from  1,000  to  3,000  revolutions  per  minute,  for 
the  rapid  and  accurate  analysis  of  urine,  sputum,  blood,  pus,  milk  and  the  precipitation  of  solids 
in  any  liquid.  The  case  is  of  iron,  well  finished,  the  bearings  accurate,  the  gear  wheels  cut  by 
special  machinery,  and  the  pitch  so  calculated  as  to  render  the  machine  almost  noiseless.  Com- 
plete with  two  aluminum  shields,  one  each  15  ec  plain  and  graduated  glass  tubes $11.00 

2526.  CENTRIFUGE,  Hand  Driven,  same  as  No.  2524,  but  with  arm  for  holding  four  tubes.  Complete 
with  four  aluminum  shields,  two  each  15  ce  plain  and  graduated  tubes.  This  machine  is  capable 
of  doing  the  work  of  two  ordinary  centrifuges 17.25 

2528.  CENTRIFUGE,  Hand  Driven,  samo  as  No.  2524,  with  two  tubes  for  the  examination  of  urine  and 
with  haematocrit  for  the  examination  of  blood  and  sputum 18.00 

2530.  CENTRIFUGE,  Hand  Driven,  same  as  No.  2526,  with  four  tubes  for  the  examination  of  urine  and 
with  haematocrit  for  the  examination  of  blood  and  sputum 22.50 

2532.  CENTRIFUGE,  Water  Motor,  for  attachment  to  ordinary  smooth  faucet.  Speed  is  controlled  by 
flow  of  water.  So  constructed  that  bearings  cannot  become  rusted  nor  can  oil  be  washed  out. 
Noiseless  in  operation.  Each  machine  is  furnished  with  aluminum  shields,  3  feet  pressure  tub- 
ing, and  hose  connection  for  attachment  to  smooth  faucet.  Complete  with  2-tube  15  cc  head, 
two  aluminum  shields,  and  one  each  15  cc  plain  and  graduated  glass  tubes 12.00 

2534.  CENTRIFUGE,  Water  Motor,  same  as  No.  2532,  but  with  four-tube  15  ce  head,  four  aluminum 
shields,  and  two  each  15  ce  plain  and  graduated  glass  tubes 18.80 

2536.  CENTRIFUGE,  Water  Motor,  same  as  No.  2532,  but  with  two-tube  50  cc  head  for  the  examina- 

tion of  kerosene  or  liquids  where  larger  quantities  are  to  be  tested.     Complete  with  aluminum 

shields,  and  two  50  cc  graduated  glass  tubes   21.00 

Accessories  for  Hand  and  Water  Motor  Centrifuges. 

2537.  TWO-TUBE  HEAD  for  15  cc  tubes,  without  shields  or  glass  tubes 4.35 

2538.  FOUR-TUBE  HEAD  for  15  ce  tubes,  without  shields  or  glass  tubes 6.85 

2539.  TWO-TUBE  HEAD  for  50  ce  tubes,  without  shields  or  glass  tubes 7.80 

2540.  FOUR-TUBE  HEAD  for  50  ce  tubes,  without  shields  or  glass  tubes 13.80 

2541.  TWO-TUBE  HEAD,  Goetz,  for  phosphorus  determinations  in  steel,  with  metal  shields,  but  with- 

out glass  ware 12.60 

2542.  HAEMATOKRIT,  with  two  tubes  each  for  examination  of  blood  and  sputum 7.25 

2543.  PERCENTAGE  TUBE  for  Blood  Analysis,  for  No.  2542 90 

2544.  SPUTUM  TUBE  for  No.  2542 36 

2545.  DROPPER,  new  construction,  for  filling  the  blood  tubes 25 

2546.  GRADUATED  URINE  TUBES,  15  cc each  .65 

per  dozen    6.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


135 


2547. 

2548. 
2549. 

2550. 
2551. 
2552. 
2553. 

2554. 
2555. 


2557. 
2558. 
2559. 


get 


No.  2548.     No.  2551.      No.  2553.  No.  2555.  No.  2556. 


No.  2570. 

PLAIN  URINE  TUBES,  15  cc each  $0.20 

per  dozen    2.00 

GRADUATED  TUBE,  length  4^  inches,  outside  diameter  ii^c  inch,  graduated  to  10  ec.  . .       .40 
PLAIN  TUBE,  same  as  No.  2548,  but  ungraduated,  length  of  tube  4%  inches,  outside  diametef 


ll/10  inch 


.20 


ALUMINUM  SHIELD  for  15  ce  tubes 30 

GOETZ  TUBE  for  phosphorus  determinations,  with  graduated  tip 1.10 

METAL  SHIELD  for  carrying  No.  2551  Goetz  Tube 1.10 

CEMENT  TUBE,  with  50  cc  graduation,  with  tip  graduated  to  %o  ce,  for  cement  testing  and  for 

use  where  the  proportion  of  sediment  is  extremely  small 1.50 

METAL  SHIELD,  for  carrying  No.  2553  Cement  Tube 1.10 

TUBE  FOR  MILK  ANALYSIS,  graduated  for  obtaining  a  reliable  test  of  either  breast  or  cow's 

milk.  It  will  give  results  accurate  to  within  i£  of  1  per  cent,  of  fat 65 

CONICAL  TUBE,  graduated  to  50  cc,  for  use  in  testing  kerosene  and  other  liquids  where  larger 

quantities  are  to  be  tested  than  can  be  carried  in  a  15  ee  tube 1.00 

CONICAL  TUBE,  plain,  same  as  No.  2556  without  graduations 50 

ALUMINUM  SHIELD  for  carrying  Nos.  2556  and  2557 85 

SPEED  INDICATOR  3.00 

CENTRIFUGES  for  Oil,  see  Oil  Testing  Apparatus. 

CENTRIFUGES,  ELECTRIC 
CENTRIFUGES,  VICTOR 

After  a  careful  investigation  we  have  selected  the  Victor  line  of  electric  centrifuges  because  of  their 
superiority  in  the  following  important  respects: — 

1.  The  electric  motor,  which  is  the  heart  of  any  centrifuge,  is  carefully  made,  obviating  any  elec- 
trical troubles,  such  as  burn-outs,  overheating,  loose  contacts,  etc. 

2.  The  shaft  is  accurately  centered,  preventing  vibration. 

3.  The  motor  is  so  wound  that  by  shifting  a  single  contact  in  the  base,  it  can  be  changed  from  an 
A.  C.  to  a  D.  C.  motor.    It  is  not  a  universal  motor. 

4.  The  centrifuge  head  is  carefully  balanced  and  weighted  so  as  to  produce  a  smooth  uniform  mo- 
tion, without  any  jerk  in  starting  or  stopping. 

5.  The  relation  between  speed,  weight,  and  centrifugal  force   has   been  worked   out  with  mathe- 
matical exactness  so  that  one  can  instantly  determine  what  centrifuge  to  procure  in  order  that  a  given 
force  may  be  exerted  on  the  suspended  particles. 

6.  The  construction  and  finish  of  these  centrifuges  are  such  as  to  afford  the  greatest  protection 
from  chemical  reagents. 

7.  A  complete  line  of  accessory  parts,  including  glassware,  is  available. 

2570.     CENTRIFUGE,  Victor  No.  3,  with  motor  entirely   enclosed  in  enameled  iron   jacket.      Can   be 
operated  on  either  110  volt  A.  C.  or  D.  C.  by  shifting  a  single  connection  in  the  base.     Complete 
with  two-tube  head  of  heavy  construction,  with  attached  trunnion  rings,  two  conical  aluminum 
shields  for  15  cc  tubes,  and  attachment  cord  and  plug,  without  glassware. 
Specifications : — • 

Height  over  all,  12  inches.  B.  P.  M.  (A.  C.)  1500. 

Width  over  all,  rotating,  15  inches.  Relative  force  (times  gravity)  325. 

Weight,  23  pounds.  R.  P.  M.  (D.  C.)  1800. 

Average  spread,  26  cm.  Relative  force  (times  gravity)  469. 

Price  $32  00 

2572.    CENTRIFUGE,  Victor  No.  3,  same  as  No.  2570,  but  arranged  for  220  volts  A.  C.  and  D.  C.     35.00 


136 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2580  with  No.  2588. 


2574.     CENTRIFUGE,  Victor  No.  3,  same  as  No.  2570,  but   equipped  with   four-tube  head   and  four 

aluminum  shields  for  15  ec  tubes,  without  glassware. 
Specifications  same  as  No.  2570,  except: — 

B.  P.  M.  (A.  C.)  1350.  R.  P.  M.  (D.  C.)  1400. 
Relative  force  264.  Relative  force  286. 

Price   $34.50 

2576.     CENTRIFUGE,  Victor  No.  3,  same  as  No.    2574,  but  arranged  for  220  volts  A.  C.  and  D.  C.    37.50 
2578.     RHEOSTATS  for  controlling  speed  of  No.  3  Centrifuges. 

No A  B 

For  volts   110  220 

Each    3.60  3.60 

For  other  ACCESSORIES,  see  list  at  end  of  section  on  Victor  Centrifuges. 

2580.  CENTRIFUGE,  Victor  No.  2,  similar  to  No.  2570,  but  of  heavier  construction,  can  be  operated  at 
a  higher  speed,  will  handle  larger  volumes  of  liquid,  and  has  a  rheostat  in  the  base  by  means 
of  which  three  different  speeds  may  be  obtained.  The  motor,  arranged  for  both  110  volts  A. 

C.  and  D.  C.,  is  entirely  enclosed  in  an  iron  jacket,  enameled  with  black  acid-proof  finish.     Com- 
plete with  two-tube  head  with  attached  trunnion  rings,  two  conical  aluminum  shields  for  15  cc 
tubes,  and  attachment  cord  and  plug,  without  glassware. 

Specifications : — 

Height  over  all,  15  inches.  R.  P.  M.  (A.  C.)  with  Protective  Dome  No.  2588,  2800. 

Diameter  over  all,  10  inches.  Relative  force,  780. 

Weight,  22V2  pounds.  R.  P.  M.  (D.  C.)  with  Protective  Dome  No.  2r>8S,  3300. 

Average  spread,  18  em.  Relative  force,  1050. 

Price  43.70 

2582.     CENTRIFUGE,  Victor  No.  2,  same  as  No.  2580,  but  arranged  for  220  volts  A.  C.  and  D.  C.  46.70 
2584.     CENTRIFUGE,  Victor  No.  2,  same  as  No.  2580,  but  with  four-tube  head  with  attached  trunnion 

rings,  four  conical  aluminum  shields,  and  attachment  cord  and  plug,  without  glassware. 
Specifications : — 

Height  over  all,  15  inches.  R.  P.  M.  (A.  C)  with  Protective  Dome  No.  2588,  2.100. 

Diameter  over  all,  10  inches.  Relative  force  620. 

Weight,  22i/2  pounds.  R.  P.  M.  (D.  C.)  with  Protective  Dome  No.  2588,  3000. 

Average  spread,  18  cm.  Relative  force  900. 

Price  47.50 

2586.     CENTRIFUGE,  Victor  No.  2,  same  as  No.  2584,  but  arranged  for  220  volts  A.  C.  and  D.  C.  50.50 

2588.  PROTECTIVE  DOME,  of  heavy  spun  copper,  polished,  with  closely  fitting  lid  with  handle.     Can 

be  easily  attached  to  any  Victor  No.  2  Centrifuge.  The  use  of  this  dome  permits  a  higher  speed, 

and  eliminates  danger  to  the  operator 10.50 

Accessories  for  No.  2  Centrifuges. 

2589.  TWO-TUBE  HEAD,  with  attached  trunnion  rings  and  50  cc  round  bottomed  bronze  shields,  with 

rubber  cushions   9.70 

2590.  TWO-TUBE  HEAD,  with  Babcock  trunnion  cups  and  rubber  cushions,  for  determining  the  per- 

centage of  butter-fat  in  milk  or  cream 11.40 

For  other  ACCESSORIES,  see  list  at  end  of  section  on  Victor  Centrifuges. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


137 


2596. 
2598. 


2600. 
2602. 


2604. 
2606. 


20"-. 


Nos.  2594-2608. 


CENTRIFUGE,  Victor  No.  4,  for  heavy  work  and  wide  range  of  speed.  The  motor,  arranged  for 
both  110  volts  A.  C.  and  D.  C.,  is  entirely  shut  off  from  the  centrifuge  chamber,  eliminating  any 
danger  of  ignition  of  combustible  vapors  from  sparking.  The  protective  dome  is  cast  as  an 
integral  part  of  the  motor  housing,  and  is  provided  with  a  heavy  hinged  lid.  A  rheostat  in  the 
base  permits  five  different  ranges  of  speed.  A  variety  of  multiple  tube  heads  may  be  used  and 
greater  speed  can  be  obtained  than  with  the  No.  2  or  No.  3.  Complete  with  four-tube  head 
with  attached  trunnion  rings,  four  15  cc  round  bottomed  bronze  shields  with  rubber  cushions, 
and  attachment  cord  and  plug,  without  glassware. 
Specifications : — 

R.  P.  M.  (A.  C.),2300. 

Relative  force  (times  gravity),  830. 

R.  P.  M.  (D.  C.),  2700. 

Relative  force  (times  gravity),  1140. 


Height  over  all  with  cover  closed,  18%  inches. 
Height  over  all  with  cover  open,  29%  inches. 
Width  over  all,  18%  inches. 
Weight,  100  pounds. 
Average  spread,  28  cm. 
Price  . 


$105.70 

CENTRIFUGE,  Victor  No.  4,  same  as  No.  2594,  but  arranged  for  220  volts  A.  C  and  D.  C.    109.20 
CENTRIFUGE,  Victor  No.  4,  same  as  No.  2594,  but  with  eight-tube  head  with  attached  trunnion 

rings  and  eight  15  ce  round  bottomed  bronze  tubes  with  rubber  cushions. 
Specifications  same  as  No.  2594,  except: — 

R.  P.  M.  (A.  C.),  2300.  R.  P.  M.  (D.  C.),  2600. 

Relative  force  (times  gravity),  830.  Relative  force  (times  gravity),  1060. 

Price   ." 113.15 

CENTRIFUGE,  Victor  No.  4,  same  as  No.  2598,  but  arranged  for  220  volts  A.  C.  and  D.  C.  116.65 
CENTRIFUGE,  Victor  No.  5,  similar  in  construction  to  No.  2594,  but  with  specially  powerful 

motor,  designed  to  take  care  of  all  work  from  the  lightest  to  the  very  heaviest.     The  motor, 

aranged  for  both  110  volt  A.  C.  and  D.  C.,  is  enclosed  in  the  same  frame  as  the  No.  4,  but  is 

capable  of  a  much  wider  range  of  speed.     Complete  with  five  point  rheostat  for  regulating 

speed,  large  oil  wells  easily  accessible,  four- tube  15  ce  head  with  attached  trunnion  rings,  four 

15  ce  round  bottomed  bronze  tubes,  and  attachment  cord  and  plug. 
Specifications : — 

Height  over  all  with  cover  closed,  18%  inches. 

Height  over  all  with  cover  opened,  29%  inches. 

Diameter  over  all,  18%  inches. 

Weight,  105  pounds. 

Average  spread,  28  cm. 

Price  118.20 

CENTRIFUGE,  same  as  No.  2602,  but  arranged  for  both  220  volts  A.  C.  and  D.  C 121.20 

CENTRIFUGE,  same  as  No.  2602,  but  with  eight-tube  15  cc  head  with  attached  trunnion  rings, 

and  eight  15  cc  round  bottom  bronze  tubes  with  rubber  cushions. 
Specifications  same  as  No.  2602,  except: — 

R.  P.  M.  (A.  C.),  3400.  R.  P.  M.  (D.  C.),  3600. 

Relative  force,  1810.  Relative  force,  2000. 

Price  125.65 

CENTRIFUGE,  same  as  No.  2606.  but  arranged  for  both  220  volts  A.  C  .and  D.  C 128.65 


R.  P.M.  (A.  C.),  3700. 

Relative  force  (times  gravity),  2140. 

R.  P.  M.  (D.  C.),  4000. 

Relative  force  (times  gravity),  2460. 


138 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  2615. 


No. 
2632. 


No. 
2633. 


No. 
2634. 


No.        No.     No.      No.     No.      No.     No. 
2635.      2649.   2650.    2651.  2652.    2653.  2656. 


2611. 
2612. 
2613. 
2614. 
2615. 
2616. 
2619. 


2627. 
2628. 
2629. 
2630. 

2631. 
2632. 

2633. 
2634. 
2635. 


2646. 
2647. 
2648. 

2649. 
2650. 
2651. 
2652. 
2653. 
2656. 
2657. 

2658. 
2659. 


Accessories  for  Nos.  4  and  5  Victor  Centrifuges. 
FOUR-TUBE  HEAD,  with  attached  trunnion  rings  and  four  15  ce  round  bottomed  bronze  tubes 

with  rubber  cushions • $10.20 

FOUR-TUBE  HEAD,  with  attached  trunnion  rings  and  four  50  ec  round  bottomed  bronze  tubes 

with  rubber  cushions 15.10 

EIGHT-TUBE  HEAD,  with  attached  trunnion  rings  and  eight  15  cc  round  bottomed  bronze  tubes 

with  rubber  cushions 17.65 

EIGHT-TUBE  HEAD,  with  attached  trunnion  rings  and  eight  50  ce  round  bottomed  bronze  tubes 

with  rubber  cushions 26.45 

FOUR-TUBE  COMBINATION  HEAD,  with  trunnion  rings,  two  15  cc  and  two  50  ec  round  bot- 
tomed bronze  tubes  with  rubber  cushions 12.65 

EIGHT-TUBE  COMBINATION  HEAD,  with  trunnion  rings,  four  15  cc  and  four  50  cc  round  bot- 
tomed bronze  tubes  with  rubber  cushions 23.05 

TRUNNION  RINGS  for  Heads  Nos.  2611  to  2616. 

No A  B 

For  tubes,  cc 15  50 

Each 35  .90 

Assessories  Which  Can  Be  Used  With  Victor  Centrifuges  Nos.  2,  4,  and  5. 
BRONZE  SHIELD,  round  bottom,  for  50  cc  glass  tubes  for  use  with  No.  2619B  Trunnion  Ring, 

including  Bubber  Cushion  No.  2628 75 

RUBBER  CUSHIONS  for  No.  2627  Shield each  .18 

per  dozen    1.80 
BABCOCK  TRUNNION  CUP  for  use  with  Heads  Nos.  2589,  2612  and  2614,  including  No.  2630 

Cushion 1.50 

RUBBER  CUSHIONS  for  No.  2629  Cup each  .15 

per  dozen    1.45 

BUSHING  for  reducing  size  of  No.  2627  Shield  to  take  15  ce  tubes 60 

GLASS  TUBES,  50  ec,  plain,  with  lip each  .15 

per  dozen    1.50 
GLASS  TUBES,  50  ce,  graduated each  .80 

per  dozen    8.00 
GLASS  TUBES,  50  cc,  plain,  narrow  neck each  .20 

per  dozen    2.00 
HART  CASEIN  GLASS  TUBES,  50  cc each  .50 

per  dozen    5.00 
BABCOCK  MILE  TEST  BOTTLES,  see  Milk  Testing  Apparatus. 

Accessories  Which  Can  Be  Used  With  Any  Victor  Centrifuge. 

ALUMINUM  SHIELD  for  15  cc  glass  tubes,  with  conical  bottom 35 

BRONZE  SHIELD  for  15  cc  glass  tubes,  with  round  bottom  and  rubber  cushion 55 


RUBBER  CUSHIONS  for  No.  2647  Shields each 


.15 


per  dozen    1.50 


GLASS  TUBES,  15  cc,  plain,  with  conical  bottom each 

per  dozen 
GLASS  TUBES,  15  cc,  plain,  round  bottom each 


.15 
1.50 
.10 
per  dozen     1.10 


GLASS  TUBES,  15  cc,  graduated,  with  conical  bottoms each 

per  dozen 
GLASS  TUBES,  15  cc,  plain  with  narrow  neck each 


.55 
5.50 
.20 
per  dozen    2.00 

HOPKINS  VACCINE  TUBES,  10  ec each  2.20 

per  dozen  22.00 

BABCOCE  TEST  TUBES  for  human  milk each  .90 

per  dozen    9.90 

RUBBER  CAPS  for  Tubes  Nos.  2649,  2650,  and  2651 each  .20 

per  dozen    2.20 

SPEED  INDICATOR 3.30 

PEDESTAL,  specially  designed  for  Victor  Centrifuges.     Dimensions:    height,  19  inches;  spread 
over  all,  24  inches;  diameter  of  top,  14%  inches   i 26.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


139 


2670. 


2672. 
2674. 


2676. 


2677. 
2678. 
2679. 
2680. 
2681. 
2082. 

2683. 


Nos.  2670-6. 


CENTRIFUGES,  INTERNATIONAL 

INTERNATIONAL  CENTRIFUGES  are  so  well  known  as  to  need  no  comment.  The  ones  listed 
below  are  those  which  have  proved  most  adapted  to  laboratory  needs  and  will  cover  practically 
every  requirement  of  the  scientific  worker.  They  are  carried  in  stock  for  prompt  shipment. 
Prices  upon  any  others  not  listed  will  be  furnished  upon  request,  and  deliveries  can  be  made 
within  a  reasonable  length  of  time. 

The  centrifuges  are  mounted  in  a  heavy  bell  shaped  casting  which  furnishes  at  the  same  time  a 
rigid  base,  a  protective  housing  and  a  strong  bearing  for  the  motor.  Ample  provision  is  made 
for  oiling.  The  lower  end  of  the  shaft  of  the  motor  runs  on  a  ball  step  immersed  in  oiL  A 
speed  control  rheostat  is  supplied  with  each  centrifuge. 

The  prices  of  the  centrifuges  whose  description  follows,  do  not  include  heads  or  equipment. 
Select  the  ones  adapted  to  your  needs  from  the  list  of  accessories.  We  carry  in  stock  parts 
for  which  there  is  the  greatest  demand.  Other  types  or  parts  will  be  obtained  upon  short 
notice. 

CENTRIFUGE,  International  No.  1,  Type  B,  for  110  volts  alternating  current.  With  rheostat 
for  speed  control,  but  without  heads  or  tubes. 

Specifications: — 


Height,  cover  closed,  23  inches. 

Height,  cover  open,  33  inches. 

Diameter,  17  inches. 

Shipping  weight,  about  270  pounds. 

Speed  with  four-tube  15  ce  head  and  tubes, 

3600  r.  p.  m. 

Relative  force  times  gravity,  2015. 
Average  spread,  28  cm. 


Speed  with  eight-tube  50  cc  head  and  tubes, 

3000  r.  p.  m. 
Relative  force,  1600. 
Average  spread,  32  cm. 
Speed  with   Board  of  Health   Head,  3000 

r.  p.  m. 

Relative  force,  900. 
Average  spread,  18  cm. 


Price  $117.60 


CENTRIFUGE,  International  No.   1,  Type  B, 

current    

CENTRIFUGE,  International  No.   1,  Type  B, 

speed  control  but  without  heads  or  tubes. 
Specifications : — 

Height,  cover  closed,  18  inches. 

Height,  cover  open,  28  inches. 

Diameter,  17  inches. 

Shipping  weight,  about  160  pounds. 

Speed  with  four-tube  15  cc  head  and  tubes, 
4000  r.  p.  m. 

Relative  force  times  gravity,  2491. 

Average  spread,  28  cm. 

Price  . 


same  as  No.  2670,  but  for  220  volts  alternating 

117.60 

for  110  volts  direct  current.    With  rheostat  for 


Speed  with  eight-tube  50  cc  head  and  tubes, 

3000  r.  p.  m. 

Relative  force  times  gravity,  1600. 
Average  spread,  32  cm. 
Speed  with  Board  of  Health  Head,  3000 

r.  p.  m. 

Relative  force,  900.     • 
Average  spread,  18  cm. 


102.00 

CENTRIFUGE,   International  No    1,  Type  B,    same    as    No.    2674,    but    for    220    volts    direct 

current    105.60 

Accessories  for  International  Centrifuge  No.  1,  Type  B. 

Two-Tube  15  cc  Head  and  attached  trunnion  rings   3.60 

Four-Tube  15  cc  Head  and  attached  trunnion  rings  8.40 

Eight-Tube  15  cc  Head  and  attached  trunnion  rings 14.40 

Two-Tube  50  cc  Head  only  without  trunnion  rings   4.20 

Four-Tube  50  cc  Head  only  without  trunnion  rings   8.40 

Four- Tube  Combination  Head,  with  two  attached  15  cc  trunnion  rings  only  and  places  for  two 

50  cc  trunnion  rings 8.40 

Eight-Tube  Combination  Head,  with  four  attached  15  cc  trunnion  rings  only  and  places  for  four 

50  cc  trunnion  rings ' 15.60 


140 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  S.  A. 


2684. 
2685. 
2686. 
2687. 
2688. 
2689. 
2696. 


No.  2696. 

Two-Place  Head  only  for  Goetz  tubes  or  separatory  funnels $4.20 

Eight-Tube  50  cc  Head  only 14-40 

Board  of  Health  Disk,  without  tubes 14.40 

Bronze  Basket,  5  inches  in  diameter,  perforated,  with  copper  drip  can 26.40 

Cast  Iron  Stand  for  mounting  No.  1  Centrifuge 13.20 

Two-Bottle  Shaker  Head  for  use  on  No.  1  Centrifuge 24.00 

CENTRIFUGE,  International  No.  2,  similar  in  construction  to  No.  2670,  but  larger,  affording 
greater  capacity  and  rendering  available  more  varied  equipment.  The  same  equipment  of  heads 
and  tubes  may  be  used  and  in  addition  100  cc  tubes  swung  in  the  eight-tube  head;  also  a 
sixteen-tube  head  carrying  50  cc  tubes  or  Babeock  test  bottles.  In  addition  a  two-place  or  a 
four-place  head  for  Squibb 's  separatory  funnels  of  about  150  cc  capacity  may  be  used.  Other 
combinations  will  be  found  in  the  list  of  accessories  which  follows.  Equipped  with  hand  brake 
for  bringing  quickly  to  rest,  and  device  for  lifting  brushes  permitting  a  very  gradual  decrease 
in  speed  in  coming  to  rest.  Complete  with  rheostat  for  speed  control  but  without  head  or 
tubes,  with  motor  for  220  volts  alternating  current. 
Specifications : — 


Height,  cover  closed,  28  inches. 

Height,  cover  open,  40  inches. 

Diameter,  24  inches. 

Shipping  weight,  about  450  pounds. 

Speed  with  16-tube  50  ee  head  and  tubes, 

2000  r.  p.  m. 
Eelative  force,  954. 
Average  spread,  43  cm. 
Speed  with  8-tube  100  cc  head  and  tubes, 

2200  r.  p.  m. 
Relative  force,  1077. 
Average  spread,  40  cm. 


Speed  with  8-tube  50  cc  head  and  tubes, 

3100  r.  p.  m. 
Relative  force,  1708. 
Average  spread,  32  cm. 
Speed  with  Board   of   Health  Head,  3000 

r.  p.  m. 

Relative  force,  900. 
Average  spread,  18  cm. 
Speed  with  4-tube  250  ce  head  and  tubes, 

2400  r.  p.  m. 
Relative  force,  1152. 
Average  spread,  36  cm. 


Price  186.00 

2698.     CENTRIFUGE,  International  No.  2,  same  as  No.  2696,  but  for  220  volts  alternating  current.   186.00 

2700.     CENTRIFUGE,  International  No.  2,  same  as  No.  2696,  but  for  110  volts  direct  current 186.00 

2702.     CENTRIFUGE,  International  No.  2,  same  as  No.  2700,  but  for  220  volts  direct  current 186.00 

Accessories  for  International  Centrifuge  No.  2,  in  Addition  to  those  Listed  under  Centrifuge  No.  1. 

2704.  Two-Place  Head  only  for  Goetz  tubes  or  separatory  funnels 7.20 

2705.  Four-Place  Head  only  for  Goetz  tubes  or  separatory  funnels 11.50 

2706.  Eight-Tube  Combination  Head  only  for  6  small  tubes  and  2  Goetz  tubes  or  funnels 18.00 

2708.  Sixteen-Tube  Head  only,  for  15,  50  or  100  ce  tubes,  or  Babcoek  test  bottles 22.80 

2709.  Bronze  Basket,  11  inches  in  diameter,  perforated,  with  copper  drip-can 42.00 

2710.  Metal  Shield  for  100  cc  tubes,  Cornell  style,  with  rubber  cushion 90 

2711.  Trunnion  Ring  for  100  cc  tubes 48 

2712.  Long  Metal  Cup  for  9  inch  Babeock  bottles  in  head  No.  2708  only,  with  rubber  cushion 90 

2713.  Special  Long  Metal  Cup  for  9  inch  Babeock  bottles  in  Heads  Nos.  2681,  2685,  and  2706,  with  rub- 

ber cushion   1.32 

2714.  Metal  Shield  for  100  ce  Oil  Tube  No.  2717,  with  rubber  cushion 1.50 

2715.  Trunnion  Ring  for  Metal  Tubes  Nos.  2712,  2713,  and  2714 48 

2716.  Glass  Tubes,  100  cc,  plain,  lipped each  .25 

per  dozen    2.30 

2717.  Glass  Oil  Tubes,  100  cc,  graduated each  3.00 

per  dozen  30.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A.  141 


No.  2770. 

2718.  Rubber  Cushions  for  100  cc  Shield,  Cornell  style each  $0.30 

per  dozen    2.88 

2719.  Rubber  Cushions  for  100  cc  Oil  Tubes  No.  27*17 each       .55 

2720.  Cast  Iron  Stand  for  mounting  No.  2  Centrifuge 14.40 

2721.  Four-Bottle  Shaker  Head  for  use  on  No.  2  Centrifuge   28.80 

Accessories  for  Both  No.  1  and  No.  2  International  ^Centrifuges. 

LlTL'S.  Metal  Shield  for  15  ec  glass  tubes,  Cornell  style,  with  rubber  eusfiion 65 

2729.  Reducing  Cap  for  use  with  15  ec  glass  tubes  in  50  cc  metal  shields 18 

2730.  Metal  Shield  for  50  ce  glass  tubes,  Cornell  style,  with  rubber  cushion 80 

2731.  Trunnion  Ring  for  15  cc  tubes ". 55 

2732.  Trunnion  Ring  for  50  ce  tubes 48 

2733.  Babcock  Test  Trunnion  Cup,  with  rubber  pad,  for  use  in  place  of  50  ce  tubes .72 

2735.  Square  Trunnion  Cup  for  Sputum  Bottle  No.  2757  for  use  in  place  of  50  ec  tubes 94 

2736.  Trunnion  Carrier  for  150  cc  Squibb  separatory  funnels,  for  use  with  Heads  Nos.  2704  and  2705 

2.40 

2737.  Trunnion  Carrier  for  Goetz  phosphorus  tubes  for  use  with  Heads  Nos.  2704  and  2705 2.20 

2738.  Glass  Tubes,  15  cc,  plain each  .20 

per  dozen    1.92 

2739.  Glass  Tubes,  15  cc,  graduated  in  ^J0  divisions each  .60 

per  dozen    5.76 

2740.  Glass  Tubes,  15  cc,  round  bottom,  plain each  .12 

per  dozen    1.20 

2741.  Glass  Tubes,  15  cc,  narrow  neck each  .25 

per  dozen    2.35 

2742.  Hopkins  Vaccine  Tubes,  10  cc,  for  use  in  Metal  Shield  No.  2728 each     1.45 

2743.  Babcock  Test  Tubes  for  human  milk,  for  use  in  Metal  Shield  No.  2728 each  .55 

per  dozen    5.50 

2744.  Glass  Tubes,  50  cc,  plain,  lipped each  .25 

per  dozen    2.20 

2745.  Glass  Tubes,  50  cc,  plain,  narrow  neck each  .20 

per  dozen    2.20 

2746.  Glass  Tubes,  50  cc,  graduated  in  *£  cc  divisions  to  10  ec;  in  1  ee  divisions  to  50  ce.each  .90 

per  dozen    9.00 

2747.  Hart  Casein  Tubes  for  use  in  Metal  Shields  No.  2730  each  .60 

per  dozen  5.76 

2748.  Squibb  Glass  Separatory  Funnel,  150  cc,  for  use  in  Trunnion  Carrier  No.  2736 2.85 

2749.  Goetz  Glass  Phosphorus  Tube,  with  stopper,  for  use  in  Trunnion  Carrier  No.  2737 2.30 

2~r>0.     Board* of  Health  Glass  Tubes,  2  cc per  hundred  5.70 

2751.  Rubber  Stoppers  for  Board  of  Health  Tubes per  hundred  2.20 

2752.  Board  of  Health  Tubes,  set  of  20,  with  40  stoppers » . , per  set  2.40 

2753.  Rubber  Cushions  for  15  cc  shields,  Cornell  style   per  dozen  1.08 

L'7.~>4.     Rubber  Cushions  for  50  cc  shields,  Cornell  style  per  dozen  2.20 

2755.  Rubber  Caps  for  Tubes  Nos.  2738,  2739  and  2740 per  dozen     1.08 

2756.  Molded  Soft  Rubber  Caps  for  Glass  Tubes  No.  2745   per  dozen     1.15 

2757.  Square  Sputum  Bottles,  with  corks per  dozen       .73 

per  gross     6.80 

2758.  Speed  Revolution  Counter 1.80 

2770.     CENTRIFUGAL  MACHINE,  Hand,  for  chemical  use,  consisting  of  Milk  Testing  Centrifuge  No. 

9204C,  fitted  with  a  heavily  tinned  perforated  copper  basket  7%  inches  in  diameter  and  3^4 
inches  deep,  with  %  inch  flange  at  the  top.  Can  be  used  for  a  variety  of  purposes,  such  as  dry- 
ing crystals,  etc.  Where  corrosive  materials  are  used,  the  inside  of  the  iron  case  should  be 
coated  with  some  resistant  material,  such  as  paraffine  or  acid-proof  varnish.  The  case  is  pro- 
vided with  an  outlet  at  the  bottom  for  draining 25.00 

CENTRIFUGES,  Babcock  or  Milk  Testing,  see  Milk  Testing  Apparatus. 

CENTRIFUGE,  International  Board  of  Health,  see  Milk  Testing  Apparatus. 

CENTRIFUGES,  Soil,  see  Soil  Analysis  Apparatus. 

CENTRIFUGES,  Moisture  Equivalent,  seo  Soil  Analysis  Apparatus. 


142 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2772. 


No.  2782. 


2772.  CENTRIFUGAL  MACHINES,  of  acid  proof  construction,  with  basket  and  drip-can  of  porcelain. 
Especially  adapted  for  determining  yield  of  sugar  in  refinery  laboratories,  and  for  drying 
crystals  in  the  experimental  manufacture  of  chemical  salts.  The  centrifuge  is  housed  in  a  cast 
iron  frame  with  enclosed  direct  connected  motor  with  special  bearings.  The  cast  iron  drain- 
ing chamber  has  an  outlet  at  the  bottom  and  the  base  is  cut  away  to  allow  a  collecting  jar  to  be 
placed  beneath  the  outlet.  Complete  with  rheostat  for  speed  control,  perforated  porcelain 
basket  6  inches  in  diameter,  porcelain  drip-can  and  interchangeable  four-tube  head  with  set  of 
10  cc  plain  glass  tubes.  Dimensions:  height  over  all  with  cover  closed,  22  inches;  with  cover 
open,  34%  inches;  diameter  of  cast  iron  chamber  outside,  11  inches;  maximum  speed  permis 
sible  with"  porcelain  basket,  2500  r.  p.  m.;  speed  with  four-tube  head,  3000  r.  p.  m.;  shipping 
weight,  160  pounds. 

No A  B  C  D 

A.  C.  D.  C. 

For  volts 110  220  110  220 

Each $128.70  128.70  128.70  128.70 

Note: — If  larger  centrifuges  are  desired  than  the  preceding,  information  will  be  furnished  and 
prices  quoted  upon  receipt  of  specifications  giving  purpose  for  which  used,  size  of  basket  or 
number  of  tubes  speed  desired,  character  of  driving  power,  etc. 

Accessories  for  Centrifugal  Machine  No.  2772. 

2774.  Perforated  Porcelain  Basket,  6  inches  in  diameter 23.10 

2775.  Porcelain  Draining  Chamber  for  use  with  No.  2774 19.80 

2776.  Perforated  Bronze  Basket,  8  inches  in  diameter 113.30 

2777.  Four-Tube  Head,  with  metal  shields  for  10  cc  tubes,  with  rubber  cushions 13.20 

2778.  Four-Tube  Combination  Head,  with  2  metal  shields  for  10  cc  tubes  and  2  trunnion  cups  for  Gooch 

crucibles 14.85 

2779.  Hard  Rubber  Collars  for  Gooch  crucibles • per  pair       2.75 

Note: — Gooch  Crucibles  must  be  sent  in  to  bo  fitted  to  No.  2779,  as  they  vary  in  size. 

2782.  CENTRIFUGAL  MACHINE,  Sharpies  Super-Centrifuge,  gear  driven,  for  hand  power  or  belt 
drive.  Designed  for  the  application  of  extreme  speed  and  centrifugal  force  to  laboratory  prob- 
lems. Operating  speed  of  25,000  revolutions  per  minute  produces  a  separating  force  over  15,000 
times  as  great  as  gravity.  In  addition  to  maximum  speed  and  separating  force  it  has  the  fur- 
ther advantage  of  handling  liquids  continuously. 

By  means  of  this  centrifuge  colloidal  particles  may  be  separated  from  liquids;  bacteria  and  im- 
purities may  be  removed  from  hot  agar  solutions;  calcium  soaps  from  wool  fat,  and  oil  soap  and 
fatty  acids  from  gelatine;  water  from  fusel  oil;  suspended  matter  from  lacquers,  acids,  glue, 
etc.;  sulphuric  acid  from  oil;  pigments  from  paints  and  varnishes,  and  many  other  determina- 
tions and  separations  made  which  otherwise  can  be  effected  not  at  all  or  with  great  difficulty. 
Especially  valuable  in  the  chemical  laboratory  for  slow  filtering  precipitates  such  as  ferric 
hydrate,  ammonium  phosphomolybdate,  arsenic  sulphide,  etc.,  in  routine  analysis. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  8.  A. 


143 


2784. 


2785. 


2786. 
2787. 
2788. 
2790. 


No.  2784. 


No.  2785. 


No.  2790. 


CENTRIFUGAL  MACHINE,  Sharpies  Super-Centrifuge,  Continued. 

The  machine  consists  essentially  of  an  iron  frame  cast  in  one  piece.  Within  this  is  suspended  a 
seamless  tubular  tin  lined  steel  bowl,  by  means  of  a  flexible  spindle,  with  a  cone  at  its  upper 
end,  running  on  ball  bearings.  By  means  of  the  cone  bearings  wear  is  automatically  taken  up. 
At  the  lower  end  of  the  bowl  is  a  guide  or  drag  which  keeps  the  bowl  centered  and  absorbs 
vibrations.  Parts  are  easily  removed  for  cleaning  and  can  be  readily  and  economically  replaced 
when  worn. 

The  liquid  comes  in  contact  only  with  tinned  surfaces  except  in  passing  through  the  feed  nozzle, 
which  is  of  nickel;  consequently  weak  acids  or  alkalies  may  be  handled  continuously  or  stronger 
reagents  for  brief  periods.  If  desired  the  machine  parts  may  be  obtained  plated  with  gold, 
silver,  or  platinum,  at  an  additional  charge. 

Height  of  machine,  24  inches.  Size  of  base,  10^x8  inches. 

Weight,  50  pounds.  Maximum   speed   of  gear  driven  machine, 

Diameter  of  inner  bowl,  2  inches.  25,000  r.  p.  m. 

Capacity  of  bowl,  250  cc.  Power  required  to  operate,  %  h.  "p. 

Complete  with  tin  lined  bowl,  geared  crank  and  pulley,  2x10  inches,  for  hand  or  belt  drive  $125.00 

CENTRIFUGAL  MACHINE,  Sharpies,  same  as  No.  2782,  but  with  turbine  wheel  attached  to 
shaft  for  driving  with  steam  or  compressed  air  at  20  pounds  pressure.  With  a  pressure  of  25 
pounds,  a  maximum  speed  of  40,000  r.  p.  m.  is  attained,  producing  a  centrifugal  force  of  over 
40,000  times  gravity.  Air  consumption,  40  cubic  feet  per  minute;  steam  consumption,  60 
pounds  of  water  per  hour.  Complete  with  speed  indicator 125.00 

Extra  Inner  Bowl,  of  steel  nickel-plated,  for  use  in  clarifying  or  filtering  liquids  in  quantities 
not  exceeding  50  cc.  It  is  not  continuous  in  action.  Consists  of  two  parts,  threaded  to  screw 
together.  Liquid  is  placed  in  lower  part,  the  top  screwed  on,  the  whole  bowl  is  then  placed 
within  the  regular  super-centrifuge  bowl.  When  the  bowl  revolves,  the  liquid  is  instantly 
drawn  into  the  upper  chamber,  where  the  solids  are  packed  against  the  outer-wall.  The  liquid 
again  collects  in  the  lower  part  when  the  machine  is  stopped,  leaving  a  perfectly  clear  filtrate. 
Quantitative  results  may  be  secured  with  proper  care.  Especially  valuable  in  handling  serums 
and  bouillons  in  bacteriological  work 8.00 

Extra  Inner  Bowl,  same  as  No.  2785,  but  silver-plated 12.00 

Extra  Inner  Bowl,  same  as  No.  2785,  but  gold-plated 15.00 

Extra  Inner  Bowl,  same  as  No.  2785,  but  platinum-plated Price  quoted  upon  application. 

CENTRIFUGE  TUBE  BALANCE,  for  use  in  selecting  glass  centrifugf  tubes  whose  weights  are 
approximately  equal,  in  order  to  prevent  centrifuge  bearings  from  wearing  unevenly.  It  will 
take  either  15  ce  or  50  cc  standard  tubes.  Finished  in  black  enamel  and  nickel-plate.  Complete 
with  two  aluminum  shields  and  two  15  cc  plain  glass  tubes,  mounted  on  enameled  iron  base  with 
robber  feet 18.00 


144 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


AX\BLE  OFTHE  CHEMICAL  EEMENTSWmi  THEIR  ATOMIC  WIGHTS 

COMPILED  BY  DR.  F  W.CLARKE 

AND  REPORTED  TO  THE  AMERICAN  CHEMICAL  SOCIETY 

AJ         771 

Helium                       He.      4.0 

Hndiun 

Rh.     IOZ.9 

AnUmorwstibtumi 
Arton 

5b.     120.Z 
A.      39.9 

Hydrogen                    H.      1.008 

Ruhidium 

Rb.    B5.4S 

Em    I             —  Jn.     114.8 

Rulhpnium 

Ru.     1017 

Anemc. 

As.      75.0 

lidine                         L     1239? 

Sjmarium  
Scindium 

_Sl.     1504 
St.      44.1 

Barium 

Hi  '137  37 

Iridium                     Ir      1931 

Bismuth  

Bi      2D80 

kraiLinmiM.  —  ft.    55.85 

Kryplnn                             Kr.        818 

StlMium                         S«       79  7 

EM 

B         11.0 

Silirnn 

Si.      28.3 

Bromine 

h    7932 

lunthannm                         Ir      139.0 

Silver.  'Argintum).  
SodiUm.(Hatrliim)  
Slrenliiin 

__At    10788 
III    23.00 
Sr.    87.62 

Cadmium. 

Cd.    IK4D 

Itad.ipiumbiiiw  Pb.  287.10 
Lithium                      ti.      700 

r«f»inm 

Cs.    13281 

Calcium 

Ca.    40.09 

luliriiim                         III      174  D 

Sulphur 

S.      32.07 

Carbon 

C       1200 

Kionesmn                   H(    2432 

Tanblum 

la.     181.0 

Ceriun 

Ct   14025 

HanjanesB                    NIL    5493 

Tellurium 

Te.     127.5 

Chlorine 

0     3546 

Mercury  'Hyuroreyrumi  Hi.    200.0 
Molybdenum  Na     35.0 
Neodymura.                 Nd.    K4.3 

Tb.     159.2 

Cr      52.1 

Thallium 

TI.     2040 

SSt 

Co     5837 

Thtmnm 

Th.  E32.42 

Columbiunuiiom 

nil  Cb.      93.5 
Cu.    8357 

Kton                           IB.      20.8 

Thulium 

Tm.    168.5 

Nickel                         IL     58.68 

Tin.iSlinnuml  
Titanium 

Sn.     113.0 
Ti.      48.1 

Dy     162.5 

Kitroien                     It      14.01 

Frhium 

Er.     167.4 

Osmium                         OS.     190.9 

Tun8sltn.n«iiiirnimiiiini. 

Uranium 

W.     184.0 
_J.     238.5 

EuropiUB 

Ell     152.0 

Oiy»M                            D        IE.OO 

Fluorine 

F        19.0 

Mladim  Pi     106.7 
Platinum.   '                 PL     195.0 

Vanadium. 

V.       51.2 

Gadminium  
Gallium 

Ed.    157.3 

Ca      69.3 

X(?nnn, 

IB.    128.0 

Ytterbium.  »«iytitii».!_rb.    I7Z.O 
YHrium                           T         890 

Germanium  
Glucinum.  Btniim 

Cold.  Aimiro  
COffK 

8e.     725 
M        El        91 

Potasiiom.iuttiM)  R.      3ilO 
PraseoeVmium               Pr.     148.6 

7inc 

Zn.    65.37 

___Au.     I37.Z 
itscm/nncto 

Rjjium                        «i    2214 

Zirconium. 

Zr      90.6 

durxicra  w  na.                    usonutxrtPHimrt/s 

No.  2804. 

2800.     CHAMOIS  SKIN,  for  cleaning  instruments,  etc. 

No 

Size,  inches 

Each  . 


A 

6x8 

$0.15 


B 

9x11 
.30 


C 

10x13 
.45 


D 

14x18 
1.10 


1478.     CHARCOAL  STICKS,  natural  willow  wood,  4xlx%  inches Per  dozen         .50 

2804.  CHART,  Atomic  Weight.  Compiled  by  Dr.  F.  W.  Clarke  and  reported  to  the  American  Chemical 
Society.  Corected  up  to  1918.  Size  42x62  inches.  Mounted  on  linen  back  on  common 
rollers 2.50 


PERIODIC  CLASSIFICATION  OF  THE  ELEMENTS 

ACCORDIXO  TO  MENDKLEJ  EFF 

ON  BASIS   out 

REVISED  AND  CORRECTED  TO  191ft  BY  DR.  F.W.CLARKE. 

Series 

Group  0 

Group   1 

Group  Z 

Group  3 

Group  4 

Group  5 

Group  G 

Group  7 

Group  B 

1 

H-l 

Z 

Ht-4 

U-7 

GI-9.1 

Bll 

C-IZ 

N-14 

0-16 

F-19 

3 

Nc-20 

Ha-  23 

MfZ44 

AI-Z7I 

Si-28.4 

P-31 

S-32 

CI-35« 

Fc-553 

4 

A-393 

K-39.1 

Ca.40l 

Sc-44J 

Ti-4ai 

V-SL2 

Cr-5ZI 

Mn-bS 

Hi-58.7 

C«-59. 

5 

Cu  G3B 

Zn-654 

Ea-70 

Ge-7U 

As-75 

S«-79.2 

Br-7995 

Ru-101.7 

6 

Kr=8l8 

Rb-855 

Sr-87.6 

Y-89. 

Zr-90B 

Cb-94. 

Mo-96 

"• 

Rh-103 

Pd-ioas 

7 

Aj-10793 

Cd  112.4 

In  115 

Sn-119 

Sb-IZ0.2 

Te-IZTG 

I-I2B37 

8 

XHZ8 

Cs=l32.9 

Ba-1374 

La^l389 

Ce-l4DZ5 







1 

Os-191 

10 











Ta-131. 

W-184 



lr-193 

PH94.8 

II 



AiiH972 

H8=cuQ 

Tl=  234.1 

Pb-2QG3 

Bi'208 





IZ 





Ra-225 



Th-Z3Z5 

. 

U  ZJ8.5 





amau.sannricca    ""'                                                               LABOKa^r^iKfri/s 

No.   2806. 

2800.     CHART,  Mendelejeff  Periodic  System.     The  periodic  arrangement  of  the  elements  according  to 
Mendelejeff,  on  the  basis  of  O=16,     Eevised  and  corrected  up  to   1918  by  Dr.  F.  W.   Clarke. 
American  nomenclature.     Size  42x62  inches.     Mounted  on  linen  back  on  common  rollers.      2.50 
CHARTS,  for  Botany,  Zoology  and  Physiography,  C3nd  for  special  bulletin. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  S.  A. 


145 


f 


l.\Ti:UNATIO\  \l.   MIITKK 


STKM 





No.  2807. 

2807.  CHART,  Metric,  showing  in  full  size  and  in  perspective  where  necessary  the  nnits  of  the  interna- 

tional metric  system,  with  units  of  the  English  system  for  comparison.  Tables  showing  the  de- 
rivation of  the  names  of  the  metric  units  and  their  abbreviations,  together  with  tables  of  metric 
and  English  equivalents  are  included.  The  chart  is  25  by  41  inches,  mounted  on  cloth  back, 
with  common  rollers i $2.00 

2808.  CHART,  Spectrum,  showing  6  spectrum  and  12  intermediate  colors  with  two  tints  and  two  shades 

of  each.     A  chart  of  approximately  complementary  colors,  one  showing  the  relative  value  of 
spectrum  colors  as  obtained  by  a  prism,  and  a  set  of  grays,  showing  eight  tones  are  included. 

2.M 

2812.  CHART,  Spectrum,  mounted  on  linen  back  with  common  rollers  and  containing  the  following 
spectra  (size  of  each  spectrum  5.5  cm  wide,  52  cm  long) :  K,  Rb,  Cs,  Tl,  Na,  Li,  Ca,  Sr,  Ba. 
5.50 

2814.  CHART,  Spectrum,  same  as  No.  2812,  with  the  following  spectra:  In,  C,  Bo,  Mn,  Pb,  Cu,  Co, 
Ni,  Fe 5.50 


No.  2824. 


No.  2818.     No.  2820. 


No.  2830 


No.  2828. 


2816. 
2818. 
2820. 

2822. 
2824. 


CHEESE-CLOTH   Per  yard 

CHIMNEYS,  Students'  Lamp Per  dozen 

CHIMNEYS,  Argand,  straight,  2x7  inches Per  dozen 

CLAY  PIPES,  see  Pipes,  Clay. 
CLOTH,  Emery,  see  Emery  Cloth. 

CHISEL,  Cold,  length  6  inches,  width  of  blade  %-inch 

CHISELS,  Gouge,  cast  steel,  with  wood  handle. 


"Width  of  blade,  inches 
Total  length,  inches 
Each 


2826.    CHISELS,  Plain,  cast  steel,  with  wood  handle. 

No 

Width  of  blade,  inches 

Total  length,  inches 

Each  . 


13 
90 


13 
.80 


.12 

1.80 
1.20 

.18 

B 
1 

14 
1.10 

B 

1 

14 
1.10 


2828. 
2830. 


CHLORINE   ABSORPTION  APPARATUS,  Bnnsen-Fresenius,  with  flask  ground  on  ......     1.40 

CHLORINE  TUBE,  2x100  cm,  for  showing  decomposition  of  water  by  chlorine  ............  80 


146 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2864. 


No.  2862. 


CLAMPS,  ALL  KINDS 


2838.    CLAMPS,  Beaker,  Cliaddock's. 

No A  B 

For  beakers,  ce 75  to  250         250  to  550 

Each $0.20  .20 

2840.    CLAMP,  Burette,  of  stamped  steel  with  rounded  jaws;  has  check  nut  to  adjust  to  any  position, 

and  clamp  holder.     An  excellent  clamp  for  general  use $0.40 

2842.    CLAMP,  Burette,  same  as  No.  2840,  but  with  jaws  rubber  covered 45 

2844.    CLAMP,  Burette,  same  as  No.  2840,  but  made  entirely  of  brass 80 

2846.    CLAMP,  Burette,  same  as  No.  2844,  but  with  jaws  rubber  covered 85 

2848.    CLAMP,  Burette,  of  japanned  iron,  with  coiled  spring  enabling  burette  to  be  adjusted  easily  and 

quickly.     With  rubber  covered  jaws .60 

2850.    CLAMP,  Burette,  or  tube,  of  brass  nickel-plated,  for  screwing  into  wall  or  shelf.     Open  in  front 

leaving  graduations  uncovered  for  reading 40 

2852.    CLAMP,  Burette,  Bunsen,  of  stamped  steel  with  rounded   jaws,  for  use  with   clamp   holder  No. 

2914;  for  tubes,  burettes,  etc.     Width  of  opening,  2  inches;  total  length,  9  inches;  diameter  of 

rod,  %  inches i 30 

2854.    CLAMPS,  Burette,  Bunsen,  same  as  No.  2852,  but  with  rubber  covered  jaws .35 

2856.    CLAMP,  Burette,  double,  same  as  No.  2848,  for  two  burettes 70 

2858.    CLAMP,  Burette,  double,  of  brass,  jaws  cork  lined   3.00 

2860.    CLAMP,  Burette,  Hofmann's,  double 36 

2862.    CLAMP,  Burette,  double,  designed  by  Prof.  Lincoln  of  the  University  of  Illinois.      Burettes  are 

held  perpendicular  and  are  easily  removed.    A  very  convenient  and  rigid  clamp,  nicely  made. 

1.10 

2864.  CLAMP,  Condenser,  new  form,  with  V  shaped  jaws  of  stamped  steel,  enabling  very  small  tubes 

to  be  clamped.     For  clamping  thermometers,   burettes,  condensers,   etc.     For  tubes  up   to   2% 
inches;  total  length,  11  inches;  diameter  of  rod,  %  inch .50 

2865.  CLAMP,  Condenser,  same  as  No.  2864,  but  with  rod  12  inches  long.  Total  length,  17  inches.         .60 
F151.  CLAMP,  Condenser,  same  as  No.  2864,  but  with  nickel-plated  rod  12  inches  long 70 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


147 


No.  2872. 


No.  2888. 


2868. 
2870. 

2872. 
2874. 
2876. 

2878. 
2880. 

2882. 


2884. 

2886. 

2888. 


CLAMP,  Condenser,  same  as  No.  2864,  with  check  nut  to  adjust  to  any  position,  and  with  clamp 

holder  attached   $°-90 

CLAMP,  Dish,  Stoddard's,  of  brass,  white-plated,  for  holding  evaporating  and  other  dishes  up  to 

4%  inches  in  diameter -16 

CLAMP,  Flask,  for  flasks  and  large  tubes,  of  wood,  with  wire  spring.  Length,  10^  inches.      .60 

CLAMP,  Test  Tube,  of  wood,  improved  form  with  brass  spring 12 

CLAMP,  Test  Tube,  of  spring  wire,  nickel-plated,  with  improved  finger  rests.     Length,  6^  inches 

16 

CLAMP,  Test  Tube,  Chaddock's,  of  japanned  wire,  shaped  as  shown  in  illustration 20 

CLAMP,  Test  Tube,  Stoddard's,  of  spring  wire.  Length,  4%  inches.   (See  No.  2918  Clamp  Holder.) 

10 

CLAMPS,  Tubing,  Cut-off,  of  brass,  nickel-plated. 

No A  B 

For  tubing  up  to.  inches ^6  %6 

Each 

Per  dozen -55  .90 

CLAMPS,  Tubing,  Mohr's  Pinchcock,  of  brass  spring  wire,  nickel-plated. 

No A  B  C 

Total  length,  inches 2%  3  3% 

For  tubing  up  to,  inches r'i,;  %  % 

Each 10  .12  .16 

CLAMP,  Tubing,  Mohr's  Pinchcock,  of  rectangular  wire,  giving  a  flat  bearing  surface  on  the  tub- 
ing 3  mm  wide,  insuring  close  contact  and  safe  guarding  the  tubing.  Made  of  stiff  spring  brass 

white-plated,  with  flat  finger  grips.     Length,  2%  inches;  for  tubing  up  to  %  inch 20 

CLAMPS,  Tubing,  Spring  Pinchcock,  Day's,  Patented.  Can  be  placed  on  or  removed  from  rubber 
tubing  without  disconnecting  apparatus.  The  most  serviceable  pinchcock  made.  Constructed 
of  strong  brass  spring  wire,  white-plated. 

No A 

Length,  inches 2%  2% 

For  tubing  up  to,  inches 91 6  % 

Each  .  08  .09 


148 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  2890.  No.  2890  (open). 


No.  2902. 


No.  2906. 


2890.    CLAMPS,  Tubing,  Screw  Compressor,  new  form,  of  brass  nickel-plated;   a  combination  of  Hof- 
mann's  and  the  old  form;  can  be  placed  upon  rubber  tubing  without  disconnecting  apparatus. 

No A  B 

For  tubing  up  to,  inches %e  % 

Each $0.20  .25 

2892.    CLAMP,  same  as  No.  2890,  but  extra  heavy,  for  pressure  tubing  up  to   %  inch  inside  diameter. 

35 

2894.     CLAMP,  Tubing,  Bunsen's  Screw  Compressor,  of  brass,  nickel-plated,  for  heavy  rubber  tubing. 

Size,  %  by  1%  inches 40 

2896.    CLAMPS,  Tubing,  Hofmann's  improved  form,  nickel-plated  -with  open  jaw. 

No A  B 

For  tubing  up  to,  inches ]/2  % 

Each 22  .28 

2898.    CLAMPS,  Universal,  with  swivel  jaws  adapting  themselves  to  irregular  shapes;  with  check  nut 
enabling  object  to  be  held  at  any  angle.     For  use  with  Clamp  Holder  No.  2914. 

No A  B 

For  tubes  up  to,  inches 3 

Total  length,  inches 8  10 

Each 65  .85 

2900.     CLAMPS,  Universal,  same  as  No.  2808,  with  iaws  rubber  covered. 

No A  B 

Each 70  .90 

2902.     CLAMP,  Watch  Glass,  of  brass,  nickel-plated,  for  watch  glasses  up  to  2%  inches  in  diameter       .12 
2904.     CLAMP,  Watch  Glass,  of  brass  spring  wire,  for  watch  glasses  up  to  3  inches  in  diameter.  .  .        .10 
2906.     CLAMP,  with  brass  hook  for  supporting  thermometers  and  other  apparatus;  with  screw  for  at- 
taching to  support  rods 75 

2914.    CLAMP  HOLDER,  of  iron  with  brass  screws,  for  fastening  clamps  to  support  rods  up  to  %0  inch 

in  diameter .35 

2916.    CLAMP  HOLDER,  same  as  No.  2914,  with  swivel,  for  attaching  clamps  at  any  angle 50 

2918.  CLAMP  HOLDER,  Stoddard's,  an  ingenious  device  for  rigidly  holding  Stoddard  Wire  Test  Tuba 

Holder  No.  2880  in  any  position.  Provides  for  vertical  and  horizontal  adjustment  to  any  angle, 
uid  will  adapt  itself  to  a  great  many  uses  in  the  laboratory.  Clamp  holder  with  right  angle 
clamp,  but  without  Test  Tube  Holde'r  No.  2880 • 44 

2919.  CLAMP  HOLDER  only  of  No.  2918 16 

2920.  RIGHT  ANGLE  CLAMP  only  of  No.  2918.     Has  one  %2-inch  hole  and  one  %-ineh  hole. ..         .28 
2922.    BASE  AND  ROD  for  use  with  No.  2918  as  shown  in  illustration.     Base  is  heavy,  and  stable  even 

with  excessive  load;  rod  is  15x%2  inches -60 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  8.  A. 


149 


No.  2940.  No.  F157.  No.  F213.  No.  F211. 


No.  F153  (in  use). 


CLAMPS,  GENERAL  LABORATORY 

The  clamps  listed  in  this  section  differ  from  the  usual  chemical  laboratory  clamps  in  that  they  are 
carefully  machined  to  secure  perfect  alignment  of  apparatus  with  which  they  are  used.     All  V's  are 
accurately  milled,  holes  are  carefully  reamed  and  faces  are  smoothly  planed.     They  should  be  selected 
whenever  it  is  essential  to  have  apparatus  assembled  with  an  accurate  arrangement  of  parts. 
2930.    CLAMPS,  Adjustable,  steel.     These  clamps  are  so  constructed  that  they  can  be  quickly  adjusted 
and  will  lock  themselves  the  moment  the  pressure  is  applied  to  the  screw.     The  bar  is  3%  inches 
from  the  center  of  screw.     A  very  desirable  clamp  for  light  or  medium  work. 

No B  C 

Maximum  opening,  inches 6  10  18 

Each $1.10          1.30  L80 

F211.  COLLARS,  with  set  screw,  allowing  a  clamped  rod  to  rotate  freely,  and  at  the  same  time  prevent- 
ing motion  along  the  axis.  The  two  smaller  sizes  are  of  brass,  nickel-plated;  the  others  of 

iron,  neatly  japanned.     No A  B  C 

For  rods' of  diameter,  mm 10  13  19  30 

Each $0.40  .50  .60  .80 

F213.  HOOK  COLLARS,  with  set  screw,  of  substantial  construction.  The  many  uses  to  which  such  a 
piece  may  be  put  will  readily  be  seen.  The  two  smaller  sizes  are  of  brass,  nickel-plated  and 
the  other  of  cast  iron,  neatlv  japanned. 

No ." A  B  C 

For  rods  of  diameter,  mm 10  13  19 

Each 60  .70  .80 

F153.  CLAMPS,  Extension,  for  holding  two  rods  parallel  to  each  other.  (The  illustration  shows  the 
clamp  in  use  with  two  rods  and  an  iron  table  top.) 

No A  B  C 

For  rods  of  diameter,  mm 10  13  19 

Each .         .50  .70  1.00 

2940.    CLAMPS,  Hand  Screw,  wood,  with  saw  cut  threads  on  screws. 

No A  B  C  D  E 

Length  of  jaws,  inches 7  10  12 

Opening,  inches 2  3  4V>  5% 

Each 55  .65  .80  1.00  1.25 

F155.     CLAMP,  Extension,  for  holding  two  rods  parallel  to  each  other.     By  using  this  clamp  it  is  pos- 
sible to  fasten  two  rods  parallel  to  each  other  without  slipping  the  clamp  over  the  end  of  the 
rods,  as  was  necessary  in  the  old  form.    For  use  with  rods  of  from  10  to  19  mm  diameter.     $0.70 
F157.     CLAMPS,  Extension,  for  holding  two  rods  in  line.     The  lower  end  is  reamed  to  fit  the  top  of  the 
lower  rod  and  is  provided  with  a  set  screw;  upper  end  is  tapped  to  receive  the  upper  rod. 

No A  B  C  D 

For  lower  rod  of  diameter,  mm 13  19  13  19 

For  upper  rod  of  diameter,  mm 13  19  10  13 

Size  of  thread  of  upper  rod %-16  V-12  1,4 -20  %-16 

Each .55  .65  .55  .65 


150 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  F163 


No.  F171.       No.  F165.      No.  F173A. 


No.  2974. 


F163.  CLAMP,  Meter  Stick.  A  convenient  device  for  holding  the  ordinary  meter  stick  in  position  on 
a  rod,  with  V  opening  for  clamping  it  to  any  rod  from  10  to  19  mm  in  diameter.  The  meter 
stick  is  held  firmly  in  place  parallel  to  the  rod  by  a  thumb  screw $0.55 

F165.  CLAMPS,  Parallel-Jawed,  of  brass,  nickel-plated,  for  holding  square  objects,  mirrors,  scales, 
screens,  etc.  Maximum  opening  of  jaw,  4  cm.  Bod  10  mm  in  diameter. 

No A  B 

Eod,  length,  cm 10  20 

Each 1.70  1.80 

F171.  CLAMP,  Bight  Angle,  of  brass,  nickel-plated.  To  hold  two  10  mm  rods  accurately  at  right  angles 
to  each  other 50 

F173.  CLAMP,  Bight  Angle,  of  iron,  neatly  japanned.  Size  B  and  C  have  zero  indicator  for  optical 
bench  accessories. 

No A  B  C  D 

V  opening  for  rods  of  diameter,  mm 13  19  19  30 

Hole  for  rods  of  diameter,  mm 10  13  6  19 

Each 50  .60  .60  1.00 

F175.    CLAMP,  Bight  Angle,  of  iron,  neatly  japanned,  with  two  V  openings  at  right  angles. 

No A  B 

V  openings  for  rods  of  diameter,  mm 13  19 

Each 50  .60 

Note: — For  less  expensive  right  angle  clamps,  see  No.  2914  Clamp  Holder. 
F177.     CLAMP,  Bight  Angle.     One  19  mm  V  opening.     Tapped  ^4 -20  to  receive  10  mm  rod 60 

F179.  CLAMP,  Right  Angle,  for  lens  holders,  telescope  supports,  pulleys,  etc.,  with  zero  indicator  for 
photometer  and  optical  bench  accessories.  Carefully  made  so  that  the  rod  will  be  held  perpen- 
dicular to  the  V.  The  V  opening  is  for  rods  19  mm  in  diameter. 

No A  B 

Hole  for  rods  of  diameter,  mm 10  13 

Each 60  .90 

F180.  CLAMP,  Bight  Angle,  same  as  No.  F179A,  with  addition  of  a  spring  so  that  it  can  be  moved 
along  the  rod  without  loosening  the  set  screw.  Convenient  for  carrying  photometer  box.  1.50 

2974.    CLAMPS,  Standard,  made  of  malleable  iron,  and  provided  with  ball  and  socket  swivel  cap  on  screw. 

No A  B  C 

Opening,  inches 3  4  6 

Each 70  .85  1.30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  6.  A. 


151 


No.  F187. 


No.  F201. 


F183.  CLAMP,  Support,  Bridge  Form..  For  use  with  double  rod  optical  bench  or  photometer,  made  up 
of  Xo.  F303  End  Supports  and  a  pair  of  19  mm  square  rods.  Is  easily  clamped  to  the  rod  by  a 
slight  movement  of  the  handle  seen  in  the  illustration.  Provided  with  an  index  line  or  zero 
indicator  in  the  same  plane  with  the  vertical  hole,  which  is  10  mm  in  diameter $3.00 

F185.  CLAMP,  Support,  Screw  Adjustment  For  same  uses  as  No.  F179  Right  Angle  Clamp,  but  de- 
signed to  give  a  very  fine  adjustment  in  a  plane  perpendicular  to  the  V.  Provided  with  zero 
indicator.  Range  of  adjusting  screw,  over  25  mm,  V  opening  19  mm,  hole  10  mm 6.00 

F187.  CLAMP,  Swivel.  Very  useful  for  holding  pulleys,  mirrors  and  lens  supports  where  different 
angular  directions  are  desired.  Two  19  mm  V  openings,  which  can  be  clamped  at  any  angle 

to  each  other  in  parallel  planes 1.20 

For  less  expensive  CLAMP,  with  swivel,  see  No.  2916  Clamp  Holder. 

F189.     CLAMPS,  T,  for  holding  two  round  rods  at  right  angles  to  each  other  in  the  same  plane. 

No A  B 

For  rods  of  diameter,  mm 13  19 

Each 65  1.10 

F191.  CLAMP,  Table,  of  iron,  for  a  table  top  8  cm  thick  or  less,  with  accurately  milled  Vs  at  right 
angles  to  each  other.  To  be  attached  to  the  edge  of  the  table  for  holding  10  to  19  mm  round 
or  square  rods,  either  horizontally  or  vertically.  The  broad  flange  is  carefully  milled  and  in- 
sures stability.  The  T-screw  is  swiveled  for  protection  of  the  table 1.60 

F192.     CLAMP,  Table,  same  as  No.  F191.      For  a  table  11  cm  thick  or  less 1.80 

F195.  CLAMP,  Table,  wooden  jaws,  for  a  table  top  8.5  cm  thick  or  less.  Designed  for  use  where  there 
is  danger  of  injury  to  the  table  top.  Upper  jaw,  8x18  cm;  lower  jaw,  8x10  em.  The  large 
surface  of  jaws  gives  increased  stability.  The  lower  jaw  is  swiveled.  Tapped  %-12  to  receive 
19  mm  rod 2.25 

F197.  CLAMP,  Table.  Similar  to  No.  F195,  but  without  the  wooden  jaws.  The  flange  at  the  top  is  broad 
so  that  injury  to  the  table  top  is  prevented.  Tapped  %-16  to  receive  13  mm  rod 75 

F245.  CLAMP,  Telescope,  for  telescopes,  lenses  and  cylinders  of  any  form  and  size  as  well  as  irregular 
objects  up  to  8  cm  in  diameter.  Mounted  on  nickel-plated  rod  20  cm  long  by  13  mm  in 
diameter 3.00 

F201.  CLAMP,  Telescope.  Made  of  brass,  for  holding  telescopes  from  2  to  5  cm  in  diameter.  The  teles- 
cope is  held  in  place  by  a  leather  strap  and  is  therefore  not  liable  to  injury  as  is  the  case  when 
metal  clamps  are  used.  A  No.  F133  Support  Rod,  20  cm  in  length,  is  included,  which  may  be 
placed  either  as  shown  in  the  illustration  or  in  a  position  at  right  angles  to  this.  The  clamp  is 
also  tapped  to  receive  a  No.  F131  Support  Rod  for  carrying  a  scale 3.50 


152 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


F203. 


No.  3000. 


No.  3002. 


No.  3004. 


CLAMP,  Stone's  Tension,  modified  form,  for  use  in  experiments  where  it  is  desired  to  maintain 
a  strain  on  a  wire  or  cord  and  enable  an  individual  operator  to  readily  adjust  the  tension  with- 
out the  co-operation  of  a  second  person. 

This  clamp  is  substantially  made  of  cast  iron  and  neatly  finished.  Will  fit  any  table  or  board 
7  centimeters  thick  or  less.  Wires,  cords,  etc.,  are  securely  clamped  by  an  eccentric  lever,  as 
shown  in  the  illustration $0.50 

2990.      CLIPS,  Spring,  of  wood,  for  holding  tubes,  etc per  dozen       .20 

3000.  CLOCK,  Interval.  Alarm  may  be  set  to  ring  at  the  expiration  of  any  interval  from  a  quarter  of 
a  minute  up  to  two  hours.  Does  not  start  until  the  alarm  is  wound,  and  stops  with  the  ring- 
ing of  the  alarm.  Valuable  in  all  experiments  in  which  action  for  a  definite  length  of  time  is 
necessary,  as  the  operator  is  free  to  go  on  with  other  duties  without  fear  of  overrunning  the 
time.  Many  uses  of  this  timer  will  readily  present  themselves.  Well  made  and  reliable.  $4.00 

For  TIME  SWITCH  for  use  with  No.  3000,  see  No.  13810. 

3002.  CLOCK,  Laboratory.  This  is  the  best  clock  we  can  furnish,  adapted  to  the  needs  of  the  average 
laboratory.  It  is  an  eight-day  Waltham  movement,  weight-driven  clock,  and  we  guarantee  it 
to  be  a  reliable  timekeeper. 

The  dial  is  12  inches  in  diameter  with  seconds  divisions.  It  is  provided  with  hour  and  minute 
hands  and  a  full  sweep  seconds  hand  for  timing  laboratory  experiments. 

The  pendulum  is  full  seconds  length,  and  provided  with  an  adjustable  platinum  contact  and  a 
mercury  well  of  improved  construction,  adjustable  from  the  outside  of  the  case,  is  mounted  in 
correct  position. 

The  clock  is  completely  enclosed  in  a  polished  oak  case,  with  glass  front  and  glass  covered  open- 
ing in  the  sides  opposite  the  works,  and  binding  posts  on  the  outside  for  attaching  battery 
and  sounder  150.00 

3004.  CLOCK,  Laboratory.  An  eight-day  clock  with  good  movement,  driven  by  two  weights.  The 
dial  is  12  inches  in  diameter  and  the  pendulum  beats  seconds.  The  clock  is  provided  with  mer- 
cury contact  adjustable  from  the  outside  of  the  case,  and  with  binding  posts  for  electrical  con- 
nections. Complete  in  polished  oak  case  with  glass  door 55.00 


3006. 


CLOTH,  Tracing,  thin,  good  quality. 

Width,  inches 

Per  yard  


30 
.90 


36 
1.00 


38 
1.25 


42 
1.75 


3008.      CLOTH,  Cotton,  Turkey  Bed,  used  to  show  bleaching  effect  of  chlorine per  yard        .25 


CENTRAL,  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


153 


f 


No.  3010. 


No.  3014.  No.  3016.  No.  3018.  No.  3020.      No.  3022.  No.  3024.         No.  3026. 


COLOR  COMPARISON  TUBES 

3010.     COLOR  COMPARING  CYLINDERS,  Helmet,  for  the  estimation  of  iron  in  -water,  consisting  of  *wo 
graduated  tubes  of  the  same  size  and  graduation,  with  stop-cocks  and  metal  feet.. per  pair  $6.00 

3014.     COLOR  COMPARISON  TUBES,  Camp,  graduated  for  manganese  determination  in  steel.     Larger 

tube  has  glass  stopper  ground  in per   set     6.00 

COLOR  COMPARISON  TUBES,  Eggertz,  for  the  estimation  of  carbon  and  manganese  in  steel  by 
the  colorimetric  method. 

No A  B  C 

Capacity,  cc 30  50  100 

Graduated  in,  cc Mo  Mo  M> 

3016.  Per  set  of  two 3.00  3.60  5.00 

3017.  Per  set  of  four 6.00  7.20  10.00 

COLOR  COMPARISON  TUBES,  Eggertz,  same  as  No.  3016,  but  with  ground  in  glass  stopper. 

No A  B  C 

Capacity,  cc 30  50  100 

Graduated  in,  ec Mo  Mo  M; 

3018.  Per  set  of  two 3.90  4.50  5.90 

3019.  Per  set  of  four 7.80  9.00  11.80 

COLOR  COMPARISON  TUBES,  Julian's,  same  as  No.  3016,  but  with  bent  ends  to  permit  mixing 
of  contents  without  using  a  stopper.  The  lower  portion  of  the  tube  is  ungraduated. 

No A                     B  C 

Graduated  from,  cc 5  to  30             10  to  50  10  to  70 

Graduated  in,  ec Mo                     Vio  % 

3020.  Per  set  of  two 3.30                   4.20  4.80 

3021.  Per  set  of  four 6.60                   8.40  9.60 

COLOR  COMPARISON  TUBES,  Julian's,  same  as  No.  3020,  but  with  funnel  tops  to  facilitate 
pouring  in  the  sample. 

No A  B  C 

Graduated  from,  cc 5  to  30  10  to  50  10  to  70 

Graduated  in,  cc Mo  Mo  % 

3022.  Per  set  of  two 3.50  4.40  5.00 

3023.  Per  set  of  four 7.00  8.80  10.00 

3024.  COLOR  COMPARISON  TUBES,  Nessler,  usual  form  for  ammonia  test,  of  clear  colorless  glass 

with  polished  bottoms. 

No A  B  C 

Graduated  at,  ee 50  100  50  &  100 

Each 65  .80  .90 

COLOR  COMPARISON  TUBES,  Nessler,  American  Public  Health  Association  Standard.  Tall  form 
of  clear  glass  with  polished  bottoms.  Graduations  agree  within  6  mm  and  are  about  210  mm 
on  50  cc  tube  and  325  mm  on  the  100  cc  tube  from  the  bottom.  (See  Standard  Methods  of 
Water  Analysis  for  1915,  pages  16  and  18.)  In  sets  to  agree. 

No A  B  C 

Graduated  at,  ce 50  100  50  &  100 

3026.  Each .85  1.30  1.60 

3027.  Per  set  of  six 5.80  8.60  10.55 

3028.  Per  set  of  twelve 12.00  18.00  22.50 


154 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


3029. 
3030. 
3032. 

3040. 


3041. 
3042. 

3044. 


No.  3030. 


No.  3040. 


No.  3032. 


No.  3044. 


3045. 
3046. 


STAND  for  Nessler  Tubes,  of  wood  stained  black,  with  base  covered  with  milk  glass  plate.  For 
twelve  tall  form  50  cc  tubes.  Without  tubes  $5.00 

CAMERA  for  use  with  color  comparison  tubes.  Improved  form,  so  constructed  that  the  shadow 
of  the  edge  of  the  box  cannot  be  thrown  on  the  tubes;  with  blue  and  ground  glass 12.00 

COLOR  TUBE,  of  brass,  24  inches  long,  2%  inches  in  diameter,  closed  at  end  by  polished  plate 
glass,  held  in  place  by  a  screw  cap.  Easily  cleaned 12.00 

COLORIMETERS 

COLORIMETER,  Campbell-Hurley,  for  use  in  determining  carbon  in  steel,  for  water  and  urine 
analysis,  and  in  general  colorimetric  work.  The  telescope  attachment  furnishes  a  circular  field 
divided  vertically,  rendering  comparisons  rapid  and  exact.  The  color  of  the  standard  solution 
is  controlled  by  raising  and  lowering  a  glass  plunger  in  a  reservoir  attached  to  one  tube.  Com- 
plete as  illustrated  with  standard  cylinder  graduated  to  100  cc  in  1  cc  divisions,  and  with  cylin- 
der for  unknown  graduated  to  100  cc  in  10  ce  divisions.  (See  Journal  of  the  American 
Chemical  Society,  Vol.  XXXIV,  No.  7,  for  July  1912) 20.00 

GRADUATED  CYLINDER  only  for  No.  3040,  for  unknown  solution 1.25 

GRADUATED  CYLINDER  only  for  No.  3040,  with  attached  reservoir  and  glass  plunger,  for 
standard  solution  4.00 

COLORIMETER,  Duboscq,  the  standard  instrument  for  the  determination  of  nitrogen,  urea, 
ammonia,  creatine,  and  ereatinine  in  blood  and  urine  according  to  the  methods  of  Dr.  Otto 
Folin.  Also  used  for  a  variety  of  other  determinations  in  physiological  and  analytical 
chemistry.  Will  yield  results  accurate  to  within  one  per  cent.  Height  of  glass  cylinders, 
10  em , '.  120.00 

Accessories  for  No.  3044. 

GLASS  CYLINDER,  10  cm  high 3.50 

Glass  Plunger,  10  cm  high 7.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


155 


No.  3050. 


No.  3050A, 


3050.  COLORIMETER,  Hess-Ives  Tint  Photometer,  for  comparing  different  shades  and  hues  of  light 

colored  materials  or  liquids  with  each  other  and  with  fixed  standards.  The  instrument  is  used 
like  a  telescope,  presenting  to  the  eye  a  circular  field  with  vertical  hairline  central  division,  one 
side  of  which  is  filled  with  light  passing  through  a  slit  directly  from  a  standard  white  magnesia 
block,  while  the  other  is  filled  with  light  passing  through  a  slit  from  the  sample  whose  color  is 
to  be  evaluated.  The  slits  are  adjustable  in  width,  and  are  provided  with  graduated  scales 
from  which  a  direct  comparison  of  the  degree  of  whiteness  of  two  samples  may  be  read.  The 
light  coming  from  the  slits  is  thoroughly  mixed  and  spread  across  the  half  fields  by  means  of  a 
patented  revolving  optical  mixing  wheel  inserted  between  the  slits  and  the  field  lens. 

Comparisons  of  colors  may  be  made  just  as  readily  by  making  successive  measurements  through 
three  color  screens,  pure  red,  green  and  blue-violet.  The  instrument  eliminates  entirely  the  per- 
sonal equation  and  offers  a  fixed  standard  of  color  measurements  which  may  readily  be 
reproduced. 

This  instrument  is  especially  adapted  for  use  with  oils,  paper,  flour,  sugar,  soaps,  pigments,  etc. 
Complete  as  described  with  motor  for  operating  optical  mixing  wheel,  on  adjustable  supports  $175.00 

3050A.  CABINET  for  Xo.  3050,  constructed  of  hardwood,  nicely  finished  and  provided  with  drawers  and 
cabinets  for  the  storage  of  accessories.  This  cabinet  provides  a  convenient  and  portable  dark 
room  for  color  measurements 60.00 

3051.  DAYLIGHT  LAMPS  for  use  with  Xo.  3050,  providing  a  definite  and  constant  illumination. 

No A  B 

For  volts 110  220 

Each    .  20.00  20.00 


156 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


9      10     « 


No.  3048. 


3048.  COLORIMETER,  Dunning,  for  estimating  the  quantity  of  phenol-sulphone-phthalcin  excreted 
when  applying  the  Rowntree-Gerahty  renal  functional  test.  Complete  with  colorimeter  box, 
empty  ampoule,  and  13  calibrated  test  ampoules  varying  in  color,  in  polished  wooden  box, 
2%x3:%x5  inches.  (See  Journal  of  Pharmacology  and  Experimental  Therapeutics,  Vol.  I,  No. 
6,  for  July  1910,  page  579;  also  the  Journal  of  the  American  Medical  Association,  Vol.  LVII, 
No.  10,  page  811) $6.00 

PHENOL-SULPHONE-PHTHALEIN  AMPOULES,  for  use  with  No.  3048,  containing  sterile,  bio- 
logically standardized  solution  of  the  mono-sodium  salt,  of  strength  6  mg  to  each  cc;  in  box  of 
10  ampoules per  box  1.00 


3049. 
3052. 


COLORIMETER,  Kuttner's  Micro,  for  directly  estimating  haemoglobin  and  sugar  in  the  blood; 
uric  acid,  creatine,  and  creatinine  in  blood  and  urine;  and  for  determining  the  renal  function 
according  to  the  method  of  Rowntree  and  Gerahty.  The  instrument  consists  of  a  closed  upright 
box  2.5x2.5x8.5  cm,  with  openings  for  the  graduated  and  the  standard  color  tubes.  The  tubes 
are  viewed  through  a  window  in  the  front  provided  with  a  Helmholtz  double  plate,  which  shows 
the  colors  in  a  continuous  band,  rendering  the  comparison  very  exact.  A  sliding  door  forms 
the  front  of  the  box  and  affords  protection  to  the  prism.  The  size  of  the  outfit  enables  it  to 
be  carried  in  the  pocket.  Complete  with  housing  of  hard  rubber  with  Helmholtz  double  prism 
and  sliding  door;  one  each  pipettes  25  cmm,  0.1  cc,  0.2  cc,  and  2  cc;  two  graduated  10  cc  test 
tubes;  one  transfer  pipette;  graduated  solution  tube  holding  140  cmm;  and  pocket  carrying 
case  with  sufficient  space  for  several  standard  color  tubes.  (See  Journal  of  the  American 
Medical  Association  July  17,  1915,  pages  245  and  246;  and  April  29,  1916,  pages  1370-1373)  18.00 

Extra  Parts  for  Kuttner  Micro-Colorimeter. 

3053.  Colorimeter  Housing,  of  hard  rubber,  with  prism 8.00 

3054.  Pipette,  graduated  to  25  cmm 1.00 

3055.  Pipette,  0.1  cc,  graduated  in  0.01  cc 1.00 

3056.  Pipette,  0.2  cc,  graduated  in  0.02  ec 1.00 

3057.  Pipette,  2  cc,  graduated  in  0.2  cc 1.00 

3058.  Pipette,  Transfer 20 

3059.  Test  Tube,  graduated  to  10  cc .90 

3060.  Tube,  Solution,  for  diluting  unknown  to  match  standard  color,  graduated  to  140  cmm 1.50 

3061.  Pocket  Carrying  Case,  with  space  for  several  standard  color  tubes 2.50 

REAGENTS  FOR  KUTTNER  MICRO-COLORIMETER. 

In  glass  stoppered  bottlea 
1  oz.         2  oz.        4  oz. 

Acid,  Acetic,  1%  solution  for  determining  uric  acid  in  blood .25  .40 

Acid,  Hydrochloric,  normal  solution  for  determining  creatine  in  urine.     ...  .25  .40 

Acid,  Hydrochloric,  ],{0  normal  solution  for  determining  haemoglobin.     ...  .20  .35 

Acid,  Picric,  C.  P.,  saturated  solution  for  determining  sugar  in  blood, 

creatine  and  creatinine  in  urine,  and  ereatinine  in  blood .50         1.00 

Acid,  Uric  Reagent,  for  determining  uric  acid  in  renal  calculi,  urine, 

blood 90  

Colloidal  Iron,  5%  solution  for  determining  uric  acid  in  blood  and 

urine,  and  creatinine  in  blood .30  .50 

Phenol-Sulphone-Phthalein,  in  sterile  ampoules per  box  of  10     1.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


157 


No.  3080. 
REAGENTS  FOR  MICRO-COLORIMETER,  Continued. 


In  glass  stoppered  bottles 


1  oz. 


2  oz.        4  oz. 


Sodium  Acetate,  C.  P.,  saturated  solution  for  determining  uric  acid 

in  blood ..  ...  25  .40 

Sodium  Carbonate,  saturated  solution  for  determining  uric  acid  in 

renal  calculi,  urine,  blood .25  .40 

Sodium  Carbonate,  10%  solution  for  determining  sugar  in  blood .20          .35 

Sodium  Fluoride,  2%  solution  for  determining  sugar  in  blood 40 

Sodium  Hydroxide,  10%  solution  for  determining  creatinine  and  crea- 

tine  in  urine,  creatinine  in  blood,  and  uric  acid  in  renal  calculi .30  .50 

STANDARD    COLOR    SOLUTION    TUBES   FOR   USE    WITH   KUTTNER   MICRO-COLORIMETER. 
TESTED   AND   APPROVED   BY  DR.   KUTTNER. 

3068.  Haemoglobin  Test  Standard  Tube,  equivalent  to  15  grams  haemoglobin  or  20  cc  oxygen  (Oo) 

2.00 

3069.  Carbonyl  Haemoglobin  Standard  Tube,  equivalent  to  20%  oxygen  (O2) 5.00 

3070.  Sugar  Test  Standard  Tubes,  a  set  of  two,  A  and  B,  the  former  being  equivalent  to  0.1  per  cent,  of 

sugar,  the  latter  having  twice  that  concentration. 

Xo A  B 

Per  tube 1.00  1.00 

3071.  Phenol-Sulphone-Phthalein  Test  Standard  Tubes,  a  set  of  three,  the  No.  1  tube  reading  directly 

in  percentage,  the  Xos.  2  and  3  tubes  being  weaker  in  the  proportions  2  and  4. 

Xo 1  2  3 

Per  tube 1.00  LOO  1.00 

3072.  Uric  Acid  Test  Standard  Tubes  for  determining  uric  acid  in  blood,  a  set  of  two,  A  and  B,  the 

former  being  equivalent  to  0.01  mg  and  the  latter  to  0.005  mg. 

Xo A  B 

Per  tube 1,00  1.00 

3073.  Uric  Acid  Test  Standard  Tube  for  determining  uric  acid  in  nrine  and  stone,  equivalent  to  0.02 

mg   L50 

3074.  Creatine  and  Creatinine  Test  Standard  Tubes  for  nrine,  a  set  of  two,  A  and  B,  the  former 

equivalent  to  0.01  mg,  the  latter  to  0.02  mg. 

Xo A  B 

Per  tube LOO  1.00 

3075.  Creatinine  Test  Standard  Tubes  for  blood,  a  set  of  two,  A  and  B,  the  former  equivalent  to  0.01 

mg,  the  latter  to  0.02  mg. 

Xo A  B 

Per  tube LOO  1.00 

3080.  COLORIMETER,  Myers,  a  simple  and  inexpensive  outfit  for  clinical  purposes,  consisting  of  a 
box  containing  two  tubes  26x1.2  cm  graduated  from  5  to  25  cc.  Comparison  of  colors  is  made  in 
the  nngraduated  part  through  an  opening  2.2x1  cm  against  a  white  glass  background.  The  un- 
known is  diluted  by  the  addition  of  water  from  the  diluting  pipette,  until  the  colors  match. 
Calculations  are  very  simple.  Complete  with  housing,  filling  pipette  with  rubber  bulb,  holder 
for  pipette  and  two  graduated  tubes,  in  card-board  box  with  directions  for  use.  (See  the  Journal 
of  Laboratory  and  Clinical  Medicine,  VoL  I,  No.  10,  for  July  1916,  page  760) 8.00 


158 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  3082. 


No.  3088. 


No.  3089. 


3082.  COLORIMETER,  Kober  Nephelometer,  for  use  in  accurate  colorimetric  and  nephelometrie  deter- 

minations in  chemical  and  biological  work,  with  any  depth  of  liquid  up  to  110  mm.  The  opti- 
cal parts  are  arranged  to  give  a  Lummer-Brodhun  field,  with  the  light  from  one  side  forming 
a  square  area  enclosed  by  the  circular  area  of  light  from  the  other  side.  The  plungers  are 
made  of  opaque  black  tubing  with  glass  ends  fused  on,  as  are  also  the  glass  cups  for  colori- 
metrie  uses.  The  cups  for  nephelometrie  uses  are  made  of  clear  glass  tubing  with  black 
opaque  glass  bottoms  fused  on.  The  cups  are  raised  and  lowered  by  a  screw  with  a  double 
milled  head,  which  gives  the  effect  of  a  double  adjustment.  An  accurately  divided  scale  is 
provided,  and  the  verniers  are  adjustable  enabling  the  instrument  to  be  set  quickly  at  zero. 
The  framework  can  be  tilted  like  a  microscope  and  securely  clamped  in  any  position.  The 
source  of  light  for  nephelometrie  work  is  a  concentrated  filament  lamp  in  front  of  which  is 
mounted  a  condensing  lens  to  bend  the  rays  of  light  parallel.  The  reflecting  mirrors  are  in 
pairs  so  that  any  inequalities  in  the  light  falling  on  the  two  sides  of  the  instrument  may  bo 
corrected.  The  entire  instrument  is  enclosed  in  a  metal  housing  which  effectually  cuts  out 
any  stray  light  and  protects  the  parts  from  dust.  Complete  with  2  long  and  2  short  Colori- 
metric Cups  No.  3090,  2  long  and  2  short  Nephelometrie  Cups  No.  3091,  Lamp-house  with  110 
volt  lamp,  cord  and  plug,  mounted  on  a  black  polished  board  with  switch;  with  directions  for 
use.  (See  the  Journal  of  Biological  Chemistry,  Vol.  XXIX,  No.  2,  for  March  1917,  page  155) 
, $105.00 

Parts  and  Accessories  for  No.  3082. 

3083.  Lamp-House  only,  without  lamp 27.50 

3084.-    Concentrated  Filament  Lamp  for  110  volts 2.00 

3085.  Zero  Gage   30 

3086.  Plungers,  of  black  glass  with  clear  fused  bottoms   per  pair     4.00 

3087.  Colorimetric  Cups,  of  black  tubing  with  blue  bottoms,  for  use  with  artificial  light. 

No A  B 

Style    long  short 

Per  pair 4.50  4.50 

3088.  Colorimetric  Cups,  of  black  tubing  with  white  bottoms,  for  use  with  daylight. 

No '. . . .  A  B 

Style    long  short 

Per  pair 4.00  4.00 

3089.  Colorimetric  Cups,  of  white  tubing  with  blue  bottoms,  for  use  with  artificial  light.  These  are 

adapted  for  uses  requiring  that  the  liquid  be  kept  under  observation  by  the  operator. 

No A  B 

Style    long  short 

Per  pair 3.50  3.50 

3090.  Colorimetric  Cups,  of  white  tubing  with  white  bottoms,  for  use  with  daylight. 

No '. . . .           A  B 

Style    long  short 

Per  pair 3.00  3.00 

3091.  Nephelometrie  Cups,  of  white  tubing  with  black  bottoms. 

No A  B 

Style   long  short 

Per  pair 4.00  4.00 

3092.  Portable  Dark  Room  for  use  with  No.  3082 . .  35.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


No.  3094. 


NO.  3098. 


Nos.  3100-4 


No.  3102. 

3094.  COLORIMETER,  Schreiner's,  as  used  in  the  Laboratory  of  the  Bureau   of   Soils,  United  States 

Department  of  Agriculture.  All  parts  of  the  instrument  which  come  in  contact  with  the  solu- 
tions are  of  glass.  The  Colorimeter  consists  essentially  of  two  graduated  glass  tubes  which 
contain  the  standard  and  the  unknown  colorimetric  solutions,  with  two  smaller  glass  immersion 
tubes  by  means  of  which  the  length  of  the  column  of  liquid  in  the  graduated  tubes  may  be 
changed.  These  tubes  are  mounted  on  the  colorimeter  stand  by  an  improved  method  which 
makes  their  adjustment  exceedingly  simple  and  permits  a  rapid  and  easy  setting  while  the 
comparisons  are  being  made.  Complete  with  graduated  and  plain  tubes.  (For  full  description 
see  Journal  of  the  American  Chemical  Society,  Volume  XXVII,  September  9,  1905,  and  Bul- 
letin Xo.  31,  United  States  Department  of  Agriculture,  Bureau  of  Soils) $20.00 

3095.  TUBES,  Graduated,  for  No.  3094,  with  100  scale  divisions,  2  mm  apart per  pair    5.00 

3096.  TUBES,  Immersion,  for  Xo.  3094,  26  cm  long  with  polished  bottoms per  pair       .90 

3098.     COLORIMETER,  Ukena's  Comparator,  widely  used  in  determining  carbon  and  manganese  in  iron 

and  steel  by  the  Eggertz  method.  Complete  with  stand,  ground  glass  plate,  and  10  Eggertz 
carbon  tubes  with  ground  stoppers,  graduated  to  30  cc  in  i{0  cc  divisions 35.00 

3100.  COLORIMETER,  United  States  Geological  Survey  Standard  Outfit,  for  determining  color  in  watel 
analysis.  The  method  consists  in  comparing  the  color  of  the  water  under  examination  with 
that  of  a  series  of  glass  disks,  rated  in  color  values  according  to  the  platinum-cobalt  scale  of 
parts  of  platinum  per  million.  Colorimeter  complete  with  4  aluminum  tubes,  one  with  clips  for 
holding  disks,  and  others  respectively  50,  100  and  200  mm  long,  for  holding  water  to  be  tested; 
six  standard  disks  of  amber  colored  glass  mounted  in  aluminum;  in  compact  morocco  covered 
case.  (See  Bulletin  151  of  the  United  States  Geological  Survey) 38.50 

3102.  TURBIDITY  SCALE,  United  States  Geological  Survey  Standard,  made  of  aluminum,  8  inches 
long  and  graduated  in  parts  per  million.  To  one  end  is  attached  a  tape  4  feet  long,  similarly 
graduated.  Into  the  other  end  is  fastened  a  nickel-plated  brass  screw  eye  containing  a  piece  of 
rolled  platinum  wire  to  be  viewed.  The  depth  of  its  disappearance  to  the  eye  indicates  the 
turbidity.  Complete  in  case. 7.50 

3104.  COLOR  AND  TURBIDITY  OUTFIT,  consisting  of  Nos.  3100  and  3102,  combined  in  morocco  cov- 
ered case  .  45.00 


160 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  3120-2. 

COMBUSTION  APPARATUS 

3120.    COMBUSTION  APPARATUS,  C.  M.  Johnson's,  for 

the  determination  of  carbon  in  iron,  steel,  ferro- 
alloys, etc.  With  this  outfit  a  single  combustion  can 
be  completed  in  25  minutes.  Complete  as  illustrated 
with  Hoskins  Electric  Combustion  Furnace,  mer- 
cury pressure  gage,  drying  jar  for  solid  absorbents,  ( 
safety  jar  for  potassium  hydroxide  solution,  calcium  ' 
chloride  and  soda  lime  jars,  mercury  valve,  fused 
silica  combustion  tube,  jar  for  granular  zinc,  jar  for 
phosphorus  pentoxide,  absorption  tube  for  carbon 
dioxide,  and  connections.  (See  "Rapid  Methods  for 
the  Chemical  Analysis  of  Special  Steels,  Steel  Mak- 
ing Alloys,  and  Graphite,"  by  C.  M.  Johnson.) 

No. 

No A  B 

h  With  furnace  and  rheostat  for,  volts 110  220 

Each $50.00  50.00 

3122.  COMBUSTION  APPARATUS,  C.  M.  Johnson's,  same  as  No.  3120,  but  with  Multiple  Unit  Elec- 

tric Combustion  Furnace  No.  6226. 

No A  B 

With  furnace  and  rheostat  for,  volts 110  220 

Each 50.00  60.00 

Parts  for  Johnson's  Combustion  Apparatus. 

Hoskin's  Electric  Combustion  Furnaces. 

No A  B 

For  volts 110  220 

6210.  Furnace  only 25.00  25.00 

6211.  Furnace  with  rheostat 33.50  33.50 

Multiple  Unit  Electric  Combustion  Furnace,  for  use  on  either  110  or  220  volts. 

6226.  Furnace  only 25.00 

6227.  Furnace  with  rheostat  (voltage  must  be  specified)    33.50 

3186B.  Combustion  Tube,  of  opaque  fused  silica  for  Nos.  3120  and  3122, 24  inches  long  and  %  inch  inside 

diameter i 6.00 

3123.  Mercury  Pressure  Gage,  (A)  to  indicate  leakage  of  joints  or  stoppage  of  flow 90 

3124.  Jar  for  Solid  Absorbent,  (B)  such  as  potassium  hydroxide  sticks 1.50 

3125.  Safety  Jar,  (C)  for  potassium  hydroxide  solution    1.50 

3126.  Calcium  Chloride  Jar,  (D) 1.50 

3127.  Soda  Lime  Jar,  (E) 1.50 

3128.  Mercury  Valve,  (F)  to  prevent  back  flow 80 

3129.  Jar  for  Granular  Zinc,  (H)  to  absorb  acid,  lead,  sulphur,  and  chlorine  vapors 80 

3130.  Jar  for  Phosphorus  Pentoxide,  (I)  to  absorb  water 60 

3131.  Absorption  Tube,  for  Carbon  Dioxide,  (J)  to  be  weighed  for  calculating  percentage  of  carbon 

1.00 

Combustion  Tube,  Clay,  C.  M.  Johnson's,  see  No.  3178. 

3134.  MILLING  MACHINE,  C.  M.  Johnson's,  for  obtaining  iron  and  steel  samples  for  use  in  combus- 
tion apparatus 42.00 

3136.  "Rapid  Methods  for  the  Chemical  Analyses  of  Special  Steels,  Steel  Making  Alloys,  and  Graphite' ' 
by  C.  M.  Johnson,  describing  No.  3120  Combustion  Apparatus 3.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


161 


Nos.  3138-40. 


3138.  COMBUSTION  APPARATUS,  Vanier's,  for  determining  carbon  in  iron  and  steel  by  the  combus- 
tion method.  Complete  as  illustrated,  with  Hoskins  Electric  Combustion  Furnace  with  rheo- 
stat, two  four-liter  aspirator  bottles,  potash  bulb,  calcium  chloride  tube,  fused  silica  combus- 
tion tube,  zinc  tube,  sulphuric  acid  bulb,  Vanier  's  Combined  Absorption  Bulb  and  Drying  Tube 
(patented),  two  3%x%  inch  Alundum  combustion  boats,  %  Ib.  of  E.  B.  Alundum  and  with 
necessary  connecting  tubing,  supports,  clamps,  glass  rods,  etc.,  but  without  oxygen  tank. 

No A  B 

With  furnace  for,  volts 110  220 

Each $62.00  62.00 

3140.  COMBUSTION  APPARATUS,  Vanier's,  same  as  No.  3138,  but  with  Multiple  Unit  Electric  Com- 

bustion Furnace  No.  6226. 

No A  B 

With  furnace  and  rheostat  for,  volts 110  220 

Each 62.00  62.00 

Parts  for  Vanier  Combustion  Apparatus. 

Hoskins  Electric  Combustion  Furnaces. 

No A  B 

For  volts 110  220 

6210.  Furnace  only 25.00  25.00 

6211.  Furnace  with  rheostat 33.50  33.50 

Multiple  Unit  Electric  Combustion  Furnace,  for  use  on  either  110  or  220  volts. 

6226.  Furnace  only 25.00 

6227.  Furnace  with  rheostat  (voltage  must  be  specified)    33.50 

1614F.  Aspirator  Bottles  (H),  four -liter,  with  rubber  tube  outlet  at  bottom,  for  use  in  keeping  pressure 

constant,  the  lower  one  being  filled  with  water each     1.75 

3141.  Potash  Bulb  (A),  for  purifying  oxygen  before  entering  tube 70 

2320A.  Calcium  Chloride  Tube  (B),  for  drying  the  oxygen  gas 1.40 

3186B.  Combustion  Tube  (D),  of  Opaque  Fused  Silica,  glazed,  24  inches  long  and  %  inch  inside  diameter 

6.00 

3143.  Vanier  Zinc  Tube  (E),  to  be  filled  with  granulated  zinc  for  removing  sulphur  and  acid  fumes    1.10 

3144.  Vanier  Sulphuric  Acid  Tube  (F),  for  absorbing  moisture 1.90 

124.     Vanier  Absorption  Bulb   (G),  for  carbon  dioxide,   a   combined  potash   and   drying  tube,  to  be 

weighed  for  determining  percentage  of  carbon  in  sample 10.50 


No.  3152. 


No.  3150. 


3150.    COMBUSTION  BOATS,  of  Alundum,  especially  adapted  for  the  determination  of  carbon  in  iron 


they   may   be   used  repeatedly. 
With  handle. 


3152. 


and  steel.     Since  the  alundum  is  not  affected    by   iron    oxide 

Furnished  in  fine  mixture  only.     Thickness  of  wall,  ^  inch. 

No '. A              B  C  D  E 

Length,  inches   3V2           3%  4^  5  5% 

Width,  inches  V2             %  %  %  % 

Depth,  inches   <K6            %  fte  ifa  ^6 

Each    30            .35  .40  .40  .40 

COMBUSTION  BOATS,  Porcelain,  glazed  throughout,  with  ring  handle. 

No A              B  C  D  E 

Length,  mm 60  60  75  75  100 

Width,  mm 7  10  11  15  18 

Each   .                                22  .22  .24  .26  .28 


162 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  3164. 


No.  3162. 


c.s.co. 


No.  3160.  No.  3166. 

3154.    COMBUSTION  BOATS,  Johnson's,  of  vitrified  clay,  without  handle.    Thickness  of  wall,  yic  inch. 

No A  B  C  D 

Length,  inches   4  4  4%  5% 

Width,  inches %  %  %  % 

Depth,  inches %  Vw  %  Vie 

Each   $0.13         .17  .16  .21 

3156.     COMBUSTION  BOATS,  Opaque  Fused  Silica,  glazed  on  both  sides,  without  handle. 

No A  B  C 

Length,  inside,  mm 44  76 

Width  inside,  mm 13  13 

Depth  inside,  mm 8  8  10 

Each   ! 63  .94          1.13 

3158.     COMBUSTION  BOATS,  Iran  parent  Quartz,  8  mm  wide  by  5  mm  deep.     With  ring  handle. 

No A  B  C 

Length,  mm 50  65  75 

Each   3.60  4.80  6.00 

3160.     COMBUSTION  BOAT  LINING,  of  B  E  Alundum,  a   very  pure   crystalline  alumina  treated  to 
remove  carbonaceous  matter  and  surface  alkali;  used  as  a  lining  for  boats  of  platinum,  porce- 
lain, clay  and  alundum  to  afford  protection  from  fluxing  during  combustion.     Supplied  in  glass 
stoppered  bottles  in  Nos.  60,  90  and  120  mesh. 
Please  specify  mesh  in  ordering. 

Size  bottle,  pounds %  1  2 

Each 50  .85          1.50 

3162.     COMBUSTION  BOAT  SHIELDS,  of  Alundum,  to  protect  combustion  tubes  from  the  spattering 
.    of  overheated  metals. 

No A  B 

Length,  inches 4%  5M> 

Bore,  inches Hie  J9i6 

Diameter  outside,  inches %  % 

Each   75  1.00 

3164.  COMBUSTION  CAPSULES,  of  Alundum,  for  ashing  coal,  flour,  etc.  Will  withstand  high  tem- 
perature and  can  be  used  repeatedly.  Made  in  mixture  BA  84. 

No A  B  C  D 

'  Diameter,  inches l%g  1%G  1%  1% 

Height,  inches %e  %  %  % 

Capacity,  ce 10  18  25 

Each    25  .30  .40  .35 

3166.  COMBUSTION  CAPSULES,  of  Best  American  Porcelain,  without  lip,  as  recommended  for  the  de- 
termination of  ash  in  coal  or  coke  by  the  Joint  Committee  of  the  American  Chemical  Society 
and  the  American.  Society  for  Testing  Materials.  (See  Journal  of  Industrial  and  Engineering 
Chemistry,  January  1917). 

No A  B 

Diameter,  inches 1%  2 

Depth,  inches   %  l^ie 

Each    20  .20 

3170.  COMBUSTION  CAPSULES,  of  Opaque  Fused  Silica,  for  ash  determinations  and  ignitions.  Depth, 
%  inch. 

No A  B  C  D 

Diameter,  inches   1%  1%  2  2% 

Capacity,   cc 10  15  20  35 

Each    75  .76  1.13  1.25 

For  other  CAPSULES,  see  No.  2408. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


163 


No.  3182. 


Nos.  3178,  79  and  80. 

3178.  COMBUSTION  TUBES,  Clay,  Vitrified,  C.  M.  Johnson's,  for  use  in  carbon  determinations  in 

iron  and  steel.     (See   Journal  of  Industrial  &  Engineering  Chemistry,  VoL  V,  No.  7,  for  July 

1913,  page  581.) 

No A  B 

Length,  inches   23%  27% 

Diameter  inside,  inches %  1^6 

Diameter   outside,   inches lUr.  1*4 

Each   $4.25  5.25 

3179.  TAPEEED  CLAY  CONNECTORS,  for  Combustion  Tubes  Xo.  3178,  wi^iout  rubber  sleeve. 

For  tube A  B 

Each    1.75  2.00 

3180.  BXTBBER  SLEEVES  for  use  with  Nos.  3178  and  3179. 

For  tube A  B 

Each    1.75  2.00 

3182.     COMBUSTION  TUBES,  of  Best  American  Porcelain,    glazed   inside   and   outside,   60   cm   long. 

Thickness  of  wall,  about  3  mm.     Diameter  inside,  mm 15  18  25 

Each    3.25        4.10        4.75 

Note: — For  special  lengths  add  or  subtract  1/100  of  price  for  each  em  of  difference  from  stock 
lengths. 

COMBUSTION   TUBES,   Opaque   Fused   Silica,  melting  point  about  1500  degrees  C.;  unaffected 
by  sudden  changes  in  temperature.     Length,  60  cm;  thickness  of  wall,  2  mm. 

No A  B  C 

Diameter  inside,  mm 15  18  22 

3184.  Each  unglazed 438  5.25  5.75 

3186.  Each  glazed 5.63  6.00  7.00 

3187.  COMBUSTION  TUBES,  Pyrex  Glass,  for  use  in  oxidation  and  reduction  experiments,  etc. 

No A  B  C 

Length,  mm 200  300  450 

Diameter  inside,  mm 5  10  19 

Each    16          .22  .60 

3188.  COMBUSTION  TUBES,  Pyrex  Glass,  100  cm  long.    Thickness  of  wall,  2  to  3  mm. 

Diameter    inside,    mm 12  18  20  25 

Each    90        1.50        1.80        2.00 

For  COMBUSTION  TUBING  see  No.  7206. 

COMBUSTION   TUBES,    Transparent   Quartz.     These  tubes  can  be  furnished  in  any  length  and 

with  wall  of  three  different  thicknesses;  thin    (0.5   mm),  medium  (0.75  mm)    and  heavy   (1 
mm).     The  prices  given  are  per  10  cm  of  length. 

Bore,  mm   1         2          3          5         10        15  20  30         40           50 

3190.  Per  10  cm,  thin  wall. 42       .60       .90     1.20     1.92     2.82  3.90  5.70       9.00       12.00 

3191.  Per  10  cm,  medium  wall 60       .90     1.20     1.80     2.88     4.20  5.70  8.52     13.50       18.00 

3192.  Per  10  cm,  heavy  wall 90     1.20     1.50     2.40     3.90     5.70  7.50  11.40     18.00       24.00 


No.  F521. 


No.  F523. 


F521. 


F523. 


COMPASS,  Eagle  Pencil.     The  most  universally  used  school  compass.     Pen,  pencil,  divider  and 
compass  combined.     Provided  vrith  set  nut.     Size  5%   inches  over  all.     Complete  with  extra 

leads  Each  .30 

Per  dozen      3.00 
COMPASS,  Pencil.     Easily  attached  to  a  common  pencil.     Solid  steel  leg,  durable  and  accurate. 

Without   pencil   Each  .15 

Per  dozen      1.50 


164 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  F2617. 


No.  F2625. 
Metal   cap   needle,  brass  case,  card  dial,  beveled  glass;  the  three 


F2615.  COMPASSES,   MAGNETIC. 
larger  sizes  with  ring. 

Diameter,  mm 

Each 

F2617.  COMPASS,  .MAGNETIC.     Agate  cap  needle,  brass  case,  brass  dial,  2°  divisions,  beveled  glass, 
with  cover. 

Diameter,  mm 


10 
$0.12 


16 
.20 


25 
.40 


40 
.65 


50 
.75 


40 
1.80 


50 
2.00 


Each 

F2619.  COMPASS,  MAGNETIC.  Agate  cap  needle.  A  low  priced  but  high-grade  compass,  with  dial  of 
enameled  card  graduated  in  5°  divisions.  The  needle  is  of  special  steel,  heavily  magnetized. 
The  case  is  brass,  gunmetal  finish,  and  has  a  diameter  of  38  mm  and  a  thickness  of  16  mm.  A 
heavy  beveled  glass  serves  as  a  cover,  making  the  whole  practically  dust  and  water-tight  $0.70 

F2621.  COMPASS,  MAGNETIC.  Agate  cap  needle,  37  mm  aluminum  pointer  and  stop  for  needle.  Brass 
case,  raised  metal  dial  with  2°  divisions.  Especially  useful  in  building  galvanoscopes,  tangent 
galvanometers,  etc.  Diameter,  50  mm 2.50 

F2623.  COMPASS,  MAGNETIC.  Agate  cap  needle,  brass  case,  raised  card  dial  with  2°  divisions,  beveled 
glass  top.  Diameter,  45  mm.  Similar  to  No.  F2621,  but  without  pointer .90 

F2625.  COMPASS,  SIGHT,  watch  case  form,  50  mm  diameter,  with  raised  dial  and  full  circle  divisions. 
Bar  needle  30  mm  long,  with  agate  cap.  Sights  and  slip  cover 11.50 

COMPRESSION  PUMPS,  see  Blowers;  Pumps,  Air. 


Our  Receiving  Room,  where  New  Goods  are  Inspected  and  Packed  for  Stock. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


165 


No.  3236. 


No.  3220.  No.  3222.    No.  3224.  No.  3225.  No.  3228. 


CONDENSERS 


No.  3240. 


3220.     CONDENSERS,  Allihn's,  of  glass  with  bulb  condensing  tube,  .with  adapter  sealed  on. 

Length  of  water  jacket,  inches 6  8  12  15  25 

Length  over  all,  inches 12  14        -       19  22  33 

Each $1.10  1.30  1.80  2.00  3.00 

',',-22.  CONDENSER,  Hopkins  Reflux,  with  inner  jacket  25  cm  long.  Excellent  for  quick  condensation, 
as  the  cold  water  jacket  in  the  center  offers  a  large  condensing  surface  to  the  vapor.  Length 
of  outside  jacket,  27*£  em;  total  length,  38  em.  (See  Journal  of  the  American  Chemical 
Society,  for  December,  1908) 3.30 

3224.     CONDENSERS,  Liebig's,  of  glass  with  rubber  connections  and  adapter. 

No A  B  C  D  E  F 

Length  of  water  jacket,  inches 10  12  15  20  25  30 

Length  of  condenser  tube,  inches 20  22  25  30  37  42 

Each    » 1.10        1.30         1.40         1.70         2.30         2.60 

322o.     CONDENSER  TUBES  only  for  No.  3224,  H  inch  in  diameter. 

Length,  inches   ." 20  22  25  30  37  42 

For  condenser  jacket,  inches 10  12  15  20       A    25  30 

Each 30  .33  .40  .45        '.60  .65 

3228.     CONDENSERS,  Liebig's,  all  of  glass,  with  inner  tube  permanently  sealed  to  jacket,  with  adapter. 

Length  of  water  jacket,  inches 10  12  "  15  20  25  30 

Length  over  all,  inches 17  19  22  28  33  38 

Each 1.40  1.60  1.90  2.50  3.50  4.50 

02:>0.  CONDENSERS,  Liebig's,  of  glass,  with  coiled  condenser  tube  sealed  in  water  jacket,  with  adapter 
sealed  on. 

,.  ..  Length  of  water  jacket,  inches 8  12  15  25 

Length  over  all,  inches 14  19  22  33 

Each 2.00  2.60  3.25  6.00 

:;2.".2.  CONDENSERS,  Liebig's,  of  polished  brass,  1%  inches  in  diameter,  fitted  with  glass  condensing 
tube  and  rubber  connections. 

Length  of  brass  jacket,  inches 15  20  30 

Length  over  all,  inches 25  30  42 

Each 3.90  4.50  600 

::2:!4.  CONDENSER,  Soxhlet's  Spherical,  of  copper,  tinned  inside  and  nickel-plated;  diameter,  4  inches 
3.60 

.S236.     CONDENSER.  Sulphurous  Acid,  Fischer's,  with  two  glass  stop-cocks  on  vertical  tubes 3.75 

3238.     CONDENSER,  Sulphurous  Acid,  Liebig's,  with  two  glass  stop-cocks  on  horizontal  tubes. . .  .     3.75 

3240.     CONDENSERS,  Zinc,  with  heavy  block  tin  worm,  for  use  with  Distilling  Apparatus  No.  4148. 

No " A  B  C  D  E 

For  still,  capacitv,  gallons %  1  235 

Height  over  all,  inches ti:^  10%  14%  15% 

Diameter  outside,  inches 7  8%  9%  12% 

Diameter  of  tin  tube,  inches :is  %  %  %  % 

Each 5.50  7.00  8.75  11.50  15.00 

3242.     CORD,  Chalk  Line,  Masons',  i/$c  inch;  in  hanks  of  20  feet Per  hank         .08 

3244.  CORD,  Fish  line.  Silk,  braided,  25  yards  on  card    -.  .Per  card         .35 

3245.  CORD,  Twisted  Flax,  fine  quality,  in  %-lb.  tolls Per  ball         .80 


166 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


3246. 


3248. 


3250. 


3252. 
3253. 
3256. 


Nos.  3246-56. 


CORES,  XX  Quality,  regular  length. 

No  

0 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

Diam.  at  small  end,  inches  .  . 

%•> 

9ie 

%     ] 

%•> 

]%., 

J%2 

vie 

%      J 

Wj 

% 

-%•> 

Per  dozen  

$0.05 

.05 

.06 

.07 

.08 

.09 

.10 

.11 

.13 

.15 

.17 

Per  gross  

.30 

.30 

.35 

.40 

.45 

.50 

.55 

.60 

.70 

.90 

1.00 

No  

11 

12 

13 

14 

15 

16 

18 

20 

22 

24 

26 

Diam.  at  small  end,  inches.  . 

We 

% 

"He 

1 

m« 

1%* 

1%2   3 

H4>   I1 

%2 

115^,, 

11%., 

Per  dozen  

.19 

.20 

.22 

.25 

.30 

.40 

.45 

.50 

.60 

.75 

.85 

Per  gross  

1.05 

1.15 

1.25     1.45 

1.65 

2.00 

2.35 

2.85     3.45 

4.20 

5.10 

CORES,  XX  Quality,  short  taper. 

No  

1 

2 

3 

4 

5 

6 

7 

8 

Diam.  at  small  end,  inches.  . 

ll,^2           1%2           1%2           1%2            %6           % 

Hie 

% 

Per  dozen  

.05 

.05 

.06 

.07 

.08 

.09 

.10 

.13 

Per  gross  

.30 

.30 

.35 

.40 

.45 

.50 

.60 

.75 

No  

9 

10 

11 

12 

13 

14 

Diam.  at  small  end,  inches  .  .  . 

2%2 

1!He 

i 

* 

1!Kf 

1 

I1/ifi 

Per  dozen  

.15 

.17 

. 

19 

.21 

, 

21 

.24 

Per  gross  

.85 

.90 

1, 

10 

1.15 

1.25 

1.40 

No  

15 

16 

18 

20 

22 

24 

26 

Diam.  at  small  end,  inches.  . 

1% 

l^e 

1 

^ie 

1  Vie 

1% 

]  %,; 

1% 

Per  dozen  

.27 

.30 

.35 

.40 

.45 

.55 

.65 

Per  gross  

1.60 

1.75 

2.00 

2.25 

2.75 

3.25 

3.75 

CORES,  XXXX  Quality,  regular  length,  far  superior  for  laboratory  work  to  the  XX  or  XXX 

quality  in  soundness  and  freedom  from  holes. 

No 0          1         2          3          4          5          6          7          8          9        10 

DAam.  at  small  end,  inches.  .     %2 

Per  dozen , 08 

Per  gross 45 

No 

Diam.  at  small  end,  inches. .    1 

Per  dozen 35 

Per  gross  

CORES,  XX  Quality,  Nos.  0  to  11  assorted,  in  gross  packages  only Per  gross       .75 

CORES,  XX  Quality,  Nos.  12  to  26  assorted,  in  gross  packages  only Per  gross    3.00 

CORES,  Selected  Grade,  regular  length,  finest  quality,  for  use  in  chemical  laboratories.  An  es- 
pecially light  cork,  practically  free  from  holes,  specially  recommended  for  use  in  laboratories 
where  distillations  and  extractions  are  made  with  volatile  liquids. 


.08 

.08 

.09 

.10 

.11 

.13 

.15 

.18 

.22 

.27 

.30 

.45 

.45 

.50 

.55 

.65 

.75 

.85 

1.00 

1.25 

1.60 

1.80 

11 

12 

13 

14 

15 

16 

18 

20 

22 

24 

26 

;fte 
.35 

% 
.38 

.40 

1 
.45 

.55 

1%2 

.65 

1%2 

.75 

.90 

11%2 

1.15 

H%2 

1.40 

H%2 

1.70 

1.00 

2,10 

2.30 

2.70 

3.05 

3.80 

4.50 

5.10 

6.80 

8.40 

10.00 

No  

0 

1 

2 

3 

4 

B 

Diam.  at  small  end,  inches  

%2 

'Ha 

% 

J%2 

]%2 

n/6" 

Per  hundred  

45 

.45 

.55 

.65 

.80 

1.00 

Per  bag  of  500  

2.00 

2 

.00 

2.50 

3.00 

3.60 

4.50 

No  

6 

7 

8 

9 

10 

11 

12 

Diam.  at  small  end,  inches  

%p 

% 

Hie 

% 

2%2 

1;Hfi 

% 

Per  hundred  

1.10 

1.35 

1.60 

2.00 

2.25 

2.35 

2.50 

Per  bag  of  500  

5.00 

6.00 

7.20 

9.00 

10.15 

10.75 

11.25 

No 13          14  15  .16  17  18          19           20 

Diam.  at  small  end,  inches i%6         1  ~^ViK  1%2  !%:>  1%2  !%•>  1H&2 

Per  hundred 2.65       3.00  3.50  4.25  5.00  5.50        6.00        8.00 

Per  bag  of  500 12.00  13.50  15.75  19.25  22.50  25.00  27.00  36.00 


CENTRAL,  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


167 


No.  3258. 


No.  3274. 


No.  3272. 


3658.     CORKS,  Flat  Specie  Corks,  XX  Quality,  with  slight  taper;  for  wide  mouth  bottles. 


No A  B  C       D         E 

Diam.  at  large  end,  in.       %  %  11%      1% 

Diam.  at  small  end,  in.      %  %  %         11% 

Length,    inches %  %  %       %        % 

Per  dozen $0.16  .16  .18      .20      .25 

Per  gross 95  .95  1.05    1.20     1.50 


F 
1% 


.30 
1.80 


1% 

.35 
2.10 


H 

1% 


.45 
2.50 


J 
1% 

1% 

.50 

2.80 


K 

1% 
1% 

.55 
3.20 


L 

2 

1% 

.65 
3.70 


2% 
2 

.75 
4.25 


.90 
5.30 


Q 

2% 

2% 

lio 

6.40 


T 

2% 
2% 


U 
3 

2% 


V 

3% 
3% 


W 

4 

3% 


X 

4% 
4% 


Y        Z 

5          6 

4%      5% 


1.25 
7.25 


1.45 
8.30 


3264. 
3266. 


3268. 


3270. 


3272. 

3274. 
3278. 


1.60     1.80     2.75     4.00     5.50     7.00  10.50 
9.30  10.30  16.50  24.50  32.50  41.00  65.00 

inch,  with  punch $0.40 


C 
9 


D 
12 


No N         P         Q       E 

Diam.  at  large  end,  in.    ZVt,      2%      2%     2%      2% 
Diam.  at  small  end,  in.    2%      2%      2%     2%      2% 

Length,  inches % 

Per  dozen 80 

Per  gross 4.75 

CORK  BORER,  hard  brass,  smallest  size, 

CORK  BORERS,  hard  brass,  in  sets,  with  punch  for  each  set. 

No A  B 

Number  in  set 3  6 

Diameter  of  borers,  inches ^ie^e  ^ie'Tie    ?is'%    ?W< 

Per  set 60  L20       2.00       3.00 

CORK  BORERS,  of  hard  brass  in  sets,  with  individual  handles,  and  punch  for  each  set. 

No A  B  C  D 

Number  in  set 3  6  9  12 

Diameter  of  borers,  inches ?ie~^ie         ?is~%6         %6~%         $i«~% 

Pet  set 1.05  2.00  3.50  5.20 

CORK  BORERS,  of  steel  tubing,  in  seta,  with    individual    handles,    and  punch  for 
Borers  differ  by  }4g  inch  in  diameter. 

No A  B 

Number  in  set 3  6 

Diameter  of  borers,   inches %-%  %-%e 

Per  set 1.25  2.50        3.50 

CORK  BORING  MACHINE.  Can  be  screwed  firmlv  to  table.  With  this  machine  it  is  possible 
to  drill  rapidly  both  rubber  and  cork  stoppers.  Complete  with  8  interchangeable  steel  drills  of 
from  %6  to  %  inch  diameter 15.00 

CORK  BORER  SHARPENER,  steel  cone  with  knife   1.75 

CORK  EXTRACTOR,  folding  form.  Can  be  used  in  place  of  corkscrew.  Especially  valuable  when 
corks  have  been  pushed  inside  bottle 20 


E 
15 

164.40 

E 
15 


7.50 
each    set. 

C 

8 


168 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TI.  8.  A. 


R.u.bbe.r  Stoppers 

— orvct— 

Tapered  Cbrk-3 


No.  8146. 


No.  3320. 


3280. 

8146. 
3286. 


3292. 
3296. 

3298. 
3300. 


3304. 
3306. 
3308. 


CORK  GAGE,  of  aluminum,  for  use  in  determining  the  proper  size  of  cork  or  rubber  stoppers 

for  bottles,  flasks,  etc.  For  rubber  stoppers  from  00  to  12  and  cork  stoppers  from  1  to  26 $0.10 

CORK  KNIFE,  with  good  quality  steel  blade  4  inches  long,  and  round  wood  handle 25 

CORK  MATS,    Suberite,   of   compressed   cork,  for  supporting  beakers,  etc.     Diameter,  12  cm. 

Thickness,    cm 1  2  4 

Each , 30  .36  .60 

CORK  PRESSES,  rotary  form. 

No A  B 

For  corks  up  to,  inches %          1%, 

Each    1.00        1.30 

CORK  RINGS,   Suberite,   of   compressed  cork,  for  supporting  flasks,  etc.     Highly  recommended 
as  a  substitute  for  straw  rings   on   account  of  their  appearance  and  durability. 

Diameter  inside,  mm 30  60  90  120  150 

Each    28  .56  .80  .95  1.40 

CORK  SHEET,  of  compressed  cork  faced  on   both    sides    with    white    glazed   paper.      Designed 
especially  for  mounting  insects  in  entomological  work.     Size  of  sheets  18x24xa4  inch. 

Per   sheet    1.00 

CORK  SHEETS,  XX  Quality,  size  4x12  inches. 

Thickness,    inches %  %Q  ^4 

Each    20  .30  .40 

Per    dozen 2.00          3.00          4.00 

CORKSCREW,  wood  handle •. 10 

CORKSCREW,  self-pulling 50 

CORKSCREWS,  twisted  wire Per  dozen    .10 


3318. 
3320. 


3321. 
3322. 


COUNTING  APPARATUS 

COUNTER,  Hand  Tally,  for  use  in  counting  colonies  of  bacteria,  and  for  other  laboratory  opera- 
tions. Fits  the  fingers  of  the  left  hand  as  shown  in  the  illustration.  Registers  up  to  100,000 .  2.25 

COUNTING  APPARATUS,  Stewart,  for  counting  colonies  of  bacteria.  Consists  of  a  hardwood 
box  12x8x6  inches,  in  which  is  placed  a  16-candle  power  incandescent  lamp  and  an  adjust- 
able support  for  carrying  the  Petri  dish,  illuminated  by  oblique  rays  from  the  lamp,  which 
do  not  pass  into  the  eyes  of  the  operator.  A  ruled  glass  plate  is  provided  on  top  of  the  box 
and  the  count  is  made  by  viewing  the  colonies  on  the  Petri  dish  through  the  glass  plate.  (See 
Journal  of  Medical  Besearch  for  January  1906) 12.00 

READING  LENS  for  use  with  No.  3320 1.50 

RULED  COUNTING  PLATE  only  of  No.  3320 6.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


169 


No.  3340. 


A  B 

No.  3328. 


No.  3330. 


No.  8341. 


:;:ii4.  COUNTING  APPARATUS,  Wolffhuegel's,  for  counting  colonies  of  bacteria.  Mounted  on  oak 
base  with  large  drawer;  furnished  with  background  plates,  black  and  white;  surface  of  the 
plates  is  covered  bv  rulings  12  cm  square $8.50 

.-!.;^5.     RULED  GLASS  PLATE  only  for  No.  3324 3.50 

3328.  COUNTING  PLATE,  Frost's,  printed  in  black  with  white  lines,  on  good  quality  Bristol  board. 
The  cross  lines  divide  the  figure  into  square  centimeters.  Four  of  these,  just  above  the  cen- 
ter, are  subdivided.  The  numbers,  40,  60  and  80,  give  the  area  of  the  disks  bounded  by  the 
circles  just  below  them.  The  area  of  each  sector,  a  and  b,  is  one-tenth  of  the  area  enclosed 
by  its  circle 10 

3330.  COUNTING  PLATE,  Jeffer's,  similar  to  No.  3328,  but  divided  by  concentric  circles  into  equal 
areas,  which  are  subdivided  by  radii  or  segments  of  radii  into  smaller  integral  portions.  The 
numbers  refer  to  the  number  of  equal  sections  within  the  area  enclosed  by  the  circle  just 
beneath  the  number.  Within  the  sectors  a  and  b  the  areas  enclosed  between  the  three  outer 
circles  are  further  subdivided  into  half-spaces.  (See  Journal  of  Applied  Microscopy  and 
Laboratory  Methods,  Vol.  I,  No.  3) 10 

8344.  MAGNIFIER  for  use  in  counting  colonies  of  bacteria,  magnifying  2^  diameters.  Recommended 
for  use  by  the  American  Public  Health  Association.  (See  Standard  Methods  of  Bacteriolog- 
ical Analysis  of  Milk,  for  1916,  page  5) 1.00 

3336.  CREMATOR,  DeKhotinsky  Electrically  Heated,  for  flaming  platinum  loops.  In  inoculating  cul- 
ture tubes  or  making  sputum  smears  the  spattering  occasioned  by  flaming  the  platinum  loop 
in  the  Bunsen  burner  flame  is  a  source  of  great  danger  to  the  health  of  the  operator.  This 
trouble  is  entirely  done  away  with  in  the  DeKhotinsky  Cremator,  in  which  the  flaming  of 
the  loops  may  be  performed  with  perfect  safety.  The  rapid  flaming  requires  only  a  few 
moments  and  is  complete,  since  the  bright  ted  heat  to  which  the  loop  is  subjected  removes 
all  carbonized  material.  The  apparatus  consists  of  a  tube  of  heat  resisting  material  4  inches 
long  by  %  inch  inside  diameter,  closed  at  one  end  and  wound  with  Chromel  wire.  This  tube 
is  mounted  in  a  neatly  finished  brass  tube  of  1%  inches  outside  diameter,  and  the  space 
between  the  two  tubes  is  filled  with  magnesia-asbestos  mixture.  This  tube  is  mounted  on  a 
base  of  asbestos  board,  fitted  with  binding  posts  for  electrical  connection  and  with  a  suitable 

support  for  the  handle  of  the  platinum  loop.      No A  B 

For  volts 110  220 

Each    10.00        11.00 

3340.  CROSS  SECTION  CHART,  made  of  extra  quality  blackboard  cloth,  with  lines  in  white,  accurately 
spaced  and  permanent.  Its  surface  takes  crayon  marks  and  permits  their  erasure  as  easily  as  a 
blackboard.  Can  be  rolled  up  when  not  in  use.  Size  of  ruled  surface,  36x36  in 4.00 

3344.  CROSS  SECTION  PAPER,  one  millimeter  divisions  with  heavy  centimeter  ruling.  In  sheets 
17x17  cm  on  transparent  onion  skin  paper. Per  quire  .30 

3346.  CROSS  SECTION  PAPER,  accurately  ruled,  printed   from   an   engraved   plate.      One   millimeter 

divisions  with  heavier  centimeter  ruling;  size  40x50  cm Per  sheet         .20 

Per  quire      4.00 

3347.  CROSS  SECTION  PAPER,  same  as  No.  3346,  continuous  ruling  in   one  millimeter   divisions,   50 

cm  wide Per  yard        .33 

3350.    CROSS  SECTION  PAPER,  ruled  in  ifoth  inch  divisions,  size  16x21  inches Per  sheet         .08 

Per  quire      1.50 
33o2.    CROSS  SECTION  TABLET,  containing  75  sheets  of  paper  metrically  ruled  with  heavy  lines  every 

cm  and  light  lines  every  2  mm,  with  note  ruling  and  marginal  line  on  opposite  side .18 

3354.    POLAR  CO-ORDINATE  PAPER,  printed  from  an  engine  divided  plate,  about  17  cm  in  diameter. 
Per  quire        .45 


170 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  3368-70. 


No.  3372. 


CRUCIBLES,  ALL  KINDS 


3360.  CRUCIBLES,  Alundum,  for  general  laboratory  use.     These  crucibles  will  stand  any  temperature 

available  in  the  laboratory,  and  this  with  their  high  thermal  conductivity,  makes  them  valuable 
for  eoal  analysis,  drying  materials,  igniting  filters,  etc.     Furnished  in  fine  mixtures  only. 

No A  B  C  D  E 

Capacity,  ce 10  20  25  30  40 

Diameter,  inches 1  Mo  1%  IVa  1%  1% 

Height,  inches 1%-.  1%6  1%  1%  1% 

Each $0.23  .30  .35  .35  .35 

3361.  COVERS,  Alundum,  for  No.  3363  Crucibles. 

No B  E 

For  crucibles,  cc 20  40 

Each 30  .35 

3364.  CRUCIBLE,  Alundum,  specially  designed  for  determining  moisture  in  coal.  Diameter,  2%  inches; 
height,  1%  inches;  capacity,  80  cc ! 35 

3366.  CRUCIBLES,  Alundum  Filtering,  for  ranid  filtration;  save  75  per  cent,  of  the  time  usually  re- 
quired. Not  affected  by  solutions  of  acids  or  alkalis  and  can  readily  be  dried  to  constant 
weight.  Recommended  by  Spencer  for  use  in  sugar  analysis.  Medium  porosity  carried  in  stock. 
Fine  and  coarse  porosities  can  be  supplied  on  short  notice. 

No A  B 

Capacity,  ce 25  35 

Diameter,  inches '. 1%  1% 

Height,  inches 1l/2  1  n/i6 

Each 30  .35 

3368.  CRUCIBLES,  Alundum  Melting,  highly' refractory,  and  well  adapted  to  experimental  electric 
furnace  work.  They  are  not  suited  for  use  where  slags  are  encountered  on  account  of  their 
absorbent  nature.  Furnished  in  fine  mixtures  only,  except  No.  3368D  which  is  porous.  Price 
of  No.  3368C  includes  cover. 

'       No A  B  C  D 

Diameter,  inches 1%  2%  2%  3 

Height,  inches 2  2%  4%  3% 

Each    75  1.00  2.00  1.25 

3370.  CRUCIBLE,  Alundum  Melting,  similar  to  No.  3368,  but  of  composition  especially  adapted  for 
work  requiring  an  extremely  refractory  body.  Platinum  has  been  melted  in  this  crucible. 
Diameter,  1%  inches;  height,  3a/4  inches 1.50 

3372.  CRUCIBLES,  Denver  Fire  Clay,  for  assay  work ;  without  covers. 

No A  B  C  D  E 

Capacity,  grams 5  10  15  20  30 

Height,  inches 2%  3  3%  3%  3% 

Diam.  at  top,  inches 2%  2%  2%  3  3% 

Approx.  number  in  original  barrel 850  500  400  350  250 

Per  dozen 60  .75  .85  .95  1.40 

Per  100  in  original  barrel 3.40  4.60  5.25  5.75  8.50 

3373.  COVERS  for  No.  3372V 

Per  dozen 45  .45  .45  .65  .75 

Per  hundred  in  original  barrel 3.00  3.00  3.00  4.50        -    5.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  S.  A. 


171 


No.  3381. 


No.  3386. 
No.  3390. 


No.  3394. 


No.  3388. 


3376.     CRUCIBLES,  Denver  Fire  Clay,  high  form,  for  gasoline  or  open  furnace  work;  without  covers. 

No D             E  F  G  J             K  L 

Height,  inches 4  4%  5  5%  6%  7%  8 

Diam.  at  top,  inches 2%            3  3%  3%  4%  4%  5>4 

Approx.  number  in  original  barrel 450  300  250  175  75  50  40 

Per  dozen $0.90  1.35  1.50  2.05  3.90  4.75  8.45 

Per  100  in  original  barrel 5.25  7.95  8.90  12.30  23.40  28.45  50.50 

COVERS  for  No.  3376. 

Per  dozen 40           .55  .60  .65  .90  1.40  1.60 

Per  hundred  in  original  barrel 2.75  3.90  4.00  5.25  6.50  10.50  12.00 


3377. 


3380. 


3381. 


3384. 


3386. 


3388. 


3390. 


3392. 
3394. 


CRUCIBLES,  Denver  Fire  Clay,  tall  narrow  or  French  form;  for  gas  or  gasoline  furnaces;  'with- 
out covers. 


No 

Height,  inches 

Diam.  at  top,  inches 

Approx.  number  in  original  barrel. 

Per  dozen 

Per  100  in  original  barrel 


COVERS  for  No.  3380. 

Per  dozen 

Per  100  in  original  barrel. 


6 

4 

2% 
450 

.90 
5.25 


.45 
3.00 


8 
5 

300 
1.65 
9.75 


.45 
3.00 


9 
5% 

3 

250 

2.10 

12.60 


.75 
6.00 


CRUCIBLE,  Clay  Filtering,  C.  M.  Johnson's,  very  strong,  resisting  pressure.  Will  produce  clear 
filtrates  and  withstand  the  full  heat  of  a  Meker  burner.  Especially  adapted  for  use  in  de- 
termining vanadium  and  chromium.  Diameter,  1%  inches;  capacity,  25  ce 1.25 

CRUCIBLES,  Copper,  spun  and  polished,  with  covers. 

No :...' A  B                C  D                E 

Capacity,  cc 20  30  50  100  250 

Diameter,  inches 1%  1%  1%  2%  3% 

Height,  inches 1%  1%                2  2%  3% 

Each    ...' 65  .75  .85  1.10  2.20 

CRUCIBLES,  Wrought  Iron,  light,  with  covers. 

Capacity,    cc , 

Diameter,   inches ." 

Height,   inches 

Each    


20 


CRUCIBLES,  Nickel,  spun  from  pure  sheet  nickel,  with  covers. 

No A  B 

Capacity,  cc 20  30 

Diameter,  inches l1^  1% 

Height,  inches 1%  1% 

Each    1.20  1.35 


.20 


50 
2% 

.22 


100 

2% 

2 

.36 


C 
50 
1% 

2 
1.45 


D 

100 
2% 
2% 
2.40 


200 
3% 
2% 
.40 


E 

250 
3% 

5.00 


CRUCIBLE,  Nickel,  Kawin's,  of  heavy  pure  nickel,  for  use  in  muffle  furnaces  for  burning  off  filter 
paper  in  silica  determinations  in  iron.  Diameter,  28  mm;  height,  15  mm 45 

CRUCIBLE,  Nickel,  Pennock  and  Martin's,  for  the  rapid  and  accurate  determination  of  sulphur 
in  coal  and  coke;  consists  of  a  pure  nickel  crucible  of  40  ce  capacity,  with  perforated  lid  for 
insertion  of  ignition  wire,  mounted  upon  an  aluminum  base.  Diameter  of  crucible,  1%  inches; 
height,  1%  inches.  (See  Journal  of  the  American  Chemical  Society,  for  December  1903,  page 
1265)  2.65 


172 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


fl 

Hg^       _^_             _                                     m_ 

f"f~-                  ^~^                                     \ 

) 

1 

j^^-r^S 

^ 

^ 

lr 

1 

p 

I..S.CQ.      j 

f 

• 

VL        ^ 

mi 

*a!sy 

No.  3396.              Nos.  3400-1.                Nos.  3404-5.              No.  3408.                 No.  3411. 

No.  3412. 

For  CRUCIBLES,  Platinum,  see  Platinum  Ware. 

3396. 

CRUCIBLES,  Plumbago  or  Black  Lead,  Dixon's,  without  covers. 

No.  0             00           000         0000           1 

2 

3 

Capacity  about,  fluid  ounces  1%            2348 

12 

16 

Height  outside,  inches  2            2^4          2%            3            3%          4% 

5% 

Diam.  at  top,  outside,  inches  1%          1%                         2%          3% 

3% 

4% 

Each   $0.65          .65           .65           .65           .80 

.92 

1.10 

No  ..  ...       4              5              6              7              8 

9 

10 

Capacity  about,  pints  1%          1%          2%          2y»            3 

31/) 

4 

Height  outside,  inches  5%            6            6%          6%          7% 

7% 

7  in/ 

Diam.  at  top,  outside,  inches  4%          4%          5%          5%          5% 

6 

gi^ 

Each  1.45         1.67         1.95         2.14         2.43         2.70 

3.00 

3397. 

COVERS  for  No.  3396. 

To  fit  Crucible,  No  0             00           000         0000           1 

2 

3 

Each  30          .30          .30          .30          .42 

.42 

.42 

To  fit  Crucible,  No  4              5              6              7              8 

9 

10 

Each  .42          .42          .50          .50          .50 

.50 

.50 

3400. 

CRUCIBLES,  Best  American  Porcelain,  high  form,  glazed  throughout,  without 

covers. 

No  000           00             0             1             2             3 

4 

5 

Capacity,   cc  5           10            15            30            57            95 

155 

280 

Diameter  at  top,  mm  26           30            35            41            52            62 

72 

87 

Height,   mm  19           25            27            35            43            50 

59 

72 

Each     09          .12           .15           .24           .30           .35 

.45 

.55 

3401. 

COVERS  for  Crucibles  No.  3400. 

No  000           00              0              1              2              3 

4 

5 

Diameter,  mm  32           35            42           47           59            73 

81 

95 

Each     05          .05           .05           .07           .09           .12 

.12 

.15 

3404. 

CRUCIBLES,  Best  American  Porcelain,  wide  form,  glazed  throughout,  without  covers. 

No  000        00          0          1          2 

3           4 

5 

Capacity,  cc  8         12         17         30         50 

90       145 

265 

Diameter  at  top,  mm  32         37         41         46         56 

67         81 

96 

Height,  mm  •.  19         21         25         29         36 

44         52 

65 

Each   12       .15       .18       .25       .34 

.43        .50 

.62 

3405. 

COVERS  for  Crucibles  No.  3404. 

No  000         00           0           1           2 

3           4 

5 

Diameter,  mm  39         44         47         52         65 

76         88 

107 

Each   05       .05       .07       .07       .08 

.12        .15 

.18 

3408. 

CRUCIBLE,  Caldwell's  Form,  Best  American  Porcelain,  with  removable  perforated  plate 

to  fit 

in  bottom.     Size  No.  3;  capacity,  25  cc.    Without  cover  

.55 

3409. 

COVER  only  for  No.  3408  

.07 

3410. 

PERFORATED  DISK  only  for  No.  3408  

.20 

PERFORATED  DISKS,  Platinum,  for  No.  3408  Crucibles,  see  Platinum  Ware. 

3411. 

CRUCIBLE,  Best  American  Porcelain,  Cylindrical  Shape,   glazed   throughout   except  on   outside- 

bottom  surface.     Diameter  of  rim,  30  mm;  height,  32  mm;  capacity,  15  cc  

.25 

3412. 

CRUCIBLES,  Gooch  Form,  Best  American  Porcelain,  glazed  throughout  except 

outside   bottom 

surface.     Perforations  about  >/.  mm  in  diameter.     Without  covers. 

No  2 

3 

4 

Capacity,  cc  10 

25 

35 

Diameter  at  top,  mm  27 

35 

40 

Diameter  at  bottom,  mm  18 

22 

25 

Height,  mm  30 

40 

43 

Each  30 

.40 

.45 

3413. 

COVERS  for  No.  3412. 

Diameter,  mm  35 

42 

47 

Bach  05 

.05 

.07 

CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  8.  A. 


173 


No.  3414. 


No.  3416. 


NOS.  3428-9. 


3414. 

CRUCIBLE,  Gooch,  for  Bitumen  in  Asphalt,  Best  American  Porcelain,  with 

large 

filtering  sur- 

face.     Height,  24  mm;  width  at  top,  45  mm;  width  at  bottom,  35  mm  

$0.50 

3416. 

CRUCIBLES,  Rose's,  of  unglazed  porcelain,  complete  with  perforated  cover 

and 

delivery  tube. 

Xo  

1 

2              3 

Capacitv,   cc  

15 

30            60 

Diameter  at  top,  mm  

30 

35            50 

Height,   mm  

38 

40            50 

Each   

.50 

.80           .90 

3417. 

COVERS  only  of  No.  3416. 

Xo  

1 

2              3 

Diameter,  mm  

38 

42            59 

Each   

.10 

.15           .20 

3418. 

CRUCIBLES  only  of  No.  3416. 

Xo  

1 

2              3 

Each    

.20 

.27           .30 

3419. 

DELIVERY  TUBES  only,  with  flange,  of  No.  3416. 

No  

1 

2              3 

Each    

.25 

.40           .50 

3422.     CRUCIBLES,  Transparent  Quartz,  of  tall,  narrow  (so-called  platinum)  shape,  'without  covers. 

No A  B  C  D  E  F  G  H 

Capacity,   ec 10  20  30  40  50  60  80  100 

Diameter  at  top,  mm          28  35  40  45  50  54  58  65 

Each 3.60  6.00          8.40         10.20         12.00         13.80         16.80          19.80 

3424.  CRUCIBLES,  Transparent  Quartz,  Gooch  Form,  same  diameter  as  No.  3422  and  with  7  holes  2  mm 

in  diameter  in  the  bottom.     Without  covers. 

No A              B              C  D  E  F  G  H 

Capacity,   cc 10              20              30  40  50  60  80  100 

Each 5.40           9.00         12.60  15.30  18.00  20.70  25.50  29.70 

3425.  CRUCIBLE  COVERS,  Transparent  Quartz,  for  Xos.  3422  and  3424  Crucibles. 

For  crucibles,  Xo A  B  C  D  E  F  G  H 

Each 1.20  1.80          2.40  2.70  3.00  3.30  3.60  3.90 

3426.  CRUCIBLE  COVERS,  Rose's,  Transparent  Quartz,  for  No.  3422  Crucibles,  with  delivery  tube. 


For  crucibles,  Xo. 
Each  .. 


3428.  CRUCIBLES,  Sand,  Dixon's  Assay,  round  form,  without  covers. 

Xo A  B  C 

Diameter  outside,  inches 1%  1%  2% 

Height  outside,  inches 2%  3  3% 

Each 10  .10  .10 

Per  100 5.50  6.50  7.00 

No J  K  L 

Diameter  outside,  inches 4%  4%  5% 

Height  outside,  inches 6%  7*4  8 

Each 50  .55  .75 

Per  100 40.00  45.00  64,00 

3429.  COVERS  for  No.  3428  Crucibles. 

No A  B  C            D            E 

Each 05  .06  .07          .07V2       .08 

Per  100 4.50  5.00  6.00        6.50        7.00 

No J  K  L           M            N 

Each  .              15  .20  .21           .22           .24 


A  B 

3.00  3.60 

Sizes  same  as  Battersea. 


D 

E 

F 

G 

H 

2% 

2% 

3 

3% 

3% 

4 

4% 

5 

5% 

5% 

.10 

.15 

.17 

.20 

.35 

8.00 

12.00 

13.00 

17.00 

30.00 

M 

N 

P 

Q 

B 

5% 

6% 

7 

7% 

8% 

8% 

9% 

10 

11 

12 

1.00 

1.25 

1.80 

2.50 

4.00 

80.00 

110.00 

160.00 

220.00 

350.00 

F 

.10 

8.50 

P 

.26 


G 

.12 
10.00 

Q 

.28 


H 
.14 

12.00 

R 

.30 


Per  100 13.50   16.50   18.00   19.00   20.00   21.00   24.00   25.00 


174 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  3432. 


No.  3440. 


3432. 


3433. 


3436. 


3438. 


3440. 


3446. 


3448. 


No.  3446. 


No.  3448. 


No.  3438. 


CRUCIBLES,  Opaque  Fused  Silica,  wide  form,  99.8%  SiO2.  May  be  subjected  continuously  to 
temperatures  up  to  1200°C.,  and  for  short  periods  to  much  higher  temperatures.  Not  affected 
by  rapid  changes  of  temperature,  nor  by  acids,  except  hydrofluoric,  and  above  400  degrees  C., 
phosphoric. 

No 000 

Diameter,  inches 

Height,  inches 

Capacity,  cc • 4 

Each  . .  


00 

1% 


10 
.75 


0 

1% 
1 

15 
.75 


1 
1% 


25 
.94 


2 

2% 

17/16 

40 

1.13 


3 

2% 

1% 

65 

1.57 


CRUCIBLE  COVERS,  Opaque  Fused  Silica. 

For   crucible,  No 000 

Diameter,  inches 1% 

Each    .  63 


00 
1% 
.63 


1 

2% 
.75 


2 

2% 
.94 


3 

2% 
1.13 


CRUCIBLE,  Opaque  Fused  Silica,  Caldwell  Form,  with  flanged  bottom  for  perforated  platinum  or 
porcelain  disk.  Diameter  at  top,  1%  inches;  height,  1%  inches 1.88 

PERFORATED  PORCELAIN  DISK  for  No.  3436,  see  No.  5366. 
CRUCIBLES,  Silver,  spun  from  pure  sheets,  with  cover. 

No A  B  C  D  E  F 

Capacity,  cc 20  30  50  75  100  150 

Diameter,  inches 1%  1%  1§4  2  2%  2% 

Height,  inches 1%  1%  2  2&  2y2  2% 

Approx.  weight,  grams 35  45  '60  80  100  150 

Each 3.75  4.80  6.30  8.40         10.80         15.75 

CRUCIBLES,  Skidmore's  Normal  School  Retort  and  Crucible,'  spun  of  thin  iron  enabling  it  to 
be  easily  brought  to  a  red  heat  in  the  flame  of  an  ordinary  burner.  Can  be  used  as  an  open 
or  closed  crucible,  or  retort.  Specially  adapted  for  use  in  making  oxygen,  in  oxidation  and 
reduction  experiments,  and  in  dry  or  steam  distillations. 

No A  B 

Capacity,   ounces 1%  6 

Each   1.05        1.65 

CRUCIBLE  HOLDER  for  use  with  any  ordinary  60  degree  funnel.  Especially  efficient,  as  the 
ring  covers  only  about  %  inch  of  the  unper  rim  of  the  crucible.  Can  be  used  with  Gooch,  Cald- 
well, Alundum  or  Johnson's  Clay  Crucibles.  Made  of  one  piece  of  soft  rubber. 

No A  B 

For  crucibles,  top  diameter,  mm 27  35 

Each    .  30  .35 


CRUCIBLE  HOLDER,  Bailey's,  of  rubber,  to  take  No. 
funnel,  as  shown.     Rubber  holder  only 


Gooch  crucible. 


C 
40 
.40 

For  use  with  a  2  inch 
.35 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  S.  A. 


175 


No.  3468. 


No.  3466. 


No.  3474, 


CRUSHING  AND  GRINDING  APPARATUS 

The  crushers,  grinders,  mills  and  pulverizers  listed  in  this  section  have  been  carefully  selected  to 
meet  every  requirement  of  the  experimental  and  testing  laboratory.  They  are  all  American  made  and 
have  been"  in  use  for  enough  years  under  varied  conditions  to  insure  their  serviceability  and  durability. 
In  describing  them,  the  attempt  has  been  made  in  every  case  to  state  the  particular  uses  for  which  they 
are  best  adapted,  based  on  the  experience  of  our  trade. 

We  wish  to  direct  especial  attention  to  the  Brann  line  of  crushers,  grinders  and  pulverizers,  of 
which  a  complete  line  is  carried  in  stock  for  immediate  delivery. 

3460.  CRUSHING  PLATE,  Bucking  Board,  of  chilled  iron,  with  rim,  for  powdering  ores,  rock,  ete. 
Complete  with  rubber  of  same  material  with  set-in  wooden  handle. 

No A  B 

Size,  inches   18x24  24x36 

Weight,  pounds 100  160 

Each $10.00  17.50 

3464.  CBUSHING  PLATE,  Bucking  Board,  of  hardest.  Chrome  Steel,  with  rubber  of  same  material  8x7 
inches,  weighing  30  pounds,  with  wooden  handle.  Faces  of  plate  and  rubber  are  machined. 
Metal  does  not  grind  off  into  sample.  Recommended  by  the  Chemist's  Committee  of  the  United 
States  Steel  Corporation.  Size,  18x24  inches;  weight,  120  pounds.  (See  Journal  of  Industrial 

&  Engineering  Chemistry,  Vol.  I,  No.  2,  for  February,  1909) 110.00 

3466.  CRUSHER,  Weatherhead's,  for  hand  operation,  for  crushing  and  pulverizing  at  one  operation. 
Can  be  used  for  any  material,  from  clay  to  pig  iron.  Cover  of  machine  is  designed  for  use  as 
small  hand  mortar,  using  eud  of  handle  as  pestle.  Diameter  of  crusher,  about  12  inches;  height, 

about  8  inches;  weight  complete,  100  pounds 25.00 

3468.  CRUSHER,  Braun  Simplex  Ore,  for  hand  operation,  for  crushing  small  samples  of  ore.  Fineness 
of  the  product  can  be  easily  controlled  by  turning  two  regulating  screws  provided  with  hand- 
wheels.  The  machine  can  be  easily  cleaned  by  removing  with  one  blow  of  a  hammer  a  wedge 
which  holds  the  stationary  jaw  in  place;  the  entire  operation  of  opening  and  closing  can  be 
completed  in  one  minute.  Crushing  plates  are  of  hardest  steel,  and  can  be  reversed  or  easily 
renewed  when  necessary.  Capacity,  100  pounds  of  ore  per  hour  reduced  to  *4  inch  and  smaller. 
Height  of  machine  over  all,  18  inches;  width,  15^  inches;  length,  20  inches;  size  of  jaws,  6x3 
inches';  opening  of  jaws,  2  inches;  diameter  of  wheels,  16  inches;  shipping  weight,  190  pounds. 

40.00 

CRUSHER,  Simplex  Ore,  same  as  No.  3468,  but  for  power  as  well  as  hand  operation.     Power  re- 
quired, l->  h.  p.;  speed,  200  revolutions  per  minute.     Shipping  weight,  197  pounds 45.00 

CRUSHER,  Simplex  Ore,  same  as  No.  3468,  but  with  tight  and  loose  pulleys  for  power.  .  .  .  57.00 
CRUSHER,  Chipmunk,  Improved  Type  VC,  for  power,  with  all  steel  frames,  rigidly  secured  together 
with  strong  studs.  Bearings  are  of  best  phosphor-bronze  which  can  be  taken  up  when  worn  or 
easily  renewed.  The  fineness  of  the  product  is  readily  controlled  by  the  hand  wheel  in  front. 
The  stationary  jaw  lifts  out  permitting  easy  and  thorough  cleaning  of  interior.  When  operating, 
the  vibratory  jaw  is  given  a  forward  and  downward  motion  at  lower  end  compelling  the  dis- 
charge of  the  crushed  material.  A  special  feature  of  this  machine  is  its  large  capacity  for  the 
size  of  the  jaws.  Dimensions:  length  over  all,  18  inches;  height,  19  inches;  width,  19  inches; 
size  of  jaws,  3x6  inches;  opening  of  jaws,  2Vjx3  inches;  dimensions  of  pulleys,  lGx21o  inches; 
speed,  400  revolutions  per  minute;  power  required  to  operate,  1  h.  p.;  capacity,  300^ to  400 
pounds  per  hour ;  shipping  weight,  235  pounds  74.00 


3470. 

3472. 
3474. 


176 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  II.  8.  A. 


No.  3482. 


No.  3488. 


No.  3492. 


3476.  CRUSHER,  Chipmunk  Improved  Type  VC,  same  as  No.  3474,  but  with  tight  and  loose  pulleys  for 
permanent  connection  to  line  shaft  or  motor.  Shipping  weight,  270  pounds $85.00 

3478.  CRUSHER,  Chipmunk  Improved  Type  WC,  of  similar  construction  to  No.  3474,  but  much  larger. 
Dimensions:  length  over  all,  22  inches;  height,  26  inches;  width,  22  inches;  size  of  jaws,  9x4 
inches;  opening  of  jaws,  2%x4  inches;  dimensions  of  pulleys,  20x3  inches;  speed,  400  revolu- 
tions per  minute;  power  required  to  operate,  2  h.  p.;  capacity,  1000  to  1500  pounds  per  hour; 
shipping  weight,  460  pounds 132.00 

3480.     CRUSHER,  Chipmunk  Improved  Type  WC,  same  as  No.  3478,  but  with  tight  and  loose  pulleys 

for  permanent  connection  to  line  shaft  or  motor.     Shipping  weight,  515  pounds 149.00 

Prices  on  renewal  parts  for  Simplex  and  Chipmunk  Crushers  quoted  upon  application. 

3482.  GRINDERS,  Braun  Sample,  for  Rock,  for  hand  operation.     A  laboratory  machine  which  will  pul- 

verize 4  ounces  of  hard  quartz  rock  to  60  mesh  in  two  minutes,  or  to  100  mesh  in  3  minutes.  All 
parts  such  as  gears,  are  enclosed,  making  machines  dust  proof,  eliminating  danger,  and  prevent- 
ing loss  of  any  material.  Bucket  is  readily  removed  and  revolving  plate  lowered  to  facilitate 
cleaning.  Dimensions:  height  over  all,  31  inches;  width,  21  inches;  diameter  of  hand  wheel, 
16  inches;  diameter  of  grinding  plates,  6  inches;  shipping  weight,  180  pounds.  Complete  with 
one  set  of  grinding  plates 70.00 

3483.  RENEWAL  PLATES  for  No.  3482 per  set     8.50 

3486.  GRINDER,  Braun  Sample,  for  Coal  and  Coke,  for  hand  operation.  Will  pulverize  2  pounds  of  coal 
to  20  mesh  in  one  minute,  or  2  ounces  to  80  mesh  in  five  minutes;  will  reduce  2  pounds  of  coke 
to  20  mesh  in  6  minutes,  or  2  ounces  to  80  mesh  in  7  minutes.  Shipping  weight,  180  pounds. 

Complete  with  one  set  of  grinding  plates 75.00 

Note: — This  machine  can  be  operated  by  power,  using  hand  wheel  as  pulley.     Power  required, 
%  h.  p.;  speed,  200  revolutions  per  minute. 

3488.  GRINDER,  Braun  Sample,  for  Coal  and  Coke,  for  power,  same  as  No.  3486,  but  fitted  with  tight 

and  loose  pulleys  for  permanent  installation.  Shipping  weight,  190  pounds.  Complete  with 
one  set  of  grinding  plates 85.00 

3489.  RENEWAL  PLATES  for  Nos.'  3486  and  3488 per  set     8.50 

3492.  GRINDER.   Braun  Sample,  for  Iron  Ore,  for  power,  with  special  7  inch  carbon  steel  grinding 

plates,  with  low  phosphorus  content.  A  high  speed  machine  for  power  only;  will  pulverize  1 
pound  of  iron  ore  to  100  mesh  in  1%  minutes.  Equipped  with  special  bearings, .heavy  balance 
wheel  and  tight  and  loose  pulleys.  Dimensions:  length  over  all,  24  inches;  width,  16  inches; 
height,  31  inches;  dimensions  of  pulleys,  7V£x2%  inches;  speed  of  pulle3Ts,  600*revolutions  per 
minute;  speed  of  grinding  plates,  960  revolutions  per  minute;  shipping  weight,  290  pounds. 
Power  required  to  operate,  1  h.  p.  Complete  with  one  set  of  grinding  plates 133.00 

3493.  RENEWAL  PLATES  for  No.  3492,  of  carbon  steel per  set     23.00 

3496.  GRINDER,  Braun  Sample,  for  Iron  Ore,  for  power,  similar  to  No.  3492,  but  smaller  and  of  lighter 

construction.  Designed  for  intermittent  use.  Grinding  plates,  6  inches  in  diameter,  of  special 
carbon  steel,  mounted  vertically.  Equipped  with  enclosed  machine  cut  gears,  and  tight  and 
loose  pulleys,  12x2  inches.  Dimensions:  height  over  all,  31 'inches;  width,  24  inches;  shipping 
weight,  190  pounds.  Speed  of  pulleys,  500  r.  p.  m.;  of  grinding  plates,  800  r.  p.  m.  Power 
required  to  operate,  1  h.  p.  Complete  with  one  set  of  grinding  plates 95.00 

3497.  RENEWAL  PLATES  for  No.  3496 , per  set  20.50 

Note: — Prices  on  renewal  parts  for  any  of  the  preceding  Sample  Grinders  quoted  upon  application. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  S.  A. 


177 


No.  3512. 


No.  3516. 


3500. 


3502. 

3504. 
3508. 

3510. 


3512. 


3513. 
3516. 


GRINDER,  Laboratory  Ore,  with  Hardened  Steel  Mortar  and  Pestle,  for  power,  for  reducing  ore 
and  rocks  to  an  impalpable  powder.  The  pestle  is  attached  to  a  sliding  rod  held  down  by  a 
spring  at  the  top,  so  as  to  produce  constant  pressure  on  the  mortar,  which  revolves  slowly  in 
the  same  direction  as  the  pestle,  producing  a  combined  rolling  and  sliding  motion  similar  to 
that  in  hand  grinding.  A  scraper  operates  to  keep  the  ore  in  the  center  of  the  mortar.  By 
dropping  one  of  the  posts  on  the  platform  and  raising  the  pestle,  the  mortar  can  be  quickly 
removed.  The  machine  is  so  constructed  that  no  oil  or  foreign  substance  can  contaminate  the 
sample.  Height  of  machine,  18  inches;  diameter  of  mortar,  4*4  inches;  power  required  to  oper- 
ate, 14  h.  p.,  at  a  speed  of  250  r.  p.  m.;  shipping  weight,  40  pounds.  (For  complete  descrip- 
tion see  Bulletin  422,  of  the  United  States  Geological  Survey,  "The  Analysis  of  Silicate  and 
Carbonate  Rock,"  by  W.  F.  Hillebrand,  page  55)  .....................  .'  ............  $80.00 

GRINDER,  Hance  Conical  Plate  No.  1,  for  hand  operation,  for  grinding  dry  materials,  such  as 
drugs,  grains,  feed,  coal,  etc.,  to  any  degree  of  fineness  down  to  30  mesh.  Grinder  only  for 
bolting  to  table,  with  22-inch  fly-wheel  for  hand  power  .............................  50.00 

GRINDER.  Hance  Conical  Plate  No.  1,  same  as  No.  3502,  but  equipped  with  10x3  inch  tight  and 
loose  pulleys  for  power  ............................................................  50.00 

GRINDER,  Hance  Conical  Plate  No.  2,  for  power,  similar  in  construction  to  No.  3502,  but  much 
larger,  with  14-inch  grinding  plates:  mounted  on  substantial  wooden  support.  Height  over 
all,  48  inches;  floor  space,  18x31  inches;  speed,  200  r.  p.  m.;  power  required  to  operate,  5  h.  p.; 
size  of  pulleys,  12x4  inches;  shipping  weight,  385  pounds  ............................  125.00 

GRINDING  MILLS,  Laboratory  and  Drug,  for  hand,  operation,  for  grinding  herbs,  roots,  grains, 
feed  and  other  drv  substances. 
Xo  ...........  ." 

Height,   inches 
Diam.  of  wheels,  inches 
Weight,   pounds 
Each 

GRINDING  MILL,  for  hand  operation,  for  bolting  fb  table  or  bench.  For  pulverizing  hard  sub- 
stances for  analysis,  such  as  ores,  bone,  etc.  Grinding  surfaces  are  made  of  very  hard  mate- 
rial. Diameter  of  hand  wheel,  19%  inches;  weight  complete,  25  pounds  ...............  17.70 

EXTRA  GRINDING  PLATES  for  No.  3512  ...................................  per  set      4.00 

GRINDING  AND  PULVERIZING  MILL,  for  hand  operation,  for  soils,  grains,  dry  bone,  lime- 
stone, rock  phosphate,  etc.  Compact,  strong,  and  durable.  Height,  11  inches:  length.  12 
inches;  width,  9  inches;  dimensions  of  throat,  3x2  inches;  diameter  of  handwheel,  19  inches; 
weight  complete,  47%  pounds  ......................................................  10.00 


8% 
15 
6.30 


3 

15 

10% 
22% 
9.40 


5 
17 

12% 
36 

13.70 


17 

62 

18.80 


178 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


3518. 
3520. 
3522. 


No.  3534. 


No.  3536. 


GRINDING  AND  PULVERIZING  MILL,  for  power,  same  as  No.  3516,  but  fitted  with  single 

pulley,  12x3  inches $15.00 

GRINDING  AND  PULVERIZING  MILL,  for  power,  same  as  No.  3516,  but  with  tight  and 

loose  pulleys,  12x3  inches 20.00 

GRINDING  AND  PULVERIZING  MILL,  Nixtamal,  for  hand  operation,  for  soils,  herbs,  grains, 
coal,  dry  bone,  limestone,  etc.  Will  pulverize  limestone  fine  enough  to  pass  through  a  100 
mesh  sieve.  Capacity  (grain)  5  pounds  per  minute.  Total  weight,  24  pounds.  Complete  with 
three  sets  of  grinding  disks,  coarse,  medium  and  fine 17.50 

3524.  GRINDING  AND  PULVERIZING  MILL,  for  power,  similar  to  No.  3522  but  larger,  with  hop- 
per, and  for  power  drive.  Height,  24  inches;  length,  12  inches;  dimensions  of  pulley,  12x2% 
inches;  speed  of  pulley,  300  r.  p.  m.;  power  required  to  operate,  2  to  3  h.  p.;  capacity  per  hour 
(cereals),  240  to  500  pounds;  weight,  65%  pounds 50.00 

3526.  GRINDING  AND  PULVERIZING  MILL,  for  power,  with  automatic  feed,  adapted  for  grinding 
soils,  coals,  sand,  gravel,  stones,  grit,  cereals,  etc.  Will  take  large  material  and  run  either  way, 
to  right  or  left.  The  automatic  feed  is  used  for  small  material,  while  large  pieces  are  fed 
directly  into  the  mill.  Height,  46  inches;  height  from  floor  to  shaft,  24  inches;  floor  space, 
23x30  inches;  length  over  all,  36  inches;  speed,  500  to  1000  r.  p.  m.;  power  required,  2  to  3 
h.  p.;  dimensions  of  pulley,  8x4  inches;  weight,  300  pounds;  capacity  per  hour,  300  to  400 
pounds  76.00 

3528.  GRINDING  AND  PULVERIZING  MILL,  for  hand  operation,  specially  designed  for  grinding 
small  samples  of  wheat  for  flour  analysis.  Can  also  be  used  for  coal,  ore,  grains,  etc.  Burrs 
are  made  of  special  hard  steel  alloy.  Adjustable  for  different  degrees  of  fineness.  Parts 
can  be  easily  taken  apart  for  cleaning.  For  hand  power,  with  crank  handle  of  rolled  steel, 
9  inches  in  length.  Shipping  weight,  10  pounds  7.00 

3530.  GRINDING  AND  PULVERIZING  MILL,  for  hand  or  power,  same  as  No.  3528,  but  with  hand- 
wheel,  which  can  also  be  used  for  pulley.  Flexible  connection  between  hand-wheel  and  mill 
permits  easy  release  of  mill  for  thorough  cleaning.  Shipping  weight,  about  20  pounds  11.50 

3532.  GRINDING  AND  PULVERIZING  MILL,  for  hand  or  power,  same  as  No.  3530,  but  with  a 
bolter  which  oscillates  under  outlet  to  separate  ground  material  into  two  grades.  With  two 
interchangeable  bolter  boxes,  each  having  a  different  grade  of  cloth.  Shipping  weight,  about 
25  pounds  21.50 

3534.  GRINDING  AND  PULVERIZING  MILL,  for  power,  same  as  No.  3532,  but  without  handle, 
taking  a  1  inch  belt i 21.50 

3536.  GRINDING  AND   PULVERIZING  MILLS,  for  power,  same  as  No.  3534,  but  mounted  on  pedes- 

tal base  with  motor,  for  bolting  directly  to  floor.    Can  be  connected  to  any  incandescent  lamp 
socket.     Shipping  weight,  75  pounds.     Complete  with  two  bolter  boxes. 

No A  B  C  D 

A.C.  B.C. 

For  volts 110  220  110  220 

Each 60.00         63.00         55.00         58.00 

3537.  EXTRA  BOLTER  BOXES  for  Nos.  3532,  3534,   and  3536 each        .80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  S.  A. 


179 


No.  3552. 


No.  3554. 


3540.  GRINDING  MILL,  Enterprise  No.  O,  for  hand  power,  recommended  by  the  Joint  Enbber  Insula- 
tion Committee,  for  grinding  samples  of  rubber  and  insulating  compounds  for  analysis.  (See 
Journal  of  Industrial  and  Engineering  Chemistry,  Vol.  IX,  No.  3,  for  March  1917,  page 
313) $2.50 

3342.  MTIiT.,  Bagassee  Cutter,  for  hand  operation,  for  cutting  slices  from  bagassee  and  other  fibrous 
material  for  analysis.  The  thickness  of  the  slices  can  be  controlled  by  a  special  regulating 
device  from  thinnest  shavings  to  slices  %  inch  thick.  With  automatic  feed 10.00 

3544.  MTT.T.  Single  Specimen  Ball,  for  power,  for  pulverizing  small  samples  of  any  material.  Consist- 
ing of  a  porcelain  jar  with  flint  pebbles,  mounted  as  shown  with  9x1  inch  pulley  for  power 
drive.  Size  of  jar  outside,  5.2x5.7  inches;  floor  space,  9x11  inches;  speed,  80  to  120  r.  p.  m.; 
shipping  weight,  50  pounds;  capacity  dry,  *4  ounce  to  1%  pounds  at  a  charge;  capacity  wet, 
1'4  gallon  15.00 

3546.  'MTT.T.   Double  Specimen  Ball,  same  as  No.  3544,  but  with  two  jars  mounted  to  revolve  on  same 

axis.     Floor  space,  9x18  inches;  shipping  weight,  75  pounds 22.50 

3547.  EXTEA  PORCELAIN  JARS  for  Mills  Nos.  3544  and  3546,  size  5.2x5.7  inches;  capacity,  1  quart 

each     5.00 

3550.  MTT.T.  Single  Bacilli,  for  power,  with  jars  of  special  design  for  handling  tubercle  and  other 
bacilli.  Size  of  jar,  5.75x6.5  inches;  size  of  pulley,  9x1  inch;  floor  space,  9x11  inches;  speed, 
80  to  120  r.  p.  m.;  shipping  weight,  65  pounds;  capacity  dry,  %  ounce  to  2  pounds  at  a  charge; 
capacity  wet,  i£  gallon 18.00 

3552.  "MTT.T.  Double  Bacilli,  same  as  No.  3550,  but  with  two  jars  mounted  to  revolve  on  same  axis. 
Floor  space,  9x18  inches;  shipping  weight,  90  pounds 27.00 

3554.  'MTT.T.  Single  Assay,  for  hand  or  power,  for  reducing  to  an  impalpable  powder  any  materials, 
either  hard  or  soft,  particularly  those  which  must  not  come  in  contact  with  metals.  Widely 
•used  in  assay,  cement,  and  soils  laboratories.  Size  of  jar,  8.75x9.65  inches;  height  of  mill,  19 
inches;  floor  space,  14x25  inches;  size  of  pulleys,  9x1  inches;  speed,  60  to  75  r.  p.  m.;  shipping 
weight,  125  pounds;  capacity  dry,  1  ounce  to  5  pounds  at  a  charge;  capacity  wet,  1  gallon.  With 
handle  for  hand  operation 37.50 


180 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  3556. 


No.  3562. 


No.  3564. 


No.  3558. 


3556.  MILL,  Single  Assay,  with  Specimen  Jar,  for  hand  or  power.  Size  of  assay  jar,  8.75x9.65  inches; 
size  of  specimen  jar,  5.2x5.7  inches;  floor  space,  14x35  inches;  height,  19  inches;  size  of  pulley, 
9x1  inches;  shipping  weight,  140  pounds;  speed,  60  to  75  r.  p.  m.;  capacity  of  assay  jar,  dry, 
1  ounce  to  5  pounds;  wet,  1  gallon;  capacity  of  specimen  jar,  dry,  14  ounce  to  1%  pounds;  we't, 
i/4  gallon.  With  handle  for  hand  operation $48.75 

3558.  MILL,  Double  Assay,  for  hand  or  power,  same  as  No.  3554,  with  two  porcelain  jars,  8.75x9.65, 

mounted  to  revolve  on  same  axis.     Floor  space,   14x35   inches;    shipping   weight,   200   pounds. 
With  pulley  9x1  inch  for  power,  provided  with  handle  for  hand  operation 67.50 

3559.  EXTRA  PORCELAIN  JARS,  8.75x9.65  inches,  with  capacity  of  1  gallon.     For  Mills  Nos.  3554 

to  3558  each  10.50 

3560.  EXTRA  PORCELAIN  BALLS  for  Mills  Nos.  3544  to  3558. 

Diameter,  inches y2  %  1 

Per  pound 60  .60  .50 

3562.  MILL,  Swift  B  Drug,  for  hand  operation,  easily  adjusted  to  any  degree  of  fine  grinding;  can  be 
opened,  cleaned  and  closed  in  10  seconds  without  changing  degree  of  fineness  as  adjusted.  Can 
be  used  for  a  variety  of  materials,  such  as  feed,  cereals,  roots,  herbs,  soils,  etc.  Capacity  of 
hopper,  3  pounds;  floor  space,  24x24  inches;  height  over  all,  30  inches;  diameter  of  grinders, 
7%  inches;  diameter  of  fly-wheel,  34  inches;  weight  complete,  115  pounds 35.00 

3564.  MILL,  Grinding  and  Pulverizing,  for  power,  with  tight  and  loose  pulleys.  Can  be  regulated  to 
grind  coarse  or  fine  while  running.  Adapted  for  grinding  leather  samples,  cotton  seed,  cereals, 
feed,  etc.  Height,  20  inches;  length,  15  inches;  speed,  250  r.  p.  m.;  power  to  operate,  %  h.  p.; 
capacity  of  hopper  dry,  5  pounds;  capacity  of  grinder,  i/j  pound  per  minute;  shipping  weight, 
73  pounds 30.00 

3566.  MILL,  Rolling,  Crown,  for  assay  and  dental  laboratories.  Eolls  are  of  crucible  steel,  ground 
and  polished;  pinions  are  cut  from  steel  bar.  Eolls  can  be  easily  removed  from  frame.  Di- 
mensions of  rolls:  diameter,  2  inches;  length,  3  inches.  Shipping  weight,  54  pounds;  dimen- 
sions of  box,  18x11x8  inches 33.00 

3568.  MILL,  Rolling,  Crown,  same  as  No.  3566,  but  mounted  on  heavy  iron  column.  Dimensions  over 
all,  49x17x17  inches;  shipping  weight,  150  pounds 41.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


181 


No.  3600. 


No.  3602. 


No.  3604. 


No.  3608. 


3570.  TVTTT.T.,  Sugar  Cane,  for  extracting  the  juice  from  cane  or  other  plant  materials.  With  2  rolls, 
4x4  inches;  with  single  gearing  for  hand  power.  Capacity,  125  pounds  of  cane  per  hour.. .  $50.00 

3572.  MTT.T.,  Beet  Shredding,  with  knives  and  plates  of  steel.  External  parts  tinned  to  prevent  rust- 
ing. Easily  taken  apart  for  cleaning.  Capacity,  4  ounces  per  minute.  Weight,  18  ounces. .  1.75 

3578.  PULVERIZER,  Braun,  Type  IT.  A.,  with  tight  and  loose  pulleys  for  power  use.     The  grinding 

plates  are  made  of  special  alloy  possessing  a  high  degree  of  wearing  quality  and  durability. 
They  are  specially  designed  to  secure  best  possible  service,  and  can  be  easily  replaced.  The 
large  and  small  lugs  (shown  in  the  illustration)  act  as  breakers  and  carriers  while  the  outer 
surfaces  effect  the  pulverizing.  The  grinding  plates  are  held  in  place  in  such  a  way  that  no 
screw  heads  or  bolt  heads  protrude,  and  can  be  quickly  and  easily  removed.  The  machine 
opens  up  so  that  every  particle  of  material  can  be  brushed  into  the  pan.  The  interior  is 
smooth  finished  with  all  parts  easily  accessible  for  cleaning.  The  pulverizer  is  fed  through 
a  spout  in  the  door  and  will  take  particles  up  to  %  mesh  and  reduce  to  100  mesh  at  one  grind- 
ing. Length  of  machine,  23  inches;  width,  14  inches;  height,  14%  inches;  size  of  pulleys, 
9x2%  inches;  speed,  850  r.  p.  m.;  power  required  to  operate,  1  h.  p.;  shipping  weight,  275 
pounds;  capacity  (quartz  ore),  1  pound  to  100  mesh  in  1  minute 108.00 

3579.  EXTRA  GRINDING  PLATES  for  Braun  Pulverizer per  set      8.50 

For  SAMPLERS,  RIFFLE  PLATES,  etc.,  see  Sampling  Apparatus. 

3590.  CULTURE  DISHES,  Petri  Plates,  in  pairs,  of  clear  glass  with  thin  flat  bottoms,  well  annealed 
to  withstand  sterilizing. 

No A          B          C          D          E          F          G 

Diameter  of  upper  dish,  mm 50         75         90       100       100       120       150 

Depth,    mm 10          10          10          10          15          20          20 

Per  pair .23        .23        .26        .28        .28        .50        .64 

3592.  COVER,  of  Porous  Earthenware,  for  culture  dishes  100  mm  in  diameter,  to  prevent  spreading  of 
growth  by  water  of  condensation  during  incubation 20 

3594.     COVER,  of  Porous  Earthenware,  same  as  Xo.  3592,  but  glazed 25 

3600.     CULTURE  DISHES,  Moist  Chambers,  made  of  clear  white  glass,  with  cover. 

No A  B 

Diam.  of  upper  dish,  mm 198  240 

Depth  of  lower  dish,  mm 70  80 

Each    2.25  2.50 

3602.  CULTURE  DISH  HOLDERS,  Ravenel,  of  nickel-plated  spring  wire,  to  hold  dishes  100  mm  in 
diameter  for  incubation  or  sterilization. 

No A  B 

To  hold,  dishes 3  6 

Each    50  .60 

3604.  CULTURE  DISH  HOLDER,  for  100  mm  dishes,  of  polished  copper,  with  inside  tray  for  removing 

dishes.     Size,  9  inches  high  by  4%  inches  in  diameter 3.25 

3605.  CULTURE  DISH  HOLDER,  same  as  No.  3604,  but  made  of  sheet  iron 1.80 

3608.     CULTURE  DISH  HOLDER,  for  100  mm  dishes,   round   form,  of   polished    copper,   nickel-plated, 

with  five  shelves,  door  and  handle.    Size,  8x5  inches 9.00 


182 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  3644. 
No.  3640. 

3616.     CULTURE  FLASKS,  Kollc,  of  Pyrex  glass,  with  neek  indentation  to  prevent  the  culture  medium 
from  flowing  out.     Extensively  used  in  the  preparation  of  typhoid  vaccine.     Capacity,  320  cc; 

number  in  original  ease,  84 each  $0.75 

per  dozen  in  original  case     8.10 

3618.     CULTURE  FLASK,  Freudenreich's,  with  ground  on  cap.     Capacity,  25  cc 55 

3620.     CULTURE  FLASK,  Freudenreich's,  same  as  No.  3618,  but  with  side"  tube 75 

3622.     CULTURE  FLASKS,  Miquel,  with  flat  bottom  and  ground  on  cap. 

Capacity,  cc 50  75 

Each 1.00  1.25 

CULTURE  SLIDES,  see  Microscope  Accessories. 
CULTURE  TUBES,  see  No.  13358  Test  Tubes. 
3628.     CUPELS,  Bone  Ash,  highly  absorbent. 

Diameter,  inches 1%  1%  1% 

Per  dozen 45  .55  .60 

Per  100 3  00  3.75  4.25 

3630.     CUPELS,  Casite,  extremely  hard  when  cold,  standing    transportation   without    damage.      When 
heated  they  become  soft  and  as  absorbent  as  the  best  bone  ash. 

Diameter,  inches ~: l1^  1%  •  1% 

Per  dozen 25  .35  .40 

Per  100 1.65  2.50  2.75 

CUPEL  HOLDER,  see  Blowpipe  Apparatus. 

3634.     CUPEL  RAKE,  of  iron,  24  inches  long — '.'. 60 

3636.     CUPEL  SHOVEL,  of  iron,  24  inches  long 60 

3638.     CUPEL  MOLDS,  of  brass,  finely  finished. 

Diameter,  inches l1^  1%  1% 

Each 1.75  2.00  2.25 

3640.     CUPEL  MOLDING-  MACHINE,  Iler's,  with  foot  pedal  for  securing  pressures,  leaving  both  hands 
free.     Capacity,  500  cupels  per  hour.     Shipping  weight,  40  pounds.     For  both  I1/!  and  IVi  inch 

cupels    ." i 30.00 

3642.     CUPEL  MOLDING-  MACHINE,  same  as  No.  3640,  but  equipped  for  making  1^4 ,  1%,  1%   and 

2  inch  cupels 40.00 

3644.     CUPEL  TRAY,  of  -iron,  with  detachable  handle,  for  16  cupels 1.00 

CUPS,  Annealing,  see  Annealing  Cups. 

CUPS,  Porous,  for  use  with  batteries,  see  Batteries. 

CUPS,  Swimming,  see  Swimming  Cups. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


183 


No.  3650. 


Nos.  3652-4. 


No.  3656. 


No.  3658. 


No.  3660.         No.  3662. 


No.  3664. 


3650. 

3652. 

3654. 

'  3656. 

3658. 
3660. 

3662. 
3664. 


3668. 
3670. 


3672. 
3674. 


CYLINDERS,  Hydrometer  Jars,  of  heavy  glass,  with  lip. 

Size B           C  D  E  P 

Height,  inches 6             8  10  12  15 

Diameter,  inches  1%        1%  1%-  2  2 

Each *0.30          .36  .40  .50  .65 

CYLINDERS,  Hydrometer  Jars,  of  heavy  glass,  with  flange. 

Size B           C  D  E  F 

Height,  inches 6             8  10  12  15 

Diameter,  inches 1%        1%  1%  2  2 

Each 30          .36  .40  .50  .65 


CYLINDERS,  Hydrometer  Jars,  of  heavy  glass,  with  flange  ground  to  take  glass  plate. 

Size BCD  E  F  G 

Height,  inches 6  8  10  12  15  15 

Diameter,  inches 1%        1%         1%  223 

Each   35          .40          .45  .55          .75      1.05 

CYLINDERS,  Hydrometer  Jars,  with  enlarg?d  top  to  prevent  overflow. 

Size A  B 

Height,  inches 12  14 

Diameter  of  body,  inches 1%  1% 

Each  '. 70  .80 

CYLINDERS,  Graduated,  with  double  graduations  to  read  up  and  down,  with  lip. 

Capacity,   cc 5       10        25        50  100  200  250      500    1000 

Graduated   in,   cc Mo      Mo        %        %  !  2  2          5        1° 

Each 35      .40       .50       .60  .70  1.00  LIO     1.50     2.00 

CYLINDERS,  Graduated,  Mixing  Bottles,  with  glass  stopper, 
up  and  down. 

Capacity,    cc 10        25        50  100  200  250 

Graduated  in,  cc Mo        %        %  1  2  2 

Each    70      .90    1.10  1.20  1.50  1.65 


G  H 

15  18 

3  3 

.95  1.50 

G  H 

15  18 

3  3 

.95  1.50 

H 

18 

3 

1.75 

C 

16 

.90* 

2000 
10 
4.00 

With  double  graduations  to  read 


CYLINDER,  Graduated,  for  use  with  No.  7360  Brown-Duvel  Moisture  Tester. 


500    1000    2000 
5        10        10 
2.60     3.00     6.00 

Graduated  to  2? 
.65 


CYLINDER,  Graduated,  new  design  with  enlarged  top,  for  use  with  No.  7360  Brown-Duvel  Mois- 
ture  Tester.     Reads   directly  in  percentage   of   moisture   up   to   16  per   cent.,  when   50   gram 
sample  is  used.     (See  Bulletin  56  of  the  United  States  Department  of  Agriculture)  ......  85 

CYLINDERS,  Graduated,  decision  or  Normal,  with  single  graduations,  to  meet  the  requirements 
of  United  States  Bureau  of  Standards.     With  unofficial  factory  certificate. 

Capacity,  cc  .........................       10  25  50  100          250          500        1000 

Graduated  in,  cc  .....................     Mo  ui  %  1  2  5  10 

Each    ..................................     1.50        2.30         2.60         2.30         3.40        3.75         5.30 

Each  with  Bureau  of  Standards  Certificate.  3.50        4.30        4.60        4.30        5.40        6.00        7.30 
CYLINDERS,  Graduated,  Mixing  Bottles,  Precision  or  Normal,  glass  stoppered,  with  single  grad- 
uations, to  meet  the  requirements  of  the  United  States  Bureau  of  Standards.     With  unofficial 
factory  certificate. 

Capacity,  cc  .........................      10  25  50  100          250          500        1000 

Graduated  in,  ce  .....................      Mo          %  %  1  2  5-10 

Each   ....................................  1.80        2.60         2.90         2.60         3.70         4.05         5.60 

Each  with  Bureau  of  Standards  Certificate.  3.80        4.60        4.90        4.60        5.70        6.75        7.60 
GRADUATES,  Conical,  etc.,  see  Graduates. 
CYLINDERS,  Urinometer,   see  Urinometers. 


184 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  3754-6. 


Nos.  3750-1. 


No.  3784. 


No.  3776. 


No.  3780. 


3750.  DEFLAGRATION  GLOBE  for  combustions  in  oxygen.     Diameter  of  globe,  9  inches;  diameter  of 

opening,  2  inches.     Globe  only $1.70 

3751.  SUPPORT  and  Cup  for  No.  3750 1.30 

3754.    DEFLAGRATION  SPOON,  of  iron,  with  %  inch  cup.     Length  over  all,  15  inches 07 

3756.    DEFLAGRATION  SPOON,  of  brass,  with  %  inch  cup.     Length  over  all,  15  inches 10 

3758.    DEFLAGRATION  AND  COMBUSTION  SPOON,  Parker's,  with  removable  %  inch  cup  which  can 

be  placed  at  one  end  for  combustion  and  at  the  other  for  use  in  deflagrations.     Total  length, 

about   15  inches 15 

DEFLAGRATION  Spoons  for  Sodium,  see  Spoons. 

DESICCATORS 

3770.   DESICCATORS,  Scheibler,  with  wide  flanges  and  covers  finely  ground  to  fit. 

Diameter,  inches 4  5  fi  8  10 

Each 1.10  1.50  1.80  5.50  9.50 

3772.     DESICCATORS,  Scheibler,  for  vacuum,  same  as  No.  3770,  but  with  tubulature  in  cover  to  take 
rubber  stopper. 

Diameter  inside,  inches 6  8  10 

Each 3.10  6.60          11.00 

3774.     DESICCATORS,  Scheibler,  same  as  No.  3772,  but  complete  with  rubber  stopper,  glass  stop-cock, 
and  desiccator  plate  with  26  mm  holes. 

Diameter  inside,  inches 6  8  10 

Each. 6.50  10.50          16.00 

3776.    DESICCATORS,  Scheibler,  same  as  No.  3772,   but   with   glass   stop-cock  and   hook   ground  in 
tubulature  in  cover. 

Diameter  inside,  inches 6  8  10 

Each 6.50  10.00          14.50 

l!778.     DESICCATOR,  Atwater,  with  triangle.     Diameter  inside,  about  4  inches 3.50 

JJ780.     DESICCATORS,  Fruehling  and  Schultz,  with   porcelain   plate  profusely   perforated  with   small 
holes. 

Diameter  inside,  inches 8  10 

Each 10.00  14  00 

3782.    DESICCATORS,  Fruehling  and  Schultz,  same  as  No.  3780,  but  with  glass  stop-cock  and  hook 
ground  in  cover. 

Diameter  inside,  inches 8  10 

Each 14.00  18.00 

3784.     DESICCATORS,  consisting  of  a  bell  jar  ground  to  fit  tightly  upon  a  heavy  glass  plate.     A  porce- 
lain dish  is  supplied  for  containing  the  drying  agent,  and  for  holding  dishes  and  crucibles. 

No A  B 

Diameter  of  bell  jar,  cm 15  20 

Diameter  of  porcelain  dish,  cm 12  14.5 

Glass  plate,  cm  square 20  25 

Each 3.25  4.70 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


185 


No.  3796.  No.  814. 


No.  3802. 


No.  3785. 


No.  3804. 


No.  3808.     No.  3814. 


No.  3790. 


3785.     DESICCATOR  DISHES,  Acid  Dishes  only  of  No.  3784,  of  porcelain. 

Diameter,  cm 12  14.5 

Each $0.80          1.10 

814.     DESICCATOR,  Triangular,  for  use  in  corner  of  balance  case;   of  glass,  2  inches  on  a  side,   1% 

inches  high    1.00 

3790.  DESICCATOR  CABINET,  of  glass,  with  wood  frame  carefully  constructed  to  provide  an  airtight 
enclosure.  Complete  with  three  removable  perforated  steel  trays.  Finished  in  white  enamel 
with  nickeled  trimmings.  Dimensions  inside:  length,  12%  inches;  height,  10%  inches;  depth, 

7ys  inches 8.00 

3794.     DESICCATOR  PLATES,  of  aluminum,  with  7  holes,  each  26  mm  in  diameter. 

Diameter,  inches 4%  5^  7% 

To  fit  desiccator,  inches 5  6  8 

Each 1.25  1.25  1.80 

3796.    DESICCATOR  PLATES,  porcelain,  glazed  on  one  side,  with  three  small  feet  and  with  holes  26  mm 
in  diameter;  intended  for  use  in  Scheibler  Desiccators. 

No 1  2  3  4  5 

Diameter,  mm 95  115  140  190  240 

Diameter,  approximate,  inches 3%  4%  5%  7^  9% 

Number  of  holes 3  4  5  6  8 

Each 80  1.00  1.25  1.90  2.40 

3798.  DESICCATOR  PLATES,  glazed  porcelain,  with  three  small  feet  and  with  seven  holes,  each  26  mm 
in  diameter. 

Diameter,  inches    4% 

Each   1.00 

3800.     DESICCATOR  PLATES,  glazed  porcelain,  without  feet;  with  holes  30  mm  in  diameter. 

Diameter,  mm 190 

Diameter,  approximate,  inches 7% 

Number  of  holes 7 

Each   2.00 

3802.     DESICCATOR  PLATES,  glazed  porcelain,  profusely  perforated  with  small  holes. 

Diameter,  mm 140  190 

Each 1.25  2.00 

3804.  DESICCATOR  TRIPODS,  of  glass,  with  feet,  to  stand  inside  desiccators,  for  holding  dishes  and 
crucibles. 

No A  B  C 

For  desiccator,  diameter,  inches 4  5  6 

Each 50  .60  .65 

3808.  DIALYZER,  Bell  Glass  Form,  consisting  of  open  top  bell  glass,  with  large  end  covered  with 
parchment  paper,  suspended  in  glass  jar.  Diameter  of  bell  glass,  7.5  cm;  size  of  glass  jar, 

5x7  inches 1.50 

10040.  DIALYZER  PAPER,  Parchment,  of  vegetable  origin,  medium  thickness,  in  sheets  18x24  inches 

i per  sheet      .05 

per  quire      .60 

10042.  DIALYZER  PAPER,  Parchment,  genuine  animal  product  in  sheets  17x22  inches. .  .per  sheet    1.70 

3814.  DIAMOND  for  writing  on  glass,  mounted  in  hard  rubber  handle 2.50 

3815.  DIAMOND  for  writing  or  etching  on  glass,  with  high  grade,  sharp  diamond  point,  wooden  handle 

and  protecting  cap 3.50 

DIAMOND  GLASS  CUTTERS,  see  Glass  Cutters. 

3816.  DIAMOND  INK  for  writing  on  glass,  in  one  ounce  ceresine  bottles 40 

DIGESTERS,  see  Autoclaves. 


5% 
1.25 

230 

9 

8 
2.50 

230 
2.50 


186 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.   3820. 


No.  3822. 


No.  3828. 


No.  3830. 


3820. 
3822. 


3828. 


3830. 


3832. 


3834. 


3830. 


3842. 


No.  3832. 


No.  3834. 


No.   3836. 


DIES,  Figures,  of  steel,  from  0  to  9,  for  stamping  steel,  bullion,  etc. 

Face,  inches  %  %6  % 

Per  set $0.65  .90  1.50 

DIES,  Letters,  of  steel,  complete  set  from  A  to  Z,  and  period,  for  stamping  steel,  bullion,  etc. 

Face,  inches %  %$  % 

Per  set 2.00  2.70  4.50 

DISHES,  ALL  KINDS 

DISHES,  Acid,  see  No.  3785. 

DISHilS,  Aluminum,  for  milk  analysis,  see  No.  3850. 
DISHES,  Crystallizing,  of  thin  blown  glass,  with  flat  bottom,  straight  sides,  and  ground  edges. 

No A  B  C  D  E  F  G 

Approx.  diameter,  mm 50          80          100          125          150          190          250 

Approx.  depth,  mm 35          40  50  65  75  95  125 

Each 12         .15          .20  .36  .48  .80         1.85 

DISHES,  Culture,  see  Culture  Dishes. 

DISHES,  Evaporating,  Resistance  Glass,  flat  bottom,  heavy  walled,  with  lip;  may  be  used  instead 
of  porcelain. 

No A  B  C  D 

Diameter,  mm 60  80  105  125 

Approximate  capacity,  cc 50  100  200  400 

Each 18  .26  .40  .60 

DISHES,  Evaporating,  Best  American  Porcelain,  highest  quality,  with  lip,  glazed  inside  and  out- 
side up  to  No.  5;  larger  sizes  glazed  inside,  but  only  partly  outside. 

No 000        00          0  1  2  3  4  5  6 

Diameter,  mm 60    70    80     85    90    100    110   120    145 

Approximate  capacity,  cc 35    60    80    100    140    175    210   300    385 

Each 12   .18    .20    .30    .35    .40    .45    .55    .70 

No 6A    7     8     8A     9     10     11    12     13 

Diameter,  mm 162   185   215    230    265    305    360   400    460 

Approximate  capacity,  cc....  535   765   1285   1430   2200   3250   5700  10000  16500 

Each 80   .90   1.20   1.50   1.80   3.00   4.00   9.00   18.00 

DISHES,  Evaporating,  Best  American  Porcelain,  glazed  inside,  but  only  partly  outside,  with  heavy 

welted  rim  and  lip.     No 12  13 

Diameter,  mm 400  460 

Approximate  capacity,  cc 10000  16500 

Each 12.00  20.00 

DISHES,  Evaporating,  Best  American  Porcelain,  shallow  form,  with  lip,  glazed  inside  but  only 
partly  outside. 

No 

Diameter,  mm , . 

Height,  mm 

Approximate  capacity,  cc 


Each 


1 

70 

15 

45 

.20 


2 

80 

20 

60 

.25 


3 

95 
23 
95 
.40 


4 

105 
30 
160 

.50 


5 

120 
34 
200 

.60 


140 
40 

350 
.75 


DISHES,   Evaporating,    Opaque  Fused   Silica,  round  bottom,  glazed  throughout,  with  lip. 
affected  by  sudden  or  extreme  changes  of  temperature,  nor  by  ordinary  reagents. 

No A              B  C               D  E 

Diameter,  mm 51              70  82              89  9? 

Depth,  mm 21              25  30              22  30 

Approximate  capacity,  cc 25              45  80              90  100 

Each 1.25          1.45  1.57          1,70  2.00 


7 
160 

48 
550 

.90 
Not 


F 
108 

44 
200 
2.30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


187 


No.  3844 


No.  1820. 


No.  1821. 


No.  3856. 


No.  3858. 


3843.    DISHES,  Evaporating,  Transparent  Quartz,  hemispherical,  with  lip. 


3844. 

3846. 
3848. 


3850. 


2408. 


1820. 


No A               B               C              D               E  F 

Diameter,  mm 30              50              60             75             100  125 

Capacity,  ec 10              25              50            100            200  250 

Each $3.00           4.80          7.20         10.80         18.00  25.80 

DISHES,  Graniteware,  flat  bottom,  with  sloping  sides. 

No A              B  C 

Approx.  diameter,  cm 15              ig  22 

Manufacturer's  rated  capacity,  quarts %               1  2 

Each : 30            .35  .40 

DISHES,  Iron,  see  Sand  Baths. 
DISHES,  Lead,  for  use  with  hydrofluoric  acid  in  etching  glass. 

Diameter,  mm 50              75  100 

Each 09            .14  .20 

DISHES,  Lead,  Bottle  Caps,  for  moisture  in  milk.  Used  also  in  the  ether  extraction  of  confec- 
tionery, according  to  the  new  method  proposed  by  the  Association  of  Official  Agricultural 

Chemists.     (See  Journal  of  the  Asociation  of  Official  Agricultural  Chemists,  Vol.  II,  No.  1   Part 
II,  page  73.) 

No A                        B  C 

Size,  inches   2%x%             2%xl  %6  3%*% 

Per  100 2.50                   2.50  2.50 

DISHES,  Milk,  Aluminum,  with  straight  sides  and  flat  bottom. 

No A               B               C  D 

Diameter,  mm 50              65              75  100 

Depth,  mm ...  t 12              15              20  25 

Each 20            .30            .36  .40 

DISHES,  Milk,  Best  American  Porcelain,  with  straight  sides  and  flat  bottom,  glazed  inside  and 
outside. 

No 1                3  4 

Outside  diameter,  mm 45              69  72 

Depth,  mm 12              13  16 

Capacity,   cc 13              25  45 

Each 25             .35  .40 

DISHES,  Moisture,  Aluminum,  with  cover  of  same  fitting  outside.  Cover  can  be  fitted  on  bottom 
to  keep  parts  together  when  dish  is  open.  Extensively  used  in  soil  laboratories  for  determin- 
ing moisture. 

No A  B 


1821. 

3856. 
3858. 


Diameter,  mm 50  63 

Height,  mm 22  44 

Each 25  .30 

DISHES,  Moisture,  Aluminum,  same  as  No.  1820,  but  with  dish  and  cover  numbered  to  agree, 
ordering  please  state  what  numbers  are  desired. 

No A  B 

Each 30  .35 


C 
89 
50 
.50 

In 

C 
.55 


DISH,  Moisture,  Aluminum,  with  flat  bottom,  sloping  sides,  and  inverted  cover  fitting  tightly  on 
inside.     Diameter  at  top,  55  mm ;  height,  15  mm 50 

DISHES,  Nickel,  spun  from  pure  sheet,  polished;  round  bottom,  with  lip. 

No A  B  C  D 

Diameter,  mm 50  70  89  100 

Capacity,  cc 40  100  200  300 

Each 1.10  1.45  2.20  3.00 


188 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  3860. 


No.  3862. 


No.  3866. 


No.  3864. 


No.  3868. 


No.  3870. 


No.  3872. 


No.  3874. 


DISH,  Nickel.  Sugar,  see  No.  834. 
DISHES,  Platinum,  see  Platinum  Ware. 

3860.     DISHES,  Preparation,  of  clear  white  glass,  low  form,  with  loose  fitting  cover. 

No A 

Diameter,  mm 50 

Height,  mm 30 

Each $0.35 

3862.    DISHES,  Preparation,  Stender  Dishes,  with  grooved  covers  ground  to  fit. 

No A  B              C  D 

Diameter,  mm 36  50              60  60 

Height,  mm 19  25              28  89 

Each 14  "        .18            .25  .25 

3864.    DISHES,  Boasting,  Denver  Fire  Clay,  very  shallow. 

Diameter,  inches 3  4                  5  6 

Each 12  .15              .20  .30 

Per  dozen 1.20  1.50            1.75  2.75 

3866.     DISHES,  Silver,  spun  from  pure  sheet,  polished;  round  bottom  with  lip. 

No A                 B  C  D 

Diameter,  mm 50                70  89  100 

Capacity,  ec 40               100  200  300 

Weight  about,  grams 45                75  125  175 

Each 4.75            8.90  13.10  18.40 

3868.     DISH,  Staining,  of  glass,  with  cover  and  grooves  to  hold  ten  3  inch  slides.     Length  outside,  3% 
inches;  width  outside,  2%  inches 30 

3870.     DISH,  Staining,  Embryological  Cup,  of  solid  glass  with   concavity  in  center,  with   one  surface 
ground   for    writing.     Dimensions    38x38x17  mm,  with  concavity  33  mm  in  diameter  and  11  mm 

deep 08 

DISHES,  Staining,  Syracuse  Watch  Glasses,  see  Watch  Glasses. 
STAINING  JABS,  see  Jars,  Staining. 
DISHES,  Stender,  see  Dishes,  Preparation. 

3872.     DISH,  Sugar,  Opaque  Fused  Silica,  flat  bottom,  without  lip.     Diameter,  51  mm;  depth  in  center, 
25  mm ;  approximate  capacity,  40  cc 1.56 

3874.    DISH,  Tannin,  Opaque  Fused  Silica,  flat  bottom,  without  lip.    Used  also  for  ashing  coal.    Diam- 
eter, 82  mm;  depth  in  center,  25  mm;  approximate  capacity,  75  cc 1.56 

DISHES,  Weighing,  see  Balance  Weighing  Scoops. 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


189 


Nos.  3880-2. 


3880. 
3882. 

3884. 
3888. 
3890. 

3891. 
3894. 


3896. 
3898. 
3900. 
3902. 
3904. 
3906. 
3908. 

3910. 
3912. 

3914. 


No.  3900. 


No.  3906. 


No.  3904. 


No.  3912. 


DISSECTING  INSTRUMENTS 

BLOWPIPE  for  zoological  work,  nickel-plated,  125  mm  long $0-12 

BLOWPIPE  for  zoological  work,  nickel-plated,  188  mm  long  with  very  small  orifice;  especially 
suited  for  very  small  vessels .25 

BRISTLES,  shoemaker's.     Extra  quality;  useful  as  seekers  for  tracing  out  fine  ducts  and  vessels 
per  100      .20 

FOECEPS,  Artery,  Dressing  Forceps,  of  steel,   nickel-plated,    with    corrugated    jaws.      Length, 
11.1  mm 1.40 

FOECEPS,  Artery,  Dieffenbach's,  self-closing,   of   steel,   nickel-plated,  with   corrugated   curved 
jaws.     Length,  60  mm .85 

FOECEPS,  Artery,  Dieffenbach's,  same  as  No.  3890,  but  straight 85 

FOECEPS,   Bone   Cutting,   of  steel,  nickel-plated,  very  heavy  and  strong.      The  blades  fit  ac- 
•^curately  and  are  easily  separable  for  cleaning. 

Length,  mm '. 200  225 

Each 4.00  4.50 

FOECEPS,  Bone  Cutting,  of  steel,  nickel-plated,   with   strong  curved  blades.     Length,   125   mm 
1.50 

FOECEPS,  Dissecting,  Fine,  of  steel,  nickel-plated,  with  smooth  handles;  fine,  straight,  smooth- 
points.       Length,  110  mm 10 

FOECEPS,  Dissecting,  Fine,  of  steel,  nickel-plated,  with  smooth  handles;   fine  straight,  smooth 
points.     Length,   95   mm .25 

FOECEPS,  Dissecting,  Fine,  of  steel,  nickel-plated,  with   smooth  handles;    fine   curved,  file-cut 
points  and  guide  pin.     Length,  1 20  mm 50 

FOECEPS,  Dissecting,  Fine,  of  steel,  nickel-plated,  with  corrugated  handles;  fine,  straight,  file- 
cut  points,  with  guide  pin.     Length,  115  mm 55 

FOECEPS,  Dissecting,  Fine,  of  steel,  nickel-plated,  with  corrugated  handles;   fine,  curved,  file- 
cut   points,  with  guide  pin.     Length,  115  mm 65 

FOECEPS,  Dissecting,  Medium,  of  steel,  nickel-plated,   with    corrugated   handles;   medium   fine, 
straight,  corrugated  points,  with  guide  pin.     Length,  115  mm 55 

FOECEPS,  Dissecting,  Medium,  same  as  No.  3903,  but  with  curved  points.  .  Length,  110  mm       .60 

FOECEPS,  Dissecting,  Heavy,  of  steel,  nickel-plated,  with  corrugated  handles;  heavy,  straight, 
corrugated  points,  with  guide  pin.     Length,  115  mm 50 

FOECEPS,  Dissecting,  Heavy,  of  steel,  nickel-plated,   with   corrugated  handles;    heavy,   straight, 
file-cut  corrugated  points,  without  guide  pin.     Length,  125  mm 50 

FOECEPS,  Blowpipe,  Cover  Glass.  Pinning,  Weight,  etc.,  see  general  heading,  Forceps. 


190 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


ABC 
No.  3974.   No.  3951  (full  size). 


No.  3958. 


NO.  3926. 


No.       No.        Nos.       No.       No. 
3932.     3934.     3936-8.     3940.     3942. 


No.       No.       No. 
3944.     3946.     3948. 


3920.     HOOK  AND  CHAINS,  triple  hooks,  nickel-plated,  with  sharp  points $0.30 

3924.     KNIFE,  Cartilage,  all  steel,  nickel-plated,  corrugated  handle;  50  mm  cutting  edge.     Total  length, 

165  mm 80 

3926.    KNIVES,  Cartilage,  Heavy,  Prosecting  Knives,  with  heavy,  steel  blade,  extra  thick  at  back,  set 

in  ebony  handle.     Length  of  cutting  edge,  mm 70  90 

Each 90  1.00 

3928.    KNIFE,  Cartilage,  Large,  all  steel,  with  flat  ground  blade,  135  mm  long.    Suitable  for  cartilage 

work  and  large  dissections.     Total  length,  250  mm 3.75 

3932.     NEEDLE,  Dissecting,  of  steel  with  plain  wood  handle  110  mm  long;  with  straight  sharp  point. 

Length,  130  mm per  dozen       .30 

3934.    NEEDLE,  Dissecting,  same  as  No.  3932,  but  with  bent  sharp  point per  dozen      .35 

3936.    NEEDLE,  Dissecting,  best  quality,  with  curved  sharp  point 30 

3938.     NEEDLE,  Dissecting,  same  as  No.  3936,  but  with  curved  blunt  point 30 

3940.     NEEDLE,  Dissecting,  same  as  No.  3936,  but  with  half  spear  point 30 

3942.     NEEDLE,  Dissecting,  with  full  spear  point,  with  double  cutting  edge 30 

3944.     NEEDLE,  Dissecting,  with  harpoon  shaped  point,  with  two  cutting  edges 30 

3946.     NEEDLE,  Dissecting,  hook  shaped 30 

3948.     NEEDLE  HOLDER,  of  brass,  nickel-plated,  with  screw  chuck,  with  one  straight  needle.   Length, 

85  mm .15 

3950.  NEEDLE  HOLDEK,  same  as  No.  3948,  but  with  one  bent  needle 15 

3951.  NEEDLES,  of  steel,  for  use  with  Nos.  3948  and  3950  Holders.     Length,  50  mm. 

Style   A  B  C  D 

Known  as straight         spear  bent  hook 

Per  dozen .08  .45  .12  .25 

OIL  STONE  for  sharpening  Scalpels  and  Knives,  see  Nos.  9608  to  9612. 

3958.  PAN,  Dissecting,  of  tinned  metal,  with  metal  loops  at  the  bottom  for  fastening  limbs  of  animals 

during  dissection;  size,  285x235x25  mm,  unlined 35 

3959.  PAN,  Dissecting,  same  as  No.  3958,  lined  with  wax  on  bottom 55 

3962.  PAN,  Dissecting,  of  heavy  tinned  metal,  japanned,  with  metal  loops  for  fastening  limbs  of  ani- 

mals during  dissection.     Dimensions,  290x190x30  mm  deep 40 

3963.  PAN,  Dissecting,  same  as  No.  3962,  but  with  bottom  covered  with  black  wax,  to  which  small 

objects  may  be  pinned 60 

3966.  PAN,  Dissecting,  of  seamless  agateware.     Dimensions,  300x200x30  mm  deep 35 

3967.  PAN,  Dissecting,  same  as  No.  3966,  but  with  bottom   covered  with   cork,  to  which  small  objects 

may  be  pinned .55 

RAZORS,  Section,  see  Microtome  Knives. 

3974.     SAW,  Bone,  of  steel,  nickel-plated,  parts  separable  for  sterilization.     Length  of  blade,  200  mm; 
total  length,  300  mm \ 3.30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


191 


B  C 

Nos.  3984-8. 


D 


E 


No.  3980. 


No.  3982. 


C 
No.  3996. 


No.  3990. 


They  are  suitable 


3080. 


3982. 


3984. 


3988. 


3990. 


SCALPELS 

Scalpels  are  carried  in  three  grades. 

Grade  C  is  made  from  a  good  grade  of  steel,  carefully  ground  and  sharpened, 
for  the  ordinary  elementary  laboratory  work  of  the  student. 

Grade  B  is  made  from  carefully  selected  steel  evenly  honed.  They  are  well  finished,  and  can  be 
used  for  the  more  advanced  laboratory  work  by  either  student  or  instructor. 

Grade  A  is  made  of  the  best  English  steel,  tempered  with  the  greatest  care.  The  blades  are  hol- 
low ground  and  finely  honed.  They  will  take  and  retain  an  edge  such  as  is  demanded  for  the 
most  delicate  dissections.  They  can  be  used  in  the  most  precise  work  in  the  private  or  research 
laboratory. 

SCALPELS,  REGULAR  SHAPE 

SCALPELS,  Grade  C,  with  black  wood  handles. 

No A 

Length  of  cutting  edge,  mm 25 

Each $0.40 

SCAIiPELS,  Grade  C,  all  steel,  easily  sterilized. 
No.  . 


B 

38 
.40 


C 
50 
.45 


Length  of  cutting  edge,  mm 25 


Each 
SCALPELS,  Grade  B,  with  ebony  handles. 

No 

Length  of  cutting  edge,  mm 

Each 

SCALPELS,  Grade  A,  with  ebony  handles. 

No A 

Length  of  cutting  edge,  mm 25 

Each 65 

SCALPELS,  Grade  A,  all  steel,  easily  cleaned  and  sterilized. 

No 

Length  of  cutting  edge,  mm 

Each  .. 


SCALPELS,  SPECIAL  SHAPES 

3996.     SCALPELS,  Grade  A,  with  ebony  handles. 

Style    " A 

Length  of  cutting  edge,  mm 35 

Each  ...  .60 


A 
25 
.50 

B 
32 
.65 

A 
25 

.85 


B 

35 
.70 


B 
32 
.50 

C 
38 
.65 

B 
32 

.85 


C 
35 
.70 


.45 

C 

38 
.50 

D 
45 
.65 

C 
38 
.85 


D 

10 
.60 


B 

38 
.45 

D 
45 
.50 

E 
50 
.70 

D 
45 

.85 


E 
50 
.80 


192 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


SCISSORS,  DISSECTING 


Dissecting  scissors  are  carried  in  three  grades,  A,  B,   and   C,   and  in   three   degrees  of  fineness, 

designated  as  fine,  medium  and  heavy. 

Grade  C  scissors  are  made  of  ordinary  cutlery  steel,  and  are  suitable  for  ordinary  student  labora- 
tory work. 
Grade  B  scissors  are  made  of  the  best  grade  of  cutlery  steel,  nickel-plated,  and  are   suitable  for 

precise  and  delicate  work  in  the  advanced  and  research  laboratory. 

Grade  A  scissors  are  made  of  the  best  grade  of  cutlery,  steel,  finely  finished.     They  are  made  with 
slide  lock  instead  of  screw  lock,  being  easily  separated  for   cleaning   and  sterilization.     These 
scissors  can  be  used  for  dissecting  and  surgical  work  where  freedom  from  bacterial  contamina- 
tion is  essential. 
4002.     SCISSORS,  Grade  C,  Heavy,  nickel-plated,  with  screw  lock,  with  straight  sharp  points.     Length, 

1 25  mm $0.45 

4004.     SCISSORS,  Grade  B,  Fine,  with  screw  lock.     Fine,  straight  sharp  points.     Length,  110  mm.       .85 
4006.     SCISSORS,   Grade   B,   Fine,   with    screw  lock.      Fine,  sharp  points,  curved   upwards.      Length, 

110  mm 1.00 

4008.     SCISSORS,  Grade  B,  Fine,  with  screw  lock.     Fine,  sharp  points  bent  at  angle  to  side.      Length, 

110  mm 80 

4010.     SCISSORS,  Grade  B,  Medium,  with  screw  lock.      Medium   fine,   straight    sharp   points.      Length, 

1 15  mm 85 

4012.     SCISSORS,  Grade  B,  Heavy,  with  screw  lock.     Heavy,  straight  points,  one  sharp  and  one  blunt. 

No A  B  C  D 

Length,  mm 125  140  150  175 

Each 1.00  1.25  1.50  2.00 

4016.     SCISSORS,  Grade  A,  Fine,  with  slide  lock  enabling  them  to  be  easily  taken  apart  for  cleaning 

and  sterilization.     Fine,  straight,  sharp  points.     Length,  115  mm 1.20 

4018.     SCISSORS,  Grade  A,  Fine,  with   slide  lock,  with   fine    sharp   points    curved   upwards.     Length 

115  mm 1.40 

4020.     SCISSORS,  Grade  A,  Fine,  with  slide  lock,  with  fine  sharp  points,  bent  at  angle  to  side.     Length, 

115  mm 2.25 

4022.     SCISSORS,  Grade  A,  Heavy,  with  slide  lock.     Heavy  straight  points,  one  sharp  and  one  blunt. 

Length,  mm ' 105  115  125 

Each 90  1.00  1.10 

4024      SCISSORS,   Grade  A,   Heavy,   with   slide   lock.     Heavy    straight    points,    both    blunt.     Length, 

140    mm 1.50 

4028.     SCISSORS,  Dissecting,  Coronary  Artery,  screw  lock.     Fine,  straight  points,  with  one  sharp  and 

one  probe  point 1.50 

4030.     SCISSORS,  Invertebrate  Dissecting,  for  the  most  delicate  work.     Very  fine,  sharp  points,  with 
all  metal  handle.     Length  of  cutting  edge,  10  mm;  total  length  of  scissors,  140  mm 4.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  8.  A. 


193 


No.  4036.   No.  4038.   No.  4040.  No.  4044.    No.  4046.   No.  4048.  No.  4054.  No.  4056.  No.  4064. 


No.  4060. 


4036.     SECTION  LITTER,  of  German  silver,  with  blade  16x18  mm;  total  length,  100  mm $0.22 

4038.     SECTION  LITTER,  with  two  German  silver  blades,  set  in  ebony  handle.     Width  of  large  blade, 

10  mm;  width  of  small  blade,  6  mm 50 

4040.     SECTION  LITTER,  similar  to  No.  4038,  but  with  6  mm  blade  only 50 

4042.  SECTION  LITTER,  with  ebony  handle,  and  thin,  flexible,  German  silver  blade,  12  mm  wide  .60 
4044.  SECTION  LITTER,  with  ebony  handle  and  thin,  flexible,  German  silver  blade,  20  mm  wide  .65 
4046.  SECTION  LITTER,  with  ebony  handle  and  thin,  flexible,  German  silver  blade,  38  mm  wide  .70 
4048.  SECTION  LITTER,  with  ebony  handle  and  perforated  bowl  18  mm  in  diameter,  for  handling 

delicate  specimens 60 

SECTION  RAZORS,  see  Microtome  Knives. 
4054.     SEEKER  or  Probe,  all  steel,  nickel-plated,  with  octagonal  handle  and  bent,  blunt  point,  as  used 

in  the  anatomical  laboratory  of  the  University  of  Chicago.     Length,  145  mm 35 

4056.     SEEKER  or  Probe,  all  steel,  nickel-plated,  with  hexagonal  handle.     One  end  terminates  in  a  fine, 

sharp  point,  while  the  other  is  curved,  with  sharp  edge  and  sharp  point.    Length,  155  mm       .40 
4060.     SHEARS,  Cartilage,  of  steel,  nickel-plated,  with  screw  joint.     Length  of  cutting  edge,  60  mm; 

total  length  of  shears,  230  mm 4^0 

4064.     TENACTJLTJM,  ebony  handle,  steel  shank,  with  tapering  sharp  hook.     Length,  160  mm 45 

4066.     TEN ACTJLUM,  same  as  Xo.  4064,  but  with  steel  handle.     Length,  160  mm 90 

DISSECTING  INSTRUMENT  CASES 

4072.  DISSECTING  CASE,  Leatherette,  of  best  quality  brown  leatherette,  almost  equal  to  leather  in 
appearance  and  durability,  single-fold,  lined  with  heavy  cloth,  and  having  cloth  flaps,  button 
fastener,  and  loops  for  6  instruments 30 

4074.  DISSECTING  CASE,  Leatherette,  similar  to  No.  4072,  but  two-fold,  with  loops  for  12  instruments 
.55 

4076.  DISSECTING  CASE,  Morocco,  of  genuine  morocco  leather,  two-fold,  lined  with  velvet,  and  hav- 
ing chamois  flaps,  button  fastener,  and  leather  loops  for  11  instruments 1.50 

4078.  DISSECTING  CASE,  Morocco,  similar  to  No.  4076,  but  three-fold,  with  loops  for  17  instruments 
1.80 


394 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  4086. 


No.  4092. 


No.  4098.  No.  4100. 

DISSECTING  INSTRUMENTS  IN  SETS 

The  following  sets  have  been  made  up  of  the  instruments  which  have  proved  most  popular  for  work 

in  botany,  zoology,  anatomy,  and  histology.     We  will  make  up  special  sets  to  meet  any  requirements, 

using  preferably  the  cases  in  the  preceding  list. 

4084.  DISSECTING-  SET,  consisting  of  No.  4072  single-fold  Leatherette  Case,  with  the  following  Grade 
B  and  C  instruments;  No.  3898  Forceps,  No.  3932  Needle,  No.  3934  Needle,  No.  3980B  Scalpel, 
No.  4002  Scissors  and  No.  F661  Rule $1.35 

4086.  DISSECTING  SET,  consisting  of  No.  4072  single-fold  Leatherette  Case,  with  the  following  Grade 
B  and  C  instruments:  No.  3898  Forceps,  No.  3948  Needle  Holder,  No.  3950  Needle  Holder,  No. 
3980B  Scalpel,  No.  4002  Scissors,  and  No.  F661  Rule 1.60 

4090.  DISSECTING  SET,  consisting  of  No.  4072  single-fold  Leatherette  Case,  with  the  following  Grade 
B  instruments:  No.  3904  Forceps,  No.  3906  Forceps,  No.  3948  Needle  Holder,  No.  3950  Needle 
Holder,  No.  3984C  Scalpel,  No.  4004  Scissors,  and  No.  F661  Rule 3.25 

4092.  DISSECTING  SET,  consisting  of  No.  4074  two-fold  Leatherette  Case,  with  the  following  Grade 
B  and  C  instruments:  No.  3898  Forceps,  No.  3902  Forceps,  No.  3932  Needle,  No.  3934  Needle, 
No.  3980B  Scalpel,  No.  3980C  Scalpel,  No.  4002  Scissors,  No.  4004  Scissors,  No.  4064  Tenaculum, 
and  No.  F661  Rule 3.85 

4094.  DISSECTING  SET,  consisting  of  No.  4074  two-fold  Leatherette  Case,  with  the  following  instru- 
ments: No.  3902  Forceps,  No.  3914  Forceps,  No.  3980A  Scalpel,  No.  3980C  Scalpel,  No.  4002 
Scissors,  No.  4004  Scissors,  No.  3948  Needle,  No.  3950  Needle,  No.  8978  Section  Razor  with 
folding  handle,  and  No.  F661  Rule 6.50 

4096.  DISSECTING  SET,  consisting  of  No.  4076  two-fold  Morocco  Case,  with  the  following  Grade  A  in- 
struments: No.  3904  Forceps,  No.  3906  Forceps,  No.  3924  Cartilage  Knife,  No.  3948  Needle,  No. 
3950  Needle,  No.  4056  Seeker  and  Tenaculum,  No.  3988C  Scalpel,  No.  3996A  Scalpel,  No.  4010 
Scissors,  and  No.  F661  Rule 6.50 

4098.  DISSECTING  SET,  consisting  of  No.  4078  three-fold  Morocco  Case,  with  the  following  instru- 
ments: No.  3908  Forceps,  No.  3912  Forceps,  No.  3914  Forceps,  No.  3990A  Scalpel,  No.  3990B 
Scalpel,  No.  3990D  Scalpel,  No.  4004  Scissors,  No.  4006  Scissors,  No.  4012A  Scissors,  No.  3924 
Cartilage  Knife,  No.  4066  Tenaculum,  No.  4056  Seeker,  No.  3920  Triple  Chain  and  Hook,  No. 
3880  Blowpipe,  2  No.  3890  Artery  Forceps,  No.  3891  Artery  Forceps,  and  No.  F661  Rule. .  14.00 

4100.  DISSECTING  SET,  Anatomical,  consisting  of  No.  4076  two-fold  Morocco  Case  and  the  following 
Grade  A  instruments:  No.  3882  Blowpipe,  No.  3914  Forceps,  No.  3890  Artery  Forceps,  No. 
3924  Cartilage  Knife,  No.  4054  Probe,  No.  4056  Seeker  and  Tenaculum,  No.  3988C  Scalpel,  No. 
3996A  Scalpel,  No.  3996B  Scalpel,  No.  4012D  Scissors,  No.  3920  Triple  Chain  and  Hooks,  and 
No.  F661  Rule 900 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


19o 


No.  4120. 


4138. 


4102.  DISSOLVING  TUBE,  Freas,  for  dissolving  solids  which  are  difficultly  soluble  without  the  aid  of 
heat  or  mechanical  agitation,  and  filtering  the  solution  at  the  same  time.  The  crystals  are 
placed  in  A  upon  a  plug  of  asbestos  or  cotton.  Suction  is  applied  at  B,  which  is  then  closed, 
and  a  circulation  starts  upward  through  D  and  E  down  through  C  and  F  on  account  of  the 
different  densities  of  the  liquids.  This  will  continue  until  the  entire  solution  is  of  the  same 
density.  Length  over  all  without  stop-cock,  37.5  cm;  capacity,  about  250  cc.  With  stop-cock, 
but  without  bottle  or  rubber  tubing $5.00 

DISTILLING  APPARATUS  FOR  WATER 

4120.  DISTILLING  APPARATUS,  Acme  Automatic  Water  Still.  Made  to  hang  on  wall  and  can  be 
placed  wherever  gas  and  water  connections  may  most  conveniently  be  made  with  pipes  or  rub- 
ber tubing.  Occupies  space  12x4  inches  on  the  wall,  projecting  only  14  inches  in  its  widest 
part.  Fitted  with  removable  cover  to  permit  inspection  if  desired.  Arranged  to  secure  maxi- 
mum amount  of  water  for  the  minimum  consumption  of  gas.  Made  of  copper  and  brass,  tin 
lined  and  nickel-plated.  Capacity,  one  gallon  per  hour  and  one  half.  With  gas  burner.  25.00 

4122.  DISTILLING  APPARATUS,  Automatic  Water  Still,  of  heavy  spun  copper,  nickel-plated,  without 

seams.  Can  be  used  on  Tripod  No.  4123  over  Buusen  burner  or  any  convenient  source  of  heat. 
Diameter  of  still,  11  inches;  height,  13  inches;  capacity,  3  quarts  per  hour  with  burner  using 
10  cubic  feet  of  gas.  With  block  tin  outlet  tube;  without  burner 29.00 

4123.  TRIPOD    SUPPORT   for   No.   4122    Distilling  Apparatus.      Diameter  of  rim,  10  inches;   height 

7  inches    1.75 

4136.  DISTILLING  APPARATUS,  Peerless  Automatic,  built  on  an  entirely  new  principle,  as  the  boiler 
is  so  shaped  that  the  steam  is  forced  through  the  water  to  its  center  where  it  passes  in  a  compact 
body  into  the  condensing  tube,  thus  reducing  the  amount  of  condensation  on  the  side  walls  of 
the  still.  Because  of  this  feature,  it  produces  distilled  water  at  a  very  low  expense  for  gas. 
The  parts  are  readily  accessible  for  cleansing.  The  boiling  vessel  is  of  cast  iron  and  not  easily 
burned  out  or  injured,  by  rough  handling.  The  condensing  tube  is  of  heavy  tinned  copper,  suf- 
ficiently large  to  insure  perfect  condensation  with  a  very  small  stream  of  water.  Finished  in 
bright  aluminum  and  lacquered  brass.  With  gas  burner. 

Capacity,  gallons 1  3 

Each 21.00  42.50 

4138.  DISTILLING  APPARATUS,  Ralston's  New  Process.  May  be  used  on  any  stove  and  does  not 
require  water  under  pressure.  The  storage  of  the  distilled  water  within  the  still  prevents  th? 
reabsorption  of  gases.  Although  not  entirely  automatic,  it  is  so  constructed  that  it  cannot  boil 
dry;  it  requires  little  care  or  attention.  It  is  made  of  copper  and  pure  tin.  Capacity,  from 
1  to  3  quarts  per  hour,  depending  on  the  amount  of  heat  used.  Weight,  7  Ibs.;  diameter, 
9  inches;  height,  14  inches , 12.00 


196 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  4126-7.    (Patent  Pending). 


Sectional  Diagram  Showing  Details  of  Construction. 


4126. 
4127. 


DISTILLING  APPARATUS,  Cenco  Polar,  Electrically  Heated.  This  still  has  been  scientifically 
designed  and  carefully  constructed  in  accordance  with  well  established  engineering  principles 
relating  to  the  efficient  evaporation  and  condensation  of  water,  and  possesses  certain  features 
not  found  in  other  stills. 

The  condenser  has  no  tubes  to  become  limed  up  or  leaky  but  consists  of  three  concentric  cyl- 
inders; the  outer  one  forming  the  jacket  of  the  still  is  cooled  by  radiation,  while  the  inner 
two  are  cooled  by  a  constant  stream  of  water  circulating  between  them  in  a  spiral  motion. 

The  boiling  chamber  is  designed  to  maintain  a  small  volume  of  water  at  constant  level,  spread 
out  to  afford  as  large  a  surface  as  possible  for  evaporation. 

The  vapor  flue,  through  which  the  steam  from  the  boiling  water  ascends,  is  high  and  wide, 
preventing  any  carrying  over  of  impurities  due  to  foaming  or  bursting  of  bubbles,  or  to  the 
velocity  of  the  vapor. 

The  steam  separator  at  the  top  of  this  flue  efficiently  separates  the  dry  vapor  from  the  liquid 
particles,  rolling  them  back  into  the  boiler. 

The  high  temperature  of  the  cooling  water — from  160°  to  180°F. — which  is  made  possible  by 
the  large  area  of  condensing  surface,  effectually  cooks  out  of  the  raw  water  any  odors  or 
dissolved  gases,  which  pass  out  through  vents  in  the  cover  of  the  still.  This  hot  water  is 
slowly  fed  to  the  boiler  as  required  and  consumes  but  little  heat  in  bringing  it  to  the  boiling 
point. 

The  heaters  are  of  the  well  known  Westinghouse  Bayonet  type,  designed  for  greatest  efficiency. 

The  interchangeable  base  makes  it  possible  to  lift  out  the  top  part  of  the  Cenco'Polar  Still  and 
set  it  in  another  base,  equipped  for  gas  or  steam  heat.  This  is  a  feature  peculiar  to  the 
Cenco  Polar  Still.  All  parts  of  the  still  are  easily  accessible  for  cleaning,  as  the  still  can 
be  taken  apart  without  difficulty  and  can  be  set  up  when  received  with  equal  ease. 

The  heat  exchange,  just  above  the  outlet  for  distilled  water,  reduces  the  temperature  to  within 
a  few  degrees  of  that  of  the  room.  By  throttling  down  the  supply  of  cooling  water,  distilled 
water  at  any  temperature  up  to  200°F.  can  be  obtained.  The  coil  of  block  tin  pipe,  through 
which  the  distilled  water  passes  on  its  way  through  the  heat  exchange,  is  surrounded  by  the 
cold  condensing  water  just  as  it  enters  the  still  from  the  tap;  consequently  there  is  no  oppor- 
tunity for  vapor  to  escape. 

An  aerator  can  be  supplied  at  a  small  additional  charge  when  it  is  desired  to  use  the  distilled 
water  for  drinking  purposes. 

Complete  as  described,  constructed  throughout  of  cold  rolled  copper  heavily  tinned,  with  West- 
inghouse Bayonet  Heaters,  attachment  cord  and  three-heat  switch  for  use  on  either  A.C.  or 
D.C.  circuits.  Sizes  A  to  C  are  nickel-plated  outside;  D  to  F  are  furnished  in  burnished  cop- 
per. All  stills  are  furnished  on  flat  base  as  illustrated,  but  may  be  had  mounted  on  legs  with- 
out extra  charge  if  specified  when  ordering.  Wall  brackets  are  furnished  for  attachment  to 
the  wall  at  a  small  extra  charge  as  listed  below.  With  full  instructions  for  setting  up  and 

operating.    No A  B  C 

Capacity,  gallons  per  hour 1  2  3 

Height,   inches 12  13%  15 

Diameter,   inches 10  11  12 

For  110  volts $80.00       125.00       225.00       375.00 

For  220  volts 87.50       132.50       235.00       375.00 


D 

5 
20 


E 

10 

28 

15 

700.00 
700.00 


F 

15 

32 

18 

900.00 
900.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A, 


197 


No.  4132,  sho-wing  construction. 


No.  4133,  shown  mounted  on  legs. 


EXTRA  ELECTRIC  HEATERS  for  Nos.  4126  and  4127. 

Tor  No A              B  C              D  E  P 

4128.  Each,    for  110  volts $30.00         35.00  45.00  50.00  60.00  75.00 

4129.  Each,   for  220   volts 37.50         42.50  45.00  50.00  60.00  75.00 

4130.  AERATOR,  for  use  with  Cenco  Polar  Stills,  for  the  introduction  of  pure  sterile  air  into  the 

water  when  desired  for  drinking  purposes. 

For  No A  B  C  D  E  F 

Each 4.50  5.50  6.50  7.50  9.50         14.00 

4131.  WALL  BRACKETS  for  use  with  Cenco  Polar  Stills,  for  attachment  to  wall. 

For   No A  B  C  D  E  F 

Per  pair  6.00          6.50          7.00          8.00          8.50          9.50 

4132.  DISTILLING  APPARATUS,  Cenco  Polar,  same  as  No.  4126,  but  equipped  with  interchangeable 

base  and  burner  for  coal  or  natural  gas.     Finished  in  burnished  copper  and  polished  brass. 

No A  B  C  D 

Capacity,    gallons 1  2  5 

Each    60.00       100.00       125.00       175.00 

4133.  DISTILLING  APPARATUS,  Cenco  Polar,  same  as  No.  4126,  but  equipped  with  interchangeable 

base  and  steam  coil  for  steam  heat,  under  a  pressure   of   10  to   20  pounds.     Finished  in  bur- 
nished copper. 

No A  B  C  D 

Capacity,    gallons 1  2  5 

Each    60.00       100.00       125.00       175.00 

Note: — Nos.  4132  and  4133  may  be  had  in  nickel-plated  finish  at  an  additional  cost  of  $5.00. 


STILLS  OF  LARGE  CAPACITY 

We  are  prepared  to  furnish  information  and  prices  upon  distilling  plants  of  large  capacity, 
up  to  1000  gallons  per  hour.  We  can  place  at  the  disposal  of  prospective  purchasers  the 
engineering  knowledge  and  technical  skill  of  the  Jewell  Polar  Company,  gained  through 
years  of  successful  experience  in  still  design  and  manufacture.  Write  us  at  length  about  your 
particular  problem. 


398 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  4148. 


No.  4142. 


No.  4152. 


No.  4153. 


4142. 


4148. 


4149. 


4152. 


DISTILLING  APPAKATUS,  Stokes  Automatic,  steam  heated.  These  stills  have  two  features  which 
render  them  unusually  effective  in  the  production  of  pure  distilled  water.  First,  they  utilize 
the  heat  generated  in  the  still  to  preheat  the  incoming  water  to  the  boiling  point,  thus  requir- 
ing a  very  small  quantity  of  live  steam  to  keep  them  in  operation  after  once  started.  Second, 
by  preheating  the  feed  water  before  it  enters  the  distilling  chamber  ammonia  and  other  gases 
are  liberated  and  permitted  to  escape  into  the  atmosphere  through  an  opening  in  the  condenser 
provided  for  this  purpose,  preventing  their  reabsorption  by  the  distilled  water.  The  distilling 
chamber  and  condensing  cylinder  are  of  cast  iron  galvanized  to  withstand  corrosion.  The  con- 
denser tubes  are  brass,  heavily  tinned  inside  and  out.  These  stills  may  readily  be  flushed  for 
cleaning  by  means  of  a  valve  connecting  with  the  drain,  or  the  copper  lid  may  be  removed  and 
the  inner  chamber  scrubbed.  They  are  self-contained,  requiring  only  the  two  connections  for 
steam  and  water,  and  are  shipped  ready  to  set  up.  Capacities  are  based  on  a  steam  pressure 
of  at  least  20  pounds. 

B 

2% 
4 

no 

65.00 


No. 

Capacity  per  hour,  gallons 

Height,  feet  

Weight,  pounds 

Each  . 


C 
5 


D 

10 


35 
$27.00 


110.00 


325 
165.00 


E 
25 

7 

7.10 
275.00 


F 
60 


1200 
500.00 


G 

100 

71/2 

1500 
650.00 


DISTILLING  APPARATUS  FOR  SPECIAL  USES 


DISTILLING  APPARATUS,  copper  retort,  tin  lined,  with  removable  head,  connected  with  pure 
block  tin  condensing  worm,  enclosed  in  zinc  vessel,  with  proper  inlets  and  outlets. 


12.85 


B 

1 

17.00 


C 


B 

1 
10.00 


22.05 

C 

2 

13.30 


D 

3 

29.25 


E 


No. 

Capacity,  gallons 

Each 

RETORTS  only  of  No.  4148. 

No A 

Capacity,  gallons  % 

Each 7.35 

CONDENSING  VESSEL  only  of  No.  4148,  s?e  Condensers  No.  3240. 

DISTILLING  APPARATUS,  for  the  destructive  distillation  of  heavy  oils  and  other  liquids  or 
solids  requiring  a  high  heat.  The  distillation  may  be  made  by  live  steam  or  by  direct  heat, 
with  or  without  agitation  by  hot  air  blown  through  as  desired.  The  still  is  of  heavy  cop- 
per with  brass  fittings.  Capacity,  %  gallon  17.50 


D 

3 

17.75 


39.00 


E 

5 

24.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


199 


No.  4156. 


No.  4168.     No.  4170.     No.  4172. 


No.  4158. 


No.  4160. 


No.  4162. 


4153.  DISTILLING  APPARATUS,  similar  to  No.  4152,  but  larger  and  heavier,  with  cover  bolted 
on  and  jointed  delivery  tube.  (For  illustration,  see  page  198.) 

No A               B               C  D 

Capacity,    gallons 1                2                3  5 

Each    . ". '. $26.50        39.60         46.20  52.80 

4156.  DISTILLING  APPARATUS,  for  destructive  distillation  of  oils,  heavy  liquids  and  solids  at 
high  temperatures.  Made  of  heavy  copper  with  brazed  seams;  with  flanges  held  together 
by  6  thumb  screw  clamps.  Can  be  easily  taken  apart  to  remove  residue. 

No ". A  B  C 

Capacity,    gallons • %  1  2 

Each   . '. 33.00        37.50        49.50 

4158.  DISTILLING  APPARATUS.  Hortvet's,  for  determining  volatile  acids  in  wines  or  vinegars, 
designed  by  Dr.  Julius  Hortvet  of  the  Minnesota  State  Food  and  Dairy  Commission.  (See 
Journal  of  "industrial  and  Engineering  Chemistry.  Vol.  1,  No.  1,  for  January  1909,  page 
31)  Y 8.00 

4160.  DISTILLING  APPARATUS.  Hulett's,  for  Mercury,  as  used  by  the  United  States  Bureau  of 
Mines.  Consists  of  a  500  ec  flask  with  long  neck  ending  in  a  stop-cock,  side  tube,  condens- 
er and  receiver  with  ground  connections.  (See  Bulletin  42  of  the  United  States  Bureau  of 
Mines)  12.00 

4162.  DISTILLING  APPARATUS,  Salleron's,  of  copper,  for  use  in  the  determination  of  the  per- 
centage of  alcohol  in  wine,  beer,  cider,  etc.  Capacity,  y3  pint.  Complete  with  alcohol  lamp, 
hydrometer  reading  from  0  to  100  degrees  Proof  and  Tralle  and  100  cc  graduated  cylin- 
der    13.00 

Note: — For  HYROMETERS  for  Beer,  see  No.  7676. 

DISTILLING  APPARATUS  for  the  determination  of  ammonia  in  water,  see  Water  Analysis 
Apparatus. 

4168.    DISTILLING  TUBE,  for  fractional  distillation,  plain  form;  length,  9  inches;  diameter,  %  in.  .20 

4170.     DISTILLING  TUBE,  with  one  Isulb;  length,  8  inches;  diameter,  %  inch 36 

4172.     DISTILLING  TUBE,  with  two  bulbs;  length,  10%  inches;  diameter,   %  inch 50 


200 


OENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


4174.       No.  4176. 


NO.  4178.       No.  4180.       No.  4182.         No.  4184.      No.  4186.     No.  4188. 


4180. 

4182. 
4184. 

4186. 
4188. 


DISTILLING  TUBE,  Glinky's,  with  glass  valves.    Length  over  all,  15  inches $2.40 

DISTILLING  TUBE,  Hempel's,  filled  with  glass  beads.    Length  over  all,  16  inches 3.50 

DISTILLING  TUBE,  Knight,  for  use  in  the  separation  of  xylenols  and  higher  homologues  from 
phenol  and  the  cresols.  The  dimensions  are  so  proportioned  as  to  provide  a  layer  of  liquid 
in  the  bottom  bulb  which  serves  as  a  condensing  medium  for  the  xylenols  and  higher  homo- 
logues, while  allowing  the  phenol  and  cresols  to  pass  through.  (See  Journal  of  Industrial 
and  Engineering  Chemistry,  Vol.  X,  No.  1,  for  January  1918,  page  16) 2.25 

DISTILLING  TUBES,  LeBel-Henninger's. 

No 

Number   of    bulbs 

Each   


A 

2 

1.50 


B 

3 
2.00 


c 

4 
2.50 


D 

5 
3.00 


DISTILLING  TUBES,  Wurtz's,  with  two  bulbs.     Length  over  all,  12  inches 90 

DISTILLING  TUBES,  Young's  Form,  for  the  distillation  of  small  quantities.     With  rod  and  15 
disks.     Length  over  all,  18  inches 3.00 

DISTILLING  TUBE,  similar  to  No.  4184,  but  with  20  disks  and  21  constrictions.    Length  over 
all,   18   inches 4.50 

DISTILLING  TUBES,  with  pear-shaped  bulbs. 

No A  B 

Number  of  bulbs 4  12 

Length  over  all,  inches 10  20 

Each    3.00  4.50 


NO.  4192. 


No.  4194. 


No.  4196. 


4192.    DIVIDER,  Plain,  of  brass.     Length,  4%  inches 60 

4194.    DIVIDER,  Spring.     The  popular  Yankee  polished  steel  spriflg  divider,  5  inches  long 50 

4196.   DIVIDER,  Wing,  of  polished  steel,  sharp  points,  6  inches  long,  with  set  screw 40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


201 


No.  4202. 


No.  4204. 


No.  4218. 


No.  4220. 


No.  4222. 


DRAWING  INSTRUMENTS 


4200.    DRAWING  BOARDS,  pine  wood,  with  side  ledges  clamped. 

No A  B  C 

Size,  inches 16x22  20x24%  23x31 

Each $1.25  1.50  2.25 

DRAWING  COMPASS,  steel  spring  bow  pencil  compass.     Made  of  German  silver,  nickel-plated. 
Steel  points,  metal  handle ;  length  3  %  inches  $1.25 

DRAWING  DIVIDER,  steel  spring  bow  divider.     Metal  handle,  steel  points;  length,  3%  inches. 

2.10 


4202. 
4204. 
4214. 


DRAWING  INKS  in  the  following  colors:    blue,  brick  red,  brown,  carmine,  green,  indigo,  orange, 

scarlet,  vermilion,  violet,  yellow  and  waterproof  black Per  %  ounce  bottle         .35 

In  ordering  please  state  the  color  desired. 
4215.    DRAWING-  INKS  in  nicely  finished  hardwood  tray.     Choice  of  five  different  colors,  selected  from 

list  under  Xo.  4214 2.30 

In  ordering  please  state  the  colors  desired. 

4218.  DRAWING  INSTRUMENTS  for  elementary  work,  of  brass,  in  cloth  covered  case  lined  with  vel- 
vet. Contains  ruling  pen,  5-inch;  compass,  4%-inch,  with  fixed  needle  point,  pen  and  pencil 
points  and  lengthening  bar;  and  plain  dividers,  3%-inch 2.50 

4220.  DRAWING  INSTRUMENTS,  of  German  silver  with  steel  points,  in  cloth  covered  ease  lined  with 
velvet.  Contains  ruling  pen,  5%-inch;  compasses,  6-inch,  with  fixed  needle  point,  pen  and  pencil 
points  and  lengthening  bar;  dividers,  4^-lnch;  bow  pen,  3-inch;  and  box  of  leads 7.50 

4222.  DRAWING  INSTRUMENTS,  of  German  silver,  American  made,  of  excellent  quality,  design  and 
finish,  in  cloth  covered  case  lined  with  velvet.  This  is  a  high  grade  set;  greatly  superior  to  the 
cheaply  made  imported  sets.  All  points  and  blades  are  ground  and  polished  to  the  exact  de- 
gree of  fineness  required  to  secure  the  best  results.  Complete  with  5%-inch  ruling  pen  with 
aluminum  handle;  e^-inch  compass  and  divider  of  improved  design,  with  4-inch  lengthening 
bar,  pencil  and  pen  points;  handle  for  use  with  pencil  and  pen  points  for  ruling  work;  3%-inch 
bow  pen;  box  of  leads;  hollow  handled  screw  driver  and  extra  points  for  divider 10.65 


202 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  4224. 


No.  4230. 


No.  4238  (in  use). 


No.  4244. 


HHHHHH  *•  PARAGON  DPAWIN. 


No.  4236. 


No.  4242. 


4224.    DRAWING  PEN,  Bow,  steel  spring,  with  steel  points  and  metal  handle $2.25 

4226.    DRAWING  PEN,  Ruling,  spring  blade,  metal  handle 1.75 

4230.  BLACKBOARD  DRAWING  INSTRUMENTS  a  set  of  four  pieces,  consisting  of  a  24-inch  T  square, 

a  36  inch  straight  edge,  a  24-inch  triangle  graduated  in  inches,  and  a  15%  inch  protractor. 
Per  set      4.50 

4231.  T  SQUARE  only  of  No.  4230. l.OQ 

4232.  STRAIGHT  EDGE  only  of  No.  4230 75 

4233.  TRIANGLE  only  of  No.  4230 1.50 

4234.  PROTRACTOR  only  of  No.  4230 2.10 

4236.    BLACKBOARD  COMPASS,  of  wood,  15  inches  long,  with  crayon  holder  and  rubber  foot.  .         .60 
4238.    BLACKBOARD  T-SQUARE,  Upright  T-Square,   for   use   in   making   mechanical   drawings   on   a 

blackboard.  This  device  fits  into  the  ordinary  chalk  tray  and  is  provided  with  two  sets  of  guid- 
ing rollers  which  keep  the  blade  parallel  to  the  blackboard  and  yet  free  from  it.  An  adjust- 
able slide  is  provided  for  drawing  horizontal  lines  and  both  vertical  and  horizontal  blades  are 
graduated.  The  Upright  T-Square  is  used  in  the  same  manner  as  the  Draftsman 's  T-Square  and 
is  of  service  in  any  subject  requiring  drawings,  sketches,  plots,  tabulations  or  diagrams. 


No 

Length,  inches 

For  blackboard  height,  inches 

Each 

4240.  DRAWING  PAPER,  slightly  grained  surface. 

No 

Size  sheet,  inches 

Per  quire 

4242.  DRAWING  PENCILS,  Faber,  polished. 

No 

Each 

4244.  RULES,  Parallel,  ebony. 

Length,  inches 

Each 


A 

15x20 
.80 


B 

19x24 
1.00 


40 

42 

4.25 

C 

22x30 
•  1.40 

4H 
.12 

9 
1.25 


B 

46 

48 

4.25 

D 

27x40 
3.50 

6H 
.12 

12 
1.40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


203 


No.  4254. 


No.  4249C-D. 


No.  4260. 


No.  4264. 


4246. 
4248. 

4249. 
4250. 

42.12. 

42.14. 
42.1(5. 

4258. 
4260. 

4261. 
4264. 


SCALE,  Triangular,  boxwood,  one  edge  graduated  for  12  inches  in 
scales  of  ««,..,  %,  sHoi  %,  %,  %,  %,  1,  1%  and  3  inches  to  the  foot 
For  STRAIGHT  EDGE,  see  No.  12974. 
TRIANGLES,  Celluloid. 

No 

Angles,  degrees 

Longest  side,  inches 

Each 

TRIANGLES,  Hard  Rubber. 

No 

Angles,  degrees 

Longest  side,  inches 

Each , 

TRIANGLES,  Pearwood,  framed. 

No 

Angles,  degrees 

Longest  side,  inches 

Each 

T  SQUARES,  pearwood  blade  and  head,  fine  quality 

Length,  inches 

Each 


No.  4258. 

other  edges  have 
$0.50 


A 

30&60 

6 

.30 

A 

30&60 

6 

.20 

A 

30  &  60 

6 

.15 


B 

30&60 

8 

.45 

B 

30&60 

8 

.30 

B 

30&60 

8 

.18 

24 
.30 


C 

45 

6 

.45 

C 

45 

6 

.30 

C 

45 

6 

.18 

30 
.45 


D 
45 

8 
.60 


45 

8 

.33 

D 
45 

8 
.25 

36 
.60 


DRAW  KNIFE,  polished  cast  steel,  razor  blade,  8-inch 1.30 

DRAW  PLATE,  of  hardened  steel,  for  drawing  wire  to  smaller  sizes.  Numbers  are  not  standard 
gauge,  but  approximate  those  of  the  Starrett  gauge.  With  holes  numbered  from  1  to  30.  4.00 

DRILL,  Breast,  double  gears,  capacity  of  chuck  0  to  %-inch,  two  speeds;  adjustable  breast  plate: 
spindle  runs  in  a  hardened  steel  cone  bearing 5.50 

DRILL,  Hand,  single  gear,  length  10%  inches,  with  8  'steel  drill  points  from  i/j6  to  i%4  inch; 
capacity  of  chuck  0  to  %2  inch;  holds  either  fluted  or  round  shank  drills.  Frame  all  steel,  pol- 
ished and  nickel-plated 2,65 

EXTRA  DRILL  POINTS  for  No.  4260,  plain  round  shanks.  May  be  used  also  with  Nos.  4258,  4264 
and  4270  Drills.  In  sets  of  eight,  1{6  to  1^4  inches Per  set  .70 

DRILL,  Hand,  double  gears,  two  speeds,  capacity  of  chuck  0  to  %  inch;  knurled  nut;  frame  of 
malleable  iron,  japanned 4.65 


204 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  4280. 


No.  4282. 


No.  4284. 


4266. 


4267. 
4270. 

4272. 


4274. 


4276. 
4280. 

4282. 


4284. 
3143. 
3144. 

4350. 


DRILL,  Hand,  Automatic,  9M>  inches  long,  nickel-plated.  Eight  steel  fluted  shank  drills,  from 
YIQ  to  n/M  inches,  enclosed  in  the  handle  in  numbered  compartments.  A  very  useful  tool  for 

boring  holes  in  wood,  bone,  etc $2.00 

EXTRA  DRILL  POINTS,  fluted  shank,  as  supplied  with  No.  4266.     In  sets  of  eight. .Per  set         .80 
DRILL,  Hand,  Automatic,  11  inches  long,  nickel-plated,  with  wood  handle.     Capacity  of  chuck, 

0  to  y±  inch  round-shank  drills.     Without  drill  points 2.80 

DRILLS,  Twist,  straight  round  shank,  for  wood  or  metal. 

Diameter,  inches He         V6         ^10         %         ^16         %         7Ae         % 

Each 14         .16        .20         .28         .36        .50        .72       1.00 

DRILLS,  Twist,  straight  round  shank.  Nos.  1  to  60,  Stubs'  steel  wire  gage,  mounted  on  neat  iron 
base  which  can  also  be  used  as  a  Stubs'  Steel  and  Wire  G-age.  Indispensable  for  the  labora- 
tory shop 9-45 

DRILL  GAGE.    Stubs'  steel  gage  Nos.  1  to  60 2.25 

DRYING-  APPARATUS,  Bennert's,  for  organic   analysis,   consisting   of   four   drying   jars   with 

sealed  in  tubes.     Mounted  on  board  as  shown 13.50 

DRYING-  APPARATUS,  Tauber's,  with  2  U  tubes  and  4  jars  with  sealed  in  tubes.     Mounted  on 

board  as  shown 16.50 

DRYING  OVENS,  soe  Ovens,  Drying. 

DRYING  TUBE,  Liebig's 40 

DRYING  TUBE,  Vanier's,  for  zinc,  as  used  in  No.  3138  Vanier  Combustion  Apparatus 1.10 

DRYING  TUBE,  Vanier's,  for  sulphuric  acid,  as  used  in  No.  3138  Vanier  Combustion  Appar- 
atus         1-90 

EBULLIOMETER,    Salleron's,    of   polished   copper   with  jacket  around   burner;     for   the   rapid 
estimation  of  alcohol  in  wine,  beer,  etc.    Complete  in  case  with  directions  for  use 60.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


205 


Removable 
Coil  System. 


No.  F4453. 


ELECTRICAL  INSTRUMENTS,  ALL  KINDS 

BATTERIES,  Primary  and  Storage,  see  general  heading  Batteries. 

BELLS,  Electric,  see  general  heading  Bells. 

CONDENSERS,  Paper  and  Mica,  see  Catalog  F  of  Physical  Apparatus. 

DEMONSTRATION  ELECTRICAL  APPARATUS,  see  Catalog  F  of  Physical  Apparatus. 

ELECTROLYSIS  OF  WATER  APPARATUS,  see  Lecture  Apparatus. 

ELECTROLYTIC  APPARATUS,  see  Xo.  5140. 
F3609.  ELECTROMAGNET,  5  ohm  resistance,  for  instrument  making $1.00 

ELECTROSCOPES,  see  Radioactivity  Apparatus. 

ELECTROSTATIC  APPARATUS,  see  Catalog  F  of  Physical  Apparatus. 

FURNACES,  see  general  heading  Furnaces. 

F4453.  GALVANOMETER,  D'Arsonval,  Wall  Form.     This  Galvanometer  is  a  superior  instrument,  com- 
pact in  design,  and  well  finished  in  every  detail. 

The  Magnet  is  laminated,  giving  a  strong,  uniform  and  permanent  field,  which  is  concentrated  by 
a  soft  iron  core.  The  instrument  is  mounted  on  a  finely  finished  hardwood  board. 

Coil  System.  As  noticed  from  the  illustration,  one  of  the  principal  features  of  this  Galvanometer 
is  its  REMOVABLE  COIL  SYSTEM.  The  coil  is  suspended  in  a  frame  and  forms  with  it  a 
I'NIT  which  slides  into  place  by  means  of  guides  into  a  good  electrical  contact.  It  is  there- 
fore posible,  by  securing  any  number  of  coil  systems,  to  have  a  universal  instrument  with  only 
the  additional' cost  of  the  extra  systems.  Also,  if  any  adjustments  or  repairs  are  to  be  made 
on  the  suspension  system,  the  frame  can  be  removed  and  laid  flat  on  the  table. 

Each  Galvanometer  is  supplied  with  a  250  ohm  DEAD  BEAT  Coil,  with  a  plane  mirror  of  %-ineh 
diameter.  Extra  Coils,  Dead  Beat  and  Ballistic,  are  listed  below. 

The  Suspension.  The  upper  suspension,  unless  otherwise  requested,  is  a  steel  ribbon  (see  No. 
F4515),  which  has  a  high  tensile  strength  and  a  zero  set  of  less  than  a  millimeter.  The  sensi- 
bility can  be  much  increased  by  the  substitution  of  phosphor-bronze  suspension. 

The  Reading  Device  consists  of  a  telescope  with  achromatic  objective  and  a  biekrome  scale 
mounted  upon  an  adjustable  arm,  which  may  be  entirely  removed  when  not  in  use. 

The  Housing  is  of  cast  aluminum,  combining  strength  with  lightness,  and  is  detachable  by 
loosening  two  thumb  screws,  giving  easy  access  to  the  interior.  A  large  window  is  provided 
for  viewing  the  moving  system. 

Mounting  and  Leveling.  The  galvanometer  is  suspended  on  the  wall  by  means  of  two  suspension 
loops  on  the  hardwood  board  which  supports  the  magnet  and  housing.  These  loops  are  pro- 
vided with  leveling  screws  and,  with  a  third  leveling  screw  in  the  center  of  the  base  board, 
provide  a  convenient  means  of  leveling  the  instrument. 

Sensibility.  From  the  mean  of  a  number  of  readings  the  sensibility  in  megohms  was  found  to 
be  as  follows: 

With  dead  beat  coil  of  resistance,  ohms 5  250  500 

At  working  distance 3.5  33  48 

At  one  meter  distance 7.3  68  100 

Complete  with  250  ohm  Dead  Beat  coil,  and  jeweler  'a  screwdriver   35.00 


206 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  F4473. 


No.  F4475. 


F4454. 
F4456. 


GALVANOMETER,  D'Ars'onval,  Table  Form.    Same  as  No.  F4453,  but  mounted  on  a  heavy  tripod 

for  table  use $37.50 

COIL  SYSTEMS,  Dead  Beat,  for  Nos.  4453-4. 


No. 

Resistance,  ohms 
Each 

F4457.  COIL  SYSTEMS,  Ballistic,  for  Nos.  4453-4. 
No 

Resistance,  ohms 
Each 


A 

5 

7.50 


B 

250 
7.50 


C 

500 
8.00 


ABC 

150  500  1000 

8.50  8.50  9.00 

F4461.  GALVANOMETER,  Portable,  Student's,  9  cm  wide  by  9  cm  high,  with  inclined  scale.  With 
one  volt  a  deflection  of  1  millimeter  (1  scale  division)  will  be  obtained  through  62,500  ohms. 
Suitable  for  elementary  Wheatstone  Bridge  work.  Complete  with  zero  adjusting  device. 
11.25 

F4463.  GALVANOMETER,  Portable,  D  'Arsonval  Type,  as  used  in  commercial  testing  sets,  and  built  for 
hard  service.  Gives  1  scale  division  deflection  with  1  volt  through  about  100,000  ohms.  15.00 

F4465.  GALVANOMETER,  Portable,  D'Arsonval  Type,  as  used  in  our  No.  F4749  Testing  Set.  Has  a 
suspended  coil  system  so  that  all  troubles  due  to  the  dulling  of  the  pivots  as  in  the  old  style 
instruments  is  entirely  obviated.  Sensibility,  1  megohm,  i.  e.,  gives  one  scale  division  deflec- 
tion with  one  volt  through  1,000,000  ohms.  Mounted  on  a  substantial  hard  rubber  top  in  a 
finely  finished  hardwood  case 50.00 

GALVANOMETER  ACCESSORIES 

F4473.  UNIVERSAL  SHUNT,  Ayrton-Mather.  This  shunt  may  be  used  with  any  galvanometer,  and 
therefore  is  far  more  useful  than  the  ordinary  type  of  shunt.  The  total  resistance  is  10,000 
ohms,  with  shunt  powers  of  1,  5,  10,  50,  103,  500  and  1000.  It  is  also  fitted  with  a  position  in 
which  the  galvanometer  is  shorted  through  10,000  ohms,  and  one  in  which  both  circuits  are 
open  All  adjustments  are  made  by  turning  a  knob  of  hard  rubber.  Mounted  in  a  fine  ma- 
hogany case  with  hard  rubber  top 35.00 

UNIVERSAL  SHUNT,  simpler  design  than  No.  F4473,  but  suitable  for  use  with  any  galvano- 
meter, and  therefore  far  more  useful  than  the  ordinary  type  of  shunt.  The  total  resistance 
is  5000  ohms,  which  is  sufficiently  high  for  use  with  any  of  the  galvanometers  listed  in  our 
catalogs.  It  is  arranged  for  shunt  powers  of  1,  10,  100  and  1000,  the  different  adjustments 
being  made  by  use  of  a  single  plug.  When  the  plug  is  at  the  zero  position  the  main  circuit  is 
complete,  but  no  current  can  flow  through  the  galvanometer.  Mounted  in  a  brass  case  with 
wood  base  and  hard  rubber  top 20.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


207 


No.  F4481. 


No.  4694. 


F4481.  D'ARSONVAL  KEPAIR  KIT.  Consists  of  a  neat  wooden  box  containing  two  pairs  of  forceps 
for  handling  suspensions,  a  watchmaker's  screw  driver,  suitable  for  small  screws  on  any  gal- 
vanometer, 6  upper  steel  suspensions  (see  Xo.  F4515)  and  3  lower  copper  suspensions  (Xo. 

F4483),  all  conveniently  accessible.     For  use  with  No.  F4453  Galvanometer $3.00 

F4482.  D'ARSONVAL  REPAIR  KIT.  Same  as  No.  F4481,  with  phosphor  bronze  (see  No.  F4511)  in- 
stead of  steel  upper  suspension 3.00 

F4483.  LOWER  SUSPENSION  only,  copper,  spiral  form,  as  used  on  No.  F4453  Galvanometer 20 

F4491.  GALVANOMETER  MIRROR,  plane,  %  inch  diameter 35 

F4492.  GALVANOMETER  MIRROR,  plane,  %  inch  diameter 60 

F4493.  GALVANOMETER  MIRROR,  concave,  1  meter  focus,  %  inch  diameter 1.50 

F4494.  GALVANOMETER  MIRROR,  concave,  2  meter  focus,  »/£  inch  diameter 1.50 

F4511.  GALVANOMETER  SUSPENSION  RIBBON,  Phosphor  Bronze,  0.001x0.013  inches.. Per  foot  .10 
F4512.  GALVANOMETER  SUSPENSION  RIBBON,  Phosphor  Bronze,  0.0007x0.005  inehes.Per  foot  .10 
F451o.  GALVANOMETER  SUSPENSION  RIBBON,  Steel,  0.0013x0.004  inches Per  foot  .10 


GENERATORS 

4694.  GENERATORS,  Dynamos,  Shunt  Wound,  110  volt.  The  following  General  Electric  Dynamos  are 
adaptable  for  all  kinds  of  electrical  lighting  purposes,  charging  batteries,  etc.,  etc.,  and  are 
guaranteed  to  be  free  from  mechanical  or  electrical  defects.  The  Dynamos  are  of  approved 
bi-polar  construction,  of  the  inter-pole  or  regulating-pole. type,  insuring  perfect  commutation. 
The  prices  include  the  Dynamos  complete  with  Field  Bheostat,  Sliding  Base  and  Standard 
Pulley. 

No A  B 

Power,  kilowatts %  % 

No.  of  25  watt  lamps 

Speed,  r.  p.  m 

Diameter  of  pulley,  inches 

Width  of  pulley  face,  inches 


Shipping  weight,  Ibs. 
Each  . 


No 

Power,  kilowatts 

No.  of  25  watt  lamps 

Speed,  r.  p.  m 

Diameter  of  pulley,  inches. . . 
Width  of  pulley  face,  inches. 

Shipping  weight,  Ibs 

Each   . 


20 

2500 

3% 

2 

100 

143.45 


25 

1150 
4% 

3 

185 

210.40 


30 
2500 
4% 


F 

1% 
73 

2500 
4% 

O 

170 
207.90 


80 

1150 

4% 

4 

390 
376.70 


120 
153.75 

H 

2Yi 

90 

1700 

4% 

3 

270 
344.75 


D 

1 

40 
2500 
4% 

2 

130 

178.60 


J 

3 

120 

1700 

4^2 

4 

390 
376.70 


E 
1 

40 
1700 

4% 


170 
202.10 

K 
5% 
220 
1700 
5% 
4 

540 
471.20 


For  DEMONSTRATION  DYNAMOS,  see  Catalog  E. 


208 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  V.  8.  A. 


No.  4704. 


No.  4708. 


No.  F3665. 


No.  F3681. 


4704.  GENERATOR,  Electric  Charging  Dynamo,  for  charging  storage  batteries.  Similar  to  No.  4708, 
but  larger,  weighing  23  Ibs.  Generates  7  volts,  11  amperes,  at  2000  r.  p.  m $25.00 

4706.  GENERATOR,  Electric  Plating  Dynamo.  Similar  to  No.  4704,  but  wound  for  4  volts,  15  am- 
peres   25.00 

4708.  GENERATOR,  Experimental  Dynamo.  A  shunt-wound  dynamo  particularly  desirable  for  experi- 
mental purposes.  It  will  light  to  full  power  twelve  6  volt  3  C.  P.  lamps.  The  field  is  of  the 
ring  type,  cast  solid  with  the  frame.  The  coils  are  form  wound,  carefully  taped  and  shellacked; 
they  are  entirely  safe  from  mechanical  injury  or  breakdown.  The  armature  is  of  the  drum 
type,  laminated,  slot  wound — it  does  not  heat.  The  commutator  is  of  hard  copper,  carefully 
insulated  with  mica.  The  brush  holders  are  of  new  design,  of  the  radial  type,  mounted  on  an 
adjustable  yoke.  The  brushes  are  of  woven  wire,  self-adjusting — they  do  not  spark.  The 
bearings  are  of  hard  bronze,  nicely  fitted;  workmanship  throughout  the  best.  Finished  in  black 
enamel.  Fitted  with  1^-inch  grooved  pulley.  Length  of  shaft,  6  inches.  Weight,  9  pounds. 
Occupies  space  6x4%x6  inches.  At  speed  of  2200  r.  p.  m.,  the  output  is  36  Watts  (6  volts,  6 
amperes)  12.50 

HOT  PLATES,  see  general  heading  Hot  Plates. 

F3681.  INDUCTION  COIL,  with  adjustable  vibrator  or  interrupter,  commutator  and  condenser,  wound 
with  insulated  wire.  (The  coils  ordinarily  sold  are  French  coils  wound  with  bare  wire.) 
Mounted  on  finely  polished  mahogany  box. 

No A  B  C  D 

Spark  length,  mm 6  13  18  25 

Each  i 5.00  9.00  12.00  15.00 

F3665.  INDUCTION  COIL,  equipped  with  a  patented  mechanical  circuit  breaker,  which  is  mounted  in- 
dependently on  a  heavy  piece  of  enameled  slate.  This  makes  the  construction  very  rigid  and 
increases  the  efficiency  of  the  coil.  The  secondaries  are  built  in  sections  and  each  section  is 
wound  in  layers.  Three  special  means  of  adjustment  are  provided,  allowing  a  wide  range  of 
regulation,  so  that  the  coil  is  adapted  for  a  large  variety  of  work.  Complete  with  a  double 
pole,  double  throw  knife  switch.  The  150  mm  coil  will  produce  a  heavy  150  mm  spark  with 
an  input  of  4  volts,  6  amperes  (24  watts) ;  the  other  coils  take  a  proportional  input. 

No A                    B  C 

Spark  length,  mm 50                    75  150 

Each 30.00  40.00  75.00 

LAMPS,  Incandescent,  see  general  heading  Lamps. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


209 


No.  4496. 


No.  4512. 


METERS,  POCKET  D.  C. 


These  meters  are  of  the  permanent  magnet  type  and  are  extensively  used  for  rapidly  measuring  the 
polarity,  voltage  and  amperage  of  batteries.  They  are  exceedingly  dead  beat,  being  made  so  by  the 
relation  of  the  moving  system  to  the  magnetic  field  and  not  by  friction  or  air  vanes,  as  in  other  types. 
Each  instrument  is  packed  in  a  chamois  bag. 

4492.      AMMETER.     Range  0-30  amperes $1.00 

4494.      VOLTMETER.     Range  0-10  volts 1.00 

4496.      VOLT-AMMETER.     Range  0-15  volts  and  0-30  amperes 1.20 


METERS,  CENCO  DIRECT  CURRENT 

PORTABLE  TYPE. 

A  line  of  dependable  electrical  measuring  instruments  at  a  reasonable  price.  They  are  made  on  the 
D'Arsonval  Galvanometer  principle  with  a  rectangular  coil  of  wire  rotating  in  a  small  annular  gap  be- 
tween a  core  and  pole  pieces.  This  gap  is  traversed  by  a  concentrated  uniform  field  produced  by  a 
powerful  permanent  laminated  magnet.  The  current  is  carried  into  and  out  of  the  coil  by  means  of  non- 
magnetic springs.  The  moving  element  is  perfectly  balanced  between  .two  highly  polished  jewels.  The 
throw  of  the  coil  is  stopped  by  the  coil  striking  its  support.  This  prevents  the  bending  of  the  pointer 
and  the  destroying  of  the  calibration  of  the  instrument.  A  large  window  directly  over  the  moving 
system  shows  all  of  the  working  parts.  The  meter  is  enclosed  in  a  dust  proof  finely  finished  metal 
case  on  a  polished  mahogany  base.  Leads  are  brought  to  three  of  our  Cenco  binding  posts,  which  are 
recommended  for  their  convenient  size  and  from  the  fact  that  their  construction  will  not  allow  the 
knurled  nuts  to  be  lost. 

Ammeters,  voltmeters  and  volt-ammeters  can  be  furnished  in  the  ranges  listed  below.     In  each  in- 
strument the  calibration  is  guaranteed  to  1  per  cent,  of  the  full  scale. 
4504.   AMMETERS,  Cenco. 


No  

A 

B 

C 

Range,  amperes,  zero  to  

1 

10 

25 

Smallest  division,  amperes  

0.01 

0.1 

0.2 

Each  

12.00 

12.00 

15.00 

4506. 

AMMETER,  Cenco,  with  double  scale. 

Ranges,  0-12  amperes  in 

0.1  ampere 

divisions 

and  0-1.2 

amperes  in  0.01  ampere  divisions.  .  .  . 

..    $13.00 

4508. 

VOLTMETERS,  Cenco. 

No  

A 

B 

C 

D 

Range,  volts,  zero  to  

5 

10 

150 

250 

Smallest  division,  volts  

0.05 

0.1 

1.0 

2.0 

Each  

12.00 

12.00 

14.00 

15.00 

4510.  VOLTMETER,  Cenco,  with  double  scale.  Ranges,  0-150  volts  in  1  volt  divisions  and  0-7.5  volts 
in  0.05  volt  divisions 15.00 

4512.  VOLT-AMMETER,  Cenco,  combined  instrument  with  ranges  0-10  volts  and  0-10  amperes  in  0.1  unit 
divisions  12.00 


210 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Model  155. 


4524. 


4526. 


4532. 
4534. 


4546. 
4548. 
4550. 


4572. 


4574. 


Model  156. 


METERS,  IMPERIAL— ALTERNATING  CURRENT. 

METERS,  SWITCHBOARD.    Standard  electromagnet  construction,  hand  calibrated  scales,  which, 
as  iu  all  A.  C.  Meters,  cannot  be  used  with  great  accuracy  over  the  first  20  or  25  per  cent  of 
their  range.     Best  quality  jewel  and  pivot  bearings;   brass  case,  finished  in  baked  enamel  and 
dust  proof.     Diameter,  4  inches. 
AMMETEBS. 

No 

Eange,  amperes 

Smallest  division,  amperes 

Each 

VOLTMETERS. 


A 

1 

0.02 
$9.50 


B 

3 

0.05 
9.50 


C 
5 

0.1 
9.50 


D 
10 
0.2 
10.35 


E 
15 

0.25 
10.35 


F 

30 

0.5 

10.65 


No 

Range,  volts 

Smallest  division,  volts. 
Each  . 


A 

10 

0.2 

9.50 


B 

15 
0.25 
9.80 


C 
30 
0.5 
9.80 


D 

50 

1 

10.35 


E 

150 

2.5 

11.50 


F 

250 

5 

12.65 


METERS,   WESTON— ALTERNATING  CURRENT. 

METERS,  PORTABLE,  Model  155.  These  instruments  are  perfectly  dead  beat,  extremely  sensi- 
tive and  quickly  and  accurately  respond  to  the  most  minute  as  well  as  to  the  greatest  fluctua- 
tions in  current  strength,  or  in  potential  difference.  They  may  be  used  on  circuits  of  any 
frequency,  within  the  limits  of  engineering  practice  of  today,  without  sensible  error  in  their 
indications.  Provided  with  hardened  steel  pivots,  jeweled  bearings  and  mounted  in  neatly 
finished  dust-proof  wood  cases.  Dimensions  7x714x3%  inches. 

AMMETER,  0-10  amperes $21.25      4538.    VOLTMETER,  0-75    volts 23.15 

AMMETER,  0-25  amperes 21.25      4540.    VOLTMETER,  0-125  volts 23.15 

METERS,  SWITCHBOARD,  Model  156.  These  instruments  are  of  a  high  standard  of  excellence, 
indicate  the  same  whether  left  in  circuit  for  a  minute  or  permanently,  may  be  used  on  circuits 
of  any  ordinary  frequency,  are  entirely  dead  beat,  and  are  provided  with  a  remarkably  uniform 
scale.  Diameter  of  case,  7.25  inches;  depth  of  case,  3.15  inches. 

AMMETER,  0-10  amperes 16.90 

AMMETER,  0-25  amperes 16.90      4554.    VOLTMETER,  0-75    volts 18.15 

AMMETER,  0-50  amperes 17.20      4556.    VOLTMETER,  0-130  volts 18.15 

BOTH  ALTERNATING  AND  DIRECT  CURRENT. 

AMMETERS,  PORTABLE,  Model  370.  Instruments  are  of  the  electro-dynamometer  type,  which 
may  be  used  either  on  direct  current  circuits  or  on  alternating  current  circuits  of  any  frequency 
up  to  133  cycles  per  second.  Contained  in  polished  mahogany  boxes,  8x10*4x5%  in.,  with  carry- 
ing handles,  locks  and  covers.  (See  illustration  on  page  211.)  The  scales  are  5%  in.  long  and 
are  of  necessity  not  uniform  so  that  they  cannot  be  used  with  great  accuracy  over  the  first  20  or 
25%  of  their  range,  e.  g.,  the  10  ampere  scale  is  graduated  in  tenths  from  2  to  10  amperes  and 
this  range  covers  5  in.  of  the  length  of  the  scale.  Parallax  is  prevented  by  use  of  mirror  scale 
plates  and  knife  edge  pointers;  the  entire  coil  system  is  mounted  in  a  double  closed  iron  shield; 
the  pointer  responds  very  quickly  to  changes  in  the  applied  current;  the  instruments  are  not 
affected  by  ordinary  changes  in  external  temperature  and  are  free  from  working  errors;  and  an 
accuracy  of  14  of  1  per  cent,  of  the  full  scale  value  is  guaranteed  on  the  working  part  of  the 
scale.  For  both  Alternating  and  Direct  Current. 
MILLIAMMETERS,  single  range. 

No A  B  C  D 

Range,  mil-amperes 50  100  500  750 

Approx.  resistance,  ohms 167  26.5  1.2  0.9 

Each $84.40  84.40  84.40  84.40 

AMMETERS,  double  range. 

No 

Ranges,  amperes 


Each 


A 
2-1 

93.75 


B 

5-2.5 
93.75 


C 

10-5 
93.75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


211 


Model  370.     (See  page  210.) 


Model  341. 


Model  310. 


METERS,  WESTON— (CONTINUED). 

VOLTMETERS,  PORTABLE,  Model  341.  Those  instruments  are  of  the  same  general  description 
as  the  Model  370  Ammeters  described  on  page  210.  For  ordinary  measurements,  no  temperature 
corrections  are  necessary.  These  instruments  may  be  left  in  circuit  continuously,  but  all  ranges 
above  5  volts  are  provided  with  locking  contact  keys  by  means  of  which  the  circuit  may  be 
opened.  The  1,  1.5  and  5  volt  ranges  have  a  small  working  error,  but  on  the  higher  range  in- 
struments the  working  error  is  inappreciable.  For  both  Alternating  and  Direct  Current. 
4576.  VOLTMETERS,  single  range. 

No A  B  C  D  E  F 

Range,  volts 1  5  10  30  120  300 

Approx.  resistance,  ohms 2  18  66  470  2700         6700 

Each $81.25         81.25        78.15         75.00         75.00         78.15 

4578.    VOLTMETERS,  double  range. 

No A  B  C 

Ranges,  volts  15-1.5  120-60  300-150 

Approx.  resistance,  ohms 30-3  2700-1350         6700-3350 

Each 87.50  81.25  84.40 

WATTMETERS,  PORTABLE  SINGLE-PHASE,  Model  310.  These  instruments  represent  the  latest 
development  in  electro-dynamometer  wattmeters  and  have  the  same  general  description  as  the 
Model  370  Ammeter  described  on  page  210.  The  field  coils  are  designed  to  stand  double  their 
normal  capacity  continuously,  and  the  potential  circuits  a  voltage  of  1%  times  their  normal 
value.  A  reversing  switch  is  provided  by.means  of  which  the  direction  of  the  current  through 
the  movable  coil  may  be  changed  without  changing  the  direction  through  the  rest  of  the  poten- 
tial circuit.  This  makes  it  possible  to  obtain  a  positive  deflection  without  changing  connec- 
tions. The  scales  are  uniform  throughout  their  entire  length.  For  both  Alternating  and  Direct 
Current. 

4584.    WATTMETERS,   Single-phase,  double  voltage  and  current  ranges, 
volts,  but  will  stand  300  and  150  volts  without  any  damage. 


Rated  voltages  of  200  and  100 


No A  B  C  D  G 

Normal  amperes,  series 1  2.5  5  10  20  30  50 

Normal  amperes,  multiple 2  10  20  40  60  100 

Maximum  amperes,  series....          2  5  10  20  40  60  75 
Maximum  amperes,  multiple. .         4              10             20               40             80              120             150 
Kilowatts,  field  coils  in  series  0.2 /O.l     0.5/0.25     1/0.5            2/1           4/2             6/3            10/5 
Kilowatts,  field  eoils  in  mul- 
tiple    0.4/0.2       1/0.5         2/1             4/2           8/4           12/6           20/10 

No.  of  scale  lines 100  100          100  100  100  120  100 

Each 93.75        93.75         93.75         93.75        100.00        100.00        100.00 

WATTMETERS,  PORTABLE  POLYPHASE,  Model  329.  These  instruments  are  of  the  same  gen- 
eral design  as  the  Model  310  Single-Phase  Wattmeters,  but  are  larger,  the  dimensions  being 
0%xlO%x8  1/16  in.  Each  instrument  consists  of  two  single-phase  wattmeters,  electrically  inde- 
pendent, but  having  their  movable  coils  mounted  on  a  common  shaft  so  thf.t  they  rotate  together. 
4586.  WATTMETERS,  Two-phase,  double  voltage  and  current  ranges.  Rated  voltages  of  200  and  100 
volts,  but  will  stand  300  and  150  volts  without  any  damage. 


No. 

Normal  amperes,  series 

Normal  amperes,  multiple 

Maximum  amperes,  series 

Maximum  amperes,  multiple 

Kilowatts,  field  coils  in  series.  .  . 
Kilowatts,  field  coils  in  multiple. 

No.  of  scale  lines 

Each 


A 
1 

2 

2 

4 

0.6/0.3 
1.2/0.6 

120 
143.75 


B 

2.5 

5 

5 

10 

1.5/0.75 

3/1.5 

150 

143.75 


C 

5 
10 
10 
20 

3/1.5 

6/3 

150 

143.75 


D 

10 

20 

20 

40 

6/3 

12/6 

120 

150.00 


212 


OENTEAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


Model  1. 


Model  45. 


METERS,  WESTON  —(CONTINUED). 

DIRECT  CURRENT. 

METERS,  PORTABLE,  Model  45.    These  instruments  are  of  sufficient  accuracy  for  station  -work 
and  general  testing.     The  movement  is  completely  enclosed  in  an  iron  case   (which  protects  it 
from  stray  magnetic  fields),  securely  fastened  in  a  wooden  carrying  box.     This  box  is  provided 
with  a  hinge  cover  which  protects  the  scale  and  binding  posts. 
Kos.  4602-6  Meters  are  provided  with  self-contained  shunt. 
No.  4608  Meter  has  an.  external  shunt. 

4600.    MILLIAMMETER,  range  0-100  ma.  in  1.0  ma.  divisions $31.25 

4602.    AMMETER,  range  0-5  amperes  in  0.05  ampere  divisions 31.25 

4604.    AMMETER,  range  0-15  amperes  in  0.1  ampere  divisions 31.25 

4606.    AMMETER,  range  0-25  amperes  in  0.2  ampere  divisions 31.25 

4608.    AMMETER,  range  0-50  amperes  in  0.5  ampere  divisions 31.90 

4610.    MILLIVOLTMETER,  range  0-50  mv.  in  0.5  mv.  divisions 31.25 

4612.    VOLTMETER,  range  0-5  volts  in  0.05  volt  divisions 31.25 

4614.    VOLTMETER,  range  0-15  volts  in  0.1  volt  divisions 31.25 

4616.    VOLTMETER,  range  0-150  volts  in  1.0  volt  divisions 36.90 

NOTE. — Double  Scale  Voltmeters  of  the  above-  type  will  be  furnished  at  a  price  of  $6.25  in  addi- 
tion to  the  price  of  the  highest  range. 

METERS,  PORTABLE,  STANDARD,  Model  1.  These  meters  are  adjusted  and  calibrated  with  the 
greatest  care,  and  when  used  properly  give  exceedingly  accurate  results.  They  are  direct  read- 
ing, portable,  permanent,  and  ' '  dead  beat, ' '  and  are,  in  fact,  the  recognized  standard  instru- 
ments for  laboratory  and  general  testing. 

4626.    AMMETER,  range  15  amperes,  in  0.1  ampere  divisions,  readable  to  0.01  ampere 65.00 

4628.    AMMETER,  range  25  amperes,  in  0.25  ampere  divisions,  readable  to  0.025  ampere 65.00 

4630.    AMMETER,  range  50  amperes,  in  0.5  ampere  divisions,  readable  to  0.05  ampere 65.00 

4632.    MILLIVOLTMETER,  range  0-20  mv.  in  0.2  mv.  divisions,  readable  to  0.02  mv 50.00 

4634.    MILLIVOLTMETER,  zero  center,  range  10-0-10  mv.  in  0.2  mv.  divisions,  readable  to  0.02  mv.    50.00 
4636.    MILLIVOLTMETER,  zero  center,  double  range  10-0-10  and  100-0-100  mv.  supplied  with  key  by 

which  either  range  may  be  employed 55.00 

Any  of  the  above  MILLIVOLTMETERS  may  be  supplied  with  Shunts  for  ampere  readings  at  an 

additional  cost  of 5.00 

4638.    VOLTMETER,  range  150  volts  in  1  volt  divisions,  readable  to  0.1  volt 55.00 

4640.    VOLTMETER,  double  range,  150  volts  readable  to  0.1  volt  and  15  volts  readable  to  0.01  volts. 

75.00 

4642.    VOLTMETER,  same  as  No.  4640,  but  with  Reversing  Key 77.50 

METERS,  SWITCHBOARD,  Model  24.  These  small  round  pattern  meters  are  expressly  designed 
to  meet  the  demand  for  good  but  law  price  instruments  for  use  on  switchboards.  The  total 
diameter  of  the  front  is  6%  inches  and  the  total  depth  4  inches.  They  are  carefully  designed  to 
secure  the  highest  degree  of  durability  and  reliability;  they  are  absolutely  dead  beat,  and  their 
indications  can  be  relied  upon  within  1%.  The  cases  are  finished  in  black  japan  and  are  neat  in 
appearance. 

4652.    AMMETER,  0-10  amperes  in  .2  ampere  divisions 18.75 

4654.    AMMETER,  0-25  amperes  in  .5  ampere  divisions 19.40 

4656.    AMMETER,  0-50  amperes  in   1  ampere  divisions 19.70 

4658.    VOLTMETER,  0-10    volts  in  .2  volt  divisions 20.00 

4660.    VOLTMETER,  0-25    volts  in  .5  volt  divisions 20.00 

4662.    VOLTMETER,  0-50    volts  in   1  volt  divisions 20.00 

4664.    VOLTMETER,  0-130  volts  in  2  volt  divisions 20.65 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


213 


b 

No.  4671  (Vertical). 


4674. 


No.  4674  (Horizontal). 


No.  4683. 


No.  4687. 


No.  4674. 


METERS,  WESTON— (CONTINUED). 

METER,  LECTURE  TABLE,  D.  0. 

GALVANO-VOLT-AMMETER.      Combines    six    different 
electrical  measuring  instruments: 

(1)  Galvanometer. 

(2)  Milli- Voltmeter,  range  25-0-25  mv.  in  1  mv.  divisions. 

(3)  Mil- Ammeter,  range  25-0-25  ma.  in  1  ma,  divisions. 

(4)  Voltmeter,  range  5-0-5  volts  in  0.2  volt  divisions. 

(5)  Voltmeter,  range  125-0-125  volts  in  5  volt  divisions. 

(6)  Ammeter,  range  25-0-25  amperes  in  1  ampere  divisions. 
The  zero  is  in  the  center  of  the  scale  so  that  no  time  need 

be  wasted  in  determining  the  positive  terminal  of  a  cir- 
cuit. It  is  so  mounted  that  it  may  be  used  in  either  of 
THREE  POSITIONS — vertical,  horizontal,  or  inclined 
at  a  convenient  angle.  (These  positions  are  shown  in 
the  illustrations  above.)  The  working  parts  are  fully  exposed  to  view  and  all  connections  may 
readily  be  traced.  It  is  an  extremely  sensitive  instrument,  and  having  no  suspensions,  mirrors 
or  adjustments  to  get  out  of  order,  is  always  ready  for  use.  Among  many  uses  are  the  following: 
The  MEASUREMENT  OF  VOLTAGE,  AMPERAGE  AND  RESISTANCE  OF  BATTERIES;  the 
DETERMINATION  OF  RESISTANCE,  CONDUCTIVITY,  etc.,  of  the  various  metals;  the 
MEASUREMENT  OF  THE  THERMO-ELECTRIC  EFFECTS  of  different  metals;  as  a  CUR- 
RENT INDICATOR  IN  WHEATSTONE  BRIDGE  WORK;  and  as  a  LECTURE  TABLE  GAL- 
VANOMETER    $40.00 


No.  4686. 


METERS,  LECTURE  TABLE,  D.  C. 

4682.  AMMETER,  with  zero  at  left  of  seal?,  mounted  vertically  in  a  dust-proof  case,  for  demonstration 

work.     Very  sensitive,  and  always  ready  for  use.     Range  0-1  ampere  in  0.01  ampere  divisions. 
." ." '. 27.50 

4683.  EXTRA  SHUNT,  to  make  No.  4682  read  0  to  10  amperes  in  0.1  ampere  divisions 5.00 

4686.  VOLTMETER,  same  style  and  mounting  as  No.  4682.      Range  0-4  volts  in  0.05  volt  divisions. 

" 27.50 

4687.  EXTRA  COIL,  to  make  No.  4686  read  from  0  to  120  volts  in  1.5  volt  divisions 5.00 


214 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  4716. 


Nos.  4730-1  (F-O). 


MOTORS 

4716.  MOTOR,  Porter  Battery  No.  1.     A  standard  article,  perfect  in  every  detail  of  design  arid  con- 

struction, and  accurately  made.     Nicely  finished  in  black  enamel.     1/100  h.  p.,  1.5-3  volts,  1.5 
amperes,  5500  r.  p.  m.;  size,  3^x3 l/4,x3%  inches;  weight,  1%  Ibs $4.00 

4717.  MOTOR,  Porter  Battery  No.  2.     Same  as  No.  4716,  but   1/90  h.  p.,  3-5   volts,   2   amperes,  4000 

r.  p.  m.;  size,  3%x4x4%  inches;  weight,  2%  Ibs 7.00 

4720.  MOTOR,  Universal.  This  motor  may  be  used  on  110  volt  either  Alternating  (60  cycle)  or  Direct 
Current.  Will  develop  approximately  1/50  h.  p.,  is  efficient  and  will  not  heat  up  when  oper- 
ating on  either  circuit.  It  is  constructed  in  a  substantial  manner,  having  laminated  fields  and 
armature  and  a  twelve-section  copper  commutator.  It  uses  a  ^g-inch  carbon  brush  and  is 
equipped  with  compression  grease  cups  and  bronze  bearings  which  insure  perfect  lubrication. 
It  weighs  4%  pounds,  is  5  inches  high  and  consumes  .about  the  same  amount  of  current  as  one 
8  candle  power  lamp 8.00 

4724.  BATTERY  RHEOSTAT,  for  regulating  the  speed  of  small  motors,  and  also  for  use  with  minia- 
ture battery  lamps.  This  rheostat  is  nicely  finished  with  nickel  trimmings  and  rubber  handle. 
Resistance,  0  to  5  ohms 1.40 

MOTORS,    Alternating    Current,    Single    Phase,  60  Cycle.     These  General  Electric  A.  C.  Power 
Motors  are  of  the  Split  Phase  Induction  Type  for  constant  speed  and  continuous  service. 


No  ......................... 

H.  P  ....................... 

Speed,  r.  p.  m  .............. 

Diameter  of  pulley,  inches... 
Width  of  pulley  face,  inches.. 
Shipping  weight,  Ibs  ........ 

4730.  MOTORS,  110  volts  .........  Each 

4731.  MOTORS,  220  volts  .........  Each 


B 


D 


E 


1725 


1140          1725          1140          1725 

1%  1%  1%  1%  1% 

Grooved  for  %-in.  round  belt. 
24  27  27  28  28 


25.85 
26.95 


26.95 
28.05 


26.95 
28.05 


30.80 
31.90 


30.80 
31.90 


1140 
2% 
1% 
41 

41.80 
42.90 


G 

V* 

1725 
2% 

1% 

41 

41.80 
42.90 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


215 


No.  4736. 


No.  4746. 


No.  4756-7  (A-F). 


4734.  MOTORS,  Alternating  Current,  Single  Phase,  60  Cycle.  These  General  Electric  A.  C.  Power 
Motors  are  of  the  Repulsion  Induction  Type  for  constant  speed  and  continuous  service.  They 
are  so  built  that  they  may  be  used  on  either  110  volt  or  220  volt  current.  This  type  of  motor 
requires  less  starting  current  than  the  Split  Phase  Induction  Type  and  its  use  is  required  by 
some  central  power  stations. 


No A  B  C 

H.  P %  %  % 

Speed,  r.  p.  m 1725  1140  1725 

Diameter  of  pulley,  inches...  2  2%  2% 

Width  of  pulley  face,  inches..  Grooved  1  1 

Shipping  weight,  Ibs ?.2  40  40 

Each $39.60  52.80  50.60 


D 

U 
1140 

3% 
2 

55 
67.10 


£ 

% 

1725 
3% 

2 

55 
62.70 


1140 

3^ 

2 

80 
80.30 


1725 

3% 

2 

80 
79.20 


4736.  MOTORS,  Alternating  Current,  Single  Phase,  60  Cycle.  These  General  Electric  A.  C.  Power  Motors 
are  of  the  repulsion  induction  type  especially  adapted  to  loads  requiring  heavy  starting  torque 
and  have  the  same  high  operating  characteristics  as  a  D.  C.  Compound  Motor.  They  are  pro- 
vided with  sliding  base  as  shown  in  illustration  above.  They  can  be  used  on  either  110  or  220 
Volt,  60  Cycle,  Alternating  Current. 

Xo.    .                              ...................  A  B                   C  D  E 

H.  P  .................................  1  1  1%  2  2 

Speed,  r.  p.  m  .........................  1890  1200  1800  1800  1200 

Diameter  of  pulley,  inches  ...............  4%  4%  4^  4%  4>A 

"Width  of  pulley  face,  inches  ............  222 

Shipping  weight,  Ibs  ...................  160  175                185  175  215 

Each  .................................  102.30  123.20  117.70  134.20  166.10 


4746. 


MOTORS.  Alternating  and  Direct  Current,  General  Electric.  The  application  of  small  power 
notors  in  industrial  and  domestic  lines  has  increased  to  such  enormous  extent  that  small 
motors,  of  exceptional  quality  and  lightness,  are  now  available  at  low  prices.  They  are  series 
wound  for  continuous  service,  and  will  not  develop  an  excessive  speed  when  the  entire  load  is 
thrown  off.  The  A.  C.  motors  operate  on  110  volts  60  cycles,  and  will  also  operate  on  110  volt 
direct  current.  The  D.  C.  motors  will  operate  only  on  110  volt  direct  current. 

Xo  ............................  A           B  C  D           E           F  G  H 

H.P  ..........................  %oo  ^oo  Moo  Moo  %o         %o  %»  %s 

Current    ......................  A.C.  D.C.  A.C.  D.C.  A.C.  D.C.  A.C.  D.C. 

Speed,  r.  p.  m  ..................  2200  2200  2200  2200  1800  1800  1800  1800 

Diam.  of  V-groove  pulley,  inches,  %            %  %  %  1%  1%  1%  1% 

Shipping  weight,  Ibs.  ..'  ........  10           10  10  10           15           15  24  24 

Each  ..........................  11.30  11.55  12.65  12.65  15.15  15.70  18.70  19.00 

MOTORS,  Direct  Current,  General  Electric.  For  constant  speed  and  continuous  service.  Xos.  A 
to  D  are  shunt  wound;  the  others  eompo-_nd  wound. 


E 


H 


No A     B     C  D 

H.p Ho   i^,  V>o  Mo   M"    %    %    %    %    %    % 

Speed',  r.  p.m.. .  1140   1725  1140  1725   1140   1725   1140   1725   1140   1725   1140 
Diam.  of  pulley, 

inches .'.  1M        IVi  las  1%          1%        1%        2%       2%        3%        3%         3% 

Width  of  pulley 

face,  inches..'.              Grooved  for  *4 -inch  round  belt.  iy4       1>4           2  2            2. 
Shipping  weight, 

Ibs 24          24  24  24           24          24          28          28          50          50          51 

4756.  MOTORS,  110  volts. 

Each 20.90     20.90     23.10     23.10      25.85     25.85     35.20     35.20     64.90     64.90     79.20 

4757.  MOTORS.  220  volts. 

Each     22.00     22.00     24.20     24.20      26.95     26.95     36.30     36.30     66.00     66.00     80.30 


216 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  4760-1. 


No.  4814. 


No.  4816. 


4760. 
4761. 


4772. 
4773. 


4776. 
477/. 
4810. 


4814. 


4816. 


No.  4810. 


Nos.  4772-4777. 


MOTORS,  Direct  Current,  General  Electric.  These  D.  C.  Power  Motors  are  compound  wound,  con- 
stant speed,  continuous  service,  Oil  Ring  Bearing  Type,  complete  with  no  voltage  release  start- 
ing rheostat,  sliding  base  and  standard  pulley  of  4% -inch  diameter  and  2-inch  face. 

No i A  B  C  D  E 

H.  P %  %  I  1  2 

Speed,  r.  p.  m 1700  1150  1700  1150  1700 

Shipping  weight,  Ibs 120  130  130  170  170 

MOTORS,  110  volts Each  $71.50  85.80  79.20  93.50  102.30 

MOTORS,  220  volts Each    71.50  85.80  79.20  93.50  103.40 

Series  wound  for  1800  r.  p.  m.  at  the  rated  H.  P.      Speed  varies 


A 

Kp 

12 

14.40 
15.00 


B 

M2 
14 

14.40 
15.00 


Shunt  wound,  for  1800  r.  p.  m. 


Speed  independent  of  load. 
ABC 

%o  Vi2  % 

12  14  17 

14.40  14.40  17.00 

15.00  15.00  18.50 


MOTORS,  Direct  Current,  Cenco. 
with  load. 

No 

H.  P 

Net  weight,  Ibs 

MOTOR,  110  volts 

MOTOR,  220  volts 

MOTORS,  Direct  Current,  vCenco. 

No 

H.  P 

Net  weight,  Ibs 

MOTOR,  110  volts 

MOTOR,  220  volts 

COUNTERSHAFT  *4  inch  in  diameter  and  12  inches  long,  with  bearings  and  pulleys  1,  2,  3  and 
4  inches  in  diameter.  The  pulleys  are  bored  and  grooves  turned  true  with  the  shaft,  to  which 
they  are  fastened  with  set  screws,  so  that  their  position  on  the  shaft  may  be  changed.  Used  in 
connecting  small  engines  and  motors  with  other  machinery 2.40 

SPEED  REDUCING  GEAR.  An  improved  device  by  which  the  high  speed  of  an  engine  or  motor 
is  converted  into  a  slow,  powerful  motion.  The  round  plate  may  be  removed,  if  desired,  and 
direct  connection  made  to  shaft.  Geared  48  to  1.  Pulleys  grooved  for  %.>-inch  round  belt.  The 
fast  running  pulley  has  diameters  2,  3  and  4  inches,  and  the  slow  running  pulley  diameters 
2  and  4  inches,  thus  giving  a  wide  range  of  speeds  7.20 

SPEED  REDUCING  GEAR.  Similar  to  No.  4814,  but  with  the  gear  enclosed  in  a  case  which  la 
filled  with  grease  so  that  the  gear  will  run  silently  and  without  attention  for  a  long  time. 
Geared  48  to  1.  Pulleys  grooved  for  %2-inch  round  belt.  The  fast  running  pulley  is  4  inches 
in  diameter  and  the  slow  running  pulley  has  diameters  1,  1%,  2  and  2%  inches,  thus  giving  a 
wide  range  of  speed 10.80 

For  other  MOTORS  in  addition  to  those  listeJ,  see  Nos.  2361,  2362,  2398  and  2399. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


217 


Nos.  4824-4837. 


MOTOR  GENERATORS 

A.  C.  to  D.  C. 

DIBECT  CURRENT  NOW  AVAILABLE  WHEREVER  THERE  ARE 

ALTERNATING  CURRENT  MAINS. 

FEATURES. 


Generator  shunt  wound. 

Generator  and  Motor  armatures  mounted  on 
same  shaft. 

Motor  has  revolving  primary  and  is  well  ven- 
tilated. 

Radial  brushes  set  on  neutral.  Cartridge  type 
brushholders  used. 

No  sub-base  required.  Sets  may  be  bolted 
direct  to  support. 


Use    of   two-bearing    construction    makes    set 

compact  and  efficient. 
Generous    size    bearings   equipped   with    ring 

oilers. 
Heavy  four  arm  bearing  flanges  with  ample 

ventilating  duets. 

Four  thru  bolts  hold  parts  firmly  together. 
The  voltage  chosen  may  be  varied  25%  above 

and  below  normal  rating  by  means  of  the 

Field  Rheostat  furnished  with  each  set. 


No  starting  box  needed. 
Useful  for  Battery  Charging. 

MOTOR  GENERATORS,  A.  C.  to  D.  C.     "With  single  phase,  60-cycle  Motor,  and  Generator  wound 
for  6,  12,  18  or  24  volts  D.  C.     (State  voltage  desired  when  ordering.) 

No A  B  C  D 

Output,  watts 50  100  175  250 

Shipping  weight,  Ibs 49  69  90  155 

4824.  MOTOR  GENERATORS,  with  110  volt  motor $59.40  68.20  85.80  137.50 

4825.  MOTOR  GENERATORS,  with  220  volt  motor 60.50  69.30  86.90  138.60 

MOTOR  GENERATORS,  A.  C.  to  D.  C.     With  single  phase,  60-cycle  Motor,  and  Generator  wound 

for  60,  125  or  250  volts  D.  C.  .  (State  voltage  desired  when  ordering.) 

No A                 B                  C  D  E 

Output,  watts 100              175               250  375  500 

Shipping  weight,  Ibs 69                90               155  160  165 

4828.  MOTOR  GENERATORS,  with  110  volt  motor.      62.70           82.50           123.20  155.10  172.70 

4829.  MOTOR  GENERATORS,  with  220  volt  motor.      63.80           83.60           124.30  156.20  173.80 
NOTE:  Motors  for  other  frequencies  may  be  obtained  at  a  slight  advance  in  price. 

D.  C.  to  D.  C. 

Sets  with  the  same  features  as  those  described  above  are  listed  for  service  on  110  or  220  volts  Direct 
Current. 

MOTOR  GENERATORS,  D.  C.  to  D.  C.     With  direct  current  Motor,  shunt  wound,  and  Generator 
wound  for  6,  12,  18  or  24  volts  D.  C.     (State  voltage  desired  when  ordering.) 


4832. 
4833. 


4836. 
4837. 


No. 

Output,  watts 

Shipping  weight,  Ibs 

MOTOR  GENERATORS,  with  110  volt  motor. 
MOTOR  GENERATORS,  with  220  volt  motor. 


A 

50 

49 

50.60 
51.70 


B 

100 
69 

61.60 
62.70 


C 
175 

90 

80.30 
81.40 


D 

250 

155 
132.00 
133.10 


MOTOR  GENERATORS,  D.  C.  to  D.  C.     With  direct  current  Motor,  shunt  wound,  and  Generator 
wound  for  60,  125  or  250  volts  D.  C.     (State  voltage  desired  when  ordering.) 

No A                 B                  C  D  E 

Output,  watts 100              175               250  375  500 

Shipping  weight,  Ibs 69                 90                loo  160  165 

MOTOR  GENERATORS,  with  110  volt  motor.      57.20           75.90           117.70  146.30  167.20 

MOTOR  GENERATORS,  with  220  volt  motor.      58.30           77.00           118.80  147.40  168.30 

For  MOTOR  GENERATORS  with  Switchboard  see  next  page. 


218 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  4842-4848. 

MOTOR  GENEEATOES  with  Switchboard.  These  motor  generators  will  meet  the  demand  for  a 
self  contained  outfit  for  the  laboratory,  which  may  be  used  to  furnish  the  regular  laboratory 
current  and  is  especially  valuable  for  battery  charging.  The  outfits  consist  of  a  Motor  Generator 
Set  of  the  type  described  on  page  217,  with  the  generator  for  from  24  to  72  volts  D.  C.,  depend- 
ing on  the  output,  and  a  steel  switchboard  panel,  mounted  as  in  the  illustration  and  having  the 
following 

FEATUEES. 

Voltmeter  for  reading  voltage. 

Push  button  to  be  pushed  when  reading  voltmeter. 

Snap  switch  for  closing  and  opening  battery  circuit. 

Ammeter  for  reading  charging  current. 


Rheostat  for  adjusting  charging  current. 
Snap  switch  in  line  circuit  for  starting 

and  stopping. 
Field  rheostat  for  adjusting  voltage. 


The  field  rheostat  will  reduce  the  voltage  of  any  set  to  25  per  cent  of  its  normal  rating,  but  the 
charging  rate  used  must  not  exceed  the  ampere  rating  marked  on  the  generator  name*plate. 

No A  B  C  D  E 

Output,  watts 175  250  375  500  750 

Voltage  of  generator 24  24  36  48  72 

Shipping  weight,  Ibs 105  170  175  180  200 


4842.    MOTOE   GENEEATOES,    with    110    volt,    A. 

C.,  single  phase,  60-cycle  motor $115.50 


169.40          201.30          218.90          255.20 


4844.    MOTOE   GENEEATOES,    with   220    volt,    A. 

C.,  single  phase,  60-cycle  motor 116.60 


170.50          202.40          220.00          256T30 


4846.    MOTOE  GENEEATOES,  with  110  volt,  D.  C., 

shunt  wound  motor 111.10 


160.60          193.60          213.40 


4848.    MOTOE  GENEEATOES,  with  220  volt,  D.  C., 
shunt  wound  motor  . 


112.20 


161.70 


194.70 


214.50 


NOTE:     Nos.  4842-4  B,  C,  D  and  E  can  be  furnished  with  three-phase  motors  for  5  per  cent,  more 
than  the  above  prices. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


219 


4867. 
4868. 
4870. 


No.  4866. 

OVENS,  see  general  heading  Ovens. 

RADIOACTIVITY  APPARATUS,  see  general  heading  Radioactivity  Apparatus. 

RECTIFIERS 

4866.  RECTIFIER,  ELECTROLYTIC,  or  NODON  VALVE.  Consists  of  four  cells  with  electrodes  of  lead 
and  aluminum,  and  depends  for  its  action  on  the  fact  that  an  electric  current  will  not  enter  the 
electrolyte  from  the  aluminum  electrode,  but  will  pass  freely  into  the  electrolyte  from  the  lead. 
The  electrodes  are  fastened  to  a  substantial  non-conducting  top,  with  binding  posts  for  both 
A.  C.  and  D.  C.  circuits.  The  connections  are  made  by  straps  of  metal,  so  that  the  path  of  the 
current  is  readily  traced. 

This  valve,  though  not  as  satisfactory  as  a  Motor  Generator,  may  be  used  on  either  110  or  220-volt 
alternating  circuit  with  a  moderately  high  efficiency.  Currents  of  from  5  to  8  amperes  may  be 
obtained  for  laboratory  use,  and  for  short  periods  of  time,  much  larger  currents  may  be  drawn 

from  the  valve.     Complete  with  chemicals,  glass  jars,  and  full  directions $19.00 

CHEMICALS  for  No.  4866,  per  complete  charge 50 

GLASS  JAR  for  Xo.  4866,  for  replacements 40 

RECTIFIERS,  TUNGAR.  These  rectifiers  consist  of  a  bulb  filled  with  an  inert  gas  at  low  pres- 
sure and  having  for  cathode  a  filament  of  small  tungsten  wire  coiled  into  a  closely  wound  spiral 
and  for  anode  a  piece  of  graphite  of  relatively  large  cross  section.  The  tungsten  filament  is 
heated  to  incandescence  by  being  placed  in  the  secondary  circuit  of  a  transformer,  which  is 
part  of  the  outfit.  This  incandescent  filament,  as  is  well  known,  emits  electrons  and  ionizes 
the  rarified  gas  in  the  bulb,  which  thus  becomes  a  conductor  of  electricity.  In  addition  to  be- 
ing in  the  secondary  circuit  of  the  transformer,  the  tungsten  filament  is  connected  to  one  ter- 
minal of  the  A.  C.  line  and  the  graphite  electrode  to  the  other  terminal.  During  the  half -cycle 
in  which  the  filament  is  negative,  the  electrons  being  themselves  negative  are  driven  from  the 
filament  and  across  to  the  graphite  positive  electrode,  ionizing  the  gas  molecules  as  men- 
tioned above  and  permitting  the  passage  of  a  current.  During  the  other  half  of  the 
cycle  when  the  filament  is  positive,  if  any  electrons  are  emitted,  they  are  immedi- 
ately attracted  to  the  filament  again,  so  that  the  gas  remains  non-conducting.  Since  the  direc- 
tion of  a  current  is  opposite  to  the  direction  in  which  the  negative  electrons  travel,  it  is  evident 
that  the  current  passes  during  each  alternate  half -cycle  from  the  graphite  electrode  to  the  tung- 
sten filament  through  the  bulb.  We  therefore  have  in  the  circuit  of  the  bulb  a  pulsating  uni- 
directional current. 
This  current  is  especially  adapted  to  battery  charging  but  may  be  used  for  many  other  purposes 

such  as  in  electrolytic  experiments,  electro-plating,  for  running  small  motors,  etc. 
Tungar  Rectifiers  are  designed  for  115  volt,  60-cycle  circuit,  but  may  be  used  on  from  105  to  125 
volt  circuit.  They  are  mounted  in  a  black  japanned  casing,  with  a  perforated  top.  This  cas- 
ing contains  the  bulb,  the  transformer  and  a  fuse  to  protect  against  overloads.  These  rectifiers 
are  especially  superior  to  many  rectifiers  or  the  market  in  that  they  operate  satisfactorily  when 
only  a  fraction  of  their  full  output  is  being  used.  Nos.  A  and  B  are  provided  with  legs  for 
placing  on  floor  or  table;  No.  C  is  intended  for  wall  installation,  and  is  provided  with  ammeter. 
Furnished  with  cord  and  plug  for  attachment  to  any  incandescent  lamp  socket. 


No. 


Output,  full  load,  watts.  . .  . 

Amperes,  full  load 

Volts,  full  load 

Height,  inches 

Depth,  inches 

Width,  inches 

Shipping  weight,  Ibs 

Each 

4871.  TUNGAR  BULB  only,  renewal. 


A 

15 

2 

7.5 
8'4 
5% 
6% 

12 
16.00 

3.00 


B 
90 
6 
15 
10 
8 

6% 

24 

24.00 

7.00 


C 
450 

6 
75 
14 
12% 


81 

115.00 
8.00 


220 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  F4701. 


No.  F4703. 


RESISTANCE  BOXES  AND  WHEATSTONE  BRIDGES 

In  the  construction  of  our  resistance  boxes  we  use  high  grade  rubber  plates  for  the  tops,  of  sufficient 
thickness  to  insure  a  firm  anchorage  for  the  brass  bars,  and  the  best  obtainable  wire. 

All  coils  are  wound  bifilar  in  uniform  layers  and  are  practically  free  from  inductance  and  capacity 
so  that  any  of  the  boxes  may  be  used  in  conductivity  experiments  with  alternating  currents.  The  coils 
are  securely  fastened  to  the  top,  so  that  there  is  no  danger  of  the  spools  breaking  loose  and  destroying 
the  connections. 

Our  plugs  are  provided  with  knurled  hard  rubber  tops  moulded  on,  which  prevents  removal.  The 
plugs  are  carefully  fitted,  giving  good  contacts,  and  are  placed  sufficiently  far  apart  to  insure  easy 
manipulation.  The  brass  blocks  are  heavy  and  separated  so  that  the  insulation  between  may  be  cleaned. 

We  guarantee,  without  reservation,  all  our  boxes  to  be  accurate  within  the  per  cent,  claimed,  and 
any  boxes  will  be  replaced  that  show  faulty  construction  or  do  not  come  up  to  the  guaranteed  accuracy 
when  compared  with  reliable  standards. 

F4701.  RESISTANCE  BOX,  Spring  Contact  Design.  The  greatest  objection  to  the  plug  form  resistance 
box,  when  used  by  inexperienced  workers,  is  the  unreliability  of  the  contacts,  caused  either  by 
the  loosening  of  the  adjoining  plugs  when  one  is  withdrawn  or  by  a  loose  fit,  caused  either  by 
exchange  or  failure  to  properly  insert  the  plugs.  As  will  be  noticed  in  the  above  illustration, 
these  dangers  have  been  obviated  by  the  use  of  the  spring  contact,  which,  on  account  of  the 
taper,  fits  tightly  all  points  of  the  plug,  causing  no  irregular  wear.  The  external  resistance  of 
the  box  has  not  been  materially  increased.  The  total  resistance  is  111  ohms,  divided  as  follows: 
0.1,  0.2,  0.3,  0.4,  1,  2,  3,  4,  10,  20,  30  and  40  ohms.  The  coils  are  guaranteed  accurate  to  1%. 
§10.00 

F4703.  RESISTANCE  BOX,  Standard  Design,  for  individual  student  use.  We  believe  this  box  will  be 
found  to  be  superior  to  any  sold  at  an  equal  price.  The  total  resistance  is  111  ohms,  divided 
as  follows:  0.1,  0.2,  0.3,  0.4,  1,  2,  3,  4,  10,  20,  30  and  40  ohms.  The  coils  are  guaranteed  accu- 
rate to  %  of  1%.  For  detailed  description  of  construction,  see  above 12.00 

F4704.  RESISTANCE  BOX,  same  as  No.  F4703,  but  with  guaranteed  accuracy,  %% 15.00 

F4705.  RESISTANCE  BOX,  same  as  No.  F4703,  but  with  total  resistance  of  1,111  ohms,  divided  as  fol- 
lows: 1,  2,  3,  4,  10,  20,  30,  40,  100,  200,  300,  400  ohms.  Guaranteed  accuracy,  %% 17.50 

F4711.  RESISTANCE  BOX,  Standard  Design,  with  traveling  plugs.  The  blocks  are  of  new  and  im- 
proved form,  which  enables  the  coils  to  be  held  more  firmly  in  position,  and  lessens  the  danger 
of  imperfect  contact  between  coils  and  blocks.  The  traveling  plugs  add  greatly  to  the  useful- 
ness of  the  instrument,  making  it  available  for  the  comparison  of  the  E.  M.  F.  of  batteries 
and  other  tests  by  the  potentiometer  method.  The  total  resistance  is  1,111  ohms,  as  follows: 
0.1,  0.2,  0.3,  0.4,  1,  2,  3,  4,  10,  20,  30,  40,  100,  200,  300  and  400.  For  detailed  description  of  con- 
struction see  above.  Guaranteed  accuracy,  %%  45.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  S.  A. 


221 


NO.  F4719. 


F4713.  EESISTANCE  BOX,  same  as  No.  F4711,  but  with  total  resistance  11,110  ohms,  as  follows:  1,  2,  3, 
4,  10,  20,  30,  40,  100,  200,  300,  400,  1000,  2000,  3000  and  4000 $45.00 

F4719.  RESISTANCE  BOX,  Dial  Decade  Design.  A  3-dial  resistance  box  having  a  total  resistance  of 
1110  (  =  10x1  +  10x10+10x100)  ohms,  mounted  in  a  mahogany  finished  hardwood  box,  with 
hard  rubber  top  about.  15x40  cm.  Contact  with  the  blocks  at  the  end  of  the  swinging  arm  is 
made  by  a  multiple  brush  with  ends  bent  so  that  they  are  not  tangent  to  the  circle  in  which 
they  move  and  therefore  do  not  wear  rings  in  the  blocks.  The  coils  are  of  the  same  descrip- 
tion as  those  used  in  our  other  resistance  boxes  (see  page  220),  and  are  guaranteed  to  %  of 
1%  45.00 

RESISTANCE  BOXES,  Dial  Decade  Design.  High  grade  hard  rubber  top,  mounted  in  a  wood 
case,  or,  if  preferred,  in  a  perforated  metal  case  so  that  the  coils  may  cool  rapidly  or  be  im- 
mersed in  oil  to  give  extra  large  current  carrying  capacityi  The  dials  may  be  rotated  in  either 
direction  continuously,  the  dial  switches  make  thoroughly  reliable  contact  and  the  brushes  are 
set  so  that  they  do  not  wear  rings  in  the  blocks.  Guaranteed  accuracy  1/10  per  cent. 

No A 

No.  of  dials 3 

Smallest  resistance,  ohms 10 

Total  resistance,   ohms 11,100 

F4721.  EESISTANCE  BOXES,  in  wood  case $80.65 

F4722.  EESISTANCE  BOXES,  in  metal  case 80.65 


B 

C 

D 

4 

4 

5 

0.1 

1 

0.1 

1,111 

11,110 

11,111 

106.25 

106.25 

125.00 

106.25 

106.25 

125.00 

222 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  F4733. 


No.  F4731. 


F4725.  MEGOHM  BOX,  Standard,  with  five  groups  of  coils  of  200,000  ohms  each.  Six  pillars,  well  in- 
sulated, are  used  on  a  hard  rubber  top,  there  being  200,000  ohms  between  each  pair  of  pillars. 
There  is  a  double  contact  post  on  top  of  each  pillar,  so  that  these  can  be  connected  together 
with  copper  links.  In  finely  finished  hardwood  box $187.50 

F4727.  TENTH-MEGOHM  BOX,  Standard.  In  four  units  of  10,000,  20,000,  20,000  and  50,000  ohms.  An 
infinity  plug  separates  each  coil  from  the  one  next  to  it.  Segments  are  insulated  by  hard  rub- 
ber above  the  hard  rubber  top  in  order  to  increase  the  insulation.  In  finely  finished  hardwoo:! 
box  62.50 


WHEATSTONE  BRIDGES  AND  POTENTIOMETERS 

F4731.  RESISTANCE  BOX  and  WHEATSTONE  BRIDGE  Combined.  Polished  hardwood  mahogany 
finished  box  with  hard  rubber  top  %-inch  thick.  Heavy  brass  blocks  of  new  design  (see  No. 
F4711)  are  used.  For  other  details  of  construction,  see  page  220.  The  bridge  coils  are  six  in 
number,  1,  K)  and  100  ohms  on  each  side.  The  rheostat  coils  are  twelve  in  number,  viz:  1,  2, 
3,  4,  10,  20,  30,  40,  100,  200,  300,  400  ohms.  The  total  range  of  measurement  is  therefore  from 
0.01  to  111,000  ohms.  The  binding  posts  for  battery,  galvanometer,  and  unknown,  and  keys 
with  platinum  contacts  for  battery  and  galvanometer  are  conveniently  placed,  and  all  hidden 
connections  are  clearly  indicated  by  lines  on  the  top  of  the  box.  Guaranteed  accuracy,  %%.  40.00 

F4733.  RESISTANCE  BOX  and  WHEATSTONE  BRIDGE  Combined.  An  exceptionally  high  grade  box 
of  the  finest  materials  and  first  class  workmanship.  The  blocks  are  of  new  and  improved  de- 
sign (see  No.  F4711),  and  the  other  details  of  construction  are  as  described  on  page  220.  The 
rheostat  coils  are  sixteen  in  number,  viz:  1,  2,  3,  4,  10,  20,  30,  40,  100,  200,  300,  400,  1000,  2000, 
3000,  4000  ohms.  The  bridge  coils  are  eight  in  number,  1,  10,  100  and  1000  ohms  on  each  side. 
The  total  range  of  measurement  is  therefore  from  0.001  to  11,110,000  ohms.  The  binding  posts 
for  battery,  galvanometer,  and  unknown,  and  keys  with  platinum  contacts  for  battery  and 
galvanometer  are  conveniently  placed,  and  all  hidden  connections  are  clearly  indicated  by 
lines  on  the  top  of  the  box.  Has  two  traveling  plugs.  Guaranteed  accuracy,  1/io%  •  •  •  •  55-00 

F4739.  BRASS  PLUG,  with  knurled  rubber  top,  as  used  on  our  Resistance  Boxes 26 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A 


No.  F4853. 

No.  F4749. 

DIAL  WHEATSTONE  BRIDGES.  No- 

F4741.  WHEATSTONE  BRIDGE,  Dial  Decade  Design.  Similar  in  construction  to  Nos.  F4721  Dial  Re- 
sistance Boxes  listed  on  page  221.  Has  six  ratio  coils,  one  each  1,  10,  100,  100,  1,000  and  10,000 
ohms,  adjusted  to  an  accuracy  of  1/25  per  cent.  The  rheostat  has  four  dials,  giving  10x1,  10x10, 
10x100  and  10x1,000  ohms,  a  total  of  11,110  ohms,  and  is  adjusted  to  an  accuracy  of  1/10  per 

cent $131.25 

F4742.  WHEATSTONE  BRIDGE.     Same  as  No.  F4741,  but  with  ten  ratio  coils,  two  each  1,  10,  100, 

1,000  and   10,000  ohms 137.50 

F4743.  WHEATSTONE  BRIDGE.     Same  as  No.  F4741,  but  with  five  dial  rheostat,  giving  10x0.1,  10x1, 

10x10,  10x100  and  10x1,000  ohms,  a  total  of  11,111  ohms 150.00 

F4744.  WHEATSTONE  BRIDGE.     Same  as  No.  F4742,  but  with  five  dial  rheostat,  giving  10x0.1,  10x1, 

10x10,  10x100  and  10x1,000  ohms,  a  total  of  11,111  ohms 156.25 

F4749.  TESTING  SET,  Portable.  A  compact  and  reliable  self-contained  instrument,  including  Wheat- 
stone  bridge  with  rheostat,  galvanometer,  battery  and  necessary  switches.  The  ratio  arms  of 
the  Wheatstone  bridge  are  of  the  plug  type  and  include  four  coils  in  each  arm,  1,  10,  100  and 
1,000  ohms.  The  rheostat  is  of  the  dial  decade  type  with  four  dials,  units,  10  's,  100 's  and 
1,000 's,  giving  a  total  resistance  of  11,110  ohms.  The  rheostat  switches  may  be  revolved 
continuously  in  either  direction  and  the  contacts  are  made  by  multiple  brushes,  with  ends  bent 
so  that  they  are  not  tangent  to  the  circle  in  which  they  move  and  therefore  do  not  wear  rings 
in  the  blocks.  The  contact  blocks  are  on  the  under  side  of  the  plate  on  which  they  are 
mounted,  thus  insuring  a  good  contact,  free  from  dirt.  The  galvanometer  is  of  the  suspended 
type  and  has  a  sensibility  of  1  megohm.  With  a  galvanometer  of  this  type,  all  trouble  experi- 
enced on  account  of  the  dulling  of  the  pivots  as  used  in  old  style  instruments  is  entirely  obvi- 
ated. The  resistances  are  the  same  as  used  in  our  Resistance  Boxes,  described  on  pages  220-2, 
and  are  accurate  to  1/10  per  cent.  The  entire  set  is  mounted  in  a  finely  finished  hardwood 

case,  with  leather  strap  handle  for  carrying.     Complete  with  directions 200.00 

F4851.  RESISTANCES  on  Spools.  These  resistances  are  of  the  same  quality  used  in  our  Resistance 
Boxes  and  are  guaranteed  to  be  of  the  best  workmanship.  The  winding  is  bifilar  on  substantial 
wooden  spools,  the  ends  soldered  to  heavy  copper  terminals.  Accurate  to  i/£  of  1%. 

Resistance  in  ohms 1  2        5        10        25        50      100      200     500     1000    5000 

Each 75        .75     .75     1.00     1.25     1.50     1.75     2.00     2.25     2.50     3.00 

F4853.  RESISTANCE  COILS,  mounted  in  brass  case,  rubber  top,  with  two  binding  posts  and  rubber  top 
brass  taper  plug  for  short  circuiting  the  coil.  Coils  wound  bifilar  on  wooden  spools,  and  guar- 
anteed to  an  accuracv  of  I/^Q  of  1%. 

Resistance  in  ohms! 1          2         5        10        25        50       100      200     500     1000     5000 

Each 6.00     6.00      .00     6.00     6.50     7.00     7.50     8.00     8.50     9.00     10.00 

F4861.  STANDARD  RESISTANCES,  N.  B.  S.,  as  designed  by  Dr.  E.  B.  Rosa  of  the  Bureau  of  Standards. 
(Bulletin  B.  of  Stds.,  Vol.  5,  p.  413.)  In  these  resistances  the  coil  is  wound  on  a  metal  cylinder 
and  baked  in  shellac.  It  is  supported  by  a  small  tube  (closed  at  the  bottom)  which  serves 
as  a  thermometer  tube.  The  leads  pass  through  a  hard  rubber  top  which  screws  into  the  brass 
case.  The  coil  is  adjusted  to  the  highest  precision  and  the  case  filled  with  moisture-free  oil 
and  hermetically  sealed. 

These  coils  have  the  following  advantages  over  the  old  Reichsanstalt  form: — -(1)  They  are  prac- 
tically constant.  Only  one  coil  out  of  28  changed  as  much  as  2  parts  in  100,000  in  12  months. 
(2)  They  are  more  compact,  the  distance  between  terminals  being  only  7.5  cm. 

Resistance,  ohms 1  10  100  1 .000          10.000 

Each 20.00  20.00  20.00  20.00  25.00 


224 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


No.  4960. 


No.  4964-8. 


No.  4990F.  Nos.  4990B-E.         No.  4990A. 

RHEOSTATS 

4960.  RHEOSTAT,  Carbon,  for  use  in  battery  testing,  calibrating  electrical  instruments,  photometry, 
and  any  experiments  in  which  a  UNIFORM  VARIATION  of  resistance  is  desired.  Com- 
sists  of  90  carbon  plates  1%  inches  square  and  %  inch  thick,  mounted  between  castings  on  a 
base  of  asbestos  wood  so  that  pressure  can  be  placed  on  them  by  a  screw,  thus  allowing  a 
range  of  resistance  of  from  about  0.1  ohm  to  8  ohms  or  more,  including  all  intermediate 
values.  Safe  load  for  constant  duty,  200  watts.  A  momentary  overload  of  from  500  to  1000 
watts  may  be  applied  without  danger,  of  injury  $15.00 

RHEOSTATS,  Ceuco  Laboratory.  These  new  rheostats  embody  all  the  excellent  features  of  the 
rheostats  of  the  Ruhstrat  type  which  we  formerly  listed  for  Duty  Free  importation.  Oxidized 
resistance  wire  is  wound  on  an  enameled  metal  tube  which  provides  for  the  more  rapid  dissipa- 
tion of  heat  than  the  old  slate  form.  The  difference  of  potential  between  the  adjacent  turns  is 
so  small  that  the  oxide  covering  of  the  wire  provides  sufficient  insulation.  The  Current  Eatings 
are  for  Continuous  Duty.  Each  rheostat  is  provided  with  a  slider  for  regulating  the  amount  of 
resistance  in  circuit,  and  with  three  binding  posts,  as  shown  in  the  illustration,  by  means  of 
which  it  may  be  used  as  either  fixed  or  variable  resistance  or  as  a  source  of  varying  potential  in 
a  shunt  circuit.  Specify  catalog  number  and  size  number  in  ordering. 
4964.  KHEOSTATS.  Size  of  Tube,  2x8  in. 

No 1  2  4  6  8 

Approx.  resistance,  ohms 1700  300  50  25  12 

Current  capacity,  amperes 0.5  1  2  3  4 

Each 7.50  7.50          7.50  7.50          7.50 


16 

3 

8 

7.50 


4966.    RHEOSTATS.     Size  of  Tube,  2x12  in. 

No 1  2  3  4  5 

Approx.  resistance,  ohms. .     3000        500        175          90  65 

Current  capacity,  amperes.      0.5  1  1.5  2  2.5 

Each 8.50        8.50       8.50        8.50        8.50 

4968.    RHEOSTATS.     Size  of  Tube,  2x20  in. 

No 3 

Approx.  resistance,  ohms 315 

Current  capacity,  amperes 1.5 

Each  .  10.00 


6 

40 

3 

8.50 

4 

160 

2 

10.00 


20 

4 

8.50 


12 

10 

6 

8.50 


6 

75 

3 

10.00 


16 

5 

8 

8.50 

8 

35 

4 

10.00 


4990.  RHEOSTATS,  National,  tapered  (i.  e.,  having  the  first  step  of  greater  current-carrying  capacity 
than  the  others).  These  are  inexpensive,  variable  rheostats  for  use  in  the  laboratory  where 
small  current  carrying  capacities,  comparatively  small  resistances  and  small  wattage  consump- 
tion are  needed.  (For  rheostats  of  large  resistance,  high  current  capacity  and  maximum  dis- 
sipation of  energy,  see  Nos.  4964-4980.)  A  rolling  contact  insures  long  life  to  the  resistance 
element. 

No A  B  C  D  E 

Maximum  amperes,  first  step 1  5 

Ampere  capacity,  with  entire  rheostat  in 

circuit 0.5  1  1.5  2.5 

Total  resistance,  ohms 80  40  26.6  20  16 

No.  of  steps 228  250  238  252  252 

Each  4.35  4.35  4.35  4.35  6.00 


F 
6 

3 

13.3 
140 
7.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


225 


Nos.  4972-8. 

RHEOSTATS,  Dodge  Design,  providing  a  system  of  wiring  whereby  a  Cenco  Rheostat  may  be  con- 
nected either  in  series  with  the  load  or  as  a  shunt  across  the  line,  the  change  being  made  simply 
by  closing  a  single-throw  switch.  By  means  of  the  slider,  the  resistance  may  be  varied  from 
zero  to  the  maximum  of  the  rheostat.  When  connected  in  series  with  the  load,  this  variation 
of  the  resistances  produces  a  variation  in  the  voltage  across  the  load,  the  minimum  of  which  is 
limited  by  the  ratio  of  the  load  resistance  to  the  total  resistance  of  the  circuit.  The  current 
through  the  load  is  varied  in  the  same  proportion.  By  this  connection  it  is  impossible  to  obtain 
very  small  currents  and  voltages.  By  closing  the  switch  and  thereby  shunting  the  rheostat 
across  the  line,  a  potentiometer  effect  is  secured  by  means  of  which  the  voltage  and  current 
may  be  varied  from  zero  to  a  maximum  amount,  which  is  the  same  as  the  minimum  of  the  series 
connection.  In  this  manner  one  secures  the  full  value  of  the  rheostat  and  in  a  simple  fashion 
can  run  the  entire  range  of  voltage  and  current. 

OTHER  ADVANTAGES  OFFERED  BY  THE  DODGE  RHEOSTAT. 
1 — Substantial  mounting  upon  base  of  asbestos  slate. 
2 — Clear  distinction  between  terminals  of  load  and  line. 

3 — Rating  of  rheostat  in  maximum  current  and  voltage  stamped  in  plain  figures  on  slider. 
4 — High  efficiency.  Greatest  possible  current  range  for  given  voltage  and  size  of  tube. 
5 — Easy  selection  of  proper  capacity.  Voltage  of  source  and  maximum  load  current  determine  the 

particular  rheostat  to  purchase. 

In  ordering  rheostats  of  the  Dodge  design  it  is  necessary  to  consider  only  the  available  voltage 
and  the  maximum  current  required  by  the  load.  Those  listed  first  under  each  catalog  number 
are  designed  to  give  the  very  highest  capacity  possible  within  the  limits  imposed  by  voltage, 
length  of  tube,  and  a  moderate  temperature  rise,  and  therefore  have  the  lowest  resistance. 
These  rheostats  should  be  ordered  unless  it  is  absolutely  certain  that  a  higher  resistance  is 
needed.  For  these  cases  the  other  sizes  are  provided,  wound  with  smaller  wire,  and  hence  of 
smaller  current  carrying  capacity.  Current  rating  is  for  continuous  service  with  moderate  tem- 
perature rise.  Overloads  of  50  per  cent,  and  more  are  permissible  on  intermittent  service. 
4972.  RHEOSTATS,  Dodge  Design,  Single.  For  a  maximum  voltage  of  40.  Length  of  tube,  12  inches. 

No 12  6  4 

Maximum  current,  amperes 6  3  2 

Approximate  resistance,  ohms 10  40  90 

Each $12.50  12.50  12.50 

4974.    RHEOSTATS,  Dodge  Design,  Single.     For  a  maximum  voltage  of  110.     Length  of  tube,  12  inches. 

No 5  4  3 

Maximum  current,  amperes 2.5  2.0  1.5 

Approximate  resistance,  ohms 65  90  175 

Each 12.50  12.50  12.50 

4976.    RHEOSTATS,  Dodge  Design,  Single.     For  maximum  voltage  of  110.     Length  of  tube,  20  inches. 

No 8  6 

Maximum  current,  amperes 4  3 

Approximate  resistance,  ohms 35  75 

Each 16.00  16.00 

4978.    RHEOSTATS,  Dodge  Design,  Single.     For  a  maximum  voltage  of  220.     Length  of  tube,  20  inches. 

No 4  3 

Maximum  current,  amperes 2  1.5 

Approximate  resistance,  ohms 160  315 

Each 16.00  16.00 

4980.   RHEOSTATS,  Dodge  Design,  Double.     Two  tubes  in  parallel  on  one  base. 

No A  B  C  D 

Maximum  voltage 40  110  110  220 

Maximum  current,  amperes ." 12  5  8  4 

Approximate  resistance,  ohms 32  17  80 

Length  of  tube,  inches 12  12  20  20 

Each 22.00  22.00  27.50  27.50 


226 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


No.  F3865A.  No.  F3867. 

4994.  RHEOSTATS,  Plate  Type,  tapered  (i.  e.,  having  the  first  step  of  greater  current-carrying  capa- 
city than  the  others).  Of  rugged  construction,  intended  for  permanent  mounting  upon  wall 
or  switchboard,  for  use  in  field  regulation  of  motors  or  dynamos.  They  will  find  many  other 
uses  in  the  laboratory  where  a  permanent  rugged  rheostat  is  needed,  such  as  the  control  of  cur- 
rent for  electric  combustion  and  muffle  furnaces,  control  of  direct  current  for  electrolytic 


A  B 

1  2 

0.5  1 

150  75 

26  26 

1  1 

8  8 

Each  ................................      $6.50  6.50 


work,  etc.      No 

Maximum  amperes,  first  step  .......... 

Ampere  capacity,  with  entire  rheostat  in 
circuit  ............................. 

Total  resistance,  ohms  ................. 

No.  of  steps  .......................... 

No.  of  plates  in  parallel  ............... 

Diameter  of  plates,  inches 


5002.    ROTARY  CONVERTERS,  for  changing  direct  to  alternating  current. 


No. 


A 

110 

160 

70 

125 

47.00 


C      D 

4      8 

2      4 
37.5    18.75 
26     45 
1      1 
8      12 
6.50    9.50 
ent.  Complete 
B 
220 
160 
140 
125 
47.00 

E      F 
16      20 

8       10 
9.25     7.5 
120     120 
2       2 
15      15 
27.00    27.00 
with  starting  box 
C        D 
110       220 
250       250 
70       140 
185       18i) 
55.50     55.50 

and  regulating  rheostat. 

D.  C.  volts 

D.  C.  watts,  approx. 
A.  C.  volts,  approx. . 
A.  C.  watts,  approx. 

Each  

F3865.  TRANSFORMERS,  Laboratory.  For  use  on  110  Volt  A.  C.  Circuits  to  give  alternating  currents 
at  from  2  to  28  volts,  which  will  operate  all  classes  of  small  electric  apparatus  (A.  C.  or  D.  C.), 
including  induction  coils,  motors  and  small  lamps. 

These  transformers  are  indestructible,  being  enclosed  in  a  steel  shell,  and  operate  on  100  to  125 
volts,  60  cycles.  The  windings  are  embedded  in  an  insulating  compound  making  them  imper- 
vious to  moisture  and  cementing  the  entire  winding  into  one  solid  block. 

They  are  equipped  with  a  new  voltage  regulator,  which  eliminates  the  necessity  of  a  rheostat 
for  controlling  the  secondary  voltages  and  permits  of  the  voltage  being  varied  in  steps  of  two 
volts.  Voltages  4,  6,  8,  10,  14  and  18  are  obtained  by  connecting  to  binding  posts  on  the 
transformer  without  the  use  of  the  voltage  regulator  and  any  of  these  six  different  voltages 
can  be  used  simultaneously. 

Each  transformer  is  furnished  with  plug  and  flexible  attachment  cord  for  connecting  trans- 
former to  line  circuit,  as  well  as  secondary  terminals  on  the  secondary  side,  and  bears  a  name 
plate  giving  complete  enumeration  of  the  various  voltages  obtainable  from  it. 

No .". .  A  B  C 

Capacity,  watts 75  100  150 

Dimensions,  inches  4Vix3%x3i4  5x4x3%  5%x5x4 

Weight,  Ibe 5  8  11 

Each 4.00  5.50  7.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  5102. 


No.  F3879B. 


No.  5100. 


No.  5106. 


No.  5110. 


Insert  Member 
cf  No.  5110. 


No.  5111. 


No.  F3879D. 


F3867.  TRANSFORMER,  Laboratory.  To  meet  the  demand  for  a  transformer  of  smaller  capacity  than 
those  listed  under  No.  F3865,  there  has  been  developed  a  transformer  of  the  same  general  de- 
scription but  smaller  and  having  a  voltage  regulator  giving  eleven  different  voltages  in  steps 
of  2^  volts,  starting  at  2%  and  going  up  to  27^  volts.  It  is  3%x3x3  inches,  weighs  3  pounds 

and  is  designed  for  an  output  of  50  watts $3.00 

F3871.  TRANSFORMERS,  Step-up.  These  Transformers  represent  the  highest  type  of  construction,  and 
are  perfect  in  every  detail.  Constructed  with  a  magnetic  shunt  control  to  protect  them  from 
all  undue  current  surges.  Designed  to  connect  to  any  alternating  current  circuit.  No  imped- 
ance coil  or  other  resistance  necessary.  Can  be  used  for  Wireless  Work,  Generation  of  Ozone, 
Testing  Insulation,  Electrostatic  Separation,  High  Frequency  Experiments,  etc. 
For  operation  on  voltages  ranging  between  100  and  125  A.  C.,  60  cycles.  Current  regulates  as 

per  table  below.     No A  B  "  C  D 

Kilowatts    %  %  1  2% 

Secondary  voltage 10,000  10,000  20,000  20,000 

Primary  amperes 1  to  6  2  to  9  2%  to  14  6  to  22 

Heightj  inches 9  10  14  18 

Width,  inches 4%  5  6  8 

Length,  inches 9  10  12  14 

Weight,  Ibs 28  31  46  60 

Each   20.00  25.00  30.00  55.00 

F3873.  TRANSFORMER,  Step-up,  similar  to  No.  F3871  but  without  the  magnetic  shunt;  especially 
adapted  to  wireless  work.  Capacity,  ^4  k.w.;  secondary  voltage,  8000;  size,  9x4V>x6  inches; 

weight,  13  Ibs " 12.00 

F3875.  RESISTANCES,  Non-inductive,  for  use  with  Nos.  F3871-3  connected  in  shunt  across  the  primary 

terminals  for  prevention  of  inductive  kick-backs  in  the  primary  circuit Per  pair       1.00 

F3879.  TRANSFORMERS,  Bell  Ringing.  Designed  for  ringing  bells  and  buzzers  and  operating  annun- 
ciators, burglar-alarm  systems  and  gas  lighting  systems.  They  are  intended  for  connection 
directly  to  the  110-volt,  60-cycle  A.  C.  mains,  are  absolutely  fireproof  and  may  be  short  circuited 
indefinitely  without  burning  them  out  or  impairing  their  efficiency.  Dimensions,  15x10.5x11  cm. 

No ". A  B  C  D 

Secondary  voltage 6  6-14-20  6-12-18-24  10-25-35 

Capacity,  watts 60  60  100  100 

Weight,'  Ibs 7^  ?V>  9  9 

Each  6.00  7.00  9.00  10.00 

ELECTRICAL  ACCESSORIES 

5100.  ATTACHING  PLUG,  f useless,  Edison,  black  moulded  material  with  separable  cover  (No.  51161. 
35 

5102.  ATTACHING  PLUG  for  multiple  work,  porcelain.     One  end  fits  any  Edison  receptacle  or  socket, 

and  the  other  is  provided  with  Edison  socket  for  incandescent  lamp.  At  the  side  is  a  separable 
plug  (No.  5116)  for  attaching  a  lamp  cord  which  will  be  in  multiple  with  the  lamp  in  the 
socket .75 

5103.  ATTACHING  PLUG   for   series  work.     Same  as  No.  5102  except  that  the  lamp  cori  will  be  con- 

nected in  series  with  the  lamp  in  the  socket .75 


228 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  5128 
Shell. 


No.  F3541. 


No.  F3542. 


No.  5126. 


No.  5130. 


No.  F3543. 


No.  F3552. 


No.  F3561. 


5106.  CUT-OUT,  Standard  Plug  Fuse.  Double  pole,  Edison  sockets,  slotted  porcelain  base,  for  125  volts, 
30  amperes.  Without  fuse  plugs -33 

5110.  FUSE  PLUG,  Edison,  renewable,  will  hold  any  No.  5111  Fuse  Link.  Fuses  easily  replaced  in  insert 

member.     No A  B  C  D  E 

Carrying  capacity,  amperes 3  6  10  15  30 

Each 50  .50  .50  .50  .50 

5111.  RENEWAL  LINKS  for  No.  5110 Per  100         2.00  2.00  2.00  2.00  2.00 

For  FUSE  WIRE  see  No.  14438. 

F3405.  POLARITY  INDICATOR.     Indicates  instantly  the  negative  and  positive  poles  when  connected 
in  circuit.     Size,  2.5x9  cm.     Nickel-plated  shell  which  covers  and  protects  the  glass  tube  from 

injury.     For  voltages  up  to  50 $2.40 

F3406.  POLARITY  INDICATOR.     Same  as  No.  F3405,  but  for  voltages  from  50  to  600 2.40 

F3409.  POLE-INDICATING  PAPER.     When  two  electrical  leads,  or  terminals,  are  placed  close  together 
upon  a  piece  of  the  moistened  paper,  the  negative  pole  shows  a  red  stain.     In  books  of  25  strips, 

7x1  cm Per  book        .10 

For  PUSH  BUTTONS  see  Nos.  1198-1200. 

5114.    RECEPTACLE,  to  take  No.  5116  Plug,  for  open  wiring;  porcelain 30 

5116.    PLUG,  for  No.  5114  Receptacle,  with  two  finger  contacts;  black  moulded  material.     Used  also  on 

Nos.  5100,  5102  and  5103 20 

5118.    RECEPTACLE,  Key,  for  open  wiring,  Edison;  porcelain  base,  brass  shell 70 

5120.    RECEPTACLE,  Keyless,  for  open  wiring,  Edison;  porcelain 25 

5122.    RECEPTACLE,  Mounted.     No.  5120  Beceptacb  mounted  on  a  wood  base  10x10  cm,  with  binding 

posts.     Suitable  for  use  with  any  Edison  base  incandescent  lamp 1.25 

5124.    RECEPTACLE,  Miniature,  porcelain,  for  No.  8196  Lamps 09 

5126.    ROSETTE,  fuseless,  for  open  wiring,  for  250  volts  or  less;  porcelain . . '. 30 

5128.  SOCKET,  key,  Edison,  brass,  for  use  on  lamp  cord;  may  also  be  used  on  %  inch  I.  P.  size  male 
thread.  Of  new  design,  having  the  two  parts  of  the  shell  held  together  by  a  threaded  brass  ring, 
which  is  readily  removed  when  the  socket  is  to  be  rewired.  (Illustration  shows  construction 

clearly)    .50 

5130.    SOCKET,  keyless,  Edison,  porcelain,  with  two  finger  contacts,  for  use  with  Nos.  5100,  5102,  5103 

and  5114  in  place  of  the  separable  cover .30 

SPARK  COILS,  see  Induction  Coils. 

F3541.  SWITCH,  Knife,  porcelain  base,  single  pole,  single  throw,  25  amperes.  Base  about  3x8  cm.  .35 
F3542.  SWITCH,  Knife,  porcelain  base,  single  pole,  double  throw,  25  amperes.  Base  about  3.5x10  cm.  .50 
F3543.  SWITCH,  Knife,  porcelain  base,  double  pole,  single  throw,  25  amperes.  Base  about  5x6.5  cm .  .55 
F3544.  SWITCH,  Knife,  porcelain  base,  double  pole,  double  throw,  25  amperes.  Base  about  6.5x10  cm.  .80 
F3551.  SWITCH,  Rubber  Base,  1  point,  with  binding  post.  Base  about  5x7.5  cm 1.20 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


229 


No.  5134. 


J> 


No.  5156. 


No.  5148. 


No.  5140C. 


F3552, 
F3553, 
F3561, 
F3562, 
F3.363 
5132. 

.3134. 
5136. 


5140. 


5148. 


5150. 
5156. 


SWITCH,  Rubber  Base,  2  point,  with  binding  posts.    Base  about  5x7.5  em $1.30 

SWITCH,  Kubber  Base,  4  point,  with  binding  posts.     Base  about  7.5x7.5  cm 1-85 

SWITCH,  Wood  Base,  1  point,  about  6.5  cm  in  diameter 15 

SWITCH,  Wood  Base,  2  point,  about  6.5  cm  in  diameter 17 

SWITCH,  Wood  Base,  4  point,  about  6.5  cm  in  diameter 26 

SWITCH,  Push  Through,  for  use  on  lamp  cord,  for  125  volts,  6  amperes  or  250  volts,  3  amperes: 

black  moulded  material 60 

SWITCH,  Snap,  double  pole,  slotted  porcelain  base,  for  250  volts  or  less,  10  ampere  current.  Indi- 
cates whether  current  is  on  or  off 1-00 

TAPE,  Insulating,  cloth  base,  %  inch  wide,  black,  best   quality;   will  not   dry  out.     In   quarter 

pound  rolls   Per  roll         .25 

TELEPHONE  APPARATUS,  see  Catalog  F  of  Physical  Apparatus. 
For  other  ELECTRICAL  APPARATUS,  see  Physical  Chemistry  Apparatus. 

ELECTROLYTIC  OUTFIT,  Braun,  for  the  quantitative  separation  of  metals.  Extensively  used 
for  determining  copper  by  the  rotating  anode.  A  complete  determination  can  be  made  by 
this  method  in  less  than  half  an  hour.  The  apparatus  is  equipped  with  a  motor  mounted  at 
one  side  to  which  a  line  shaft  is  attached,  from  which  each  unit  is  driven  by  a  special  fric- 
tion device  enabling  the  operator  to  use  one  or  more  units  at  one  time.  The  speed  is  regu- 
lated by  a  rheostat.  A  separate  rheostat  controls  the  current  supplied  to  the  individual 
units,  each  unit  having  an  individual  switch.  Revolving  anodes  and  gauze  cathodes  should 
be  used.  The  ammeter,  line  shaft,  bearings,  switches,  etc.,  are  all  enclosed  in  glass  to  pre- 
vent coming  in  contact  with  acid  fumes.  The  lower  portion  of  the  cabinet  is  covered  with 
aluminum  and  the  binding  posts  are  also  made  of  this  material. 

Direct  Current  is  necessary  and  where  Alternating  Current  only  is  obtainable  a  Motor-Gen- 
erator Set  should  be  obtained.  (See  Xos.  4824  to  4848.) 

Complete  with  ammeter,  rheostats  for  motor  and  units,  and  stands  for  breakers,  with  instruc- 
tions for  mounting  and  operating.  Without  platinum  electrodes. 

No A  B  C 

Number  of  units 2  4  6 

Each    125.00       175.00       225.00 

For  PLATINUM  ELECTRODES,  see  general  heading  Platinum  Ware. 

ELECTROLYTIC  SUPPORT,  with  glass  rod  mounted  on  japanned  iron   tripod  base,   ring   for 

dish  with  three  platinum  contact  points  and  clamp  for  anode.     Binding  posts   are   provided 

on  both  ring  and  clamp.     Height  of  rod,  11%  inches;  diameter  of  ring,  2%  inches....      4.50 

ELECTROLYTIC  SUPPORT,  same  as  Xo.  5148,  but  with  two  clamps  with  binding  posts      4.50 

ELECTRIC  ROTATOR  for  Anodes,   with  motor,    adjustable   bracket,    spindle    with    chuck    for 

holding  anode,  and  three  step  pulley.     Complete  with  rheostat  for  controlling  the  speed 

No A  B  C  D 

A.C.  D.C. 

For  volts   110  220  110  220 

Each    27.50         31.50         27.50         31.50 


230 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  5168.  No.  5170.  No.  5172.  No.  5174. 


No.  5180. 


No.  5183.         No.  5188.  No.  5191. 


EMERGENCY  KIT,  see  First  Aid  Cabinet. 
5160.     EMERY  CLOTH,  in  sheets  9x11  inches. 

No 000  00  0  1 

Per  sheet $0.10  .10  .10  .15 

Per  quire 2.00  2.00  2.00  2.25 

5162.     EMERY  PAPER,  in  sheets  9x11  inches. 

No 000  00                 0 

Per  sheet .' .06  .06  .06 

Per  quire 1.20  1.20  1.20 

5168.    EUDIOMETERS,  Bunsen's,  with  platinum  electrodes. 

Capacity,    cc 50 

Graduated  in,  cc i/,0 

Each   2.00 

5170.     EUDIOMETERS,  Bunsen's,  with  platinum  electrodes;  graduated  in  mm. 

Length  of  graduation,  mm 300 

Each   2.20 

EUDIOMETER,  Hoffman's,  see  Lecture  Apparatus. 
5172.     EUDIOMETERS,  Mitscherlich's,  with  glass  stop-cock  and  platinum  electrodes. 

Capacity,   cc 50 

Graduated  in,  cc 1/5 

Each   3.70 

5174.     EUDIOMETERS,  Ure'S,  U  form,  with  platinum  electrodes,  50  cc;  graduated  in  i£ths 


.15 
2.50 

1 

.06 
1.20 

100 
2.80 

500 
2.80 


100 
1/5 
4.20 

3.00 


EXTRACTION  APPARATUS 

5180.  EXTRACTION  APPARATUS,  Bailey-Walker,  consisting  of  a  metal  condenser,  small  glass  flask 

of  special  shape,  and  a  small  glass  siphon  cup.  This  is  one  of  the  most  compact  forms  of  extrac- 
tion apparatus  and  can  be  used  for  any  kind  of  work.  The  flask  is  light  and  can  be  accurately 
weighed  and  easily  cleaned.  Made  according  to  the  design  of  Bailey  and  Walker,  of  the  Bureau 
of  Chemistry,  United  States  Department  of  Agriculture.  (See  Journal  of  Industrial  &  Engin- 
eering Chemistry,  Vol.  VI,  No.  6,  for  June  1914,  page  497) 5.00 

5181.  CONDENSER  only  of  No.  5180 - 3.50 

5182.  FLASK  only  of  No.  5180 60 

5183.  SIPHON  CUP  only  of  No.  5180 65 

5184.  GOOCH  CRUCIBLE,  Porcelain,  25  cc,  with  holes  for  suspension;  for  use  with  No.  5180,  for  per- 

colation method   i 40 

5185.  GLASS  CONDENSER  for  No.  5180,  of  compact  form,  for  use  when  desirable  to  avoid  contact  of 

metal  with  the  solvent 1.00 

5188.  EXTRACTION  APPARATUS,  Knorr's,  original  form,  consisting  of  a  No.  5654  Flask,  100  cc,  for 

mercury  seal,  No.  5189  Condenser  and  No.  5191  Extraction  Tube 8.50 

5189.  CONDENSER  only  of  No.  5188  with  adapter  sealed  on 3.00 

5654.     EXTRACTION  FLASK  only  of  No.  5188,  Knorr's   original  form,  for  mercury   seal.     Capacity, 

100  cc ' 50 

5191.     EXTRACTION  TUBE  only  of  No.  5188,  Knorr's   original  form,  with   perforated   platinum   disk 
sealed  in  and  three  glass  projections  to  allow  escape  of  ether  vapor  from  the  flask 5.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


231 


No.  5197. 


No.  5204. 


No.  5206. 


No.  5212.     No.  5213.     No.  5214.  No.  5216. 


5194.  EXTRACTION  APPARATUS,  Knorr's,  modified  by  Walter  &  Goodrich.  Complete  with  Con- 
denser No.  5189,  extraction  tube,  perforated  nickel  lower  disk  and  flask  for  mercury  seal  with 
holes  for  ether  return,  but  without  spring  or  upper  perforated  disk.  (See  Circular  No.  69, 

Bureau  of  Chemistry,  United  States  DepartJient  of  Agriculture) $4.35 

Extra  Parts  for  No.  5194. 

5197.  EXTRACTION  TUBE,  improved  form,  without  projections  or  sealed  in  disk.    Without  wire  spring 

or  disk .45 

5198.  SPRING  for  No.  5197  to  press  sample  against  lower  disk .25 

5199.  DISK,  upper,  for  No.  5197,  of  nickel .30 

5200.  DISK,  upper,  for  No.  5197,  of  platinum at  market  price 

5201.  DISK,  lower,  for  No.  5197,  of  nickel 40 

5202.  DISK,  lower,  for  No.  5197,  of  platinum at  market  price 

5656.     EXTRACTION  FLASK,  improved  form,  same  as  No.  5654,  but  with  two  holes  in  neck  for  return 

flow  of  ether 50 

5204.  EXTRACTION  APPARATUS,  Eeed's,  of  polished  copper,  for  bark  and  wood  extracts.  Widely 
used  in  tanning  laboratories.  Complete  with  Soxhlet  spherical  condenser 33.00 

5206.  EXTRACTION  APPARATUS  for  Rubber  Insulating  Material,  as  recommended  by  the  Joint  Rub- 

ber Insulation  Committee.  Consists  of  a  glass  flask  of  special  size  with  condenser  of  the  Cottle 
or  Underwriters'  form  and  glass  siphon  cup,  made  according  to  the  exact  specifications  of  the 
Committee.  (See  Journal  of  Industrial  and  Engineering  Chemistry,  Volume  IX,  No.  3,  for 
March  1917,  page  310) 3.30 

5207.  CONDENSER  only  of  No.  5206 2.25 

5209.  FLASK  only  of  No.  5206,  of  Pyrex  Glass 35 

5210.  SIPHON  CUP  only  of  No.  5206 70 

5212.  EXTRACTION  APPARATUS,   Soxhlet's,   complete  with  No.   5646  Flask,   No.   5213   Extraction 

Tube  and  No.  5215  Allihn's  Condenser,  fitted  with  fine  grained  cork  stoppers  for  connection. 

No A  B  0 

Capacity  to  top  of  siphon,  cc 60          100          200 

Height  of  siphon  tube,  mm 100          110          120 

Approximate  inside  diameter,  mm. 30  38  50 

Suitable  for  extraction  thimbles,  mm 80x22     80x33   123x43 

Length  of  condenser  jacket,  inches 6  10 

Size  of  flask,  cc 125          175          250 

Each   3.25        3.60        4.50 

5213.  EXTRACTION  TUBES  only  of  No.  5212 1.50         2.00         2.80 

5214.  EXTRACTION  TUBES  only  for  No.  5212,  especially  designed  for  analysis  of  Cottonseed  Oil,  to 

take  Extraction  Thimbles  No.  5248,  80x22  mm. 

No A  B 

Length  of  siphon  tube,  mm 25  45 

Each 1-50 

5215.  CONDENSERS  only  of  No.  5212 Each       1.10         1.30         1.80 

CONDENSERS,  Soxhlet's,  for  use  with  No.  5212,  see  No.  3234. 

5646.     EXTRACTION  FLASKS  only  of  No.  5212. 

Capacity,  ce 60  125  175 

Approximate  diameter  of  neck,  mm 31  35  40 

To  take  rubber  stopper,  No.  .  7789 

Each 11  .13  .17  .21 

For  other  EXTRACTION  FLASKS,  see  Flasks,  Extraction. 

5216.  EXTRACTION  APPARATUS,  Soxhlet's,  similar  to  No.  5212,  but  with  all  joints  ground.     Com- 

plete with  three  flasks  ground  to  fit  extraction  tube. 

No ABC 

Capacitv  to  top  of  siphon,  ce 60  100  200 

Each  ..  8.50  9.60  10.50 


232 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  5218. 


No.  5222. 


No.  5226. 


No.  5232. 


No.  5238. 


No.  5244. 


5218.  EXTRACTION  APPARATUS,  Soxhlet's,  -with  Hopkins  Inner  Cooled  Condenser  ground  to  fit 
into  Soxhlet  extraction  tube,  with  Knorr  flask  for  mercury  seal,  preventing  any  leak  of  ether 
vapor. 

No A  B  C 

Capacity,  to  top  of  siphon,  ce 60  100  200 

Approximate  inside  diameter  of  extraction  tube,  mm 30  38  50 

Each $7.00  8.00  9.00 

6220.  EXTRACTION  APPARATUS,  same  as  No.  5218,  but  with  Sy's  flask  for  mercury  seal  in  place  of 
Knorr 's. 

No A  B 

Capacity,  to  top  of  siphon,  cc 60  100 

Each  . . '. 7.25  8.50 

5222.  EXTRACTION  APPARATUS,  Teas',  for  the  extraction  of  tanning  materials,  as  used  by  the  As- 

sociation of  Official  Agricultural  Chemists.  Consists  of  a  heavy  copper  flask  of  one  liter 
capacity,  fitted  with  ground  in  copper  extractor  lined  with  tin,  and  a  tin  lined  copper  Soxhlet 
condenser.  A  side  tube  is  provided  for  removal  of  percolate  and  for  flooding  the  contents  of 

the  extraction  tube.     Height,  18  inches;  diameter  of  flask,  7  inches 23.50 

CONDENSER  only  of  No.  5222,  see  No.  3234. 

5223.  EXTRACTION  TUBE  only  of  No.  5222.     Can  be  used  with  any  750  cc  Erlenmeyer  flask.  . .   16.50 

5226.  EXTRACTION  APPARATUS,  Underwriters'  Laboratories  Improved  Form,  with  glass  siphon  cup. 

(See  "Standards  for  Rubber  Covered  Wires  and  Cables,"  1915) '. . .     3.30 

5227.  CONDENSER  only  of  No.  5226 2.25 

5228.  EXTRACTION  FLASK  only  of  No.  5226 35 

5229.  SIPHON  CUP  only  of  No.  5226 70 

5232.  EXTRACTION  APPARATUS,  Wiley's,  consisting  of  nickel-plated  copper  condenser,  tin  lined, 

special  form,  with  suspended  porcelain  Gooch  crucible,  arranged  to  fit  into  straight  glass  tube 
with  ground  flange,  rendering  the  use  of  stoppers  unnecessary.  Both  residue  and  extracted 
matter  may  be  easily  weighed 6.50 

5233.  CONDENSER  only  of  No.  5232 5.35 

5235.     GLASS  TUBE  only  of  No.  5232,  of  Pyrex  glass 75 

5184.     GOOCH  CRUCIBLE  only  of  No.  5232,  with  holes  for  suspension 40 

5238.  EXTRACTION  APPARATUS,  Wiley's,  Modified  by  Richardson,  with  glass  siphon  cup.     Especi- 

ally adapted  for  extraction  of  tankage,  cotton-seed  meal,  meat,  soap,  etc.  (See  Journal  of 
Industrial  and  Engineering  Chemistry,  Vol.  IV,  No.  3,  for  March  1912,  page  221) 6.80 

5239.  GLASS  SIPHON  CUP  only  of  No.  5238 70 

5240.  GLASS  TUBE  only  of  No.  5238 .75 

CONDENSER  only  of  No.  5238,  see  No.  5233. 

5241.  PERFORATED  GLASS  CUP,  to  be  used  with  No.  5238,  in  place  of  siphon  cup  for  percolation 

purposes 60 

EXTRACTION  FLASKS,  see  Flasks,  Extraction. 

5244.  EXTRACTION  THIMBLES,  Alundum,  for  the  extraction  of  soaps,  fats,  food,  rubber,  etc.,  by 
both  organic  and  inorganic  solvents.  Very  rapid,  practically  indestructible  and  readily  cleaned 
by  ignition.  Medium  porosity  carried  in  stock.  Fine  and  coarse  porosities  can  be  supplied  on 
short  notice.  Thickness  of  wall,  approximately  1  mm. 

flat  bottom  round  bottom 

No A  B  C  D  E 

Length,    mm 55  70  90  100  127 

Diameter,    mm 35  25  19  34  45 

Each .50  .45  .50  .60  1.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


233 


No.  5246. 


No.  5254. 


No.  5248. 


No.  5260. 


5246.     EXTRACTION  THIMBLES,  Glass,  with  round  perforated  bottoms.     Easily  cleaned,  may  be  used 
repeatedly  and  exact  weight  determined. 


No 

Length,  mm . . . 
Diameter,  mm . 
Each  .. 


A 

80 
90 

$0.45 


B 
80 
33 
.65 


5248.  EXTRACTION  THIMBLES,  Whatman's  Seamless,  made  from  the  same  material  as  the  Whatman 
Filter  Papers  and  rendered  fat-free  by  a  special  chemical  process.  Can  be  used  repeatedly. 

Xo A  B  C 

Length,  mm 80  80  123 

Diameter,  mm 22  33  43 

Per  box  of  25 3.15  3.55  7.10 

5254.  EXTRACTION  TUBE,  Roehrig's,  for  use  in  determining  fat  in  milk  and  dairy  products  by  the 
Roese-Gottlieb  Official  Method  of  the  Association  of  Official  Agricultural  Chemists.  Gradu- 
ated to  80  cc  in  1  cc  divisions  with  side  tube  and  stop-cock  for  withdrawing  solvent.  Complete 
with  ground  glass  stopper,  on  wooden  base.  (See  Leach  "Food  Inspection  and  Analysis," 
page  200)  4.50 


EXTRACTION  APPARATUS  HEATERS 

5260.  EXTRACTION  APPARATUS  HEATER,  Cenco  Electric,  designed  by  W.  H.  Boss,  consisting  of 
a  box  of  asbestos  board  80x20x12  cm,  containing  a  series  of  resistance  coils  over  which  is  sup- 
ported a  sheet  iron  pan.  The  top  of  the  box  is  removable  and  has  openings  for  flasks  which 
rest  upon  the  bottom  of  the  iron  pan.  By  this  method  the  flasks  rest  upon  a  hot  plate  and  are 
surrounded  by  hot  air,  thus  requiring  a  minimum  current.  By  means  of  a  single  switch  arrange- 
ment, currents  from  1  to  4  amperes  at  110  volts,  in  9  steps,  may  be  obtained,  giving  a  wide 
range  of  temperature  for  solvents  at  various  boiling  points.  This  may  be  used  as  an  ordinary 
hot  plate  by  removing  the  top,  or  as  a  liquid  bath  by  using  water  in  the  iron  box.  The  supports 
are  adjustable  in  height  with  clamps  for  each  extractor  and  condenser.  Complete  with  covers 
for  holes 60.00 

5262.  EXTRACTION  APPARATUS  HEATERS,  Electric,  similar  in  general  construction  to  No.  5260, 
but  provided  with  six  electric  lamps  instead  of  the  system  of  heating  coils,  and  without  the 
iron  tray. 

Xo.  .'. A  B 

For  volts   110  220 

Each  . .  47.50  48.50 


234 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


ra 
g 


No.  5264. 


No.  5278. 
No.  5286. 


No.  5280. 
No.  5288. 


No.  5282. 


No.  5272. 


5264.  EXTRACTION  APPARATUS  HEATERS,  Electric,  similar  to  No.  5262,  but  with  individual  hot 
plates  for  the  different  flasks.  As  each  hot  plate  has  its  own  switch,  any  one  or  all  may  be 
used  at  one  time,  as  desired.  Length,  24  inches;  width,  5%  inches;  height  to  top  of  hot  plate, 
9  inches;  diameter  of  hot  plates,  3%  inches.  With  six  hot  plates. 

No A  B 

For  volts   110  220 

Each $72.50  72.50 

5270.  EXTRACTION  APPARATUS  HEATER,  consisting  of  rectangular  water  bath  of  tinned  copper 
with  6  openings  2%  inches  in  diameter,  and  with  constant  water  level,  on  substantial  support. 
Fitted  with  uprights  at  ends  and  adjustable  supporting  racks  for  extractors.  Length,  23  inches; 
width,  4%  inches;  depth,  4  inches;  height  (not  including  uprights),  11  inches;  height  over  all, 

31  inches.     Without  glassware  or  burner 25.00 

5272.  EXTRACTION  APPARATUS  HEATER,  consisting  of  a  circular  water  bath  with  six  2%  inch 
openings  fitted  with  concentric  rings,  and  with  constant  water  level,  on  tripod  support  stand.  A 
support  rod  with  two  adjustable  arms  is  provided,  equipped  with  spring  clamps  for  six  ex- 
tractors. Diameter  of  water  bath,  12  inches;  depth,  4%  inches;  height  of  top  of  water  bath 
from  table,  10%  inches;  total  length  of  support  rod,  31%  inches.  Complete  with  adjustable 

ring  burner  for  illuminating  gas 29.50 

HOT  PLATES,  Electric,  for  extraction  apparatus,  see  general  heading  Hot  Plates,  Electric. 
FAUCET  CONNECTIONS,  see  Hose  Connections. 
5278.     FERMENTATION  TUBES,  Smith's,  on  glass  foot. 

No A  B 

Length  of  closed  tube,  mm 115  140 

Diameter  of  closed  tube,  mm 12  15 

Each 30  .35 

5280.     FERMENTATION  TUBES,  Smith's,  without  glass  foot. 

No A  B 

Length  of  closed  tube,  mm 115  140 

Diameter  of  closed  tube,  mm 12  15 

Each 20  .25 

5282.     FERMENTATION  TUBES,  same  as  No.  5280,  but  without  bulb. 

No A  B 

Length  of  closed  tube,  mm 125  175 

Diameter  of  closed  tube,  mm 12  15 

Each...  15  .20 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


235 


No.  5284. 


No.  5292. 


n 


No.  5290. 


No.  5312. 


5284. 
5286. 


5288. 
5290. 

5292. 
5296. 
5298. 
5300. 
5302. 
5306. 

5312. 
5314. 


No.  5296. 


No.  5298. 


Nos.  5314-16.  No.  5300. 

CHART,  Frost's  Gasometer,  for  measuring  gas  in  fermentation  tubes $0.10 

FERMENTATION  TUBE,  Standard,  as  adopted  by  the  American  Public  Health  Association. 
Length  of  closed  tube,  140  mm;  diameter  of  tube,  15  mm;  diameter  of  bulb,  38  mm.  On  glass 
foot.  (See  "Standard  Methods  of  Water  Analysis,"  1915,  page  137) 50 

FERMENTATION  TUBE,  Standard,  same  as  No.  5286,  but  without  glass  foot 35 

FERMENTATION  TUBE  SUPPORT  for  single  tubes.  Of  wood  with  brass  clip  for  holding 
tubes  .^  _._._. 1.00 

FERMENTATION  TUBE  SUPPORT,  of  metal,  for  holding  10  fermentation  tubes.  Can  also  be 
used  for  test  tubes,  ureometers,  and  any  tubes  not  less  than  5  inches  long 1.60 

FIGURES,  Steel,  see  Dies  No.  3820. 

FILES,  Rat  Tail,  bastard  cut. 

Length  of  cut  portion,  inches 4  5  6  8 

Each 14  .16  .18  .20 

FILES,  Triangular,  slim  tapers,  single  cut,  for  use  in  the  laboratory  for  cutting  glass  tubing. 


Length  of  cut  portion,  inches. 

Each 

FILES,  Half  Round,  bastard  cut. 

Length  of  cut  portion,  inches 

Each  

FILES,  Half  Round,  cabinet  wood  rasps. 

Length  of  cut  portion,  inches 

Each 

FILE  HANDLES,  soft  wood  with  ferrule. 

Diameter,  inches 

Each 

Per  dozen  


3 
.08 


4 
.10 


5 
.12 


FILTERING  APPARATUS 


i 

.03 
.30 


6 
.U 

8 
.50 


.84 


.03 
.30 


8 
.22 

10 
.62 

10 
1.04 


.03 
.30 


FILTERING  APPARATUS,  consisting  of  Glass  Bell  Jar  No.  1162,  with  heavy  glass  plate  ground 
to  make  air  tight  seal,  two-hole  rubber  stopper,  2%  inch  funnel,  and  L  tube. 

No A  B 

Size  of  bell  jar,  inches 5x9  6%xl  1 

Size  of  glass  plate,  inches > 6x6  8x8 

Each 4.50  5.00 

FILTERING  APPARATUS,  Berkefeld  Type,  consisting  of  a  porous  cylinder  fitted  with  metal 
head  piece  and  outlet  tube,  and  provided  with  glass  mantle  for  holding  liquids.  Extensively 
used  for  sterilizing  liquids  of  all  kinds,  filtering  serums,  toxins,  etc.,  and  in  separating  bacteria 
from  cultures.  They  should  be  used  in  conection  with  Filter  Flasks,  No.  5664,  attached  to  a 
filter  pump  or  other  means  of  exhausting  air.  Without  flask  or  pump. 

No A  B  C  D  E  F 

Height  of  cylinder,  inches 1%  2%  5  8  8  10 

Diameter  of  cylinder,  inches %  %  1  •>&  '..          1%  2 

Each 1.65          2.00  3.50          4.25  4.40  5.25 


236 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


5315. 


5316. 


No.  5318. 


Nos.  5320-6. 


Nos.  5320-6. 
(Cross-section.) 


Nos.  5328-30. 


FILTERING  CYLINDERS  only  of  No.  5314. 

No  ...................................        A 

Each  .................................     $1.15 

GLASS  MANTLES  only  of  No.  5314. 
No  .................  . 

Size,  inches 
For  cylinder,  No 
Each 


B 
1.25 


A 
50 


C 
2.50 


D 
3.00 


E 
3.15 


BCD 

4x1       5%x2V2    11x2% 
B  C  D&E 

.75  1.00  1.25 


F 
3.50 


E 
14x4 

F 
1.75 


5318.  FILTERING  APPARATUS,  for  Serums,  for  pressure  filtration.     The  outfit  consists  of  a  cast 

iron  reservoir  enameled  inside,  to  which  is  attached  the  filter  chamber,  containing  the  por- 
ous tube  or  bougie.  A  stop-cock  is  provided  in  the  connecting  tube  between  the  reservoir  and 
filter  chamber.  Diameter  of  reservoir,  3%  inches;  depth  of  reservoir,  12  inches;  height  of 
apparatus  over  all,  46  inches;  floor  space  occupied,  18x18  inches.  Complete  with  pressure  gage, 
pump,  connecting  tubing  and  stand  as  shown  in  illustration 125.00 

5319.  FILTER  TUBE  only  of  No.  5318.    Length  over  all,  S1/^  inches;  width  at  base,  1%  inches;  width 

at  top  %  inch 1.95 

5320.  FILTERING  APPARATUS  for  Soils,  Brigg's  Design,   as  described   in  Bulletin   No.  31   of  the 

Bureau  of  Soils.  Extensively  used  in  the  filtration  of  soil  solutions.  Can  be  used  in  filter- 
ing any  solution  under  pressure  where  a  clear  filtrate  is  desired.  Consists  of  a  cylinder  of 
brass  nickel-plated  on  the  outside  and  heavily  plated  with  silver  inside,  fitted  with  a  Pasteur- 
Chamberland  filter  tube  of  unglazed  porcelain.  Capacity  of  reservoir,  approximately  800 
cc  16.00 

5322.  FILTERING  APPARATUS  for  Serums,  Brigg's  Design,  same  as  No.  5320,  but  with  special  bou- 
gie for  serum  filtration 16.00 

5324.  FILTERING  APPARATUS  for  Soils,  Brigg's  Design,  similar  to  No.  5320,  but  of  iron,  porcelain 
lined.  Capacity  of  reservoir,  approximately  750  cc.  Complete  with  Pasteur-Chamberland 
Filter  Tube  ..." 13.00 

5326.  FILTERING  APPARATUS  for  Serums,  Brigg's  Design,  same  as  No.  5324,  but  with  special  bou- 
gie for  serum  filtration 13.00 

5328.  FILTERING  APPARATUS  for  Soils,  Brigg's  Design,  similar  to  No.  5320,  but  complete  with  air 
pump  and  tank  mounted  on  a  substantial  base.  This  makes  a  very  convenient  outfit  for  field 
use  in  soil  investigations.  Capacity  of  reservoir,  about  250  cc.  Complete  as  illustrated  30.00 

5330.  FILTERING  APPARATUS  for  Serums,  Brigg's  Design,  same  as  No.  5328,  but  with  special 
bougie  for  serum  filtration 30.00 


•> 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


237 


No.  5352. 


No.  5354. 


No.  5356. 


5332.  FILTERING  APPARATUS  for  Soils,  Brigg's  Design,  consisting  of  four  No.  5320  Filters, 
mounted  as  shown,  complete  with  air  reservoir  of  10  gallons  capacity,  pressure  gage  and  spe- 
cial compression  pump ; . .  $100.00 

5334.  FILTERING  APPARATUS  for  Serums,  Brigg's  Design,  same  as  No.  5332,  but  with  special  bou- 
gies for  serum  filtration 100.00 

5336.  FILTERING  APPARATUS  for  Soils,  Brigg's  Design,  same  as  No.  5332,  but  with  four  porcelain 
lined  Filters  No.  5324 88.00 

5338.  FILTERING  APPARATUS  for  Serums,  Brigg's  Design,  same  as  No.  5336,  but  with  special  bou- 
gies for  serum  filtration " 88.00 

5340.  FILTER  TUBE,  for  Soils,  Pasteur-Chamberland,  French  make,  for  use  with  Nos.  5320,  5324, 
5328,  5332,  and  5336.  Length  over  all,  10  inches;  diameter  of  unglazed  cylinder,  1  inch  2.00 

5342.  FILTER  TUBE  (Bougie),  for  Serums,  Pasteur-Chamberland,  French  make,  for  use  with  Nos. 
5322,  5326,  5330,  5334  and  5338 2.00 

5346.  FILTERING  APPARATUS,  Fitzgerald's  Constant  Level,  consisting  of  a  300  cc  glass  reservoir, 
having  a  long  glass  rod  fitted  with  a  ground  stopper  for  closing  the  lower  opening  when  fill- 
ing the  apparatus.  The  liquid  to  be  filtered  is  introduced  through  the  opening  at  the  side  2.25 

5348.  FILTERING  APPARATUS,   Tray  Form,   consisting  of  glass  tray  with  ribbed  bottom  and  outlet 

at  one  corner.    The  entire  surface  of  the  filter  paper  is  utilized,  affording  four  times  as  much 

filtering  surface  from  the  same  sheet  as  in  a  funnel.    Takes  filter  paper  12x12  inches.  Widely 

used  for  separating  liquids  from  impurities  where  the  weight  of  the  separated  material  is  not 

needed.     Complete  with  supporting  tripod  as    shown 4.50 

5349.  FILTER  PAPER  for  No.  5348  Filtering  Apparatus,  in  sheets  12x12  inches. 

A.  For  rapid  filtration per  100  sheets     3.20 

B.  Heavy  paper  for  finer  work per  100  sheets     6.00 

5352.     FILTER  BAGS  of  felt. 

Capacity,  quarts 1  2  4 

Each 2.00  2.25  2.75 

5354.     FILTER  BALLOON,  Pukal,  of  unglazed  porcelain,  for  filtering  solutions  from  outside  by  means 

of  a  filter  pump.     Height,  200  mm;  diameter,  125  mm;  capacity,  about  400  ee 1.65 

FILTER  BOUGIES,  see  Filter  Tubes  Nos.  5340  and  5342. 

5356.  FILTER  CONES,  Alundum,  for  rapid  filtration  by  suction,  for  use  in  any  60°  funnel,  to  which 

they  are  attached  by  a  wide  band  of  rubber  tubing.  They  have  a  large  filtering  area  and  can 
be  completely  washed  free  from  all  soluble  salts,  as  the  entire  filtering  area  is  within  the  fun- 
nel. They  may  be  completely  cleansed  by  reverse  washing  and  ignition,  and  used  repeatedly. 
Complete  with  wire  stand  for  support  when  not  in  use.  Medium  porosity  only  carried  in  stock. 
Fine  and  coarse  porosities  can  be  supplied  on  short  notice. 

No A  B  C  D 

Capacity,  cc 20  50  60  100 

Diameter,  inches 1%  2%  3  4% 

Height,  inches 1%6  1%  2%6  3% 

Each 30  .35  .40  .50 

5357.  RUBBER  GASKETS  for  use  with  No.  5356.     No A  B  C  D 

For  filter  cone,  ee 20  50  60  100 

Each 05  .05  .08  .10 


238 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  5360. 


No.  5362. 


No.  5368. 


No.  5366. 


No.  5380. 


5360.     FILTER  CONE,  Best  American  Porcelain,  glazed  throughout  except  rim,  with  holes  about  1  mm 
in  diameter. 

No 3  4 

Diameter,  mm 50  63 

Length  of  side,  mm 43  58 

Each $0.90          1.10 

5362.    FILTER  CYLINDER,  Best  American  Porcelain,  unglazed,  with  flange,  for  filtering  solutions  by 
means  of  a  filter  flask.     Length,  115  mm;  diameter  inside,  16  mm;  diameter  outside,  20  mm; 

diameter  of  flange,  50  mm 80 

5366.    FILTER  DISKS,  Perforated,  Best  American  Porcelain,  with  beveled  edge. 

Diameter,    mm 25  38  50 

Each   20  .30  .38 

5368.  FILTER  DISHES,  Alundum,  to  fit  the  top  of  a  glass  funnel  for  rapidly  filtering  large  amounts 

of  material.  Especially  adapted  for  organic  work.  Filters  thoroughly,  quickly  and  without 
previous  preparation.  Medium  porosity  caried  in  stock.  Fine  and  coarse  porosities  can  be 
supplied  on  short  notice. 

No A  B  C 

Diameter,  inches 5%  4  2% 

Depth,  inches 2  2  1 

Capacity,  cc 400  300  50 

Each 1.50  1.00  .40 

5369.  RUBBER  GASKET,  molded  shape,  for  No.  5368A,  400  ec 50 

FILTER  FLASKS,  see  No.  5664. 

FILTER  PAPER 

5380.  FILTER  PAPER  for  qualitative  work.     A  pure   white    paper    of    superior    quality,    strong    and 

rapid.     Cut  in  round  filters,  100  in  a  package. 

Diameter,   cm 7.5        10       11     12.5        15        20        25        33        40        45        50 

Per  package  of  100  sheets.       .18      .21      .23      .27      .35      .55      .88     1.26     1.48     1.85    2.20 

5381.  FILTER  PAPER,  same  quality  as  No.  5380,  in  sheets  20x20  inches. 

Per  quire 80 

Per  ream 12.20 

5398.     FILTER  PAPER,  J.  Green  for  Agar  Agar,  similar  to  Chardin.    The  filters  are  folded  and  packed 
in  boxes. 

Diameter,  cm 34  50 

Number  in  box. ' 30  25 

Per  box 3.25  3.25 

5400.     FILTER  PAPER,  J.   Green  No.  588    (S.  &  S.   No.    588),   Folded,    excellent    quality,   free   from 
chlorine,  folded  in  such  a  way  as  to  protect  the  points  from  tearing.     In  boxes  of  100  filters. 

Diameter,  cm 12.5  15         18.5  24 

Per  box  of  100 1.00        1.20        1.50        2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


239 


WHATMAN  FILTER  PAPER 


WHATMAN  FILTER  PAPEES  have  been  developed  by  Messrs.  W.  &  E.  Balston,  Ltd.,  of  Eng- 
land, the  manufacturers  of  the  well  known  Whatman  Drawing  Paper.  Working  in  consulta- 
tion with  Cross  and  Bevan,  the  cellulose  experts,  they  have  succeeded  in  perfecting  a  complete 
line  of  these  papers,  which  have  been  acknowledged  to  be  equal  in  quality,  finish,  and  serv- 
ice to  any  previously  on  the  market.  These  papers  come  packed  in  well-made  carboard  boxes, 
carefully  labelled  and  sealed  to  prevent  handling,  each  box  containing  100  circles. 

The  grades  listed  below  offer  an  assortment  from  which  one  may  select  a  paper  suitable  to  any 
type  of  precise  analytical  work.  In  order  to  give  an  idea  of  the  work  for  which  each  grade 
is  best  suited,  we  give  the  number  of  the  Schleicher  &  Schuell,  Dreverhoff  or  Munktell  paper 
to  which  it  most  closely  corresponds. 


QUANTITY  PRICES. 

By  agreement  with  the  manufacturers  we  are  permitted  to  offer  the  following  discounts  upon 
Whatman  Filter  Papers  when  purchased  in  quantities: 

Upon  orders  amounting  to  less  than  $100.00  list     Net. 

Upon  orders  from  $100.00  to  $200.00  list 5% 

Upon  orders  above  $200.00 10% 

(Orders  may  be  assorted  as  to  kinds  and  sizes,  but  must  be  placed  at  one  time.) 

5410.  FILTER  PAPER,  Whatman  No.  1  (S.  &  S.  No.  595),  a  high  grade  rapid  filter  paper  for  general 

qualitative  work  and  for  filtering  ordinary  precipitates  when  the  ash  weight  of  the  paper  is 
of  no  consequence.  Widely  used  in  Sugar  Laboratories  and  for  the  filtration  of  yellow  Am- 
monium Phospho-Molybdate  after  digestion,  in  determining  phosphorus  in  fertilizers. 

Diameter,  cm 7  9          11       12.5          15       18.5          24 

Ash  weight  per  circle,  grams 00046     .00076     .0011     .0016     .0021     .0032     .0054 

Per  100  circles $0.20          .24        38        .37        .51        .71      1.25 

FILTER  PAPER,  Whatman  No.  1  (S.  &  S.  No.  595),  same  as  No.  5410,  but  in  sheets,  46.5  x  57  cm. 

5411.  Per  100  sheets 4.45 

5412.  Per  ream  (500  sheets) 20.25 

5414.  FILTER  PAPER.  Whatman  No.  2  (S.  &  S.  No.  597),  a  qualitative  paper  similar  to  No.  1,  but 
stouter,  retaining  fine  precipitates.  This  i?  the  standard  grade  for  analytical  purposes.  Widely 
used  in  the  qualitative  analysis  of  the  alkaline  earths,  and  in  general  where  fine  precipitates 
of  crystalline  nature  are  to  be  filtered.  Especially  applicable  to  Fertilizer,  Cement,  Steel,  and 
Ore  Analysis. 

Diameter,  cm 7  9          11       12.5          15       18.5          24 

Ash  weight  per  circle,  grams 0007       .0012     .0018     .0024     .0034     .0052     .0089 

Per  100  circles .27          .34        .42        .52        .74      1.04      1.78 


240  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 

5416.  FILTER  PAPER,  Whatman  No.  3  (S.  &  S.  No.  598),  a  very  stout  filter  paper  for  general  qualita- 

tive work.  Slightly  slower  than  No.  2,  but  very  retentive.  Will  withstand  considerable  wash- 
ing. Especially  suited  for  fine  precipitates,  such  as  Metastannie  Acid,  Calcium  Oxalate,  and 
Ammonium  Phospho-Molybdate.  Very  satisfactory  for  filtering  the  solution  of  a  fusion  made 
with  Eschka's  mixture  in  determining  Sulphur  in  coal  and  coke;  can  also  be  used  in  recovering 
small  quantities  of  Silver  in  the  form  of  chloride. 

Diameter,   cm 7  9          11       12.5          15       18.5 

Per  100  circles $0.40        .50        .57        .74      1.04      1.48 

FILTER  PAPER,  Whatman  No.  3,  same  as  No.  5416,  but  in  sheets  46.5  x  57  cm. 

5417.  Per  100  sheets 10.20 

5418.  Per  ream  (500  sheets) 46.40 

5420.  FILTER  PAPER,  Whatman  No.  4  (S.  &  S.  No.  604),  a  soft  paper  of  more  open  texture  than  the 

preceding.  Extremely  rapid,  but  not  recommended  for  use  with  tlje  finest  precipitates.  Es- 
pecially adapted  for  the  rapid  filtration  of  gelatinous  and  large  particle  precipitates  such  as 
Ferric  Hydroxide  and  Aluminum  Hydroxide;  also  useful  for  Pharmaceutical  purposes,  such  as 
the  filtration  of  fruit  juices,  syrups,  oils,  etc.  Widely  used  in  Copper  and  other  Ore  Mining, 
Sugar  and  Cement  Laboratories. 

Diameter,  cm 7  9          11       12.5          15       18.5          24 

Per  100  circles 30        .40        .50        .65        .90      1.30      2.22 

FILTER  PAPER,  Whatman  No.  4  (S.  &  S.  No.  604),  same  as  No.  5420,  but  in  sheets  46.5  x  57  cm. 

5421.  Per  100  sheets 8.75 

5422.  Per  ream  (500  sheets) 39.90 

5424.  FILTER  PAPER,  Whatman  No.  5  (S.  &  S.  No.  602),  a  very  tough,  hard  paper  of  close  texture, 
that  will  retain  the  finest  precipitates,  such  as  Barium  and  Lead  Sulphates  even  when  freshly 
precipitated.  Especially  suited  for  use  with  solutions  which  are  filtered  with  difficulty,  and 
for  vacuum  filtration  with  the  Buechner  funnel,  etc. 

Diameter,   cm 7  9          11       12.5          15 

Per  100  circles 27        .34        .41        .54        .75 

5430.  FILTER  PAPER,  Whatman  No.  30  (Dreverhoff  No.  207;  Munktell  No.  O),  a  single-acid  washed 
paper  of  low  ash  content,  rapid  and  retentive.  Very  satisfactory  for  the  filtration  of  Ammonium 
Phospho-Molybdate,  Barium  Sulphate  when  properly  precipitated,  for  volumetric  Lime  deter- 
minations and  for  general  quantitative  work  when  the  lowest  ash  is  not  important.  Extensively 
used  in  Cement  and  Metallurgical  Laboratories. 

Diameter,  cm " 7  9          11       12.5  15         18.5 

Ash  weight  per  circle,  grams .00012     .0002     .0003     .0004     .00057     .00087 

Per  100  circles .68        .90       1.20       1.50        1.90        2.70 

5432.  FILTER  PAPER,  Whatman  No.  31  (Munktell  No.  OB),  a  single-acid-washed  paper,  similar  to 
No.  30,  but  more  open  in  texture,  making  it  more  rapid.  On  account  of  its  extreme  rapidity  it 
is  not  recommended  for  the  finest  precipitates.  Suitable  for  the  very  rapid  filtration  of  gela- 
tinous and  large  particle  precipitates,  for  volumetric  determinations  of  Phosphates,  for  Silicon 
in  Iron  Analysis,  and  general  rapid  quantitative  separations  where  the  lowest  ash  weight  is 
not  essential.  Extensively  used  in  Metallurgical  Laboratories. 

Diameter,   cm 7  9          11       12.5  15         18.5 

Ash  weight  per  circle,  grams 00012     .0002     .0003     .0004     .00057     .00087 

Per  100  circles .68        .90       1.20       1.50        1.90        2.70 

5438.  FILTER  PAPER,  Whatman  No.  40  (S.  &  S.  No.  589=.  White  Ribbon),  a  double-aeid-washed  paper 
of  very  low  ash,  all  mineral  matter  having  been  removed  by  treatment  with  hydrochloric  and 
hydrofluoric  acids.  Filters  rapidly  and  retains  fine  precipitates.  This  is  the  standard  double- 
washed  grade  for  analytical  purposes.  Excellently  suited  for  Barium  Sulphate  when  properly 
precipitated  and  filtered  hot,  also  for  Lead  Sulphate,  and  for  crystalline  precipitates,  such  as 
Magnesium-Ammonium  Sulphate,  etc. 

Diameter,   cm 5.5  7  9  11         12.5  15 

Ash  weight  per  circle,  grams 00003     .00005     .000082     .00012     .00016     .00023 

Per  100  circles 1.10        1.20          1.70        2.00        2.30        2.70 

For  Quantity  Discounts,  see  Page  239. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A.  241 


No.  5460.  No.  5462. 

5440.  PILTER  PAPER,  Whatman  No.  41  (S.  &  S.  No.  589',  Black  Ribbon),  a  double-acid-washed  paper 
similar  to  No.  40,  but  more  open  in  texture  and  therefore  filters  more  rapidly.  Suitable  for 
Iron,  Aluminum,  and  other  gelatinous  precipitates  which  can  be  filtered  quickly  and  washed 
rapidly  and  easily.  Widely  used  in  determining  Silicon  in  Iron  and  Steel  Analysis. 

Diameter,   cm 7  9  11         12.5  15 

Ash  weight  per  circle,  grams 00005     .000082     .00012     .00016     .00023 

Per  100  circles $1.20          1.70        2.00        2.30        2.70 

5442.  FILTER  PAPER,  Whatman  No.  42  (S.  &  S.  No.  5893,  Blue  Ribbon),  a  double-acid-washed  paper, 
similar  to  No.  40,  but  much  harder  and  extremely  close  in  texture.  On  account  of  its  close 
texture  it  is  recommended  for  use  with  the  filter  pump  and  as  folded  filters  where  possible. 
Especially  adapted  for  the  finest  precipitates  which  tend  to  pass  through  the  filter  paper,  such 
as  Barium  Sulphate  when  precipitated  in  cold  solution,  and  in  general  for  precise  analytical 
work  where  speed  is  not  important. 

Diameter,  cm 5.5  7  9         11         12.5  15 

Per  100  circles 1.10      1.20      1.70      2.00        2.30        2.70 

5444.  FILTER  PAPER,  Whatman  No.  43  (S.  &  S.  No.  589',  Yellow  Ribbon)  a  double-aeid-washed  paper, 
of  the  same  stock  as  No.  40,  but  having  been  subjected  to  an  additional  chemical  process  which 
renders  it  fat-free.  Especially  suited  for  the  recovery  of  the  ether  extract  in  the  Roese-Gottlieb 
Fat  Test,  and  in  general  for  any  purposes  requiring  a  fat-free  paper. 

Diameter,   cm 9  11         12.5 

Per  100  circles 2.20        2.55        2.80 

5446.  FILTER  PAPER,  Whatman  No.  44  (S.  &  S.  No.  590),  a  double-acid-washed  paper  of  thinner  sub- 
stance and  lower  ash  content  than  the  preceding  numbers.  It  will  retain  the  finest  precipi- 
tates, but  is  slightly  slower  in  filtration  than  No.  40.  No.  44  is  recommended  for  use  when  the 
greatest  possible  degree  of  accuracy  in  quantitative  work  is  required. 

Diameter,  em 7  9  11       12.5  15 

Ash  weight  per  circle,  grams 00003     .00005     .000077     .0001     .00014 

Per  100  circles 1.50         2.20  2.55       2.80         3.60 

5452.  FILTER  PAPER,  Whatman  No.  50  (S.  &  S.  No.  575),  a  paper  specially  hardened  by  treatment 
with  Nitric  Acid.  Very  tough,  will  resist  great  pressure,  and  retain  the  very  finest  precipitates. 
Can  be  used  repeatedly,  the  hard  smooth  surface  permitting  precipitates  to  be  scraped  or 
washed  off  without  injury  to  the  paper.  Especially  recommended  for  use  with  vacuum.  Suit- 
able for  very  fine  precipitates  and  for  filtering  corrosive  liquids  such  as  Acids  and  strong 
Alkalies.  Should  be  used  when  it  is  desired  to  transfer  a  precipitate  without  ignition.  Wide- 
ly used  for  filtering  Biological  products,  as  the  hardened  surface  prevents  contamination  of 
the  filtered  product  by  particles  of  paper  when  scraped  off.  Can  be  used  as  a  substitute  for 
platinum  cones,  and  as  supports  for  large  folded  filters  to  prevent  them  bursting  at  the  points. 

Diameter,  cm 5.5         7         9       11     12.5       15     18.5       24       27 

Per  100  circles 90     1.20     1.70     2.00     2.30     2.70     3.60     6.10     7.30 

For  Quantity  Discounts,  see  Page  239. 

5460.  FILTER  PAPER  BOXES,  of  cardboard,  square,  telescoping  form,  to  hold  100  filters.  Very  con- 
venient for  keeping  filters  clean  and  free  from  dust. 

No A  B  C  D 

For  filters,   cm 9  11  12.5  ]5 

Per    dozen 30  .45  .55  .60 

5462.  FILTER  PAPER  CASE,  of  japanned  tin,  convenient  for  holding  filters  of  different  sizes.  Will 
take  6  sizes  from  7.5  cm  to  18.5  cm  in  diameter  


242 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Plate  ard  Frame  of  No.  5468. 


No.  5476. 


No.  5478. 


No.  5486. 


No.  5480.  No.  5482. 


5468. 

5470. 
5476. 

5478. 

5480 
548" 


5484. 
5485. 
5486 

5487. 
5492. 
5491. 


No.  5492. 


No.  5494. 


FILTER  PLATES,  sec  Filter  Disks. 

FILTER  PRESS,  Experimental  Form,  for  making   practical   tests   on    a   small   scale.      It   is   of 
rugged  construction,  with  parts  of  iron,  built  to  stand  a  pressure  of  150  pounds  to  the  square 
inch5.     Both  corrugated  plates  and  extension  frames  are  provided,  enabling  either  filter  paper 
or  cloth  to  be  used.     Complete  with  reservoir,  hand  pump  of  iron  with  brass  valves,  pressure 
gage,  siphon,  brass  discharge  cocks,  two  filter    plates,    three   frames,    filter   paper    and    cloth. 
Weight,  about  125  pounds  .........................................................    $75.00 

FILTER  PRESS,  Experimental  Form,  same  as  No.  5468,  but  with  all  parts  which  come  in  contact 
with  the  material  made  of  brass  ....................................................    100.00 

FILTER  PUMP,  Aspirator,  new  design,  of  brass.     Very  efficient. 

No  ...............................................................        A 

Length,   inches  ....................................................      3% 

Size  I.  P.  thread,  inches  ...........................................        % 

Each   ............................................................     1-50 

FILTER  PUMP,  Richards',  of  brass. 

No  ..........................  ..  ....................................        A 

Length,  inches  ....................................................          7 

Size  of  I.  P.  thread,  inches  ........................................        % 

Each   ____  .-  .......................................................     1-70 

FILTER  PUMP  COUPLING,  of  brass,  to  connect  Nos.  5476  and  5478  to  a  threaded  faucet. 
No  ........................................................       A  B  C 

For  filter  pump,  I.  P.  thread,  inches  .........................       %  Vi 

Each    ......................................................  35  .35 

FILTER  PUMP  COUPLING,  of  brass,  to  connect  Nos.  5476  and  5478  with  smooth 
No  .......................................................         A  B 

For  filter  pump,  I.  P.  thread,  inches  ........................         %  */4 

Eacn  ____  .  ....  ............................................  65     .65 


B 

4% 

Vt 

1.70 


2.80 


C 

5% 

% 

2.00 

C 
13 

% 
8.50 


D 
%  % 

.35         1.00 

faucet. 
C  D 

%  % 

.65         2.50 


FILTER  PUMP,  of  brass,  on  base  with  vacuum  gage,  inlet  and  outlet  tubes  ..............  10.00 

'FILTER  PUMP,  same  as  No.  5484,  but  without  vacuum  gage   ...........................  6.00 

FILTER  PUMP,  same  as  No.  5484,  with  vacuum  gage  and  stop-cocks  on  inlet  and  outlet  tubes 

...................................................................................  12.00 

FILTER  PUMP,  same  as  No.  5486,  but  without  vacuum  gage  ............................  7-50 

FILTER  PUMP,  Geissler's,  of  glass  ..................................................  l-°° 

FILTER  PUMP,  Muencke's,  of  glass  ...................................................  2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


243 


[PRESSURE 

WATER. 


VACUUM. 


{DISCHARGE. 

No.  5502. 


No.  5504. 


EMERGENCY 
INSTRUCTIONS 


No.  5510. 


No.  5520. 


5502.  FILTER  PUMP,  Water-Jet,  very  efficient  fo  use  in  filtration,  percolation,  evaporation,  distilla- 
tion, and  condensation.  May  be  permanen  ly  attached  or  may  be  used  with  rubber  tube  con- 
nections. Requires  only  10  pounds  water  pressure.  With  20  pounds  pressure,  the  capacity  is 
one-third  cubic  foot  of  air  per  minute.  A  one  gallon  vessel  may  be  exhausted  to  a  vacuum  of 
29%  inches  of  mercury  in  five  minutes  with  20  pounds  pressure.  Complete  with  vacuum  gage, 

connection  tee  and  two  stop-cocks $20.00 

5504.     FILTER  PtJMP,  Steam-Jet,  similar  to  Xo.  5502,  but  for  use  with  steam  instead  of  water.     A  one 

gallon  vessel  may  be  exhausted  to  a  vacuum  of  24  inches  of  mercury  in  seven  seconds  with  50 

pounds  pressure.     Complete  with  vacuum  gage,  connecting  tee,  stop  and  check  valves. . .     20.00 

5510.     FILTER  RACKS,  of  galvanized  iron  wire  with  rubber  ring,  to  hold  filter  paper  away  from  sides 

of  funnel  to  facilitate  rapid  filtration. 

No A  B  C  D 

Diameter,  inches 5  7  9  12 

Each 40  .50  .75  1.00 

5514.     FINGER  COTS,  Rubber. 

No A  B 

For men  women 

Per  dozen  . . '. 60  .60 

5520.  FIRST  AID  CABINET.  A  neat  hardwood  case,  8x12x3%  inches  deep,  containing:  one  1-inch 
gauze  bandage;  two  2-inch  gauze  bandages;  one  2-ineh  cotton  bandage  to  bind  other  dressings; 
one  can  mustard,  especially  prepared  for  emetics;  two  packages  absorbent  cotton;  one  package 
styptic  gauze,  medicated,  to  stop  bleeding;  one  package  surgical  gauze,  plain,  for  pads  and  com- 
presses; one  tourniquet,  to  stop  arterial  bleeding;  one  can  powdered  antiseptic  soap,  for  washing 
hands  and  wounds;  one  can  Becrosco  Ointment,  for  burns,  scalds,  cuts,  etc.;  one  can  Kapsikar 
Embrocation,  for  use  as  counter-irritant,  for  sprains,  strains,  congestion,  etc.;  one  package  court 
plaster;  three  safety  pins;  one  envelope  hooks  and  eyes,  to  hang  case  on  wall.  An  excellent 
cabinet  to  have  about  the  laboratory  for  treating  cuts  and  burns.  Complete  as  described  3.00 


244 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  5532. 


No.  5536. 


No.  5540. 


No.  5542. 


No.  5546. 
No.  5550. 


FLASKS,  ALL  KINDS 

5532.    FLASKS,  Flat  Bottom,  with  ring  neck. 

Capacity,  cc 120         250 

To  take  rubber  stopper,  No 1  3 

Each $0.14       .17 

5536.   FLASKS,  Flat  Bottom,  Resistance  Grade,  with  vial  mouth. 

Capacity,  cc 30 

To  take  rubber  stopper,  No 0 

Each 11 

Per  100  in  original  case 9.90 

Capacity,  cc 500 

To  take  rubber  stopper,  No 5 

Each 21 

Per  100  in  original  case 18.90 

5540.    FLASKS,  Flat  Bottom,  Pyrex  Glass,  with  vial  mouth. 

Capacity,  cc 50 

To  take  rubber  stopper,  No 0 

Number  in  original  case 192 

Each .15 

Per  dozen  in  original  case 1.62 

Capacity,  cc 700 

To  take  rubber  stopper,  No 6 

Number  in  original  case 36 

Each 36 

Per  dozen  in  original  case 3.89 

*Boxing  charged  at  manufacturer's  cost. 

5542.    FLASKS,  Flat  Bottom,  Pyrex  Glass,  with  heavy  ring  neck. 


360 

4 

.18 


500 

4 

.23 


60 

2 

.12 
10.80 
700 

6 

.29 
26.10 


120 

3 

.13 
11.70 
1000 

6 

.34 
30.60 


750 

5 

.29 

180 

3 

.14 
12.60 
1500 

8 

.42 
37.80 


1000 

5 

.36 

250 

4 

.15 
13.50 
2000 

9 

.50 
45.00 


Capacity,  cc 

To  take  rubber  stopper,  No. 
Number  in  original  case.  . .  . 
Each  . 


500 
5 
72 
.38 


700 
6 

36 
.47 

5.08 


Per  dozen  in  original  case 4.10 

*Boxing  charged  at  manufacturer's  cost. 

5546.    FLASKS,  Round  Bottom,  with  vial  mouth. 

Capacity,  cc 60 

To  take  rubber  stopper,  No 0 

Each 09 

Psr  100  in  original  case 8.00 

5550.    FLASKS,  Round  Bottom,  Pyrex  Glass,  with  vial  mouth. 

No A 

Capacity,  cc 100 

To  take  rubber  stopper,  No 2 

Number  in  original  case 84 

Each 17 

Per  dozen  in  original  cass 84 

*Boxing  charged  at  manufacturer 's  cost. 


1000 

7 

36 
.55' 

5.94 


1500 
7 

24 
.66 

7.13 


2000 

8 

18 

.78 

8.42* 


3000 

9 

12 

.99 

10.69* 


6000 
10 
12 

1.75 
18.90* 


1500 

7 

.42 

350 
5 

.19 
17.10 
4000 
9 

1.10 
99.00 


100 

150 

200 

300 

400 

500 

1 

1 

3 

4 

4 

6 

168 

108 

144 

96 

84 

72 

.16 

.18 

.20 

.23 

.26 

.29 

1.73 

1.94 

2.16 

2.48 

2.81 

3.13 

1000 

1500 

2000 

3000 

6000 

12000 

7 

7 

8 

9 

10 

10 

36 

24 

18 

12 

12 

6 

.43 

.51 

.60 

.76 

1.60 

3.00 

4.64 

5.51 

6.48* 

8.21* 

17.28* 

32.40* 

12000 
10 
6 

3.30 
35.64* 


120 

250 

500 

750 

1000 

2000 

2 

4 

5 

6 

6 

7 

.11 

.14 

.19 

.24 

.30 

.48 

10.00 

12.00 

15.00 

20.00 

27.00 

38.00 

B 

C 

D 

E 

F 

G 

H 

200 

300 

500 

700 

1000 

1500 

2000 

3 

4 

4 

7 

5 

7 

9 

144 

84 

48 

42 

30 

24 

18 

.22 

.28 

.37 

.45 

.56 

.71 

.79 

2.38 

3.02 

4.00 

4.86 

6.05 

7.67 

8.53* 

CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


245 


No.  5554. 


No.  5558. 


No.  5570. 


No.  5576. 


No.  5584. 


5554.    FLASKS,  Bound  Bottom,  Balloon  Form,  Resistance  Grade,  with  heavy  vial  mouth. 


Capacity,  cc  

100       250       500     1000     1500     2000     3000      4000 

To  take  rubber  stopper,  No  

5           6           7           8           7           9           9          10 

Number  in  original  ease  

108         96         72         36         ..         18         12 

Each  

13        .15        .21        .34        .46        .50        .75     .1.35 

Per  dozen  in  original  case  

$1.40      1.62     2.27      3.67      4.97      5.40      8.10     14.58 

5558. 

Flasks.  Round  Bottom,  Balloon  Form, 

Pyrex  Glass,  with  short  ring  neck. 

Capacity,  cc  

.     200     500     1000     1500     2000      3000      5000     12000     22000 

To  take  rubber  stopper,  No  

368           9         10          10          11           11           12 

Number  in  original  case  

.     144        72        36         24         18          12            6             6             8 

Each  

.      .24       .38       .55        .66        .78         .99       1.29        3.00        6.60 

Per  dozen  in  original  case  

2.59     4.10     5.94     7.13      8.42     10.69     13.93      32.40      71.38 

5570. 

FLASKS,  Erlenmeyer,  Resistance  Grade. 

Capacity,    cc  

60       120      180        250       350       500       700     1000     1500     2000 

To  take  rubber  stopper,  No. 

234            5567799 

Each  

12        .13       .14        .15        .19        .21        .29        .34        .42        .50 

Per  100  in  original  case....     10.80    11.70   12.60    13.50    17.10    18.90   26.10   30.60   37.80    45.00 

5576. 

FLASKS,  Erlenmeyer,  Pyrex  Glass. 

Capacity,  ee  

25         50        100       150       200       250       300       500 

To  take  rubber  stopper,  No  

001345566 

Number  in  original  ease  

360       276       180       252       144       132       132        72 

Each  

13        .14        .15        .16        .18        .20        .21        .27 

Per  dozen  in  original  case  

1.40      1.51      1.62      1.73      1.94      2.16      2.27      2.92 

Capacity,  cc  

600        750       1000      1500       2000        3000       4000 

To  take  rubber  stopper,  No  

6            7            8            9            10            10           10 

Number  in  original  case  

60          48          36          24           24            15           12 

Each  

29         .33         .42         .51         .60           .79         1.00 

Per  dozen  in  original  case  

3.13       3.56       4.54       5.51       6.48*       8.53*     10.80* 

*Boxing  charged  at  manufacturer's  cost. 

5573.    FLASKS,  Erlenmeyer,  Pyrex  Glass,  with  extra  wide  mouth. 

Capacity,  cc 250  500  750 

To  take  rubber  stopper,  No 7  10  10 

Number  in  original  case 132  60  48 

Each 20  .27  .33 

Per  dozen  in  original  case 2.16  2.92  3.56 

5584.     FLASKS,  Erlenmeyer,  with  Ground  Glass  Stopper,  Resistance  Grade. 

Capacity,  cc 60            125  250  500  1000 

Each  .                                                                                         .45             .50  .60  .65  .90 


246 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  5602. 


No.  5606. 


No.  5608. 


No.  5610. 


No.  5618. 


No.  5622. 


No.  5624. 


No.  5632. 


5600.  FLASK,  Acetylizatiou,  with  ground  in  condensing  tube,  for  assaying  menthol  in  oil  of  pepper- 
mint. Capacity,  about  150  cc;  length  of  condensing  tube,  100  cm.  (See  United  States  Phar- 
macopoeia for  1916,  page  296) $1.50 

5602.    FLASKS,  Assay  Beaker  Flasks,  Resistance  Grade,  high  form,  with  lip. 

Capacity,  cc 125  250  500  1000 

Number  in  original  case 180  132  72  36 

Each 13  .17  .25  .42 

Per  dozen  in  original  case 1.40  1.84  2.70  4.54 

5606.  FLASK,  Cassia,  with  ground  glass  stopper,  for  assaying  cinnamic  aldehyde.  Total  capacity,  about 
200  cc;  neck  graduated  to  10  cc  in  i/10  cc  divisions.  (See  United  States  Pharmacopoeia  for  1916, 

page  289) 2.25 

5608.     FLASKS,  Copper,  heavy,  polished,  with  ring  neck.     Capacity,  ce. .         250         500         1000       2000 

Each 2.30        2.90         3.70        5.00 

5610.  FLASKS,  Copper  Oxide,  with  ground  glass  stopper,  and  glass  cap  ground  on;  for  keeping  copper 
oxide  pure  for  use  in  analysis. 

Capacity,   cc 125  250  500 

Each 1.50  1.80  2.40 

5618.     FLASKS,  Distilling,  Pyrex  Glass,  with  side  tube  in  middle  of  neck. 

Capacity,  cc 50  125  250  500  1000  1500  2000  3000 

Each 54  .60  .80  .96  1.30  1.85  2.10  2.60 

Note: — If  specified  when  ordering,  side  tube  may  be  located  where  desired. 

5620.  FLASKS,  Distilling,  Opaque  Fused  Silica,  regular  form  with  side  arm  in  center  of  neck.  Liquid 
levels  are  readily  visible. 

Capacity,   cc 50  100  250  500 

Each  . . '. 4.05  5.95  9.40  11.25 

5622.     FLASKS,  Distilling,  Claissen's. 

Capacity,  cc 10  60  125  250  500 

Each 40  .60  .70  .80  1.20 

5624.  FLASKS,  Distilling,  Engler's,  Pyrex  Glass,  for  fractional  distillation  of  creosote  and  petroleum 
oils.  Made  to  standard  dimensions,  according  to  the  American  Society  for  Testing  Materials 
and  the  U.  S.  Bureau  of  Mines. 

Capacity,  cc 100  200  250 

Each  . . " 55  .65  .80 

5632.  FLASKS,  Distilling,  Hempel's,  Pyrex  Glass,  for  the  distillation  of  creosote.  (See  Circular  112, 
Forest  Service  of  United  States  Department  of  Agriculture.)  Capacity,  500  cc 1.20 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


247 


No.  5644.  Nos.  5646-50.  No.  5654. 


No.  5658. 


No.  5664. 


No.  5666. 

Capacity,  500  ce. 


250 
1.10 


500 
1.50 


5636.     FLASKS,  Distilling,  Ladenburg's,  with  three  bulbs  in  neck. 
5640.     FLASKS,  Distilling,  Lunge's  Tar,  with  trap. 

Capacitv,   cc.  .  ............................       125 

Each  .  .  '.  ......................................................  75 

Note:  —  Other  types  of  distilling  flasks  will  be  made  to  specifications. 

5644.     FLASK,  Elutriating,  Benningsen,  with  neck  graduated  to  40  ec  in  1  cc  divisions.  Capacity,  about 
4oO  cc  .............................................................................      1-50 

5646.    FLASKS,  Extraction,  Resistance  Grade,  flat  bottom,  with  wide  mouth  and  vial  neck. 

Capacity,  cc  ............................................         60  125  175  250 

Outside  diameter  of  neck,  mm  ...........................         31  40  43 

To  take  rubber  stopper,  No  .............................  8  9 

Number  in  original  case  ................................       192  120  144  96 

Each  ...................................................  11  .13  .17  21 

Per  dozen  in  original  case  ...............................      1.19          1.40          1.84          2.27 

5650.     FLASKS,  Extraction,  Pyrex  Glass   flat  bottom,  with  wide  mouth  and  vial  neck. 

Capacity,  cc  ...................................          50  100  150  250  500 

To  take  rubber  stopper,  No  ....................  6  6  8  10 

Number  in  original  case  .......................        168  120  108  120  60 

Each  ..........................................  13  .15  .17  .19  .29 

Per  dozen  in  original  case  ......................       1.40          1.62          1.84          2.05          3.13 

5654.     FLASKS,  Extraction,  Knorr's  Original  Form,  for  mercury  seal;  capacity,  100  ce  .........  50 

5656.     FLASKS,  Extraction.  Knorr's,  as  modified  by  Walter  and  Goodrich,  with  two  holes  in  neck  for 
return  flow  of  ether.     Capacity,  100  cc  .............................................  50 

5658.     FLASKS.  Extraction,  Sy's  Form,  with  trough  for  mercury  seal  and  with  holes  in  neck  for  return 
of  ether.     Capacitv.  100  cc  ..........................................................  80 

For  other  EXTRACTION  FLASKS,  see  Nos.  5209  and  5228. 
5664.    FLASKS,  Filtering,  Erlenmeyer  form,  of  he  ivy  glass,  with  side  neck, 

Capacity,  cc  .............................  "  ............        250  500  1000  2000 

Each..'.  ..............................................  50  .65  1.00  1.95 

5666.     FLASKS,  Filtering,  same  as  No.  5664,  with  glass  stop-cock  on  side  neck. 

Capacity,  ce  ..................................................       250  500  1000 

Each  .  .  '.  .....................................................      2.50  2.80  3.00 

5668.     FLASKS,  Filtering,  same  as  No.  5664,  with  side  tube,  and  funnel  ground  in  neck. 

Capacity,  cc  ..................................................       250  500  1000 

Each..'.  .....................................................      1.65  2.00  2.75 

5672.     FLASK,  Gray's  Carbon  Residue,  Opaque  Fused   Silica,   for  determining   the   carbon  residue   of 
lubricating  oils.     Capacity,  50  cc.     May  be  used  repeatedly,  as  the  residue  can  be  burned  out 
with  oxygen.     (See  Report  of  Committee  D-2  of  the  American  Societv  for  Testing  Materials  for 
1914     ...  ........................................................................         4.06 

FLASKS,  Gas  Generating,  see  Gas  Generators. 


248 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  5694.  No.  5698.  No.  5704.  No.  B708. 

5674.     FLASKS,  for  Iodine  Number  Determination  of   Oils,   Resistance   Grade,   Erlenmeyer  form,  with 
flaring  lip  and  hollow  stopper  ground  deep  in  neck  to  form  reservoir. 

Capacity,  cc 125  250  500 

Each $0.90  1.00  1.20 

5678.     FLASKS,  Joliet,  for  use  in  analysis  of  iron  and  steel.     Of  heavy  glass,  made  to  resist  heat. 

Capacity,  cc 500  1000  2000 

Each •  .29  .43  .60 

5682.     FLASKS,  Kjeldahl,  Pyrex  Glass,  with  long  neck  and  round  bottom.- 

Capacity,  cc ~. .         300  500  800 

To  take  rubber  stopper,  No : 5  6  6 

Total  length,  mm 298  327  365 

Number  in  original  case 60  36  36 

Each .28  .37  .45 

Per  dozen  in  original  case 3.02  4.00  4.86 

5686.     FLASK,  Kjeldahl,   Copper,  heavy,  with  flat  bottom.     Diameter,   4   inches;    height,   8%    inches; 

capacity,  1000  cc 4  25 

5690.     FLASKS,  Low's,  for  Copper  Determinations  Pyrex  Glass,  improved  form,  with  flaring  neck. 

Capacity,  cc 180  250 

Number  in  original  case 144  108 

To  take  rubber  stopper,  No 5  6 

Each 25  .30 

Per  dozen  in  original  case 2.70  3.24 

5694.     FLASKS,  Melting  Point  or  Oxygen,  of  Pyrex  Glass,  with  long  necks.     Can  be  used  for  high  tem- 
peratures.     Capacity,  cc 125  250  500  1000 

Each 19  .26  .37  .56 

5698.     FLASK,  Moisture,  of  Pyrex  Glass,  for  use  in  official  Brown-Duvel  Moisture  Tester  for  determin- 
ing moisture  in  grain.     Capacity,  1000  cc.     (See  Circular  No.  72,  Bureau  of  Plant  Industry, 

United  States  Department  of  Agriculture) 1.50 

5702.     FLASK,   Moisture,   Copper,   single   wall,   for  use    in    Brown-Duvel    Moisture    Tester.     Capacity, 

1000  cc 3.00 

5704.     FLASK,  Moisture,  Copper,  double  wall,  for  use  in  Brown-Duvel  Moisture  Tester,  for  determining 
moisture  in  flour  and  ground  samples.     Capacity  of  the  inner  vessel,  900  cc.     (See  Bulletin  No. 

56  of  the  Bureau  of  Plant  Industry,  United  States  Department  of  Agriculture) 6.00 

5708.     FLASKS,  Phosphorus,  Erlenmeyer  form  with  narrow  neck,  Resistance  Grade.     Used  extensively 
in  iron  analysis  for  determination  of  phosphorus.      Capacity,  400   cc;    to   take   rubber   stopper 

No.  4.     Number  in  original  case,  96 Each.        .25 

Per  dozen  in  original  cas?      2.70 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


249 


No.  5736. 


No.  5740. 


No.  5762. 


No.  5764. 


No.  5766. 


5712.     FLASKS,   Transparent  Quartz,  regular  shape,  flat  bottom,  with  long,  narrow  neck. 

Approx.  capacity,  cc..      15  25  50  100  150  200  250  500 

Each " $3.30          4.50  6.00         10.80         14.40         19.20         22.80         30.00 

5714.     FLASKS,  Transparent  Quartz,  flat  bottom,  with  short,  wide  neck. 

Approx.  capacity,  cc..      15  25  50  100  150  200  250  500 

Each 3.30  4.50  6.00         10.80         14.40         19.20         22.80         30.00 

5716.     FLASKS,  Transparent  Quartz,  round  bottom,  with  long,  narrow  neck. 

Approx.  capacity,  cc..      15  25  50  100  150  200  250  500 

Each " 3.30  4.50  6.00         10.80         14.40         19.20         22.80         30.00 

5718.     FLASKS,  Transparent  Quartz,  round  bottom,  with  short,  wide  neck. 

Approx.  capacity,  cc..      15  25  50  100  150  200  250  500 

Each....; " 3.30  4.50  6.00         10.80         14.40         19.20         22.80         30.00 

5720.     FLASKS,  Transparent  Quartz,  Erlenmeyer  form. 

Capacity,  cc 50  100  200  500 

Each..". 6.00  10.80  19.20  30.00 

5724.  FLASKS,  Opaque  Fused  Silica,  flat  bottom,  with  vial  mouth.  These  are  sufficiently  clear  to 
make  visible  the  level  of  liquid  inside,  and  are  specially  adapted  for  direct  heating  by  electric 
resistance  wires.  Very  useful  for  boiling  at  high  temperatures,  destructive  distillation,  etc. 

Capacity    cc.       .  50  100  200  250  500 

Each..'. 2.75  4.00  5.00  6.25  7.50 

5728.  FLASKS,  Soil  Analysis,  Pyrex  glass,  Erlenmeyer  form,  with  condenser  tube  100  cm  long  ground 
in  neck. 

Capacity,  cc 250  500 

Each  . . '. 1-40  1.65 

5732.  FLASK,  Sulphur,  Pyrex  glass,  for  use  in  detecting  sulphured  grain.  Consists  of  an  Erlenmeyer 
flask  with  ground  iu  stopper  and  delivery  tube.  Capacity,  500  cc.  (See  Circular  111  of  the 

Bureau  of  Plant  Industry,  United  States  Department  of  Agriculture) 1.95 

5736.     FLASKS,  Sulphur,  flat  bottom,  with  side  neck  bent  at  right  angle,  as  used  in  determining  sulphur 

in  iron  and  steel.     Capacity.  500  cc 75 

5740.  Flasks,  Johnson's  Sulphur,  Resistance  Grade,  of  heavy  glass  with  heavy  vial  neck.  Used  widely 
for  determining  sulphur  in  iron  and  steel  analysis.  Capacity,  270  ce;  neck  of  size  to  take  No.  7 

rubber  stopper;  number  in  original  case,  96 Each       .22 

FLASKS,  Vacuum,  see  Vacuum  Tubes.  Per  dozen  in  original  case     2.38 

5762.    FLASKS,  Volumetric,  accurately  graduated  to  contain,  without  stopper. 

Capacity,    ec 10         25         50        100         200         250         300         500         1000         2000 

Each..'. 45        .45        .50         .50          .55          .60          .80          .85          1.00          2.00 

5764.    FLASKS,  Volumetric,  same  as  Xo.  5762,  but  with  glass  stopper  ground  in. 

Capacity,    cc 10         25         50        100         200         250         300         500         1000         2000 

Each..'. 75        .75        .80         .85          .90          .95         1.15        1.20         1.40          2.50 

5766.    FLASKS,  Volumetric,  with  glass  stopper  and  two  marks  on  neck,  graduated  both  to  contain  and 

deliver.     Capacity,  cc , 100  250  500  1000 

Each 90  1.10  1.40  1.70 


250 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  5768. 


.: 


- 


No.  5770. 


No.  5772. 


No.  5780. 


No.  5784. 


No.  5786. 


No.  5788. 


No.  5792. 


No.  5846. 


5768.     FLASK,  Volumetric,  Foots  Flask,  graduated,  for  determining  fatty  acid  in  cottonseed  by  saponi- 

fication.     Capacity  of  bulb,  250  ce $2.25 

5770.     FLASK,  Volumetric,  of  heavy  glass,  with  short  neck,  and  mark  low  on  neck.     Widely  used  in 

fertilizer  laboratories.     Capacity,  250  cc 65 

5772.     FLASK,  Volumetric,  graduated  to  deliver  58.3   ec,  for  determining  degree  of  alkalinity  in  feed 

water  for  boilers 80 

5776.     FLASK,  Volumetric,  conical  shape  with  enlarged  mouth,  as  used  in  oil  analysis.     Capacity,  100  cc. 

1.00 

5780.     FLASK,  Volumetric,  with  wide  neck,  for  determination  of  insoluble  phosphoric  acid.     Capacity, 

200  cc;  diameter  of  neck  inside,  25  mm .65 

5784.     FLASKS,  Volumetric,  Sugar,  with  two  marks  on  neck,  without  stopper. 

Graduated  at,  cc 50  &  55  100  &  110  200.&  220 

Each .60  .70  .80 

5786.     FLASK,  Volumetric,  Sugar,  Bates'  Form,  pear  shape  with  funnel  top.     Capacity,  100  cc.  .       .65 
5788.     FLASKS,  Volumetric,  Sugar,  Kohlrausch  Form,  with  enlarged  mouth,  and  one  mark  on  neck. 

Graduated  at,  cc 100  200  200.6  201.2  201.4 

Each 58  .60  .70  .75  .75 

5792.  FLASKS,  Volumetric,  Gile's  Form,  glass  stoppered,  with  bulb  in  neck  and  two  marks.  Used  ex- 
tensively for  making  normal  solutions,  as  the  10  per  cent,  extra  volume  in  the  bulb  may  be  used 
for  checking,  leaving  an  exact  volume  for  correction. 

Graduated  at,  ce 500  &  550  1000  &  1100  2000  &  2200 

Each 2.10  2.80  4.00 

5812.  FLASKS,  Volumetric,  Precision  or  Normal,  without  stopper,  graduated  to  meet  the  requirements 
of  the  United  States  Bureau  of  Standards,  with  unofficial  factory  certificate. 

Graduated  to  contain,  cc 50  100  250  500  1000          2000 

Each 90  1.10  1.50  1.90  2.40  3.00 

5814.  FLASKS,  Volumetric,  Precision  or  Normal,  same  as  No.  5812,  but  standardized  by  the  United 
States  Bureau  of  Standards,  with  certificate. 

Graduated  to  contain,  cc 50  100  250  500  1000          2000 

Each 1.55  1.85          2.50  3.15  4.30  5.00 

5818.     FLASKS,  Volumetric,  Precision  or  Normal,  same  as  No.  5812,  but  with  glass  stopper. 

Graduated  to  contain,  cc 50  100  250  500  1000          2000 

Each 1.30  1.50  1.90  2.25  3.00  3.50 

5820.  FLASKS,  Volumetric,  Precision  or  Normal,  same  as  No.  5818,  but  standardized  by  the  United 
States  Bureau  of  Standards,  with  certificate. 

Graduated  to  contain,  cc 50  100  250  500  1000          2000 

Each 2.10  2.25  3.15  3.75          5.00  5.70 

FLASK  HEATER,  Electric  Water  Bath,  see  No.  14296  De  Khotinsky  Electrically  Heated  Water 

Bath. 

FLASK  HEATER,  Electric  Hot  Plate,  see  No.  7514  Heater,  Combination  Electric. 

5846.  FLASK  HEATERS,  of  sheet  iron,  with  asbestos  strips  fastened  to  sides,  and  openings  for  ventila- 
tion. 

Diameter,  inches    4%  5  6  7%  8*4          10V2 

Each.... 80          1.10          1.30          1.60          1.80          2.20 

FLASK  HOLDER,  Suberite,  see  Cork  Rings,  No.  3296. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


251 


586& 


IM*. 


Ko.  5868. 


5870. 


Nos.  5869-70. 


FLOTATION  MACHINE,  Brauu  (patented).  A  miniature  machine  suitable  for  laboratory  tests, 
built  similar  to  the  standard  size,  producing  every  effect  essential  to  determine  to  what  extent 
an  ore  'will  lend  itself  to  flotation.  The  machine  is  constructed  of  heavy  cast  iron,  the  interior 
consisting  of  a  hollow  cylinder  which  is  coated  with  a  special  hard  baked  enamel,  a  wooden 
drum  provided  with  a  series  of  longitudinal  air  slots,  and  a  larger  number  of  longitudinal 
riffles  running  the  entire  length  of  the  drum.  An  iron  strip  perforated  with  small  holes  placed 
tangentially  to  the  periphery  of  the  drum  admits  the  pulp  into  the  frothing  box.  The  machine 
is  split  in  the  center,  the  top  being  hinged,  which  permits  ready  access  to  every  working  part 
and  facilitates  cleaning.  When  closed  the  top  is  held  in  place  by  thumb  bolts,  rubber  gaskets 
insuring  a  tight  joint.  For  taking  samples  of  tailings  a  small  hole  is  provided  in  the  bottom 
of  the  frothing  box,  which  is  closed  by  means  of  a  stopper.  Capacity,  from  one  to  two  pounds 
of  drv  product;  shipping  weight,  185  pounds;  dimensions  27x21x12  inches;  with  tight  and  loose 
pulleys,  6x2  inches;  speed  recommended,  400  r. p. m.  Complete  with  directions  for  use..  fifcOP 

FEEDER  FOR  OILS,  Braun  Mechanical  Disk,  for  nse  with  Xo.  5868.  The  problem  of  successful 
flotation  depends  to  a  great  extent  upon  the  regularity  of  the  flow  of  reagents.  The  Braun 
Mechanical  Disk  Feeder  eliminates  detrimental  results  due  to  irregularity  in  feeding  reagents. 
A  disk  of  iron  is  mounted  on  a  shaft  and  revolved  within  an  iron  tank.  A  thin  film  of  oil  ad- 
heres to  the  finished  surface  of  the  disk  as  it  revolves  through  the  oil.  A  portion  of  this  film 
is  transferred  to  the  trough  through  which  it  flows  into  the  flotation  machine.  The  feed  is 
regulated  by  adjusting  the  position  of  the  trough  by  means  of  two  micrometer  screws.  Grit, 
sludge,  or  any  foreign  matter  cannot  choke  it.  Fitted  with  tight  and  loose  pulleys.  Shipping 
weight,  120  pounds;  length,  23  inches;  width,  16  inches;  height,  15  inches.  Complete  with 
directions  for  nse 54.00 

FEEDER  FOR  ACIDS,  Braun  Mechanical  Disk,  for  use  with  Xo.  5868,  of  same  construction  and 
dimensions  as  Xo.  5869,  but  with  disk  of  lead,  lead  lined  tank,  and  trough  of  bronze  to  resist 
action  of  acids.  Shipping  weight,  160  pounds  80.00 


252 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  5930. 


No.  654. 


FLOUR  TESTING  APPARATUS 


248.     APRON,  Duck,  of  heavy  fine  material,  with  bib  and  attached  tie  string,  to  protect  clothing  from 

flour  and  grease.     Length,  50  inqhes $0.85 

5906.     BAKING  CYLINDERS,  as  designed  by  the  Columbus  Laboratories,  with  graduated  indicator  and 

detachable  cup  for  definite  capacity.     Two  are  desirable  for  comparative  tests each     7.50 

For  Tongs  for  No.  5906  Baking  Cylinders,-  see  No.  6020. 
BALANCE,  Analytical,  for  Flour  Testing,  see  Nos.  462,  466,  486  and  488. 
BALANCE,  Porcelain  Pan,  for  general  use,  see  No.  648. 

652.  BALANCE,  Baker's  Scale,  same  as  No.  648  with  the  exception  of  the  scale  pans  which  are  of 
nickeled  brass,  15  cm  in  diameter,  and  of  shallow  pan  style.  The  graduated  beam  has  a  range 
of  10  grams  in  l{0  gram  divisions,  and  brass  weights  from  10  grams  to  100  grams  are  supplied, 
conveniently  fitted  into  a  projecting  holder.  The  capacity  is  2,000  grams.  Sensibility  is  guar- 
anteed to  be  l/io  gram.  Actual  tests  show  a  much  greater  sensibility 10.00 

656.     FUNNEL  SCOOP  and  Counterpoise,  accurately  adjusted,  for  use  with  No.  648  Balance.     Scoop 

holds  approximately  one  kilogram  of  flour 2.50 

654.     BALANCE,  Flour  Test,  consisting  of  No.  648  Balance  with  the  addition  of  No.  656  Funnel  Scoop 

and  Counterpoise 10.00 

826.  WEIGHING  SCOOPS,  of  aluminum,  with  large  lip  and  counterpoise  for  use  in  weighing  flour  for 
protein  tests;  size  B  holds  approximately  12  grams  of  flour,  size  C  about  50  grams. 

No A  B  C 

Capacity,  about,  cc 10  30  125 

Each 2.25  2.50  4.00 

BALANCE  WEIGHTS  for  Flour  Testing,  see  Nos.  714  and  718. 

BOTTLES,  Sample,  for  Flour,  see  general  heading  Bottles. 

CARBONIC  ACID  APPARATUS,  for  testing  Baking  Powder,  see  general  heading  Carbon  Dioxide 

Determination  Apparatus. 

5918.     CUBIC  INCH  and  Counterpoise.     Metal  box  of  exact  inside   dimensions  with   accurate   counter- 
poise        6.50 

EXTRACTION  APPARATUS,  see  general  heading  Extraction  Apparatus. 
FLOUR  CONTAINER,  of  galvanized  iron,  see  Bins  and  Containers. 
5926.     FLOUR  SLICK,  of  finest  quality  spring  steel,  highly  polished  and  tapered  to  a  thin  flat  edge. 

Size,  2%x6  inches ". 75 

FURNACE,  Ashing,  see  general  heading  Furnaces,  Muffle. 
5930.     JARS,  Chidlow  Expansion,  for  testing  the  rising  qualities  of  dough. 

No A  B  C 

Capacity,   cc 1000  2000  3000 

Graduated  in,  ce 20  50  50 

Each  . . 2.50  2.90  3.20 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


253 


No.  5938. 


No.  5960. 


No.  5933. 


No.  5962. 


No.  5972. 


5932.  JAE,  CMdlow  Gas  Collection,  graduated  to  1800  ce  in  20  cc  divisions.     Complete  with  accessory 

bottles,  tubing  and  rubber  stoppers $6.50 

5933.  JAE,  Chidlow  Gas  Collection,  the  graduated  jar  only  of  No.  5932 5.00 

JARS,  Proofing  and  Dough  Mixing,  see  Jars,  Stoneware. 

5938.  KNIFE  for  mixing  dough.  Substantially  made,  with  ebony  handle  and  heavy  hand  forged  steel 
blade  6  inches  long .80 

MAGNIFIERS  for  examining  flour,  bolting  cloth,  etc.,  see  general  heading  Magnifiers. 

MILLS  for  grinding  wheat  samples,  see  Crushing  and*  Grinding  Apparatus. 

MOISTURE  TESTERS  for  Flour,  see  No.  7360,  etc. 

NITROGEN  DETERMINATION  APPARATUS,  see  general  heading  Nitrogen  Determination 
Apparatus. 

OVENS,  Baking,  see  general  heading  Ovens. 

5960.     PANS,  Baking,  sanitary,  rounded  corners  and  bottoms. 

No A  B 

Top  inside,  inches 8V2x4%  9%x5V2 

Bottom  inside,  inches 7%x3%  8*£x4:1/4 

Depth,  inches 2%  3 

Each .25  .35 

Per  dozen 2.50  3.50 

5962.     PANS,  Baking,  laboratory  type.     Depth,  5%  inches;    width  at  top,  3%   inches;   at  bottom,  2% 

inches;  length  at  top,  6%  inches;  at  bottom,  5%  inches each  .70 

per  dozen    7.00 

3844.  PANS,  Washing,  of  graniteware,  round,  with  flat  bottom,  for  use  in  washing  out  gluten  from 
flour. 

Capacity,  quarts i .,  j  9 

Each 30  .35  .40 

3966.     PLATE,  glass,  for  slick  test,  3x5  i»ches 10 

1814.     PORCELAIN  BOWL  for  use  in  washing  out  gluten,  so-called  pint  size 35 

5970.     PORCELAIN  CUP,  without  handle,  used  in  gluten  washing  and  flour  mixing 25 

5972.  PORCELAIN  PLATE,  for  use  in  covering  stone  jars  in  proofing  cabinet.  Diameter,  8>4  inches 
.20 


254 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


5978. 
5970. 


Nos.  5978-9. 

PROOFING  CABINETS,  Despatch  Electric,  designed  especially  for  dough  raising  in  wheat  and 
flour  testing  laboratories.  They  are  made  of  kiln  dried  lumber,  have  glass  doors,  removable 
slat  shelves,  asbestos  lined  heater  chamber  and  are  equipped  with  Despatch  Open  Wire  Elec- 
tric Heaters.  Heaters  are  controlled  by  a  two-point  regulating  switch  system  by  means  of 
which  heat  can  be  held  at  any  temperature  desired.  The  cases  are  finished  in  white  enamel 
and  are  complete  with  thermometers.  All  sizes  are  28  inches  high  and  14  inches  deep. 

Despatch  No 520  524  526  527 

Length,  inches 48  60  72  96 

Number  of  doors 2345 

For  110  volts $30.00  65.00  85.00  110.00 

For  220  volti .  .  50.00  65.00  85.00  110.00 


No.  5982. 

5982.  PROOFING-  CABINETS  for  Test  Baking,  Despatch  Electric,  of  polished  steel,  with  glass  observa- 
tion doors  and  Despatch  Open  Wire  Heaters  for  one  heat.  The  walls  are  lined  with  asbestos 
board.  Length,  29  inches;  depth,  11  inches;  height,  10  inches;  power  consumption,  200  watts. 

Complete  with  snap  switch  and  fused  entrance  switch.      No A  B 

For  volts HO  220 

Each 27.50  27.50 

PROTEIN  DETERMINATION  APPARATUS,  see  general  heading  Nitrogen  Determination  Ap- 
paratus. 

5988.  SAMPLE  MAILING  CASES,  of  heavy  cardboard  with  tin  bottom  and  tin  screw  top.  Thickly 
coated  within  with  paraffine,  with  paraffined  cardboard  cap  for  top,  so  that  the  tube  is  air 
tight.  Will  not  lose  or  take  on  moisture  in  transit.  2  inches  in  diameter  by  5  inches  long. 

Shipping   labels    included per     100     8.00 

per     500  37.50 
per  1000  70.00 

5990.     SAMPLE  MAILING  CASES,  same  as  No.  5988,  but  2%  inches  in  diameter per    100     9.00 

SCOOPS  for  Flour,  see  general  heading  Scoops.  per     500  42.50 

SIEVES  for  Flour,  see  general  heading  Sieves.  per  1000  80.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A, 


255 


No.  12096. 


No.  12098. 


No.  13514. 


No.  12580 


No.  6026. 


No.  13558. 


No.  6020. 


12096.  SIEVE  FRAME,  without  bottom,  but  with  brass  ring  for  holding  bolting  cloth,  5  inches  in  diam- 
eter     , $1.00 

12098.  BOLTING  CLOTH,  Silk,  for  making  sieves,  etc.  The  well  known  Anchor  Brand.  Standard  weight, 
40  inches  wide. 

No 2  5  7  9          11         13         15         18         20        25 

Mesh  per  linear  inch 52         64         80         96        116       130       148       168       173      200 

Per  linear  foot 2.40     2.80     3.00     3.20     3.80     4.60     5.40     7.20    10.00    11.00 

SLICKS,  Flour,  see  No.  5926. 
12580.  SPATULA,  Steel,  special  4  inch  blade,  with  wooden  handle,  designed  particularly  for  mixing  a 

small  dough  ball  for  gluten  and  absorption  ,ests 90 

For  other  SPATULAS,  see  general  heading  Spatulas. 
13514.  THERMOMETER,  Bake  Oven,  of  glass  with  5  inch  flanged  metal  scale  with  white  filled  figures, 

mounted  on  round  disk  metal  base  with  asbestos  mat  attached.     Range  100°  to  600°  F 1.50 

13558.  THERMOMETER,  Dough  Testing,  of  glass  in  7  inch  nickel-plated  iron  case,  with  11  inch  steel 
stem     The  scale  is  of  silvered  metal  with  black  filled  figures  and  graduations.     Range,  30°  to 

8.00 


120  "F. 


0020. 
6026. 


TONGS,  Cylinder,  for  use  with  No.  5906  Baking    Cylinder.      Length,    24    inches,    with    special 


,1aws 


1.10 


VOLUME  OF  LOAF  APPARATUS,  for  determining  the  volume  of  loaves  of  bread  by  displace- 
ment of  flax  or  other  seed.  Consists  of  a  vessel  of  known  capacity,  sufficiently  large  to  con- 
tain loaves  baked  in  Baking  Pans  Nos.  5960  and  5962,  having  an  upright  tube  with  graduated 
glass  face  and  an  auxiliary  funnel.  In  use,  the  bread  is  placed  in  the  first  container,  which 
is  then  filled  level  full  with  seed.  The  seed  is  then  emptied  into  the  auxiliary  funnel,  and 
from  this  funnel  flows  evenly  into  the  measuring  vessel.  From  the  height  to  which  the 
seed  rises  on  the  graduated  face  of  this  vessel,  the  volume  of  the  loaf  may  be  read  directly 
without  calculation.  Of  polished  brass  with  suitable  support,  graduated  in  cubic  centimeters 

for  loaves  ranging  from  1500  to  3000  cc  in  volume 32.50 

6030.     ZINC  PLATES,   for  gluten  testing,  of  thin  sheet  zinc,  2}*>  inches  square.     In  sets  of  twelve, 
numbered  1  to  12 Per  set    1.00 


256 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6068. 


No.  6090. 


No.  6092. 


6036.  FOIL,  Aluminum  Leaf,  for  electroscopes,  etc.;  in  books  of  25  leaves,  5x5  inches. Per  book     §0.45 

6038.  FOIL,  Dutch  Metal  (imitation  gold  leaf),  in  books  of  25  leaves,  4x4  inches Per  book         .40 

6040.  FOIL,  Gold  Leaf  (pure),  for  electroscopes,  etc.;  in  books  of  25  leaves,  4x4  inches. Per  book       1.00 
FOIL,  Platinum,  see  Platinum  Ware. 

FOLIN  APPARATUS,  see  Ammonia  Absorption  Apparatus;  Urine  Analysis  Apparatus. 
838.     FOECEPS,  Brass,  ivory  tipped,  curved  points,  for  handling  weights.    Length,  about  100mm  1.50 

840.     FORCEPS;  Brass,   curved  points,   plain.     Length,  about  95  mm 25 

1486.     FORCEPS,  Blowpipe,  nickel-plated  with  platinum  tips.     Length,  5%  inches.     Price  dependent 

upon  market  price  of  platinum. 
6058.     FORCEPS,  Bottle,  nickel-plated,  extra  length,  for  removing  articles  from  bottles  or  jars.     With 

corrugated  points  and  handles.     Length,   mm    200          250 

Each    1.80        2.00 

6060.     FORCEPS,  Cover-Glass,  thin  bent  blades,  file  back,  nickel-plated.    Length,  105  mm 80 

6062.     FORCEPS,  Cover-Glass,  with  straight  blades  ground  thin  and  guide  pin.    Length,  115  mm        .70 

6064.     FORCEPS,  Cover-Glass,  self-closing,  with  thin,  bent  blades.     Length,  125  mm 1.20 

6066.     FORCEPS,  Cover-Glass,  Cornet's,  self-closing,  of  spring  brass,  nickel-plated.   Length,  115mm      .40 
6068.     FORCEPS,  Cover-Glass,  Kalteyer's,  of  spring  brass  wire,  nickel-plated,  for  staining  on  cover- 
glass.     Length,   100  mm .45 

6070.     FORCEPS,  Cover-Glass,  Novy's,  of  steel  nickel-plated,  with  corrugated  handles,  with  one  blade 

flat,  the  other  curved  and  pointed.     With  guide  pin.     Length,  115  mm 85 

6072.     FORCEPS,   Cover-Glass,  Novy's,  similar  to  No.    6070   but   with    locking    device.      Length,    115 

mm     1.50 

6074.     FORCEPS,  Cover-Glass,  Stewart's  original  form,  of  steel  wire,  nickel-plated.    Length,  115  mm       .20 
6076.     FORCEPS,   Cover-Glass,  Stewart's,  with  ring;  of  steel  wire,  nickel-plated.    Length,  115  mm    .18 

FORCEPS,  Dissecting,  see  Dissecting  Instruments. 
6080.     FORCEPS,    Pinning,    bent    blades,    corrugated  points  and  handles.     Length,  110  mm....      1.35 

6082.     FORCEPS,   Pinning,   Blake   Form,   for   heavy  work.     Length,  125  mm 85 

6086.     FORCEPS,  Platinum  Tipped,  for  general  laboratory   work,  with  corrugated  handles.     Length, 

125  mm.     Price  dependent  upon  market  price  of  'platinum about    12.50 

6090      FORCEPS,  Slide,  Kirkbride's,  for  staining  on  slide,   of  steel  wire,   nickel-plated.     Length,   120 

mm     12 

6092.    FORCEPS,  Steel,  heavy,  for  general  laboratory  work.      Length,  inches 5  6 

Each $0.09  .15 

6094.     FORCEPS,  Brass,  same  style  as  No.  6092.     Length,    5   inches 18 

FREEZING  POINT  APPARATUS,  see  Physical  Chemistry  Apparatus. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


257 


No.  6100. 


No.  6102.      No.  6106.   No.  6112.      No.  6114. 


No.  6116. 


0 


No.  6118. 


No.  6120. 


No.  6124. 


No.  6126. 


FUNNELS,  ALL  KINDS 

6100.    FUNNELS,  Agateware. 

No A  B  C  D            E 

Capacity,   pints    %  1  2  4 

Diameter,   inches 3%  4%  5%  7%             9 

Each    $0.30  .35  .40  .45           .50 

fi!02.  FUNNEL,  Agateware,  for  pouring  chemical  salts  into  jars  and  wide  mouth  bottles.  Size,  5 
inches  by  4%  inches 25 

FUNNELS,  Alundum  Conical  Filters,  see  Filtering  Cones,  Alundum. 

6106.  FUNNEL,  Creosote,  with  stem  graduated  to  12  cc  in  i/i0  cc  divisions,  for  estimating  moisture 
in  creosoted  wood.  (See  Bulletin  134  of  the  Forest  Service,  United  States  Department  of 
Agriculture)  2.00 

(5112.    FUNNELS,  Glass,  Bunsen,  with  angle  of  60°,  with  ground  rim  and  long  slender  stems  ground  to  a 
point.     Length  of  stem,  about  150  mm. 

Diameter,  mm. .     25      40      50      65      75     90      100      125      150      175      200      225      250      300 
Each  . .  .18     .24     .25     .26     .34    .36       .38       .60       .65       .95      1.10     1.25     1.70     2.25 


6114. 

6116. 
6118. 

(T120. 


FUNNELS,  Glass,  Bunsen,  same  as  No.  6112,  with  constriction  in  stem  just  below  funnel  to  in- 
crease rapidity  of  filtration. 


Diameter,  mm 50 

Each..  30 


65 
.35 


75 
.45 


90 
.50 


C126. 


FUNNELS,  Glass,  nest  of  3;  one  each  %,  1  and  !'/&  inches  in  diameter per  nest 

FUNNELS,  Glass,  without  stem,  for  use  in  sugar  analysis. 

Diameter,  mm 75 

Each 70  .75 

FUNNELS,  Glass,  with  bulb  in  stem,  for  use  in  filtering  through  glass  wool  or  cotton. 

Diameter,  inches 4% 

Capacity,  ounces 8 

Each 85 

FUNNELS,  Glass  Filter,  so-called  Carbon  Filters,  for  use  with  Gooch  crucibles. 

No A               B  C 

Diameter  at  top  inside,  mm 25              30  35 

For  Gooeh  crucible,  No 2                3  4 

Each 25            .30  .35 

FUNNELS,  Glass,  Bibbed,  for  rapid  filtering,  of  heavy  molded  glass  with  smooth  rim. 

Diameter,  inches 3%  4%          '  5%  7%  8% 

Capacity,  ounces 4  8  16  32          gals.  %  1 

Each 20  .25  .35  .50  .75          LIO 

FUNNELS,  Filter  Backs,  see  Filter  Backs. 


100 
.60 

.60 


100 
.80 

5% 

16 

1.05 

D 

40 

.46 

13 

2 

2.00 


258 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  6130. 


Nos.  6132-4. 


No.  6136. 


No.  6144.  No.  6146. 


No.  6152. 


No.  6158.        No.  6160.      No.  6162.      No.  6164. 


No.  6166. 


6130. 
6132. 

6134. 
6136. 
6138. 

6144. 


6.50 


H 
300 
120 
14.00 


FUNNEL,  Hot  Water,  of  heavy  copper,  single  wall,  with  coil  for  heating  with  steam  or  hot  water 

from  a  distance,  when  filtering  inflammable  liquids.     Diameter  inside,  5M>  inches $5.00 

FUNNEL,  Hot  Water,  Koch's,  of  heavy  polished  copper,  double  walled,  with  detachable  iron  legs. 

Diameter  inside,  5%  inches 7-00 

FUNNEL,  Hot  Water,  Koch's,  similar  to  No.  6132,  but  with  single  wall  only 4.50 

FUNNEL,  Hot  Water,  Plantamour's,  of  tin,  double  walled.     Diameter  inside,  5V£  inches. .  4.25 
FUNNEL,  Hot  Water,  same  as  No.  6136,  but  made  of  heavy  polished  copper  throughout. 
FUNNELS,  Porcelain,  Conical,  perforated,  see  Filter  Cones,  Porcelain. 
FUNNELS,  Porcelain,  Buechner's,  glazed,  with  straight  sides  and  fixed  perforated  plate. 

No A  B  C  D  E  F  G 

Diameter  outside,  mm 50          60  80  100          150          200          250 

Height  of  walls,  mm 20          25  30  40  60  90  100 

Each 75        1.00         1.50         1.95         3.60         5.50         8.50 

6146      FUNNELS,  Porcelain,  Hirsch's,  glazed,  with  conical  sides  and  fixed  perforated  plate.  With  handle. 

No A                B  C 

Diameter,  mm 86              120  175 

Each 90            1.50  2.90 

6152.     FUNNELS,  Hard  Rubber,  polished,  with  corrugated  spout  to  allow  escape  of  air. 

No . A               B               C  D 

Diameter,  inches 3*4            4%            5%  6% 

Capacity,  ounces 4                                16  24 

Each.... 45            .60            .80  1.10 

6158.     FUNNEL,  Separatory,  Carnot's,  for  ether  separations  in  nickel  determinations  in  iron  and  steel 
analysis.     Capacity  of  body,  200  cc;  capacity  of  bulb,  100  cc,  with  mark  at  30  cc.     (See  Blair's 

Chemical  Analysis  of  Iron,  page  178) 5.00 

6160.    FUNNELS,  Separatory,  cylindrical,  open  top,  with  glass  stop-cock  and  long  stem. 

No.                     A                 B                C  D 

Capacity,  cc 30                60               125  250 

Each.. 1.25             1.45             1.90  2.20 

6162.     FUNNELS,  Separatory,  cylindrical,  same  as  No.  6160,  but  with  ground  in  glass  stopper. 

Capacitv,    cc 60               125  250 

Each..'.! 1-50            1.90  2.50 

6164.     FUNNELS,  Separatory,  cylindrical,  same  as  No.  6162,  but  graduated  in  cc. 

Capacitv,    cc 125  250 

Each 3.00  5.00 

6166.     FUNNELS,  Separatory,  funnel  shape,  60°  angle  ,of  heavy  glass,  with  glass  stop-cock. 

Diameter,  mm 100              150  200 

Each..                     2.80            4.50  5.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


259 


No.  6168.    No.  6170.    No.  6172.    No.  6174.   No.  6176. 


No.  6178. 


O 


1 


No.  6186. 


No.  6192.  No.  6194.  No.  6196.  No.  6198. 


No.  6200. 


6168. 
6170. 

6172. 

6174. 
6176. 

6178. 

6180. 
6186. 
6192. 

6194. 


FUNNELS,  Separatory,  glob*  shape,  light  glass,  with  ground  glass  stopper,  stopcock  and  long 
stem. 

Capacity,  ec 30  60  125  250  500  1000  2000 

Each  . .' $L40  1.50  2.00  235  2.85  3.90  6.50 

FUNNELS,  Separatory,  globe  shape,  of  heavy  molded  glass  with  glass  stopper,  stop-cock  and 
short  stem. 


Capacity,  cc • 500 

Each 5.40 


1000 
7.20 


FUNNELS,  Separatory,  Squibb's,  pear  shape,  with  ground  in  glass  stopper. 

Capacitv,  ce 125 

Each..". 2.30 


2000 
9.00 

250 
3.50 


4000 
15.00 

500 


6196. 
6198. 


6200. 


FUNNEL,  Separatory,  Straus,  for  the  estimation  of  lactic  acid  in  gastric  juice;  with  glass  stop- 
cock.    Capacity  about  30  cc,  with  marks  at  5  cc  and  25  ce 2.00 

FUNNEL,  Separatory,  for  sulphonation  test  of  creosote,  with  neck  graduated  to  5  ce  in  i{0  ce 
divisions.     Capacity,  125  cc.     (See  Circular  112  of  Forest  Service,  United  States  Department 

of  Agriculture) 2.50 

FUNNEL,  Separatory,  Terrapin,  for  immiscible  liquids,  as  used  by  the  Bureau  of  Chemistry, 
United  States  Department  of  Agriculture.    With  ground   glass   stopper  and  glass  stop-cock. 

Capacity,  200   cc 3.00 

FUNNEL,  Separatory,  Walter's,  for  delivering  single  drops.  With  ground  glass  stopper  and  glass 

stop-cock.     Capacity,  60  cc 2.30 

FUNNEL,  Shaking,  for  estimating  phenol  in  creosote.     (See  Bulletin  107  of  Bureau  of  Animal  In- 
dustry, United  States  Department  of  Agriculture) 2.50 

FUNNEL  TUBES,  conical  top,  straight  stem. 

No A  B 

Length,  cm 30  40 

Each 12  .19 

FUNNEL  TUBES,  thistle  top,  straight  stem. 

No A  B 

Length,  cm 30  40 

Each 10  .12 

FUNNEL  TUBE,  thistle  top,  with  bend  in  stem  for  safety  trap.     Length,  300  mm 18 

FUNNEL  TUBES,  thistle  top  with  bend  and  bulbs.     Length,  300  mm. 

>~o A  B 

Number  of  bulbs 1 1  2 

Each 20  .30 

FUNNEL  TUBE,  heavy,  short  stemmed,  with  bend  and  two  bulbs,  for  use  with  gas  generators. 

40 

FUNNEL  SUPPORTS,  see  Supports. 


260  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


No.  6210.  No.  6218. 

FURNACES,  ALL  KINDS 

FURNACES,  COMBUSTION,  ELECTRICALLY  HEATED 

FURNACES,  Combustion,  Hoskins  Electric,  Type  FD,  for  temperatures  up  to  1000°  C.  The  heat- 
ing element  is  of  Chromel  wire,  wound  in  spiral  grooves  upon  a  special  refractory  tube  I%xl2 
inches  inside,  and  is  surrounded  by  special  packing  material  of  high  heat-insulating  qualities. 
The  element  can  be  easily  renewed  by  the  user  when  burned  out.  Resistance  wire  is  furnished 
in  the  proper  length  in  spiral  coils  ready  to  be  wound  in  the  grooves  upon  the  refractory  tube. 
The  entire  renewal  requires  but  a  few  minutes  time  and  can  be  made  if  necessary  while  the 
tube  is  hot.  A  rheostat  should  be  used  to  control  the  temperature.  The  furnace  operates  on 
either  A.  C.  or  D.  C.  with  a  maximum  consumption  of  550  watts.  Widely  used  for  determining 
carbon  in  iron  and  steel  by  tin  combustion  method  of  Vanier,  Johnson  and  others.  With  con- 
necting cord  and  plug. 

No A  B 

For  volts HO  220 

6210.  Furnace  only $25.00  25.00 

6211.  Furnace  with  rheostat 33.50  33.50 

6212.  RHEOSTATS  for  use  with  No.  6210  to  control  temperatures  within  safe  working  limits. 

No.  . A  B 

For  volts 110  220 

Total  resistance,  ohms 10  40 

Each 8.50  8.50 

Repair  Parts  for  Furnace  No.  6210. 

6213.  REFRACTORY  TUBE  only,  without  wire 3.00 

6214.  CHROMEL  WIRE  for  rewinding. 

No A  B 

For  volts 110  220 

Each 3.50  3.50 

FURNACES,  Combustion,  Hoskins  Electric,  Type  FB,  for  temperatures  up  to  1100°C.,  for  con- 
tinuous operation.  The  heating  element  is  a  spiral  of  heavy  Chromel  wire,  which  radiates  heat 
directly  upon  the  combustion  tube,  enabling  the  furnace  to  be  brought  from  cold  to  1100°C.  in 
only  30  minutes.  As  these  furnaces  operate  on  low  voltages,  they  are  best  adapted  for  use  on 
alternating  currents  in  connection  with  a  transformer.  The  temperature  should  be  controlled  by 
means  of  a  rheostat.  The  element  can  be  readily  removed  and  replaced  by  the  user  in  a  few 
minutes  in  case  of  a  burn  out.  Maximum  power  consumption,  1000  watts.  Length  of  furnace, 
12  inches;  inside  diameter  of  tube,  1%  inches.  Complete  with  connecting  cord. 

No A  B 

For  volts 110  220 

6218.  Furnace  only 25.00  25.00 

6219.  Furnace  with  rheostat  and  transformer  for  60  cycles 62.00  62.00 

6220.  RHEOSTATS  for  use  with  No.  6218. 

No A  B 

For  volts 110  220 

Each 11.00  11.00 

6221.  HEATING  ELEMENTS  for  No.  6218. 

No A  B 

For  volts 110  220 

Each i 5.00  5.00 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


261 


G226. 
6227. 
6228. 
6229. 
6230. 
6232. 


6234. 
6235. 
6236. 
8237. 

6238. 
6232. 

(1246. 


No.  6246. 


No.  6234. 


FURNACE,  Combustion,  Multiple  Unit  Electric,  with  tube  I1/4xl2  inches.  The  heating  element  is 
made  up  of  two  units  with  spiral  coils  in  longitudinal  grooves,  either  of  which  may  be  easily  re- 
placed by  the  user  when  burned  out.  Widely  used  for  carbon  determinations  in  iron  and  steel, 
heat  treatment  of  small  rods  or  tubes,  and  for  Pyrometer  calibration.  Can  be  used  inter- 
changeably on  110  or  220  volts  A.  C.  or  D.  C.,  by  means  of  a  selective  plug  supplied  with 
furnace.  Maximum  power  consumption,  560  watts.  Complete  with  six  feet  of  flexible  cord 
and  connecting  plug.  Height  over  all,  10  inches;  shipping  weight,  25  pounds. 

Furnace  only $25.00 

Furnace  with  rheostat  (voltage  must  be  specified) 33.50 

HEATING  UNITS  for  No.  6226,  wound  ready  for  use each     3.75 

REFRACTORY  only  of  No.  6228 per  unit     1.75 

COILED  WIRE  only  of  No.  6228,  for  rewinding per  unit     2.00 

ALUNDUM  TUBE  for  use  with  No.  6226  in  calibrating  Pyrometers,  12x1  inch  inside  diameter  2.00 
FURNACE,  Combustion,  Multiple  Unit  Electric,  Hinged  Design,  permitting  inspection  of  combus- 
tion tube  at  any  time  without  removing  the  same  or  disconnecting  the  train.  Operates  inter- 
changeably on  110  or  220  volts  A.  C.  or  D.  C.  Maximum  power  consumption,  750  watts.  Ship- 
ping weight,  33  pounds.  Height  of  furnace  to  center,  9*£  inches;  length,  12  inches;  inside 
diameter  of  tube,  I1/!  inches. 

Furnace  only 37.50 

Furnace  with  rheostat  (voltage  must  be  specified)    47.50 

HEATING  UNITS  for  No.  6234,  wound  ready  for  use each    5.00 

REFRACTORY  only  of  No.  6236 per  unit    2.00 

COILED  WIRE  only  of  No.  6236,  for  rewinding per  unit     3.00 

ALUNDUM  TUBE  for  use  with  No.  6234  in  calibrating  Pyrometers,  12x1  inch  inside  diameter  2.00 
FURNACES,  Organic  Combustion,  Multiple  Unit  Electric,  consisting  of  three  sections,  each  of 
which  can  be  moved  along  the  rails  for  use  at  different  points  and  is  operated  independently 
by  means  of  its  switch  and  rheostat  on  the  base.  The  upper  half  of  each  section  can  be  raised 
independently  for  inspection  without  disconnecting  the  current.  The  heating  units  are  in  two 
sections,  either  of  which  may  be  easily  and  quickly  replaced  by  the  operator  in  case  of  a  burn 
out.  The  temperature  of  1000°C.  can  be  reached  in  40  minutes  and  held  constant  indefinitely  by 
means  of  the  rheostat.  Rapid  cooling  is  obtained  by  raising  the  upper  section.  The  life  of  the 
heating  elements  is  about  1000  hours  at  temperatures  not  exceeding  1100°C.  The  trough  for 
supporting  the  combustion  tube  is  of  pure  nickel  supported  at  the  ends  and  is  free  from  eon- 
tact  with  the  furnace.  Lengths  of  the  three  sections  4,  8  and  12  inches  respectively;  inside 
diameter  of  tube  space,  1%  inches;  lateral  adjustment  of  each  furnace,  ll1/^  inches;  distance 
from  bench  to  center  of  furnace,  9  inches;  length  of  combustion  tube  required,  48  inches;  total 
length  of  base,  42  inches;  width  of  base,  9%  inches;  height  of  furnace  over  all  closed,  12^4 
inches;  height  over  all  open,  17y>  inches;  shipping  weight,  135  pounds. 

No A  B 

For  volts 110  220 

Each  ...  125.00  125.00 


262 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6258. 


No.  6262. 


6247. 
6248. 


6249. 
6250. 


6251. 
6252. 


6253. 
6254. 


NICKEL  THOUGH  only  of  No.  6246,  to  support  combustion  tube,  39y2  inches  long 

COMBUSTION  TUBE,  Pyrex,  for  use  with  No.  G246.     Length,  48  inches;  diameter  inside, 

HEATING  UNITS  for  No.  6246  (two  required  for  each  section). 

No A  B 

For  section small  medium 

For  110  volts,  each 3.75  4  50 

For  220  volts,  each 3.75  5.00 

REFRACTORIES  only  of  Nos.  6249  and  6250  (two  required  for  each  section). 

No A  B 

For  section • small  medium 

For  110  volts,  each 1.50  1.75 

For  220  volts,  each 1.50  1.75 

COILED  WIRE  for  use  with  Nos.  6251  and  6252,  for  rewinding,  sufficient  for  one  unit. 

No A  B 

For  section i small  medium 

For  110  volts,  each 2.25  2.75 

For  220  volts,  each 2.25  3.25 


$1.50 

1  inch 
2.65 

C 

large 
5.00 
5.50 

C 

large 
2.00 
2.00 

C 

large 
3.00 
3.50 


FURNACES,  COMBUSTION,  GAS  HEATED 

6258.  FURNACES,  Combustion,  Fletcher's,  for  use  with  coal,  gasoline  or  natural  gas.     Can  be  used 

with  or  without  blast.  Length  of  flame  is  adjustable  at  any  part  of  furnace.  Widely  used  for 
determining  carbon  in  iron  and  steel.  For  blast  purposes,  use  No.  1374  Foot  Blower. 

Length,  inches 12  18  24 

Each    15.00  19.00  22.00 

6259.  FIRE-CLAY  CASING  BLOCKS  for  Furnace  No.  6258,  6  inches  in  length each     1.00 

6262.    FURNACES,  Combustion,  Glaser's,  improved  form.     Provided  with  mica  plates  for  watching 

the  flame  during  combustion.  The  row  of  burners  is  movable  in  a  furrow;  the  burners  are  pro- 
vided with  stop-cocks  with  separate  long-handled  key  for  turning  and  with  nickel-plated  air 
regulators.  Complete  with  top  plates  of  clay. 

No A                   B  C                   I) 

Length,  inches 14%                23  30                  37 

Number  of  burners 10                  16  21                  26 

Each 37.50             50.00  60.00             75.00 

6264.  FURNACES,  Combustion,   Glaser's.  same  as  No.  6262,  but  for  gasoline  gas. 

No A                   B  C 

Number  of  burners 10                  16  21 

Each 45.00             60.00  70.00 

6265.  EXTRA  TOP  CLAYS  for  Nos.  6262  and  6264 each  .60 

per  dozen    6.00 

6266.  EXTRA  SIDE  CLAYS  for  Nos.  6262  and  6264 each  .25 

per  dozen    2.50 

6267.  EXTRA  GUTTERS  for  Nos.  6262  and  6264 each  .15 

per  dozen    1.50 

6268.  EXTRA  STOP-COCK  KEY  for  Nos.  6262  and  6264 1.00 

FURNACE,  Simple  Combustion,  see  No.  2066. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


263 


6278. 
6279. 


6280. 


6281. 
6282. 


6288. 

6289. 
6290. 
6291. 
6292. 


No.  6278. 


No.  6290. 


No.  6288. 


FURNACES,  CRUCIBLE,  ELECTRICALLY  HEATED 

FURNACES,  Combined  Crucible  and  Muffle,  Hoskins  Electric,  Type  FD,  with  crucible  chamber 
2  inches  in  diameter  by  2%  inches  deep.  Can  be  heated  from  room  temperature  to  1000°C.  in 
30  minutes.  Temperature  should  be  controlled  by  means  of  a  rheostat.  Requires  no  special 
'wiring  as  furnace  may  be  connected  directly  to  lamp  socket.  Maximum  power  consumption, 
370  watts.  The  heating  unit  is  easily  rewound  by  user  in  case  of  burn  out,  as  the  refractory  is 
spirally  grooved,  and  the  resistance  wire  is  furnished  in  a  spiral  coil  ready  to  wind  in  the 
grooves.  The  entire  renewal  requires  but  a  few  minutes.  Complete  with  connecting  cord  and 
plug.  Shipping  weight,  22  pounds. 

Xo A  B 

For  volts 110  220 

Furnace  only $20.00  20.00 

Furnace  with  rheostat 28.50  28.50 

Not*:— Larger  furnaces  of  the  same  type  as  Xo.  6278  can  be  supplied  on  short  notice,  but  are  not 

carried  in  stock.     Send  for  special  bulletin  on  Electric  Furnaces. 

RHEOSTATS,  for  use  with  Xo.  6278  where  it  is  desired  to  hold  the  temperature  stationary  at 
some  point,  or  to  control  the  variation  in  temperature,  as  h'  annealing. 

No A  B 

Voltage 110  220 

Resistance,  ohms 26.2  105 

Each 8.50  8.50 

REFRACTORY  only  for  Xo.  6278,  without  wire 1.00 

CHROMEL  WIRE  only  for  Xo.  6278,  for  rewinding. 

Xo " A  B 

For  volts 110  220 

Each 1.50  1.50 

Note: — The  use  of  a  Pyrometer  with  Xo.  6278  is  desirable,  as  it  will  enable  the  operator  to  know 

at  all  times  the  exact  temperature  within  the  furnace  chamber. 
ELECTRIC  PYROMETERS,  see  Pyrometers. 

FURNACES,  Crucible,  Multiple  Unit  Electric,  for  temperatures  up  to  1000°C.,  for  continuous 
duty.  Adapted  for  melting  metals,  for  determining  the  decalescent  point  of  steel,  and  for 
calibrating  pyrometers.  Can  be  brought  from  cold  to  1000°C.  in  30  minutes.  The  heating  ele- 
ment is  in  two  units,  either  of  which  may  be  quickly  replaced  by  the  operator  if  burned  out. 
Furnaces  Xos.  82,  84  and  86  operate  interchangeably  on  110  and  220  volts.  Xo.  80  is  made  for 
either  voltage,  but  must  be  used  with  rheostat  when  ordered  for  220  volts. 

Xo 80  80  82  84  86 

For  volts 110         220         110  &  220       110  &  220       110  &  220 

Diameter  inside,  inches 2%        2y8  2%  3  3 

Depth  inside,  inches 2%         2%  4  3%  5 

Diameter  over  all,  inches 7%         7%  7%  8%  8% 

Height  over  all,  inches 8%         8^4  10  11  12% 

Rating  of  current  for  110  volts,  amperes.       3.55         . . .  4.4  5.0  6.6 

Rating  of  current  for  220  volts,  amperes.       ...         3.55  2.2  2.5  3.3 

Maximum  power  consumption,  watts....       390         780  484  550  725 

Kilowatt    hours    consumed    in    reaching 

HOOT.  (760°C.)  from  75°F 095        .325  .20  23  .3 

Kilowatt     hours     consumed    in    holding 

UOO°F.  (760°C.) 20          .40  .25  .325  .37 

Shipping  weight  of  furnace,  Ibs 16  16  22  25  30 

Shipping  weight  with  rheostat,  Ibs 20  30  26  29  34 

Furnace  only  20.00      25.00  30.00  37.50 

Furnace  with  rheostat 28.50      30.00  33.50  38.50  49.50 

Heating  units  wound  ready  for  use,  each       2.75       2.75  3.50  3.75  4.75 

Refractory  only 1.00        1.00  1.50  1.75  2.00 

Coiled  wire  only  for  rewinding 1.50       1.50  2.00  2.00  2.75 


264 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6309. 


No.  6310. 


6300. 
6304. 

6305. 
6308. 

6309. 
6310. 


6311. 
6312. 
6313. 
6314. 
6315. 
6316. 
6317. 
6318. 


FURNACES,  CRUCIBLE,  FOR  GAS  AND  LIQUID  FUELS 

FURNACE,  Crucible,  Braun's  Improved  No.  8,  for  gasoline  or  gas.  Can  be  operated  with  1% 
inch  Gary  Gasoline  Burner  No.  2214A  with  a  consumption  of  less  than  %  gallon  of  gasoline  per 
hour  or  with  Braun  Blast  Burner  No.  2150,  with  a  consumption  of  about  150  cubic  feet  per  hour. 
A  removable  shelf  is  provided  for  holding  hot  crucibles  or  covers.  Capacity  of  furnace,  6  size 

F  crucibles;  shipping  weight,  108  pounds $23.00 

FURNACE,  Crucible,  Case  Melting  No.  3,  for  use  with  gasoline  or  oil.  The  flame  blow-in  is 
located  so  that  the  flame  blows  in  on  a  tangent  and  does  not  hit  the  crucible  until  there  is  a 
complete  combustion.  The  hot  gases  circle  around  the  crucible,  thereby  preventing  loss  by 
cracking.  Made  in  three  sections;  will  take  No.  7  plumbago  crucible.  Shipping  weight,  50 

pounds.    Without  burner 7.50 

BURNER,  Hydro-Carbon,  for  use  with  No.  6304,  for  gasoline 6.50 

GASOLINE  TANK  OUTFIT  for  No.  6304,  see  No.  2215. 

FURNACE,  Crucible,  Fletcher's  No.  40,  consisting  of  a  crucible  pot  with  lid  and  blowpipe 
mounted  on  cast  iron  base.  Operates  on  %  inch  supply  of  illuminating  gas,  using  a  9A  or  10A 
Foot  Blower  No.  1374  or  1376.  Gas  consumption,  about  10  cubic  feet  per  hour.  Diameter  of 
crucible  pot,  4%  inches;  height  of  crucible  pot,  5%  inches;  height  of  furnace  over  all,  6% 
inches;  inside  dimensions  of  crucible  space:  diameter,  2%  inches;  depth,  2l/2  inches;  capacity 
of  crucible,  10  ounces  gold.  Complete  with  one  No.  00  clay  crucible,  but  without  blower  4.00 
FURNACE,  Crucible,  Fletcher's  No.  40A,  same  as  No.  6308,  but  with  injector  burner.  Can  be 
used  with  either  coal,  gasoline,  or  natural  gas,  requiring  %  inch  supply  pipe  and  consuming  24 
cubic  feet  per  hour.  Requires  No.  9A  or  10A  Foot  Blower  to  furnish  blast.  Complete  with 

No.  00  clay  crucible,  but  without  blower 4.50 

FURNACE,  Crucible,  Fletcher's  No.  40B,  same  as  No.  6308,  but  for  kerosene.     Requires  a  9A  or 

10A  Foot  Blower.     Complete  with  No.  00  crucible,  without  foot  blower 6.50 

Extra  Parts  for  Furnaces  Nos.  6308,  6309  and  6310. 

EXTRA  FURNACE  BODY 1.25 

EXTRA  FURNACE  COVER 60 

BURNER  only  of  No.  6308 1.75 

BURNER  only  of  No.  6309 2.25 

BURNER  only  of  No.  6310 4.50 

STAND  only  for  Nos.  6308,  6309  and  6310,  without  burner  or  furnace  body 1.00 

PLUMBAGO  CRUCIBLES,  No.  00 each      .65 

CLAY  CRUCIBLES,  No.  00 each      .08 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  S.  A. 


265 


No.  6326. 


No.  6332. 


No.  6328. 


6323. 
6326. 

6328. 


fir,  20. 
6332. 


41A 

3 

4% 
5% 

9B 
8.50 

3 
.85 


6333 
6334. 


FURNACES,  Crucible,  Fletcher's  Perfected  Injector.  Can  be  used  on  coal,  gasoline  or  natural 
gas.  Burner  is  in  one  easting,  preventing  nozzle  from  becoming  overheated.  Complete  with 
one  crucible,  but  without  foot  blower. 

No 41 

For  crucible,  No 

Diameter  of  crucible  space  inside,  inches 3% 

Height  of  crucible  space,  inches 3% 

Foot  blower  required  to  furnish  blast,  No 9A 

Each $6.00 

EXTRA  CRUCIBLES  for  No.  6322. 

No 1 

Each 70 

FURNACE,  Crucible,  Fletcher's  Perfected  Injector  No.  41E,  same  as  No.  6322,  but  with  double  in- 
jector burner  for  kerosene.  Requires  No.  9B  Foot  Blower  to  furnish  blast.  Dimensions  same 
as  No.  6322,  size  41.  Complete  with  No.  1  elay  crucible  and  double  burner,  but  without  foot 

blower 11-50 

FURNACE,  Fletcher's  Crucible  and  Muffle  Combined,  for  use  with  coal,  gasoline  or  natural  gas, 
from  1$  or  preferably  %  inch  supply.  Requires  No.  9B  Foot  Blower  to  produce  blast.  Will  take 
No.  3  crucible  or  No.  6  when  cover  is  reversed,  or  a  muffle  3%x2%x6H  inches.  Height  of  fur- 
nace, 11  inches;  outside  diameter,  9Jo  inches:  diameter  of  crucible  space,  6  inches;  height  of 
irueible  space,  6%  inches;  maximum  gas  consumption,  100  cubic  feet  per  hour.  Complete  with 

injector  burner,  No.  3  clay  crucible,  and  muffle 14.00 

EXTRA  PLUMBAGO  MUFFLES  for  No.  6328 each     3.00 

FURNACE,  Crucible.  Fletchers  Draft  No.  15,  for  crucibles  up  to  4x3*£  inches;  for  use  without 
blast.  The  adjustable  burner  is  of  special  form  furnishing  a  number  of  concentric  names,  and 
will  operate  upon  coal,  gasoline  or  natural  gas.  With  gas  consumption  of  50  cubic  feet  per  hour, 
using  %  inch  supply,  it  will  rapidly  melt  a  crucible  of  gold  or  silver.  Height  of  furnace  from 
table  to  top  of  lid,  18  inches;  diameter  of  crucible  pot,  IV,  inches;  height  of  cmcible  pot,  10 
inches;  diameter  of  flame  space  in  furnace,  6*4  inches;  height  of  flame  space,  5V.  inches.  Com- 
plete with  Xo.  3  clay  crucible,  clay  cylinder  and  tongs,  and  6  feet  of  pipe 19.00 

Extra  Clay  Crucibles  for  No.  6332,  size  No.  3 each      .20 

Extra  day  Cylinders  for  No.  6332 each     .50 


266 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


No.  6342. 


No.  6350. 


6342. 
6343. 
6344. 
6345. 


6346. 


6350. 
6351. 
6352. 
6353. 
6354. 

6355. 


FURNACES,  MUFFLE,  ELECTRICALLY  HEATED 

FURNACES,  Muffle,  Hoskins  Electric,  Type  FD,  with  heating  element  of  Chromel  wire  wound  in 
spiral  grooves  on  a  special  refractory  muffle,  surrounded  by  packing  material  with  high  heating 
insulating  qualities.  Heating  elements  can  be  easily  rewound  by  user  in  case  of  burn-out,  as 
the  wire  is  furnished  in  spiral  coils  of  the  proper  length  ready  to  wind  in  the  grooves  of  the 
muffle.  The  entire  renewal  requires  but  a  few  minutes.  A  rheostat  should  be  used  to  keep  the 
temperature  constant  at  the  desired  point.  This  furnace  is  useful  for  ash  determinations,  igni- 
tion of  precipitates,  incinerations,  fusions,  combustions,  enameling,  hardening  and  annealing 
small  pieces  of  steel,  melting  alloys  and  metals,  etc.  With  connecting  cord  and  plug,  but  with- 
out rheostat.  , 


No 


201 


202 
4^4x3x8 

1300 
60.00 
71.00 

9.00 

8.00 


203 


204 


2100 
80.00 
95.00 
12.50 
13.00 


3400 

110.00 

135.00 

18.50 

19.00 


Inside  dimensions  of  muffle  space,  inches. 

Maximum  consumption,  watts 850 

Furnace  only $45.00 

Furnace  and  rheostat — 53.00 

Muffle  only  without  wire 6.00 

Chromel  wire  for  rewinding 5.00 

In  ordering,  kindly  specify  voltage. 

RHEOSTATS  for  No.  6342,  for  controlling  temperature. 

For  furnace,  No 201  202  203 

Each    10.00  13.00  17.00 

In  ordering,  kindly  specify  voltage. 

FURNACES,  Muffle,  Hoskins  Electric,  Type  FB,  for  temperatures  up  to  1100°C.  These  furnaces 
are  designed  for  heavy  continuous  duty,  and  arc  intended  to  operate  on  low  voltages.  They  are 
therefore  best  adapted  to  operate  on  alternating  current  in  connection  with  a  transformer. 
Temperature  control  is  secured  by  means  of  a  rheostat  in  the  case  of  No.  202  Furnace  and  by 
means  of  a  regulating  transformer  in  the  case  of  No.  204.  These  furnaces  are  made  for  110,  220 
and  440  volts  on  either  60  or  25  cycles.  Prices  will  be  quoted  upon  request  in  the  case  of  other 
voltages  or  frequencies. 


204 
27.00 


No 202 

Inside  dimensions  of  muffle  space,  inches 4%x3x9 

2750 

90 

90.00 

167.50 

. . 187.50 

142.50 

162.50 


Maximum  power  consumed,  watts. 

Time  required  to  raise  temperature  to  1100°C.,  minutes. 

Furnace  only 

Furnace  with  rheostat  and  transformer,  60  cycles 

Furnace  with  rheostat  and  transformer,  25  cycles 

Furnace  with  regulating  transformer,  60  cycles 

Furnace  with  regulating  transformer,  25  cycles 


EXTRA  HEATING  ELEMENTS,  Hair  Pin  Type. 

For  furnace,  No 

Number  of  elements  required 

Each  .. 


202 

10 

1.25 


204 

7%x5xl2V2 
6000 

90 

125.00 
282.50 
322.50 
282.50 
322.50 

204 

10 

3.00 


In  ordering,  kindly  specify  voltage. 

Note: — Furnaces  of  type  FB  with  larger  muffle  space  than  those  listed  can  be  furnished  on  short 
notice,  but  are  not  carried  regularly  in  stock.     Prices  quoted  upon  application. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


267 


No.  6362. 


No.  6372. 


FURNACES,  Muffle,  Multiple  Unit  Electric,  for  temperatures  up  to  955°C.,  for  ignition  of  pre- 
cipitates, ash  determinations,  fusions,  heat  treatment  of  steel,  melting  of  alloys  and  metals,  en- 
ameling, etc.  These  furnaces  are  of  the  multiple  unit  type,  the  heating  element  being  made  in 
four  sections  forming  the  sides  of  the  muffle  chamber.  Either  of  these  sections  may  be  replaced 
independently  of  the  others  in  case  of  a  burn-out,  and  all  may  be  reversed,  if  desired  to  change 
from  open  groove  to  closed  face,  the  change  increasing  the  time  of  heating  only  3  per  cent,  on 
account  of  the  high  conductivity  of  the  material.  The  superior  heat  insulation  of  the  Multiple 
Unit  Furnaces  permits  a  larger  muffle  space  for  the  same  power  consumption.  These  furnaces 
can  be  operated  interchangeably  on  110  and  220  volts  by  means  of  a  selective  plug  furnished 
with  the  equipment.  The  counter-weighted  doors  are  reversible  for  hinging  at  either  top  or 
bottom  of  opening,  and  are  provided  with  %  inch  air  tight  mica  peephole.  A  %  inch 
pyrometer  opening  is  provided  in  rear  head.  A  rear  door  of  the  plug  type  with  vent  hole  and 
handle  can  be  supplied  if  desired,  at  additional  charge.  Complete  with  six  feet  of  flexible  leads 
and  connector  plug,  and  with  metal  shelf  for  holding  crucibles,  tongs,  etc. 

No 50  52                                 54 

Inside  dimensions  of  muffle  space,  inches.  3*4x2%x7  4%x3xlO                   5%x3%xl2 

Outside  dimensions  of  furnace,  inches. ..  12>4xlO»4xl4            15x12^4x16                 17xl3%xl8 

Shipping  weight,  furnace  only,  Ibs 65  100                               135 

Shipping  weight  with  rheostat,  Ibs 72  107                               148 

Eating  of  current  for  110  volts,  amperes.  9.1  13.1  18.8 

Bating  of  current  for  220  volts,  amperes.  4.55  6.55                              9.4 

Maximum  power  consumption,  watts ....  1000  1440  2070 
Kilo  watt  hours   consumed  in  reaching 

1400°F.  (760°C.)  from  75°C .5  .72  1.2 

Kilo    watt    hours    consumed   in   holding 

1400°F.  (760°C.) .39  .89  1.37 

6362.  Furnace  only $45.00  60.00  80.00 

6363.  Furnace  with,  rheostat. 55.00  72.00  96.00 

6364.  Extra  units  for  top  or  bottom,  each 3.25  5.25                            7.50 

6365.  Extra  units  for  side,  each 2.50  3.50                            5.50 

6366.  Refractory  only  for  top  or  bottom,  each. .  1.75  2.75                            3.50 

6367.  Refractory  only  for  side,  each 1.25  1.75                            2.75 

6368.  Coiled  wire  only  for  re-winding  top  or 

bottom,  each 1.50  2,50  4.00 

6369.  Coiled,  wire  only  for  rewinding  side,  each.  1.25  1.75  2.75 

6370.  Rear  doors,  extra 5.00  5.50  6.00 

Note: — Always  specify  voltage  when  order  includes  rheostat 

6372.  FURNACES,  Muffle,  Multiple  Unit  Electric,  same  as  No.  6363,  but  with  rheostat  encased  in  hous- 
ing below  furnace  body,  convenient  for  nse.  This  position  also  eliminates  unsightly  and  dan- 
gerous wiring.  Complete  with  six  feet  of  flexible  leads  and  connecting  plug. 

No 60  62  64 

Inside  dimensions  of  muffle  space,  inches.    3Vix2%x7  4^4x3x10  5*4x3%xl2 

'Outside  dimensions  of  furnace,  inches...    ISxlO^xlS  14%xl2%xl6%  16M>xl3%xl9 

Shipping  weight,  Ibs 70  105  135 

Each    63.50  82.00  107.50 

In  ordering,  kindly  state  voltage. 

For  EXTRA  UNITS  AND  PARTS  for  No.  6372,  see  Nos.  6364-6370. 


268 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6386. 


No.  6390.     (Shown  with  complete  outfit 
for  use  with  gasoline.) 


FURNACES,  MUFFLE,  GAS  HEATED 


6386. 


FURNACES,  Muffle,  for  all  work  where  exact  temperatures  are  desired  not  exceeding  the  fusing 
point  of  copper.  May  be  operated  with  coal  gas,  natural  gas,  or  gasoline  gas  without  altera- 
tion. Complete  with  muffle,  dome,  crucible  tongs  and  6  feet  of  chimney  pipe  and  burner. 

No 3  4                       5                         6 

Inside  muffle  space,  inches 3x4x2%  3%x5%x3 

Gas  pipe  and  tap  required,  inches Ya  % 

Height  from  table  to  top  of  lid,  inches.  .  16  19J/2 

Dimensions  of  clay  parts,  inches 7%x7%x8  10x9x11 

Maximum  gas  consumption,  cubic  feet.  .  72  96 

Net  weight,  pounds 60  88 

Each $20.00  26.00 


4%x6%x4 

1  1 

23  27% 

Il%xl0%xl4  14x15^x17% 

120  225 

145  225 

40.00  50.00 


6387. 


6388. 


6390. 


6394. 


EXTRA  PLUMBAGO  MUFFLES  for  No.  6386. 

For  furnace,  No 3                 4  5 

Each 1.75  2.25  2.75 

EXTRA  DOMES  for  No.  6386. 

For  furnace,  No 3                  4  5 

Each  . .  1.75  2.25  2.75 


6 
3.25 


6 
3.25 


FURNACE,  Muffle,  Braun's  No.  20,  for  operation  with  gas  or  gasoline.  Mounted  on  iron  legs  for 
convenience  in  operation.  Size  of  muffle  space,  6x12x4  inches.  Shipping  weight,  140  pounds. 
Complete  with  one  muffle,  hood,  and  two  lengths  of  stove  pipe,  but  without  burner.  If  gasoline 
is  used,  Gary  Burner  No.  2214A,  1%  inch,  is  recommended;  for  gas,  Vulcan  Non-Blast  Burner 
No.  2146D  should  be  used 23.00 

FURNACE,  Combination  Muffle  and  Crucible,  Braun's  No.  40,  for  gas  or  gasoline.  The  construc- 
tion is  such  that  the  muffle  is  placed  above  the  crucible  compartment  and  the  burner  hole  is  so 
located  as  to  force  the  flame  in  rotary  motion  around  both  sides  of  crucible  compartment.  The 
heat  rising  from  the  crucible  chamber  creates  by  suction  a  draft  through  the  full  length  of  the 
muffle.  The  cover  is  made  in  two  sections  to  facilitate  removal.  The  muffle  draft  for  cupel 
work  is  obtained  through  a  1%  inch  opening  in  jacket  and  lining  at  rear,  and  the  amount  of 
air  admitted  is  controlled  by  a  slide  in  the  jacket.  Dimensions  of  muffle  space,  6x10x4  inches; 
capacity  of  crucible  chamber,  10  size  F  or  6  size  G  crucibles;  shipping  weight,  235  pounds. 
Complete  with  one  muffle,  hood,  two  lengths  of  stove  pipe,  and  covers,  but  without  burner.  Cary 
Burner  No.  2214B,  2  inch,  is  recommended  for  use  with  this  furnace  when  burning  gasoline  or 
Braun  Blast  Burner  No.  2150  for  use  with  gas 36.50 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO.  U.  a  A. 


269 


No.    6398    (shown   with 

complete  outfit  for 

burning  gas). 


No.  2150. 


No.  6410. 


6398.  FURNACE,  Muffle,  Gary's,  No.  33,  for  gas  or  gasoline,  with  patent  draft  inducing  attachment. 
Furnace  is  so  arranged  that  special  combustion  chambers  around  the  muffle  distribute  the  fire 
and  produce  a  uniform  temperature  in  all  portions  of  the  muffle.  Size  of  muffle,  8x12x5*4 
inches;  shipping  weight,  250  pounds.  Complete  with  one  muffle,  muffle  door,  hood  with  special 
draft  attachment,  and  two  lengths  of  stove  pipe,  but  without  burner.  Gary  Burner  No.  2214B, 
2  inch,  is  recommended  for  use  with  this  furnace  when  burning  gasoline,  or  Braun  Blast  Burner 
No.  2150  for  gas $37.00 

2150.  BTJENEE,  Braun 's  Gas,  for  use  with  Furnace  No.  6398,  for  coal  or  natural  gas.  The  construction 
is  such  as  to  secure  a  mixture  of  gas  and  air  which  insures  perfect  combustion.  To  secure 
proper  blast  a  blower  must  be  used.  (See  No.  6400.)  Gas  should  be  secured  from  a  %  inch 
supply  pipe.  Shipping  weight,  18  pounds.  Complete  with  air  and  gas  regulating  valves.  15.50 

6400.  BLOWER  and  Motor  Combination,  for  use  with  No.  2150.  This  outfit  was  especially  designed 
for  use  with  the  Braun  Gas  Burner  and  is  small,  compact  and  self-contained.  The  motor  is  of  a 
greater  power  than  is  actually  required  by  the  blower,  consequently  is  free  from  over-heating. 
Shipping  weight,  110  pounds.  Without  connecting  pipe. 

No.  .  A  B  C  D 

A.  C.  D.  C. 

For  volts 110  220  110  220 

Each 63.00  63.00  63.00  63.00 

2146.  BTJENEES,  Braun 's  Vulcan  Non-Blast,  for  coal  or  natural  gas,  for  use  with  Braun  Furnaces. 
These  are  non-blast  burners  operating  without  noise  and  upon  regular  gas  pressure.  They  are 
so  designed  as  to  secure  a  correct  mixture  of  gas  and  air  to  produce  the  most  intense  heat. 
Temperatures  up  to  2100°F.  have  been  obtained.  Each  tube  consumes  about  50  cubic  feet  of 
gas  per  hour.  Complete  with  regulating  valve  for  each  burner. 

No A  B  C  D 

Number  of  burner  tubes 1  2  3  4 

Each 3.25  7.25          10.50          12.50 

2214.  BTJENEES,  Gary's  Hydro-Carbon,  for  use  with  Braun  Furnaces,  when  using  Tank  Outfit  No. 
2215.  The  flame  is  clean  and  noiseless,  and  gives  off  no  poisonous  or  noxious  fumes.  Easily 
generated,  designed  for  continuous  operation,  and  practically  indestructible.  Threaded  to  fit 
14  inch  standard  pipe. 

No A                  B 

Diameter,  inches 1%                 2 

Consumption  of  gasoline  per  hour  at  35  pounds,  gallons %                  1 

Length  of  burner,  inches 13%  15% 

Shipping  weight,  pounds 5                   7 

Each 13.25  15.75 

For  TANK  OUTFIT  for  use  with  No.  2214,  see  general  heading  Burners,  Gasoline  and  Kerosene. 

6410.  FURNACE,  Muffle,  Wiessnegg  Type,  for  ash  determinations,  incinerations,  etc.  Especially  recom- 

mended for  ashing  in  flour  analysis  where  electric  current  is  not  available.  Complete  with 
four  burners  on  one  base,  equipped  with  wing-tops  to  spread  flame,  and  with  muffle  7x4x3  inches 
inside  20.00 

6411.  EXTEA  MUFFLES  for  No.  6410. .  .  .each     2.00 


270 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  6416. 


6416.  FURNACE,  Tube  or  Bomb,  DeKhotlnsky  Electrically  Heated  and  Regulated,  for  use  in  chemical, 
physical  and  mineralogical  laboratories  where  constant  temperature  is  imperative  during  long 
periods,  and  where  reaction  is  desired  under  pressure  in  a  sealed  tube. 

A  rectangular  copper  container  1  mm  in  thickness  with  an  end  plate  1%  mm  in  thickness  is 
fitted  with  four  tubes  35  mm  inside  diameter  and  54.5  cm  long,  tinned  inside.  The  container  is 
enclosed  in  a  box  of  asbestos-wood  coated  with  white  enamel,  thoroughly  baked  on.  The  space 
(25  mm)  between  box  and  container  is  filled  with  heat  insulating  material  (85  per  cent,  mag- 
nesia and  15  per  cent,  asbestos).  The  furnace  rests  on  a  nickel-plated  stand  with  the  usual 
incline  of  50  mm  per  meter.  Both  ends  of  the  furnace  are  provided  with  four  electric  heating 
units  of  115  watts  each,  three  of  which  may  be  conveniently  added  one  by  one,  by  means  of  the 
switch,  which  constitutes  a  part  of  the  furnace.  The  fourth  unit  is  electrically  connected  to 
our  standard  sensitive  relay,  which  is  automatically  operated  by  a  DeKhotinsky  mercury 
thermo-regulator.  Nickel-plated  hoods,  hinged  at  the  top,  are  provided  at  the  ends  to  prevent 
injury  from  flying  glass  in  case  of  explosions. 

By  means  of  the  thermo-regulator  the  temperature  of  the  furnace  can  be  maintained  with  a  pre- 
cision of  i^o  degree  C.  within  a  temperature  range  from  that  of  the  surrounding  atmosphere  to 
100  degrees  C.,  if  the  container  is  filled  with  water;  or  up  to  160  degrees  C.  if  it  is  filled  with 
Criseo  or  oil.  Outside  dimensions,  55  cm  long  by  24  cm  wide  by  25  cm  high.  Complete  with 
water  gage,  constant  water  level,  6  feet  of  connecting  cord  and  separable  plug  for  attachment 
to  any  lamp  socket. 

No.  .                                                                           A                   B  C                   D 

A.  C.  D.  C. 

For  volts 110                  220  110                  220 

Each $112.50           115.00  110.00            112.50 

Note: — In  ordering  A.  C.  Furnaces,  kindly  state  number  of  cycles. 

6420.  FURNACE,  Tube  or  Bomb,  Carius,  of  iron,  with  openings  for  five  tubes  20  inches  long  up  to  1  '4 
inch  in  diameter 15.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  a  A. 


271 


No.  6424.     (Shown  In  use.) 


No.  6436. 


No.  6424.     (Shown  in  section.) 


6424.  FURNACES,  High-Temp  Electric,  for  temperatures  from  500°  to  1800°C.    This  is  a  low  amperage 

furnace  operating  on  either  A.  C.  or  D.  C.  tip  to  125  volts,  a  feature  which  should  commend  it 
to  users  who  are  not  equipped  with  transformers  or  generators  for  producing  low  voltage  and 
high  amperage  currents.  The  heating  element  is  of  the  granular  resistance  type  entirely  sur- 
rounding the  cylindrical  heating  chamber.  Outside  of  the  heating  element  is  a  concentric 
cylinder  of  refractory  material  surrounded  by  packing  of  heat  insulating  material,  making  a 
compact  furnace  of  a  high  degree  of  efficiency.  All  parts  are  easily  replaceable  at  little  ex- 
pense. With  a  maximum  load  of  40  amperes  and  a  maximum  power  consumption  of  2.75  kilo- 
watts, the  furnace  can  be  brought  to  a  temperature  of  1600°  C.  in  an  hour.  A  switch  board  is 
furnished  with  voltmeter,  ammeter,  circuit  breaker,  line  switch,  and  rheostat  for  controlling 
the  temperature.  Diameter  of  heated  chamber,  2^4  inches;  depth,  3%  inches;  outside  diam- 
eter of  furnace,  14%  inches;  height  over  all,  19  inches.  Dimensions  of  switch-board  panel: 
17  inches  wide,  26  inches  high,  and  1  inch  thick,  requiring  9  inches  of  space  for  mounting.  Com- 
plete with  furnace,  switchboard,  7  feet  of  asbestos  covered  flexible  leads,  5  pounds  of  granular 
resistor  material,  and  instructions  for  use,  but  without  crucible. 

No A  B 

For  volts 110  A.  C.  110  D.  C. 

Each $205.00  195.00 

6425.  GRANULAR  RESISTOR  MATERIAL  for  Xo.  6424 per  5  pounds     1.50 

6426.  SPECIAL  CRUCIBLES  for  No.  6424,  capacity  60  cc each     1.25 

Note: — Price  of  parts  of  No.  6424  for  replacement  furnished  on  request. 

6436.  FUSEL  OIL  APPARATUS,  Bromwell,  with  stop-cock  and  glass  stopper  ground  in,  as  used  by 
the  Association  of  Official  Agricultural  Chemists.  Capacity  of  lower  bulb,  20  cc,  stem  gradu- 
ated from  20  to  22  cc  in  %pth  cc  divisions.  (See  Bulletin  107,  Bureau  of  Chemistry,  United 
States  Department  of  Agriculture) 5.00 


272 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  6466. 


No.  6160. 

GAGES,  ALL  KINDS 

GAGES,  Altitude,  see  Barometers. 

6460.  GAGE,  Differential  (Pitot  Tube),  as  described  by  Prof.  P.  B.  Wood-worth  of  Lewis  Institute, 
Chicago,  at  the  1915  Meeting  of  The  C.  A.  S.  &  M.  T.  Outfit  includes  a  brass  Pitot  tube  of 
correct  shape  and  dimensions,  and  a  glass  manometer  tube  suitably  mounted  on  a  scale  % 
meter  long  graduated  in  both  metric  and  English  systems.  With  this  tube  accurate  measure- 
ments of  the  flow  of  gases  and  liquids  may  be  made.  It  may  also  be  used  as  a  velocity  indi- 
cator on  motor  boats  and  in  open  streams  of  water,  or  in  pipes  conveying  air,  water  or  steam. 
A  set  of  curves  is  furnished  with  the  apparatus  by  means  of  which  pressure  values  may  be 
converted  into  velocities  in  units  of  feet  per  second  or  miles  per  hour  for  either  air  or  water. 

, $12.00 

6464.     GAGES,  Draft,  TJ-TUbe  or  siphon  form,  with    metal   fittings    and   removable   brass    bend    and 
union.     Scale  graduated  in  }{0  inch  divisions. 

Length,  inches   4  6  8  12  18  24 

Each 2.70        3.30        3.60        4.20        4.80        8.40 

6466.     GAGE,  Draft,  pocket  U-fonn,  armored  for  protection,  with  hose  connecting  piece  and  adjusting 

valve.     With  6-inch  scale  graduated  in  i^0   inch    divisions 7.50 

GAGE,  Drill,  see  No.  4276. 

6468.     GAGES,  Glass  Tubing,  of  steel,  for  gaging  glass    or   metal    tubing   by    outside    diameters,    with 
slots  varying  by  %  mm  in  width. 

No A  B  C  D  E  F 

For  tubing,   mm 3  to  8        8  to  12      12  to  16     16  to  20     20  to  24     24  to  28 

Each     4.50  4.50  4.50  4.50  4.50  4.50 

GAGES,  Heat,  see  Pyrometers. 

6472.    GAGE,  Marking,  of  boxwood,  adjustable,  steel  point,  brass  thumb  screw  and  shoe.    Six-inch  scale 
by  16ths;  8*4  inches  over  all 60 

GAGES,  PRESSURE 

6474.  GAGE,  Pressure,  commercial  type,  improved  single  spring  form,  for  air,  steam  or  water  pressure; 

iron  case  with  nickel-plated  trimming,  3%-inch  dial,  range  0  to  30  pounds  per  square  inch. 
Provided  with  stopcock,  and  nipple  for  attaching  hose 6.00 

6475.  GAGE,  Pressure.     Same  as  No.  6474,  but  with  range  0  to  100  pounds 6.00 

6476.  GAGE,  Combination  Pressure  and  Altitude,  especially  valuable  for  work  in  hydraulics,  for  indi- 

cating the  height  and  pounds  pressure  per  square  inch  of  water  in  pipe  or  reservoir.  Pro- 
vided with  stopcock,  and  nipple  for  attaching  hose. 

To  raise  a  column  of  mercury  2.04  inches  or  to  raise  a  column  of  water  27.67  inches  requires  one 
pound  pressure. 

Iron  case  with  nickel  trimmings,  3V2-inch  dial,  0  to  30  Ibs.  and  0  to  70  ft 7.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


273 


Nos.  6480-2. 


No.  6500. 


No.  6490. 


No.  6504. 


No.  6510. 


6478.  GAGE,  Pressure,  Standard,  so-called  test  gage.  A  gage  of  extreme  accuracy,  graduated  by  means 
of  an  open  column  of  mercury  and  tested  under  the  most  severe  conditions.  Extremely  sensi- 
tive under  all  pressures  and  guaranteed  to  be  absolutely  correct  when  shipped.  Eange,  0  to 
100  Ibs.,  with  stopcock,  and  nipple  for  attaching  hose.  Entirely  of  brass,  case  nickel-plated. 
?U-60 

GAGE,  Pressure,  for  gas  cylinders,  see  Nos.  6530,  6544  and  6556. 

6480.  GAGE,  RAIN,  similar  to  United  States  Weather  Bureau  type,  but  smaller.  A  zinc  vessel  3 
inches  in  diameter  by  13  inches  long,  in  the  top  of  which  is  placed  a  copper  cup  having  an 
open  top  exactly  3  inches  in  diameter  with  sharp  edge  and  projecting  rim.  The  bottom  of 
this  copper  cup  is  open  and  fits  in  the  top  of  a  brass  tube  1  inch  in  diameter  in  which  the 
amount  of  rain  is  measured.  This  tube  is  provided  with  an  overflow  opening  and  a  wood 
rule  graduated  for  reading  the  rainfall  directly  to  ^looth  of  an  inch 3.50 

0482.  GAGE,  RAIN,  United  States  Weather  Bureau  Standard,  similar  to  No.  6480,  but  8  inches  in 
diameter  and  23  inches  long,  with  both  inner  and  outer  tubes  of  brass.  Complete  with  meas- 
uring stick  10.00 

6486.    GAGE,  Screw  Pitch,  with  24  pitches,  4  to  30  threads  to  the  inch;  V  thread 1.75 

6490.    GAGE,  Tube,  of  steel.     For  measuring  the  internal  diameters  of  tubing,  etc.     Scale  range,  1  to  15 
mm.     Graduated  to  I^Q  mm 1.00 

6494.  GAGE,  VACUUM,  or  MANOMETER,  for  use  with  air  pumps  which  are  provided  with  a  vie-inch 
opening  tapped  with  16  threads  to  the  inch.  Enclosed  in  glass  tube  with  oxidized  scale  14  em 
long,  graduated  in  millimeters.  Filled  with  mercury,  ready  to  attach  to  pump 7.00 

6496.  GAGE,  VACUUM,  or  MANOMETER.  To  be  used  under  any  bell  jar  which  is  8  inches  or  more 
high.  Tube  is  mounted  on  a  base  with  millimeter  scale.  Filled  with  mercury,  ready  for  use. 
1.80 

6500.  GAGE,  VACUUM,  or  MANOMETER,  of  glass,  with  stop-cock  and  movable  mirror  scale  graduated 
in  millimeters  for  13  cm  above  and  below  the  zero  line.  Filled  with  mercury  and  mounted  on 
a  wood  support 15.00 

6504.      GAGE,  Vacuum.     Same  type  and  description  as  No.  6474.     Range  0  to  30  inches 6.00 

6506.  GAGE,  Combination  Pressure  and  Vacuum,  combining  Xos.  6474  and  6504,  showing  both  pressure 
and  vacuum  on  one  dial;  3%-inch  dial,  in  iron  case  with  nickel  trimmings 7.50 

6508.  GAGE,  Vacuum,  Standard.     Same  type  and  description  as  Xo.  6478.  Eange  0  to  30  inches.     14.60 

6509.  GAGE,  Combination  Pressure  and  Vacuum,  Standard.     Combines  Nos.  6478  and  6508,  showing 

both  pressure  and  vacuum  on  one  dial;  3%-inch    dial.      Entirely   of  brass,   case    nickel-plated. 
17.75 

6510.  GAGE,  Vacuum,  McLeod's,  for  measuring  high  vacua,  for  use  in  connection  with  Cenco-Xelson 

and  similar  high  vacuum  pumps.     Will  read   to   0.001  mm.      Mounted  on  wooden  stand,  with 

directions  for  use i 45.00 

GAGES,  Wind,  see  Anemometers. 


274 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  651 4A. 


No.  6530. 


No.  6540. 


6514.   GAGES,  Wire,  American  standard,  of  best  tempered  steel. 

No A  B 

Sizes 0  to  36  5  to  36 

Each  $3.00  2.50 

GALVANOMETERS,   see  Electrical  Instruments. 

GASES  COMPRESSED  IN  CYLINDERS 

6524.  GAS,  Ammonia,  liquefied,  in  cylinders  of  50   pounds per   pound        .50 

6525.  CYLINDER  for  No.  6524  extra  (returnable  for  refilling  only) 20.00 

6528.  GAS,  Carbonic  Acid,  liquefied,  in  cylinders  of  20  pounds,  per  pound 25 

6529.  CYLINDER  for  No.  6528  (returnable  for  credit,  less  a  rental  charge  of  1  cent  per  day  after 

60   days)    30.00 

Note: — If  desired,  name  plate  with  name  of  institution  will  be  attached  without  extra  charge. 
In  this  case,  the  cylinder  is  returnable  for  refilling  only. 

6530.  REGULATOR,  Constant  Pressure,  for  carbon  dioxide  tanks,  for  delivering  carbon  dioxide  at 

any  desired  pressure  from  5  to  300  pounds.     Complete  with  regulator  and  gage  reading  to 
300  pounds  in  5-pound  divisions 15.00 

6532.  GAS,  Chlorine,  liquefied,  in  cylinders  of  about  100  pounds per  pound       .25 

6533.  CYLINDER  for  No.  6532  (returnable  for  credit  in  good  condition,  less  a  rental  charge  of  50 

cents  per  month  after  90  days) 25.00 

6536.  GAS,  Hydrogen,  pure,  compressed  in  steel  cylinders. 

No. A  B 

Capacity,  cubic  feet 25  50 

Price  of  gas 2.50        5.00 

6537.  CYLINDERS  for  No.  6536  (returnable  for  credit  in  good  condition,  less  a  rental  charge  of  25 

cents  per  week  after  30  days). 

No A  B 

Each   30.00       40.00 

6540.  GAS,  Hydrogen  (Illuminating  Gas),  for  oxyhydrogen  or  lime  light,  in  steel  cylinders  tested  to 
600  pounds  pressure  per  square  inch.  The  capacity  is  figured  at  a  standard  pressure  of  225 
pounds  to  the  square  inch.  Complete  with  MacLachlan  Patent  Double  Needle  Valve,  and 
with  name  plate  engraved  with  name  and  address  of  institution. 

No A  B  C 

Capacity,  cubic  feet 25  35  40 

Dimensions  of  cylinder,  inches 10x34       12x36       12x42 

Per  cylinder  filled  with  gas 18.75       20.00       21.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A.  275 


No.  6544.  No.  6556. 

0042.  GAS,  Oxygen,  for  oxyhydrogen  or  lime  light,  in  steel  cylinders  tested  to  600  pounds  pressure 
per  square  inch.  The  capacity  is  figured  at  standard  pressure  of  225  pounds  to  the  square 
inch.  Complete  with  MacLachlan  Patent  Double  Needle  Valve,  and  with  name  plate  en- 
graved with  name  and  address  of  institution. 

No A  B  C 

Capacity,    cubic    feet 25  35  40 

Dimensions  of  cylinder,  inches 10x34       12x36       12x42 

Per  cylinder  filled  with  gas $21.85        24.35        26.25 

6543.  CYLINDERS  for  Nos.  6540  and  6542  (returnable  for  refilling  only),  refilled  with  oxygen  or 
hydrogen  per  cubic  foot  .13 

G.~44.  PRESSURE  GAGE,  indispensable  to  users  of  oxyhydrogen,  for  measuring  the  amount  of  gas 
in  a  tank.  Indicates  both  cubic  feet  and  pounds  pressure 6.00 

6546.  GAS,  Nitrogen,  compressed,  in  cylinders. 

No A  B  C 

Capacity,  cubic  feet 25  50  100 

Price  of  gas 3.75          5.00          6.25 

6547.  CYLINDERS  for  No.  6546  (returnable  for  credit  in  good  condition  less  a  rental  charge  of  25 

cents  per  week  after  30  days.) 

Xo A  B              C 

Capacity,  en.  ft 25  50  100 

Each    18.00  26.00  42.00 

6550.  GAS,  Nitrous  Oxide,  liquefied,  in  cylinders  of  100  gallons  of  gas price  of  gas     3.50 

6551.  CYLINDER  for  No.  6550  (returnable  for  credit   in   good   condition,   less    rental    charge    of    25 

cents  per  week  after  30  days) 6.00 

6554.  GAS,  Oxygen,  pure,  in  steel  cylinders,  under  pressure  of  1800  pounds  per  square  inch. 

No A  B 

Capacity,  gallons  of  gas 40  100 

Size  of  cylinder  about,  inches 3%xl4  4%x24 

Price  of  gas 2.00  5.00 

6555.  CYLINDERS  for  No.  6554  (returnable  for  credit  in  good  condition  less  a  rental  charge  of  25 

cents  per  week  after  30  days),  complete  with  wheel  valve  and  yoke  to  permit  attachment 
of  rubber  tubing. 

No A  B 

Each    7.50        13.50 

6556.  REGULATOR.  Constant  Pressure,  for  oxygen  tanks,  for  maintaining  a  uniform  pressure  of  gas 

up  to  200  pounds  per  square  inch,  when  delivered   from  high  pressure   cylinders.     With   two 
gages,  one  showing  the  pressure  in  the  tank,  the  other  the  pressure  delivered 35.00 

6557.  ADAPTER  for  use  with  No.  6556,  when  used  on  small  oxygen  tanks 4.00 

6558.  REGULATOR,  Constant  Pressure,  same  as  No.  6556,  but  with  the  smaller  gage  reading  to  30 

pounds  of  pressure  delivered,  instead  of  200 35.00 

6560.  GAS,  Sulphur  Dioxide,  in  cast  iron  cylinders  with  valve,  holding  about  10  pounds,  complete  6.00 

6561.  CYLINDER  for  No.  6560  (returnable  for  refilling  only),  refilled  with  sulphur  dioxide. . .      3.00 
GAS  ABSORPTION  TUBES,  see  Absorption  Tubes;  Ammonia  Absorption  Apparatus. 


276 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6570. 


No.  6574. 


No.  6578. 


No.  6582. 


GAS  ANALYSIS  APPARATUS 


GAS  ANALYSIS  APPARATUS,  as  developed  by  the  United  States  Bureau  of  Mines  and  used  by 
them  in  the  examination  and  precise  analysis  of  mine  air,  flue  and  furnace  gases,  natural  gas,  and 
exhaust  gases  from  gas  -engines.  (See  Bulletins  42,  74  and  97,  and  Technical  Papers  13,  14,  31  and  87 
of  the  United  States  Bureau  of  Mines.) 

6570.  APPARATUS  FOR  THE  EXACT  ANALYSIS   OF   MINE   AIR,   Laboratory  Form.     Complete 

with  glass  parts  mounted  as  shown,  with  iron  supports.  (See  Bulletin  42,  of  the  United  States 
Bureau  of  Mines,  figure  7,  page  17) $40.00 

6571.  GLASS  PARTS  only  for  No.  6570 25.00 

6574.  APPARATUS  FOR  THE  EXACT  DETERMINATION  OF  METHANE,  Laboratory  Form.    With 

this  apparatus  an  analysis  may  be  made  in  10  minutes  with  an  accuracy  of  0.01  to  0.02  per  cent. 
Complete  with  water-jacketed  measuring  burette,  temperature  compensating  device,  slow 
combustion  pipette,  manifold  with  two  stop-cocks,  manometer  and  leveling  bulb,  mounted  as 
shown  with  iron  supports,  but  without  beaker  or  sampling  tube.  (See  Bulletin  42,  figure  11, 
page  31.)  38.00 

6575.  GLASS  PARTS  only  for  No.  6574 20.00 

6578.  APPARATUS  FOR  THE  DETERMINATION  OF  METHANE  IN  MINE  AIR,  Portable  Form. 

Determinations  may  be  made  with  an  accuracy  of  0.1  per  cent.  Complete  as  shown  with 
glass  parts  mounted  in  polished  wooden  carrying  case  with  sliding  doors.  (See  Bulletin  42, 
figure  13,  page  34) 27.50 

6579.  GLASS  PARTS  only  for  No.  6578 9.00 

6582.  APPARATUS  FOR  THE  DETERMINATION  OF  CARBON  DIOXIDE  AND  METHANE,  Port- 

able Form,  similar  to  No.  6578,  but  with  the  addition  of  an  absorption  pipette  for  carbon 
dioxide.  Complete  as  shown,  in  polished  wooden  carrying  case,  with  sliding  doors.  (See 
Bulletin  42,  figure  14,  page  36) 29.00 

6583.  GLASS  PARTS  only  for  No.  6582 10.00 

6586.  APPARATUS    FOR    THE    EXACT   DETERMINATION    OF    CARBON    DIOXIDE    AND    ME- 

THANE, Laboratory  Form.  With  this  apparatus  an  analysis  can  be  made  in  15  minutes  with 
an  accuracy  of  0.01  per  cent.  Complete  as  shown  with  iron  supports.  (See  Bulletin  42,  fig- 
ure 15,  page  38) 35.00 

(For  illustration  of  No.  6586,  see  page  277.) 

6587.  GLASS  PARTS  only  for  No.  6586 21.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


277 


6590.  MODIFIED  OR  SAT  GAS  ANALYSIS  APPARATUS,  Portable  Form,  for  analyzing  mine  gases 

to  an  accuracy  of  0.2  per  cent.  The  absorption  pipettes  are  filled  with  glass  rods.  Complete 
as  shown  in  polished  wooden  carrying  case.  (See  Bulletin  42,  figure  16,  page  39) ....  $42.50 

6591.  GLASS  PARTS  only  for  Xo.  6590 25.00 

6594.  APPARATUS  TOR 'THE  ANALYSIS  OP  GAS  MIXTURES,  CONTAINING  CO,,  C,H4,  O^  CO, 

H.,,  CH4,  CoILj,  and  N2.  Laboratory  Form.  Complete  with  7  pipettes  including  slow  combus- 
tion pipette,  water-jacketed  measuring  burette,  compensating  device,  manifold  tube  with  four 
stop-cocks,  and  leveling  bulb,  mounted  in  wooden  case  with  iron  supports.  (See  Bulletin  42, 
figure  17,  page  43) 85.00 

6595.  GLASS  PARTS  only  for  No.  6594 55.00 

6598.  APPARATUS  FOR  THE   DETERMINATION  OF  HYDROGEN,  Laboratory  Form,  by  means  of 

copper  oxide  or  palladium  asbestos.  Complete  with  water-jacketed  burette,  compensating  de- 
vice, leveling  bulb,  palladium  asbestos  tube,  two  absorption  pipettes,  manifold  with  three 
stop-cocks,  and  iron  supports,  but  without  heater  for  the  palladium  asbestos  tube.  (See  Bul- 
letin 42.  figure  18,  page  54) 40.00 

6599.  GLASS  PARTS  only  for  Xo.  6598 . .  . 30.00 

6602.  APPARATUS  FOR  ANALYZING  NATURAL  GAS,  Laboratory  Form,  complete  as  shown,  with 

iron  supports.    (See  Bulletin  42.  figure  23.  page  78) 50.00 

6603.  GLASS  PARTS  onlv  for  No.  6602 35.00 


278 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  6612. 


6606.  GAS  ANALYSIS  APPARATUS,  Burrell'S,  for  determining  benzene  or  gasoline  vapor  in  gas 
mixtures  by  the  freezing  method.  (See  Journal  of  Industrial  and  Engineering  Chemistry, 
Vol.  VII,  No.  2,  for  February  1915,  page  112;  and  Technical  Paper  87,  of  the  United  States 
Bureau  of  Mines,  page  3) $10.00 

6612.  GAS  ANALYSIS  APPARATUS,  Dwights'  CO2  Indicator  (Patent  Applied  for),  for  determining 

the  percentage  of  carbon  dioxide  in  flue  gas  and  other  mixtures.  The  outfit  consists  of  a  cast 
metal  tank  with  reservoir  in  the  base  holding  enough  solution  for  300  tests.  The  tank  is  pro- 
vided with  special  inlet  valve  with  stop-cock,  and  an  aneroid  gage  reading  directly  in  percent- 
age of  CO2,  in  %  per  cent,  divisions.  The  test  is  practically  instantaneous,  requiring  only 
1  minute  to  complete.  Complete  as  described  with  6  feet  of  rubber  tubing  and  pressure  bulb 
i 25.00 

6613.  TRAVELING  CASE  for  No.  6612,  covered  with  karatol  grain  leather,  plush  lined,  with  handle 

and  nickel-plated  trimmings,  and  with  lock  and  key 3.00 

6614.  GAS  ANALYSIS  APPARATUS,  Dwights'  CO2  Indicator    (Patent  Applied   for),   same   as   No. 

6612,  but  with  mercury  gage  mounted  on  the  door  of  the  carrying  case,  for  obtaining  the  per- 
centage of  COo.  The  gage  is  specially  designed  to  prevent  spilling  of  mercury  and  is  pro- 
vided with  an  adjustable  scale  enabling  the  mercury  level  to  be  brought  to  zero  when  beginning 
a  test.  Complete  as  described  with  6  feet  of  rubber  tubing  and  pressure  bulb,  leather  covered 
carrying  case,  plush  lined,  with  handle,  nickel-plated  trimmings,  and  with  lock  and  key.  28.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


279 


No.  6628. 


No.  6632. 


No.  6636. 


No.  6650. 


C628.  GAS  ANALYSIS  APPARATUS,  Orsat-Muencke,  for  the  analysis  of  CO2,  CO,  and  O2,  especially 
adapted  for  furnace  and  flue  gases.  Consists  of  three  absorption  pipettes,  manifold  tube 
with  four  stop-cocks,  measuring  burette  with  water  jacket,  and  aspirator  bottle.  Complete 
in  portable  polished  wooden  case $35.00 

6629.     EXTRA  MANIFOLD  TUBE  for  No.  6628  with   four  stop-cocks 9.50 

(5632.  GAS  ANALYSIS  APPARATUS,  Great-Fischer,  designed  for  portability.  Similar  to  No.  6628, 
but  about  half  the  size,  with  drying  tube  inside  case,  attached  to  manifold.  Complete  with 
three  pipettes,  in  portable  polished  wooden  case 35.00 

6633.     EXTRA  MANIFOLD  TUBE  for  No.  6632,  with   four  stop-cocks 9.50 

6636.  GAS  ANALYSIS  APPARATUS,  Orsat-Lnnge,  similar  to  No.  6628,  but  with  four  pipettes  and 

bent  palladium  tube  with  lamp,  for  separate  estimation  of  hydrogen.     Complete  with  drying 
tube,   in   portable   polished  wooden   case 42.50 

6637.  EXTRA  MANIFOLD  TUBE  for  No.  6636,  with  five  stop-cocks 12.00 

6638.  EXTRA  BENT  PALLADIUM  TUBE  for  No.   6636    4.00 

Extra  Parts  for  Orsat  Gas  Apparatus  Nos.  6628,  6632  and  6636. 

6640.  ABSORPTION  PIPETTE,  plain 2.00 

6641.  ABSORPTION  PIPETTE,  filled  with  glass  tubes    2.50 

6642.  ABSORPTION  PIPETTE,  filled  with  glass  tubes  and  copper  spirals 3.50 

6643.  MEASURING  BURETTE  only  without  water  jacket 5.50 

6644.  WATER  JACKET  only  for  measuring  burette    1.25 

1614B.  ASPIRATOR  BOTTLE,  8  ounces 70 

6645.  SOFT  RUBBER  BAG  for  attaching  to  pipettes   (for  illustration,  see  page  428) 60 

6832.  RUBBER  ASPIRATOR  BULB  with  two  valves  and  rubber  connections  (see  page  428) ...       .60 

6650.  GAS  ANALYSIS  APPARATUS,  Petterson-Palmqulst,  for  determining  small  quantities  of  CO2 
in  air.  This  is  the  standard  laboratory  apparatus  recommended  by  the  American  Public 
Health  Association  for  investigations  of  ventilation  in  schools,  factories,  public  buildings, 
etc.  Complete  in  polished  wooden  case.  (See  American  Public  Health  Journal,  Vol.  "VTI,  No. 
1,  for  January  1917) 55.00 


280 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


0652. 


<i654. 
6656. 

6657. 
6660. 


6664. 


No.  6654. 


No.  6660. 


No.  6664. 


GAS  ANALYSIS  APPARATUS,  Portable  Orsat,  for  the  determination  of  CO2,  CO  and  O2.  This 
instrument  is  very  light  and  compact,  having  only  half  the  weight  and  one  fourth  the  volume 
of  the  usual  form,  and  can  be  shaken  bodily  during  an  analysis,  thus  increasing  the  rapidity 
of  the  absorption.  Complete  with  three  absorption  pipettes  of  special  form,  water  jacketed 
measuring  burette  with  stripe  to  facilitate  reading,  manifold  with  four  stop-cocks,  filtering 
tube,  aspirator  bottle  and  rubber  bags,  mounted  on  metal  stand  with  metal  cover.  Height 
over  all,  15  inches;  diameter,  5%  inches;  total  weight  charged  ready  for  use,  6  pounds..  27.50 

GAS  ANALYSIS  APPARATUS,  Portable  Orsat,  same  as  No.  6652,  but  with  only  two  absorp- 
tion bulbs,  for  CO2  and  O2 $25.00 

GAS  ANALYSIS  APPARATUS,  same  as  No.  6652,  but  with  four  absorption  bulbs,  for  CO2,  CO, 
O2  and  H2 32.00 

ASPIRATING  PUMP,  for  use  with  Nos.  6652,  6654  and  6656 1.00 

GAS  ANALYSIS  APPARATUS,  Portable  Boiler  Tester,  for  determining  the  draft  and  percent- 
age of  CO2  in  flues.  Consists  of  a  special  measuring  burette  which  is  also  used  as  a  draft 
gage,  an  absorption  pipette  of  special  form  filled  with  glass  tubes,  filter  tube  and  leveling 
bottle,  mounted  on  metal  stand  with  metal  cover.  Height  of  case,  14  inches;  diameter,  5 
inches;  weight,  4  pounds 17.50 

GAS  ANALYSIS  APPARATUS,  United  States  Steel  Corporation  Official  Type,  as  designed  by 
the  Chemists'  Committee  for  the  analysis  of  flue  and  furnace  gases.  Complete  as  shown, 
with  water-jacketed  measuring  burette,  manifold  tube  with  two  stop-cocks,  four  pipettes  with 
stop-cocks,  two  leveling  bottles,  pint  Kipp's  generator,  two  2  liter  and  one  4  liter  aspirator 
bottles,  overflow  bottle  for  explosion  pipette,  rubber  bags,  and  metal  sampling  tube  with 
brass  stop-cocks,  mounted  on  hardwood  stand,  with  directions  for  use.  (See  Metallurgical 
and  Chemical  Engineering,  Vol.  IX,  1911,  page  303;  and  "Methods  for  the  Technical  Sam- 
pling and  Analysis  of  Gases, ' '  of  the  United  States  Steel  Corporation) 80.00 


Extra  Parts  for  No.  6664. 


6665.  MANIFOLD  TUBE  with  two  stop-cocks 10.50 

6666.  EXPLOSION  PIPETTE 5.00 

6667.  ABSORPTION  PIPETTE  for  liquids 6.50 

6668.  ABSORPTION   PIPETTE   for   solids 5.00 

6669.  MEASURING  BURETTE  with  water  jacket 10.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  a  A. 


281 


No.  6692. 


Nos.  6676-7. 


No.  6678. 


No.  6694. 


6676.  GAS  ANALYSIS  APPARATUS,  Williams'  Improved,  Model  A,  for  the  complete  analysis  ol 
combustible  gases,  with  special  form  of  bubbling  pipettes  designed  to  increase  the  rapidity 
of  absorption  and  to  decrease  the  possibility  of  breakage.  Complete  with  four  special  bub- 
bling pipettes  with  stop-cocks,  filled  with  glass  tubes,  manifold  tube,  water-jacketed  measur- 
ing burette  with  stop-cock,  leveling  bottle,  three-way  stop-cock  and  aspirator  pump,  in  pol- 
ished oak  case  lined  with  rubber.  Height,  17%  inches;  width,  12  inches;  depth,  4 
inches  $50.00 

6fi77.  PORTABLE  EXPLOSION  COIL  for  use  with  Xo.  6676  in  determining  methane.  Complete  with 
batteries  in  polished  oak  case 7.50 

6678.  GAS  ANALYSIS  APPARATUS,  Williams'  Improved,  Model  B,  for  analysis  of  flue  gases,  sim- 
ilar in  construction  to  No.  6676,  but  with  three  bubbling  pipettes  for  determining  CO2,  CO, 
and  O2.  Complete  with  three  pipettes  with  stop-cocks  and  glass  tubes,  manifold  tube,  water- 
jacketed  burette  with  stop-cock,  leveling  bottle,  three-way  stop-cock  and  aspirating  pump, 
in  polished  oak  case,  lined  with  rubber.  Height,  17%  inches;  width,  9%  inches;  depth,  4 

inches  35.00 

GAS  APPARATUS,  Bunsen-Fresenius,  for  chlorine,  see  Chlorine  Absorption  Apparatus. 

6692.  GAS  APPARATUS,  Chancel's,  for  determining  the  specific  gravity  of  gases.  With  ground  in 
stop-cock  tube  and  side  arm 4.50 

6694.  GAS  APPARATUS,  Elliotts'  Improved  Form,  for  determining  sulphur  in  illuminating  gas,  as 
described  in  Technologic  Paper  No.  20  and  Circular  No.  48  of  the  United  States  Bureau  of 
Standards.  Complete  with  burner,  trumpet  tube,  towers  filled  with  glass  marbles  and  con- 
necting tubes,  mounted  on  support,  without  beakers  25XX) 


282 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


H, 


No.  6696.         No.  6698.  No.  6704.      No.  6730.      No.  6732.  No.  6736. 


No.  6740. 


No.  6720. 


No.  12900. 


6696.  GAS  APPARATUS,  Hinman- Jenkins',  for  Sulphur,  complete  with  condensing  tube  filled  with 
glass  beads,  adapters,  overflow  tube,  watch  glass,  connectors  and  burner  fitted  with  special 
lava  tip,  but  without  Erlenmeyer  flask.  (See  Technologic  Paper  No.  20  of  the  United  States 

Bureau  of  StandarSs) $18.50 

6698.    GAS  APPARATUS,  Referees',  for  Sulphur,  complete   as   illustrated  with   burner   and   support, 

without   flask    20.00 

6704.     GAS  APPARATUS,  Ruedorff's,  for  determining  carbon  dioxide  in  illuminating  and  other  gases. 
Complete  with  bottle,  rubber  stoppers,  and  ground  in  glass  tubes,  with  three  stop-cocks      9.00 
GAS  APPARATUS,  Wolpert's,  for  carbon  dioxide  in  air,  see  No.  146. 
6720.    GAS  BAGS,  Rubber,  oval  form,  without  stopcock. 

Capacity,  gallons 1 

Each 3.00  3.25  3.80  5.00 

12900.    STOPCOCK,  Brass,  for  No.  6720  Gas  Bags.     One  end  for  attaching  rubber  tubing,  the  other  a 

%x21/£-inch  brass  tube  for  nozzle  of  gas  bag 90 

6722.    GAS  BAGS,  Rubber,  same  as  No.  6720,  but  with  brass  stopcock. 

Capacitv,  gallons 1  2  3  5 

Each  .  .' 4.00  4.25  5.25  6.25 

GAS  BALLOONS,  see  Balloons,  Glass. 
6730.     GAS  BURETTE,  Bunte's,  with  two  stop-cocks,  without  water  jacket.     Graduated  from  -10  to 

50  cc  in  Vioth,  and  from  50  to  100  cc  in  1  cc   divisions 8.00 

6732  GAS  BURETTE,  Bunte's,  same  as  No.  6730,  but  with  water  jacket  fitted  with  rubber  stop- 
pers    10.00 

6736.  GAS  BURETTE,  Hempel's,  without  stop-cocks,  set  in  heavy  metal  bases,  with   one   plain   bu- 

rette, and  one  burette  graduated  to  100  ce  in  %  co  divisions 9.30 

6737.  GRADUATED  BURETTE  only  of  No.  6736 3.50 

6740.  GAS  BURETTE,  Hempel-Winkler,  same  as  No.  6736,  but  with  graduated  burette  provided  with 

two   stop-cocks 15.00 

6741.  GRADUATED  BURETTE  only  of  No.  6740  with   stop-cocks 9.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


283 


No.  6744. 


6744.  GAS  BURETTE,  Hempel's.  with  compensating  tube  to  correct  for  variations  in  temperature 

and  pressure.     Complete  with  stop-cock  and  leveling  bulb,  mounted  on  weighted  metal  bases, 
as   illustrated    $20.00 

6745.  GRADUATED  BURETTE  only  of  No.  6744,  with  three-way  stop-cock 7.00 

6746.  LEVELING  BULB  for  No.  6744,  mounted  on  heavy  base 3-50 

6747.  GLASS  BULB  only  of  No.  6746 1-00 

6750.  GAS  BURETTE,  Hempel-Tutweiler,  with  four-way    stop-cock,    compensating    tube,    manometer, 

water  jacket,  and  leveling  bulb,  mounted  on  heavy  metal  bases 22.00 

6751.  GRADUATED  BURETTE  only  of  No.  6750,  with  special  four-way  stop-cock 10.00 

6754.  GAS  BURETTE,  Hempel's,  modified  by  the  Illinois  Steel  Company,  with  burette  graduated  to 

100  cc  in  140  cc  divisions,  three-way  stop-cock,  and  water  jacket,  without  support 8.00 

6755.  GRADUATED  BURETTE  only  of  No.  6754,  with  special  three-way  stop-cock 6.00 


3770. 


6771. 
6914. 


GAS  CALORIMETERS  AND  ACCESSORIES 

GAS  CALORIMETER,  Parr's.  This  calorimeter  measures  the  calorific  value  of  any  gas  by  burn- 
ing under  identical  conditions  the  unknown  gas  along  with  a  standard  gas  of  known  composi- 
tion, so  that  equal  volumes  of  both  under  equal  pressures  and  temperatures  impart  their  heat 
to  equal  volumes  of  water.  The  heat  values,  therefore,  are  in  direct  proportion  to  the  read- 
ings of  the  two  thermometers.  Thus  all  metering  of  the  gas  is  avoided,  it  being  necessary  only 
to  maintain  exact  equivalents  or  multiples  by  means  of  the  calibrated  gas  holders.  Complete 
as  illustrated,  with  automatic  generator  for  standard  gas  (pure  hydrogen),  electric  motor  for 
driving  the  stirring  apparatus,  two  angle  thermometers  with  reading  lenses,  pilot  lamp,  gravity 
tank,  one  2-pound  can  of  Hydrone  and  instruction  book.  (See  Journal  of  Industrial  and  Engi- 
neering Chemistry,  Vol.  H,  No.  8,  for  August  1910,  page  337) 325.00 

EXTRA  THERMOMETERS,  angle  form,  for  No.  6770 each    12.00 

HYDRONE  for  No.  6770,  in  2-pound  cans each      2.50 


284 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  6780-8. 


No.  6786. 


6780.  GAS  CALORIMETER,  Sargent's  Automatic,  for  testing  the  thermal  value  of  inflammable  gases. 

Distinctive  Features. 

(1)  The  discharge  water  is  weighed  to  one-hundredth  of  a  pound  instead  of  being  measured 
in  a  graduate. 

(  2)  The  discharge  water  is  switched  automatically  from  one  receptable  to  another  after  each 
one-tenth  of  a  cubic  foot  of  gas  is  burned.  This  eliminates  errors  due  to  hand  manipu- 
lation. 

(  3)  Inlet  and  outlet  thermometers  are  on  the  same  level  so  that  they  can  be  read  almost  simul- 
taneously. 

(  4)  A  wet  pressure  governor  controls  the  pressure  of  the  gas  entering  the  burner,  and  a  con- 
stant pressure  is  easily  maintained  by  means  of  adjustable  weights. 

(  5)  To  maintain  a  constant  flow  the  inlet  and  outlet  pipes  are  provided  with  weirs.  A  gradu- 
ated quadrant  valve  regulates  the  amount  of  water  used. 

(  6)  Since  a  determination  can  be  made  every  three  or  four  minutes,  a  curve  of  the  heat  value 
extending  over  any  length  of  time  may  be  plotted. 

(  7)    The  heat  value  of  the  gas  is  determined  directly  in  B.T.U. 

(  8)  The  Bunsen  burner  has  two  tips  and  is  adjustable  for  gas  having  100  to  1500  B.T.U.  per 
cubic  foot. 

(  9)    The  calorimeter  is  made  of  copper  and  brass  and  is  handsomely  nickel-plated. 

(10)  The  wet  test  gas  meter  is  made  of  heavy  brass  and  tin  and  has  a  water  level  indicator 
outside  of  the  gage  glass.  The  meter  is  graduated  to  0.001  cubic  feet. 

Complete  as  described  above,  with  calorimeter  body,  wet  pressure  governor,  wet  test  gas  meter, 
special  scales,  pair  of  weighing  pails,  and  two  No.  13537A  Thermometers 300.00 

Parts  and  Accessories  for  No.  6780. 

6781.  CALORIMETER  BODY,   with  automatic   attachment,  Bunsen  burner,  tubing,  exhaust   thermo- 

meter and  beaker 135.00 

13536A.  THERMOMETER,  Precision,  graduated  from  60"  to  110°F.  in  one-tenth  degree  divisions,  for 

inlet  and  outlet  temperatures,  with  calibration  curve  18.00 

13537A.  THERMOMETER,  Precision,  same  as  No.  13536A,  but  with  Bureau  of  Standards  certificate  25.00 
13540.  THERMOMETER,  High  Grade,  graduated  from  30°  to  150°F.  in  one-tenth  degree  divisions,  for 

inlet  and  outlet  temperatures.     Suitable  for  all  ordinary  work 8.50 

6785.  WET  PRESSURE  GOVERNOR,  with  weights 17.00 

6786.  WET  TEST  GAS  METER,  with  all  attachments    65.00 

6787.  SCALES,  Special,  weighing  to  hundredths  of  a  pound.     Capacity,  10  pounds 16.50 

6788.  WEIGHING  PAILS,  nickel-plated,   accurately  balanced per  pair      6.00 

6789.  SHIPPING  CHEST,   specially  fitted  for  holding  a  complete  calorimeter  outfit  in  separate  com- 

partments    55.00 

6790.  TABLES  OF  STANDARD  REDUCTION  FACTORS  FOR  GAS,  in  book  form 1.50 

6791.  HEAT  VALUE  COMPUTER,  U.  G.  1 3.50 

13730.  READING  LENS  for  thermometer 3.00 

6793.  MANOMETER,  reading  to  0.01  inch 18.00 

6794.  MANOMETER  for  differential  readings 20.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


285 


No.  6795. 


No.  6798. 


No.  6810. 


6795.  GAS  EJECTOR  for  raising  pressure  of  gas  in  suction  producer  to  force  it  through  meter  and 
burner. 

No A  B  C 

Capacitv,  eu.  ft.  per  min 0.1  0.2  0.5 

Each    .'. $15.00       18.00        25.00 

6798.  DUST.  TAR  AND  MOISTURE  DETERMINATOR  for  illuminating  gas,   complete   with   meter, 

two  dust  filters  and  calcium  chloride  flasks  160.00 

6799.  DUST  FILTER  WELL  only  of  No.  6798,  without  meter 45.00 

6810.     CALORIMETER,  Junkers,  Mann's  modification,  for  determining  the  approximate  heating  value 

of  gas.  Consists  of  a  double  walled  copper  vessel  provided  with  a  number  of  tubes  or  flues  so 
arranged  as  to  receive  the  heat  from  a  Buns?n  flame.  These  tubes  coming  in  contact  with  water 
which  is  running  continuously  through  the  Calorimeter  give  up  their  heat.  A  thermometer 
placed  in  the  orifice  at  the  top  registers  the  temperature  of  water  at  delivery,  a  second  ther- 
mometer placed  in  orifice  at  the  bottom  registers  the  temperature  at  entrance.  Any  convenient 
gas  measuring  apparatus  will  give  the  amount  of  gas  supplied  the  burner.  (See  No.  6812  Thorp 
Gage,  or  No.  6814  Gas  Meter.)  A  vessel  placed  to  catch  water  delivered  gives  amount  of  water 
passing  through  the  Calorimeter.  Complete  with  support,  but  without  gas  meter  or  ther- 
mometers    10.00 

6812.  THORP  GAGE,  a  convenient  means  of  measuring  approximately  both  the  pressure  and  the  rate  of 
flow  of  gas.  When  the  gas  supply  is  attached  to  the  inlet  and  the  cap  is  screwed  down  over  the 
outlet  at  top,  the  index  reads  on  left  hand  scale  the  pressure  in  inches  of  water.  When  testing 
the  consumption  of  a  burner,  the  pressure  cap  is  unscrewed  and  the  burner  screwed  in  its  place. 
The  indicator  then  registers  on  the  right  hand  scale  the  number  of  cubic  feet  of  gas  consumed 
per  hour 16.00 

(5S14.  GAS  METER,  Constant  Pressure,  for  use  with  No.  6810,  consisting  of  a  galvanized  iron  tank 
in  which  a  gas  tank  having  a  capacity  of  about  2  cubic  feet  is  floated.  Only  a  small  amount 
of  oil  or  water  is  required.  The  gas  tank  is  kept  in  an  upright  position  by  two  vertical 
guides,  one  of  which  is  provided  with  a  scale  so  graduated  that  readings  of  the  contents  of 
the  tank  may  be  made  to  within  0.01  cubic  foot.  The  tank  is  provided  with  inlet  and  outlet 
stop-cocks  of  brass  and  with  a  manometer  graduated  in  millimeters  for  indicating  the  gas 
pressure,  which  may  be  varied  by  means  of  weights  placed  on  the  tank.  A  counterpoise  is 
provided  both  for  filling  the  tank  and  for  adjusting  the  pressure  on  the  gas.  Complete  as 
described  with  weights  of  1,  2  and  5  kilos  and  a  weight  hanger  weighing  1  kilo 50.00 

6816.  CONSTANT  LEVEL  WATER  TANK  or  Weir,  for  use  with  No.  6810  Calorimeter  or  any  other 
device  in  which  the  flow  of  water  at  a  uniform  pressure  is  important.  Consists  of  a  metal 
tank  of  about  350  cc  capacity,  provided  with  inlet  and  outlet  tubes  properly  arranged,  and 
with  a  clamp  for  attaching  to  an  upright  support  rod  of  *£-inch  diameter 4.00 

GAS  COCKS,  see  Stop-Cocks. 


286 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


6824. 

6826. 
6830. 

6832. 
6836. 
6838. 
6844. 

6850. 


6851. 


I 


No.  6824.   No.  6826.      No.  6830.     No.  6832.       No.  6836.   No.  6838. 


No.  6850. 
Sectional  Diagram. 


No.  6844. 


250 
4.50 


500 
4.80 


No.  6851. 
No.  6850. 

GAS  COLLECTING  TUBES,   of  glass,  long  form,  with  two  glass  stop-cocks. 

Capacity,    cc 125 

Each $4.30 

GAS  COLLECTING  TUBE,  short  form,  of  glass  with  two  stop-cocks.     Capacity,  125  cc. .      4.30 

GAS  COLLECTING  TUBE,  Illinois  Steel  Company's,  of  glass  without  stop-cocks.  Capacity, 
about  250  cc 1.50 

GAS  COLLECTING  TUBE,  Rubber,  double  acting,  for  use  in  filling  tubes  and  bottles  with 
sample  to  be  tested 60 

GAS  COLLECTING  TUBE,  Winkler's,  of  zinc  with  two  brass  stop-cocks.  Length,  12  inches; 
diameter,  4%  inches 4.50 

GAS  COLLECTING  TUBES,  United  States  Bureau  of  Mines  Form,  of  glass,  with  two  stop- 
cocks. Capacity,  125  cc.  (See  Bulletin  97,  United  States  Bureau  of  Mines,  page  53)  6.00 

GAS  COLLECTOR,  Doremus,  for  collecting  gases  from  canned  goods  for  analysis.  Consists  of 
an  adjustable  clamp  with  hollow  needle  and  thumb-screw.  A  rubber  gasket  prevents  the 
escape  of  gas  around  the  needle 4.00 

GAS  DENSITY  BALANCE,  Edwards,  developed  at  the  National  Bureau  of  Standards  for  the 
rapid  and  accurate  determination  of  the  specific  gravity  of  gas.  In  point  of  speed  it  is  far 
superior  to  the  method  of  direct  weighing  of  the  gas  on  an  analytical  balance,  and  gives  an 
accuracy  only  obtainable  by  the  latter  method  when  carried  out  with  elaborate  precautions. 
The  apparatus  consists  of  a  balance  beam  B  carrying  a  sealed  cylinder  on  one  end  and  a 
counterweight  on  the  other.  The  balance  beam  with  its  support  is  mounted  in  a  gas-tight 
chamber  to  which  is  attached  a  mercury  manometer.  In  operation,  the  balance  case  and 
manometer  connections  are  filled  with  dry  air  through  the  inlet  I  and  the  pressure  adjusted 
by  removing  the  excess  gas  through  the  needle  valve  E  until  the  beam  just  balances,  as  de- 
termined by  observation  through  the  adjustable  lens  L  of  the  cross  line  on  the  end  of  the 
beam.  After  determining  this  pressure,  the  balance  is  evacuated  through  E  and  filled  with 
the  gas;  the  pressure  is  then  adjusted  until  the  beam  is  again  in  equilibrium.  The  specific 
gravity  of  the  gas  is  then  the  ratio  of  the  total  pressure  (manometer  reading  plus  atmospheric 
pressure)  required  to  balance  the  beam  in  air  to  the  total  pressure  required  to  balance  it  in 
the  gas.  Complete  as  described  with  manometer  and  mercury  for  charging,  in  carrying  case 
with  directions  for  use.  (See  Technologic  Paper  No.  89  of  the  United  States  Bureau  of 
Standards)  100.00 

LEVELING  BOTTLE  for  No.  6850,  with  stop-cocks  and  reservoir  but  without  rubber  tub- 
ing    9.00 

For  PUMPS  for  use  with  No.  6850,  see  general  heading  Pumps. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TT.  S.  A. 


287 


No.  6866. 


No.  6872. 


No.  6874. 


No.  6882.        No.  6884. 


No.  6886. 


6858.     GAS  DISTRIBUTOR,  with  three  side  tubes  with  stop-cocks,  and  no  center  burner $5.50 

6860.     GAS  DISTRIBUTOR,  with  four  side  tubes  and  center  burner,  all  with  stop-cocks 7.70 

GAS  DRYING  APPARATUS,  see  Drying  Apparatus. 

6866.  GAS  FILTER,  of  glass,  for  determining  dust  in  furnace  and  other  gases,  with  ground  in  con- 
necting tube  and  projections  to  support  extraction  thimble.  Length  of  enlarged  portion,  2% 
inches;  diameter  at  top,  2%  inches;  diameter  of  connecting  tube  at  top,  1  inch.  Without 

thimble     3.50 

GAS  GENERATING  MACHINE,  see  Gas  Machines  No.  6936. 
6872.    GAS  GENERATING  BOTTLES,  without  fittings. 

Capacity,  pints %  1  2  4 

Each  . .' 17  .22  .30  .45 

6874.    GAS  GENERATING  BOTTLES,  same  as  No.  6872,  but  fitted  with  rubber  stopper,  funnel  tube 

and  delivery  tube.        Capacity,  pints %  1  2  4 

Each 50  .55  .67  .90 

6882.    GAS  GENERATOR,  Dropping,  Freas,  an  effective,  cleanly,  economical  method  of  obtaining  any 

gas  desired  for  use.     Without  flask 5.00 

6884.  GAS  GENERATOR,  Hind's,  for  hydrogen  sulphide  and  other  gases;  intended  for  individual 
use.  Complete  with  stop-cock  funnel  tube,  stop-cock  delivery  tube  and  rubber  stopper.  (See 

Journal  of  American  Chemical  Society,  Vol.   yxxilf,   page   384) 5.00 

6886.  GAS  GENERATOR,  Improved  Automatic,  of  stoneware.  A  simple  and  efficient  generator  for 
the  production  of  hydrogen  sulphide,  carbon  dioxide,  hydrogen  and  other  gases  in  consider- 
able quantity  for  industrial  and  college  laboratories.  In  use,  the  long  upright  column  is  filled 
nearly  full  of  the  necessary  solid  reagent  and  the  lower  reservoir  with  water.  The  fittings 
are  then  put  in  place  and  the  upper  reservoir  filled  with  the  liquid  reagent.  Normal  pressure 
is  soon  generated,  and  as  soon  as  the  tension  T  is  obtained  in  the  lower  reservoir,  acid  is  auto- 
matically delivered  to  the  top  of  the  column  as  required  and  the  generator  is  ready  for  con- 
tinuous operation  with  very  little  further  attention.  The  upper  reservoir  and  the  lower  res- 
ervoir and  column  are  of  acid-proof  chemical  stoneware  and  all  necessary  glass  parts  and 

rubber   stoppers   are   furnished 25.50 

fi887.     LOWER  RESERVOIR  and  Column  only  of  No.  6886 16.50 

6888.  UPPER  RESERVOIR  only  of  No.  6886". 4.50 

6889.  GLASS  DISTRIBUTOR  of  No.  6886 1.25 

6S96.     GAS  GENERATORS,  Kipp's  Apparatus,  of  glass,  complete  with  safety  funnel  tube,  stopcock, 

ground-in  glass  stopper,  and  rubber  stoppers.     Capacity,  cc 500        1000        2000 

Each   ". $9.00      11.00      15.00 

6898.  STOPCOCK  only  of  No.  6896 1.75 

6899.  FUNNEL  TUBE  only  of  No.  6896 40 


288 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6910. 


No.  6908. 


No.  6924. 


Nos.  6916-18. 


6908.  GAS  GENERATOR  for  Oxygen,  of  metal,  9%  inches  high;  weight,  2%  pounds.  Generates  a 
steady  supply  of  pure  oxygen  from  Oxone  or  peroxide  of  sodium  in  cartridge  form.  The 
cartridges  come  in  hermetically  sealed  tin  cans,  which,  when  placed  in  the  generator,  are 
punctured.  Each  cartridge  will  furnish  about  14  or  15  gallons  of  oxygen,  which,  if  passed 
through  a  wash  bottle  containing  water,  will  be  100  per  cent.  pure.  As  it  comes  from  the 
generator  it  is  99.3  per  cent,  pure $17.50 


6909.     CARTRIDGES  for  No.  6908. 

Each    

Per  box  of  20 


.60 
5.00 


6910.  GAS  GENERATOR,  Oxygen,  "Autogenor,"  high  pressure,  for  producing  a  supply  of  pure  oxygen 

from  oxone  at  pressures  up  to  50  pounds.    Complete    as   illustrated 27.00 

6911.  OXONE,  for  No.  6910  in  round  cakes  weighing  6%  to  7  ounces  and  yielding  1  cubic  foot  each; 

in  tins  of  6  cakes per  tin     1,25 

6912.  GAS  GENERATOR,  Hydrogen,   "Autogenor,"  same  as  No.  6910,  but  with  special  arrangement 

for  generating  pure   hydrogen  from  Hydrone    28.00 

6913.  EXTRA  HOLDER  for  No.  6912,  for  use  with  Oxone.    By  the  purchase  of  this  extra  holder,  the 

same  generator  may  be  used  for  both  hydrogen   and   oxygen 1.00 

6914.  HYDRONE  for  No.  6912,  in  tins  holding  2  pounds  and  yielding  26  cubic  feet  per  pound. 

Per    tin , 2.50 

GAS  GENERATOR,  Retort,  for  oxygen,  see  Retorts,  Copper,  No.  11462. 

6916.     GAS  HOLDERS    (Gasometer),   Pepys-Berzelius,  improved  form,  made  of  heavy  zinc,  with  brass 
fittings  and  water  gage. 

Capacity,    gallons 5  10 

Each    25.00         30.00 

6918.     GAS  HOLDERS  (Gasometer),  Pepys-Berzelius,  same  as  No.  6916,  but  of  heavy  copper. 

Capacity,  gallons   5  10 

Each    30.00         37.50 

For  CONSTANT  PRESSURE  GAS  HOLDER,  see  No.  6814. 

6924.     GAS  LIGHTER,  improved,  producing  by  friction  a  flash   of  hot  sparks,  which  will   light   any 
kind  of  gas  or  inflammable  vapors 50 


6925.    SPARK  METAL  RENEWAL  for  No.  6924. 


.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


289 


No.  6944.  No.  6946.     No.  6948. 


6936.  GAS  MACHINES,  Matthews,  for  the  automatic  production  of  gas  for  laboratory  use,  where  a 
source  of  natural  or  illuminating  gas  is  not  available.  The  machine  consists  essentially  of 
a  carburetor  to  contain  the  gasoline  and  supply  the  gas,  an  air  pump  or  blower  to  furnish  the 
air,  an  automatic  mixer  for  producing  the  proper  mixture,  a  weight  which  furnishes  the 
motive  power  for  the  air  pump,  and  the  necessary  connections.  The  entire  process  is  auto- 
matic, it  being  necessary  only  to  wind  the  weight  up  once  a  day,  and  to  fill  the  carburetor 
once  or  twice  a  year  with  gasoline.  There  is  no  danger  in  connection  with  this  machine  and 
no  extra  insurance  required  as  it  has  been  passed  by  the  National  Board  of  Underwriters. 
Complete  as  described  with  air  pump,  carburetor,  mixer,  pulleys,  wire  rope,  weight  holder 
and  all  necessary  connections,  but  not  including  gas  pipe. 

No A     B     C     D     E     F     G     H 

Number  of  burners 30     40     50     75     100    150    200    300 

Capacity  of  carburetor,  gals.   156   202%    252    315    375    437    512    770 

Number   of   cells 22334444 

Shipping    weight,    complete, 

including  mixer,  Ibs 1150        1475       1600        2125        2525        2750        3000        3900 

Each $243.00    290.00    326.00     374.00     458.00     556.00     653.00     845.0C 

6944.     GAS  MEASURING  TUBES,  of  glass,  graduated,  without  stopcock.     No...         ABC 

Capacity,   cc 25  50          100 

Graduated  in,  cc Mo          Vio  % 

Each 1.00         1.25         1.50 

6946.     GAS  MEASUEING  TUBES,  same  as  No.  6944,  but  with  glass  stop-cock. 

No A  B  C 

Capacity,    ec 25  50  100 

Graduated  in,  cc Mo  Mo  % 

Each    2.40        2.90        3.25 

6948.     GAS  MEASURING  TUBE,  Kahlenberg's,  with  stop-cock  and  funnel  top;  graduated  to  50  cc  in 

Mo   cc   divisions , 3.00 

6786.  GAS  METEE,  Wet  Test  Type,  with  dial  graduated  to  Mo  cubic  foot  in  Moootns-  Recording  train 
will  integrate  100  cubic  feet  before  repeating.  Provided  with  two  spirit  levels,  leveling 
screws,  filling  funnel,  outlet  stop-cock,  drain  plug,  gage  glass,  manometer,  thermometer,  and 

electric  switch.     Specially  adapted  for  calorimeter  work   65.00 

6956.  GAS  METEE,  for  Photometric  Work,  with  Math  cubic  foot  drum,  and  hourly  rate  dial  reading 
from  0  to  5  cubic  feet  per  hour.  At  the  legal  rate  for  candle  power  determination,  5  cubic 
feet  per  hour,  the  large  pointer  makes  one  revolution  per  minute.  Maximum  capacity  per 
hour  with  ^0  inch  differential  pressure,  18  cubic  feet.  Complete  with  water  gage,  ther- 
mometer, two  spirit  levels  and  leveling  screws;  finished  in  dead  black 75.00 


290 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


CENTRAL     H     SCIENTIFIC™ 
No.  6970. 


No.  F6857. 


No.  F6851. 


No.  6962. 


6962. 
6970. 


GAS  PALLADIUM  TtTBE,  Hempel'S,  for  hydrogen  determinations,  containing  about  2V2  grams 
of  palladium  sponge $7.50 

GAS  PHOTOMETER,  simple  form,  for  determining  candle  power  of  illuminating  gas.  Consists 
of  nickeled  steel  rod,  graduated  from  0  to  200  cm  in  1  mm  divisions;  end  supports  for  gradu- 
ated rod;  two  eye  shades  or  screens  with  supports;  Bunsen-Dibdin  photometer  box  with  clamp 
for  supporting  same;  gas  burner  mounted  on  adjustable  support  with  six-foot  tip;  and  stand- 
ard incandescent  lamp,  16  candle  power,  110  volts -. 35.00 

Parts  and  Accessories  for  No.  6970. 

F6851.  PHOTOMETEE  BOX,  Bunsen,  Dibdin's  Modification.  In  the  Bunsen  box  the  grease  spot  and 
its  surrounding  media  do  not  transmit  light  equally,  and  in  consequence  the  grease  spot  is 
never  entirely  lost,  even  when  equal  illumination  is  on  either  side.  We  have  therefore  modi- 
fled  the  Bunsen  form,  according  to  Dibdin,  and  use  a  star  of  paper  through  which  light  may 

pass.     Mounted  on  rod  to  fit  No.  F180  Clamp    3.50 

F6857.  PHOTOMETER  BOX,  Lurnmer-Brodhun,  contrast  type,  with  which  lights  of  different  color  values 
may  be  compared  more  accurately  than  with  the  disappearing  type.  Mounted  on  rod  to  fit  No. 

F180  Clamp    • 60.00 

CANDLE  HOLDER,  for  one  candle,  mounted  on  rod  to  fit  No.  F179A  Clamp 55 

CANDLE  HOLDER,  for  four  candles,  mounted  on  rod  to  fit  No.  F179A  Clamp 1.00 

LAMP  SOCKET,  Edison,  for  holding  incandescent  lamps,  mounted  on  rod  to  fit  No.  F179A 
Clamp 1-25 


F6801 
F6803 
F6817 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  S.  A. 


291 


No.  1'6933. 


No.  F6831. 


6980.  GAS  PHOTOMETER,  Precision  Ponn,  designed  for  exact  photometric  work  and  arranged  so 
that  it  may  be  used  with  a  large  number  of  accessories,  adapting  it  for  a  variety  of  uses. 
The  bed  consists  of  two  large  brass  parallel  tracks,  carried  on  supports  fitted  with  brass  lev- 
eling screws  with  sockets  for  permanent  attachment  to  bench.  The  carriages  are  substantially 
made  with  rack  and  pinion  for  vertical  adjustment  with  clamping  collar  to. prevent  slipping. 
A  pointer  extending  down  to  the  track  indicates  the  exact  location  of  the  center.  Clamps  are 
furnished  to  hold  the  carriages  at  any  desired  point.  The  observing  carriage  is  provided  with 
a  slow  motion  screw  for  careful  horizontal  adjustment.  The  carriages  are  constructed  to  take 
accessories  with  a  19  mm  rod.  Length  of  graduated  portion  of  track,  300  cm,  graduated  in  1 
mm  divisions.  Complete  as  described  with  two  end  carriages,  observing  carriage,  platform 
for  standard  lamp,  and  Lummer-Brodhun  photometer  box  with  collar  to  fit  observing  carriage; 
without  standard  lamp  or  gas  burner.  (For  illustration  see  preceding  page.) $391.00 

Parts  and  Accessories  for  No.  6980. 

F6923.  BED,  3  meters  between  lights,  graduated  in  millimeters 90.00 

F6924.  END  CARRIAGE,  for  Standard  or  Unknown  illuminant 50.00 

F6925.  OBSERVING  CARRIAGE,  for  comparison  screen  60.00 

F6926.  SOCKET,  with  cord  and  plug,  for  incandescent  lamp,  with  19  mm  rod 3.50 

F6927.  PLATFORM,  for  standard  lamp,  with  19  mm  rod   6.00 

F6928.  GRADUATED  DISC,  to  be  used  on  end  carriage  with  incandescent  lamp  to  secure  mean  horizontal 

power  of  lamp 10.00 

F6931.  COLLAR,  for  use  on  Nos.  F6924-5  when  it  is  desired  to  use  an  accessory  having  a  rod  10  mm  in 

diameter    2.00 

F6933.  UNIVERSAL  COMPOUND  ROTATOR,  for  obtaining  mean  spherical  candle  power  of  an  incan- 
descent lamp.  It  consists  of  a  heavy  frame  that  can  be  clamped  to  the  photometer  track.  The 
lamp  socket  is  attached  to  a  shaft  mounted  on  ball  bearings.  This  shaft  may  be  adjusted  in 
a  vertical  plane  by  angles  of  5°.  It  is  held  to  the  desired  angle  by  a  pin  fitting  into  a  slot  in 
the  periphery  of  an  accurately  graduated  disc.  The  horizontal  position  of  the  lamp  is  read  on 
another  graduated  circle.  The  rotator  is  provided  with  two  sets  of  brushes,  one  for  delivering 
the  lighting  current  to  the  lamp,  the  other  for  leads  to  the  electrical  measuring  instruments. 
The  rotator  is  also  provided  with  all  necessary  pulleys  and  belt  and  may  be  driven  by  any  1/12 

H.  P.  motor   , 125.00 

F6805.  GAS  BURNER,  with  6-foot  tip,  mounted  on  rod  to  fit  No.  F179A  Clamp 1.00 

F6807.  GAS  BURNER,  Welsbach,  complete,  mounted  on  rod  to  fit  No.  F179A  Clamp 2.50 

For  COLLAR  for  use  with  Nos.  F6805-7,  see  No.  F6931. 

F6831.  LAMP,  Harcourt  Pentane,  adopted  as  standard  by  the  Metropolitan  Gas  Referees  of  London 
and  used  widely  in  this  country.  Recommended  by  the  United  States  Bureau  of  Standards 
as  the  flame  standard  for  photometric  work.  Manufacturer's  rating,  9.98  candles.  Mounted 
on  adjustable  support,  with  directions  for  use  110.00 


292 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  6993. 


No.  6995. 


No.  7004. 


No.  7000. 


No.  7002. 


0993.  BURNER,  Carpenter's  Metropolitan  Argand  No.  2,  specified  as  the  official  test  burner  for  coal 
gas  by  the  Metropolitan  Gas  Referees  of  London  $25.00 

6995.  EDGERTON  STANDARD  SCREEN,  to  be  mounted  on  an  Argand  burner.  Used  widely  in  gas 
works  as  a  standard  for  candle  power  in  photometric  work  where  frequent  approximate  tests 
are  to  be  made.  Must  be  standardized  against  standard  candle 2.25 

F6665.  CANDLES,  Standard,  sperm,  six  to  the  pound,  will  burn  120  grains  (7.776  grams)  of  wax  per 
hour  i Each  .35 

6997.     CANDLE  BALANCE,  for  determining  rate  per  hour  at  which  standard  candles  burn,  complete 

with  set  of  three  twenty-grain  weights 75.00 

WET  PRESSURE  GOVERNOR,  for  delivering  gas  at  uniform  pressure  see  No.  6785. 
For  STOP  WATCH,  for  use  in  gas  testing,  see  Nos.  12954  to  12962. 

7000.  CUBIC  FOOT  BOTTLE,  Immersion  Form,  used  in  standardizing  meters  in  gas  testing.  Deliv- 
ers exactly  one  cubic  foot  of  gas  by  displacement  with  water.  Made  of  polished  brass.  With 
certificate  of  the  United  States  Bureau  of  Standards 185.00 

7002.  CUBIC  FOOT  BOTTLE,  Cabinet  Form,  of  lacquered  copper  with  nickeled  brass  fittings.  Oper- 
ates by  gravity  displacement  of  gas  by  water.  With  certificate  of  the  United  States  Bureau 
of  Standards 400.00 

7004.  CUBIC  FOOT  BOTTLE,  capacity  i^o  cubic  foot,  made  of  polished  copper  with  reservoir  of  same. 
Mounted  on  portable  wooden  stand  with  adjustable  shelves.  With  certificate  of  the  United 
States  Bureau  of  Standards 80.00 

7006.  CUBIC  FOOT  BOTTLE,  same  as  No.  7004,  but  with  a  capacity  of  ^2  cubic  foot,  with  certificate 
of  the  United  States  Bureau  of  Standards 80.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  TJ.  8.  A. 


293 


7020. 
7021. 


7032. 
7033. 


No.  7020. 


No.  7028. 


No.  7024. 

GAS  PIPETTES 

GAS  PIPETTE,  Hempel's  Simple  Absorption,  for  solid  or  liquid  reagents,  mounted  on  japanned 

iron  support   with  adjustable   clamps $1.25 

GLASS  PARTS  only  of  No.  7020 2.30 

7024.  GAS  PIPETTE,  Hempel's  Simple  Absorption,  for  liquid  reagents  only,  mounted  on  iron  sup- 

port        3.90 

7025.  GLASS  PARTS  only  of  No.  7024 2.00 

7028.  GAS  PIPETTE,  Hempel's  Double  Absorption,  for  solid  and  liquid  reagents,  mounted  on  iron 

support   5.00 

7029.  GLASS  PARTS  only  of  No.  7028 3.00 


No.  7032.                                                     No.  7036.                                                No.  7040. 
GAS  PIPETTE,  Hempel's  Double  Absorption,  for  liquid  reagents  only,  mounted  on  iron  sup- 
port         5.00 


GLASS  PAETS  only  of  No.  7032 3.00 

7036.  GAS  PIPETTE,  Hempel's  Simple  Absorption  for  Ethylene,  with  glass  beads,  mounted  on  iron 

support   5.25 

7037.  GLASS  PARTS  only  of  No.  7036 3.30 

7040.  GAS  PIPETTE,  Hempel's  Simple  Explosion,    with    glass    stop-cock    and    platinum    electrodes, 

mounted  on   iron   support 9.00 

7041.  GLASS  PAETS  only  of  No.  7040 .' 6.00 


No.  7044.  MUMM^  •  No.  7043. 

7044.  GAS  PIPETTE.  Hempel's  Explosion,  with  stop-cock,  platinum  electrodes,  separate  leveling  bulb 

and  connecting  tube,  mounted  ou  iron  support    9  50 

7045.  GLASS  PAETS  only  of  No.  7044 6.00 

7048.  GAS  PIPETTE,  He'mpel's  Explosion,  tall  form  with  electrodes  for  producing  oxygen  and  hydro- 

gen, mounted  on  iron  support 10.00 

7049.  GLASS  PAETS  only  of  No.  7048 730 


294 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  7052. 


No.  7056. 


No.  7060. 


7052. 

7053. 
7056. 

7057. 
7060. 

7061. 
7062. 


GAS  PIPETTE,  Hempel's  Double,  for  the  Preparation    of    Pure    Hydrogen,    mounted    on    iron 

support   $9.50 

GLASS  PARTS  only  of  No.  7052 7.50 

GAS  PIPETTE,  United  Gas  Improvement  Co.'s  Form,  double,  for  cuprous  chloride,  mounted  on 

iron    support 15.00 

GLASS  PARTS  only  of  No.  7056 10.00 

GAS  PIPETTE,  Winkler's,  for  the   determination  of  methane,  with  removable  platinum  spiral, 

mounted  on  a  metal  support  with  adjustable    clamps 9.50 

GLASS  PARTS  only  of  No.  7060 6.50 

PLATINUM  SPIRAL  only  of  No.  7060,  mounted  in  a  double  glass  tube 1.75 


No.  7070. 


No.  7090.     No.  7094.        No.  7098. 


No.  7102. 


7070. 


7076. 


No.  7076. 

GAS  PLIERS,  see  Pliers. 

GAS  PRESSURE  REGULATOR,  Murrill's,  for  delivering  gas  to  a  burner  at  constant  pressure. 
Widely  used  with  gas  thermostatic  regulators  (See  Nos.  13762  to  13786) 10.00 

GAS  PRESSURE  REGULATOR  for  oxygen  tanks,  see  No.  6556. 

GAS  REGULATORS,  thermostatic,  see  Thermo-Regulators. 

GAS  TIME  REGULATOR,  for  shutting  off  supply  of  gas  at  any  desired  time.  Consists  of  a 
valve  controlled  by  a  lever,  mounted  on  a  specially  constructed  clock.  Eegulator  is  placed  in 
the  line  between  gas  burner  and  supply  tap.  With  %th  inch  passage  through  valve..  5.50 
7080.  GAS  TIPS,  Aluminum,  6  foot Per  dozen  .60 

GAS  WASHING  BOTTLES 

7090.     GAS  WASHING  BOTTLES,  Allihn'S,   double  action,  with  ground  in  stoppers. 

Capacity,   cc 

Each    

7094.     GAS  WASHING  BOTTLES,  Drechsel's  high  form,  with  tubes  ground  into  neck. 

Capacity,   cc 125 

Each    1.30 

7096      GAS  WASHING  BOTTLES,  Drechsel's  low  form,  with  tubes  ground  into  neck. 

Capacity,   cc 125          250          500 

Each    1.35        1.55        2.20 

7098.     GAS    WASHING    BOTTLES,    Muencke's,    wide    mouth,    with    ground    in    tubes.      Capacity, 
250  cc  2.50 

7102.     GAS  WASHING  BOTTLES,  plain  form,  with  rubber  stopper  and  fittings. 

Capacity,    cc 250          500        1000 

Each    40  .50  .65 


250 
2.50 

250 
1.50 


500 
3.00 

500 
2.00 


CEXTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  8.  A. 


295 


No.  7150. 


No.  7154. 


GAUZE,  WIRE,  see  Wire  Gauze. 
7120.     GIMLETS,  in  sets  of  three  sizes— %,  %o  and  %6  inch Per  set  of  three     $0.20 

GLASS  BALLOONS,    see  Balloons,    Glass. 
7128.     GLASS  BEADS,  with  hole  through  center,  from  4  to  6  mm  in  diameter Per  pound       1.50 

GLASS  CUTTERS,  ALL  KINDS 

7136.    GLASS  CUTTER,  Glazier's  Diamond,  for  cutting  or  writing  on  glass.      Handle  nicely  finished; 

metal  parts  nickel-plated.     Diamond  can  be  reset  several  times.     Cuts  single-thick  glass.       5.00 

7138.    GLASS  CUTTER,  Steel  Wheel,  polished  and  bronze  finish 12 

7140.  GLASS  CUTTER,  Steel  Wheel,  having  six  cutting  wheels  in  a  turret  head  which  may  be  revolved 

on  or  clamped  to  the  frame.     The  cutters  are  protected  when  not  in  position  for  use ....         .40 

7141.  EXTRA  CUTTING  WHEELS  for  Xo.  7140 Per   dozen        .60 

7144.    GLASS  CUTTING  TOOL,  Parker's,  designed  to  replace  the  hot  file  as  an  instrument  for  cutting 

glass  by  leading  a  crack  in  the  desired  direction.  Consists  of  a  heavy  pointed  copper  head,  at- 
tached to  a  gas  supply  tube  with  wooden  handle,  the  whole  constituting  a  burner.  When  the 
air  and  gas  supply  are  regulated  to  cause  the  name  to  strike  back,  the  head  becomes  intensely- 
hot  and  can  be  used  to  cut  glass  into  almost  any  shape  desired.  (See  Journal  of  Americas 

Chemical  Society,  Vol.  XL,  Xo.   1,  January,  1918,  page  195.) 1.50 

7146.    GLASS  DISK  CUTTER.     Will  cut  disks  from  4  to  40  inches  in  diameter 70 

7148.  GLASS  DISK  CUTTER.  Will  cut  disks  from  1  to  20  cm  in  diameter.  The  cutter  arm  is  gradu- 
ated in  millimeters  and  provided  with  turret  head  having  six  cutting  wheels  as  in  Xo.  7140. 
The  apparatus  can  also  be  used  for  cutting  disks  of  cardboard,  metal  and  other  materials. 
(For  Extra  Cutting  Wheels  see  Xo.  7141.) 9.00 

7150.  GLASS  DISK  CUTTER,  with  cutting  disk  at  end  of  13  inch  adjustable  graduated  arm,  with  six 

steel  cutting  wheels:  mounted  on  heavy  brass  base  faced  with  rubber  on  under  side. . .       3.60 

7151.  EXTRA  CUTTING  WHEEL  DISK  for  No.  7150,  with  six  wheels 1.20 

7154.  GLASS  TUBING  CUTTER.     The  pressure  on  the  cutting  wheel  may  be  regulated  so  as  to  be  firm 

and  even 1-10 

7155.  EXTRA  CUTTING  WHEEL  for  Xo.  7154,  or  No.  7164 10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  7160. 


No.  7168. 


No.  7164. 


No.  7182. 


No.  7190. 


GLASS  INK,  see  Diamond  Ink  No.  3816. 
GLASS  PLATES,  see  Plates,  Glass. 

7160.  GLASS  TUBING  CUTTER  for  cutting  tubing  from  inside.     The  glass  tube  is  held  in  fiber  rests 

so  that  the  cutting  wheel  describes  a  perfect  circle.     Length  12  inches;  cuts  glass  of  from  %  to 
1  inch  inside  diameter  up  to  8  inches  length $1.50 

7161.  EXTRA  CUTTING  WHEEL  for  No.  7160 15 

7164.    GLASS  TUBING  CUTTER,  to  .clamp  on  the  table,  with  hardened  steel  cutting  wheel  and  handle 

for  producing  even  pressure.     Will  take  tubing  from  y16  to  1V2  inches.     For  extra  cutting  wheel 

see  No.  7155 6.50 

7168.    GLASS  TUBING  CUTTER,  a  highly  tempered  steel  knife  with  wooden  handle.     Both  sides  can 

be  used    1-25 

7180.  GLASS  ROD,  best  quality  lead  free  glass,  in  lengths  of  about  five  feet.  From  3  to  13  mm  in 
diameter.  Diameters  are  subject  to  usual  factory  variations.  Eod  in  smaller  quantities  than 
5  pounds  if  desired  in  full  lengths  should  be  so  specified,  otherwise  lengths  co'nvenient  for 
packing  may  be  sent.  An  additional  charge  will  be  made  for  selecting  rod  gauged  accurately. 

Diameter,    mm 3      4  to  13 

Per  pound 60          .50 

Please  specify  diameter  in  ordering. 
7182.     GLASS  RODS,  Stirring,  with  one  end  rounded,  the  other  pointed.     Size,  in.     5x%     8x%6     lOx'/i 

Per   dozen 35        .50         .60 

7184.     GLASS  ROD,  soft  glass,  for  sealing  in  platinum per  pound       .60 

7190.     GLASS  TUBING,  best  soft  glass,  lead  free,  for  glass  blowing,  bending,  etc.,  in  lengths  of  about 
five  feet.     Diameter  and  thickness  of  wall  are  subject  to  usual  factory  variations. 
An  additional  charge  will  be  made  for  selecting  tubing  gauged  accurately  inside  or  outside. 
Tubing  in  smaller  quantities  than  5  pounds,  if  desired  in  full  lengths,  should  be  so  specified, 
otherwise  lengths  convenient  for  packing  may  be  sent. 

Orders  for  assorted  tubing  above  25  mm  must  be  for  5  pounds  or  more;  orders  for  assorted  tub- 
ing from  13  to  25  mm  must  be  for  2  pounds  or  more;  from  3  to  12  mm  for  1  Ib.  or  more. 
Diam.  outside,  mm.        3       5       6       8     10     12     15     19     22     25     32     35     38     47     50 

Per  pound 80     .50     .50     .50    .50     .50     .50     .50     .50     .50     .60     .60     .80     .80     .80 

7192.  GLASS  TUBES,  Annealed  Ends.  Glass  tubes  of  large  diameter  are  not  satisfactory  unless  ends 
are  annealed  to  prevent  longitudinal  cracking.  We  list  below  a  few  sizes  but  can  supply  any 

size  desired.    No ABODE        FGH         JKLM 

Diameter  outside,  cm.     2.5      2.5      2.5      2.5      2.5      2.5         3         3         4         4         4         4 

Length,  em 30       60       75     100     120     150     100     120       45       60       90      100 

.60       .70      .70       .75       .80     1.10     1.20       .90     1.10     1.70     1.75 
PQBSTUVWXYZ 
4      4.5        555555555 
120      100       20        30        38        45        60        75        90      120      150 
1.85     2.50      .70     1.10     1.20     1.25     1.30     1.60     1.70     2.60     2.80 


Each 40 

No N 

Diameter  outside,  em.        4 

Length,   cm 110 

Each 1.80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


297 


No.  7194. 


No.  7200. 


No.  7202. 


No.  7206. 


No.  7230. 


No.  7232. 


No.  7234. 


No.  7242. 


7194. 

7196. 
7200. 

7202. 
7206. 


GLASS  TUBES,  Bomb,  for  Carius  and  other  explosion  furnaces,  of  heavy  soft  glass,  with  one 

end  closed.     Length,  60  cm;   diameter  outside,  25  mm $1.25 

Note: — Other  sizes  will  be  made  to  order. 

GLASS  TUBES.  Sealing,  of  heavy  soft  glass  with  constriction  for  sealing  off.     Length,  70  cm; 


diameter   outside.   25   mm 

GLASS  TUBING,  Barometer,  heavy  wall,  outside  diameter  from  6  to  10  mm. 

Diameter  of  bore,  mm 3 

Per  pound •. 80 

GLASS  TUBING,  Capillary,  from  5  to  7  mm  outside  diameter. 

Diameter   of  bore,   mm %  %  %  1          1% 

Per  pound 1.00        1.00         1.00         1.00         1.00 


4 
.80 


1.00 


1.40 

5 
.80 


7212. 

7220. 

7230. 
7232. 
7234. 

7240. 
7242. 


1.00 

GLASS  TUBING,  Combustion,  Pyrex,  of  the  same  composition  as  the  Pyrex  boiling  ware.     Its 
high  melting  point,  low  coefficient  of  expansion  and  resistance  to  mechanical  stresses,  make  it 
especially  adapted  for  combustion  work.     In  36  inch  lengths  only,  unless  specified  in  ordering, 
when  72  inch  lengths  may  be  had. 

Diameter,  inside,  mm  ........         4  6  8  10  12  15  18  21 

Thickness  of  wall,  mm  .......       1.2  1.2          1.2  1.2  1.5  1.5  2  2 

Per  pound   .................      1.00         1.00         1.00         1.20         1.20         1.20         1.50         1.50 

GLASS  TUBES,  Combustion,  see  Combustion  Tubes,  page  163. 
GLASS  TUBING,  Thermometer,  with  white  back,  6  to  7  mm  in  diameter  ........  Per  pound     $0.75 

GLASS  WOOL  for  filtering,  etc  ...............................................  Per  ounce         .50 

GLOBES,  Deflagrating,  see  Deflagrating  Globes.  Per  pound      6.00 

GLOVES,  Asbestos  Mittens,  11  inches  long. 

Size   ...................................................................  medium    large 

Per  pair  ................................................................       3.25        3.25 

GLOVES.  Asbestos,  Fingered,  11  inches  long. 

Size   ...................................................................   medium    large 

Per  pair  ................................................................       3.75        3.75 

GLOVES,  Asbestos,  Fingered,  same  as  No.  7232,  but  with  gauntlet  to  protect  wrists. 

Size   ...................................................................  medium    large 

Per  pair  ................................................................       4.25        4.25 

GLOVES,  Rubber,  black,  medium  weight  .....................................  per    pair        .75 

Sizes  6  to  in.     (Example:     Kid  Glove  No.  8  takes  Rubber  Glove  No.  10.) 

GLOVES,  Rubber,  tight  fitting,  made  of  thinnest  pure  gum,  as  used  by  surgeons  in  operating. 
Sizes  6  to  10  ..............................................................  per  pair     1.00 

Kindly  give  size  of  usual  kid  glove  in  ordering. 


298 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  7284. 


No.  7270. 


No.  7272. 


7246. 


GLOVES,  Rubber,  Acid  Gloves,  loose  fitting,  heavy,  gauntleted. 

Sizes  for  women,  6  to  9 

Sizes  for  men,  10  to  12 

7264.  GLUE,  Le  Page's. 

Bottle 


per  pair   $2.50 
per  pair     2.50 


Can 


7256. 
7264. 

7270. 
7272. 
7274. 

7280. 
7284. 
7286. 
7288. 


Size    Small  Large  2  oz.  4  oz.  8  oz.  1  Ib. 

Each 15  .20  .25  .40  .60  1.00 

GLCTE,  Marine,  waterproof per  ounce  bottle       .25 

GLUE  TESTER,  Scott's,  for  comparing  tensile  strength  of  jelly,  glue,  etc.     Can  also  be  used 

for  grease,  waxes,  etc.     Eeads  in  pounds  and  fractions  of  ounces  up  to  3  pounds 25.00 

GOGGLES.  Rubber,  gas  tight,  with  clear  glasses  lined   with   mica  to   prevent   transmission   of 

heat     1.20 

GOGGLES,  Colored  Glass,  for  protecting  the  eyes,  mounted  in  metal  frame  with  soft  leather 

shields     40 

GOGGLES,  Blue  Glass,  called  Bessemer  glasses.    Widely  used  for  inspection  work  in  connection 

with  steel  furnaces,  cement  kilns,  etc 1-20 

GOLD  BEATER'S   SKIN,   6   inches   square 10 

GOLD  WASHING  HORN,  of  polished  copper,  9  inches  long 80 

GOLD  WASHING  PANS,  of  polished  steel.  16  inches  in  diameter;   2%  inches  deep 1.00 

PROTRACTOR  AND  GONIOMETER,  Penfield's.  A  graduated  semicircle  printed  on  a  heavy 
card,  with  an  arm  of  transparent  celluloid,  swiveled  on  an  eyelet  at  the  center  of  the  semicircle. 
A  fine  index  line  on  the  under  side  of  the  celluloid  arm  indicates  the  angle.  The  instrument 
is  also  an  accurate  goniometer  for  measuring  plane  angles.  The  millimeter  scale,  English 
diagonal  scale,  scales  for  lOths,  12ths,  and  16ths  of  inches,  and  graduation  of  the  semicircle  are 
all  engine  divided.  Each  instrument  placed  in  a  stout  manila  envelope  with  complete  printed 
instructions  by  Prof.  Penfield.  Dimensions  about  8x15  cm 60 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


299 


BBBBBBBBBfl 


EBBBBBBBBB 


BBBBBBBBBB 


No.  7322. 

7289.  CONTACT  GONIOMETER,  Penfield's  Model  A.      For  measuring  internal   angles  and  for  use 

where  an  arm  protractor  cannot  be  employed.     Consists  of  two  pairs  of  measuring  arms  with 
separate  protractor,  about  8x15  em $0.60 

7290.  CONTACT   GONIOMETER,   Penfield's  Model  B.      As  it  is  difficult  to  adjust  a  transparent  edge 

in  exact  contact  with  some  surfaces,  a  modified  form  of  No.  7288  is  made  for  measuring  crystals, 
having  the  celluloid  arm  opaque  for  a  portion  of  its  length.  Dimensions  about  6x10.5  cm.         .60 
For  other  PROTRACTORS,  see  Catalog  P  of  Physical  Apparatus. 
GRADUATES,  Cylindrical,  see  Cylinders,  Graduated. 
7292.    GRADUATES,  Glass,  Cone  Shape,  metric  measure. 

Capacity,  cc 30          60          100          200          250          500          1000 

Each..' 36         .40          .45  .60  .65          1.00          1.70 

7294.    GRADUATES,  Glass,  Cone  Shape,  metric  and  English  measure,  double  graduation. 

Capacity,  ounces 123  6  8  16  32 

Capacitv,  cc 30          60          100          200          250          500          1000 

Each  . ." 38          .50          .56  .76  .90          1.30          2.20 

7296.  GRADUATE,  Glass,  Cone  Shape,  new  form,  of  heat  resisting  glass,  permitting  the  use  of  hot 
liquids  with  minimum  danger  of  breakage.  The  graduations  are  on  the  inside,  being  produced 
in  such  a  way  as  to  render  them  mathematically  accurate.  As  the  marks  are  in  direct  eon- 
tact  with  the  liquid,  accurate  adjustments  are  easily  made.  Graduated  to  250  ce  and  to 

8    ounces -75 

GRADUATED  FUNNEL  for  Creosote,  see  Funnels. 

GRAIN  TESTING  APPARATUS 

BALANCES,  Grain  Testing,  see  general  heading  Balances. 

BALANCE  WEIGHTS,  see  Balances. 

BOTTLES,  Grain  Sample,  see  Nos.  1756  and  1758. 

7310.  GERMINATING  BOX  for  showing  proper  depth  to  plant  seeds.  Of  galvanized  iron  15  inches 
long  by  8  inches  high,  with  glass  front  and  back  %  of  an  inch  apart,  making  it  easy  to  ob- 
serve the  germination  of  seeds  planted  at  different  depths.  Complete  with  metal  shields  to 
exclude  light  from  the  sides.  (See  Farmer's  Bulletin  No.  218  of  the  United  States  Department 
of  Agriculture) 3.75 

7312.  GERMINATING  BOX,  Ganong  Pattern,  for  sprouting  and  observing  root  growths.  Light,  rust- 
proofed  metal  box  with  inclined  glass  front.  Dimensions,  7%  inches  long,  5  inches  deep,  59i 
inches  wide  at  the  top,  4  inches  wide  at  the  bottom .90 

7314.  GERMINATING  PLATE,  of  heavy  glazed  earthenware,  10  inches  in  diameter.  For  holding 
moist  blotting  paper  in  germination  experiments >.  .30 

7316.  GERMINATING  PLATE,  of  porous  clay,  9  inches  in  diameter.  Obviates  the  use  of  blotting  pa- 
per in  germination  experiments .24 

3592.  GERMINATING  PLATE,  of  porous  clay,  4^6  inches  in  diameter  by  7{6  inch  deep,  with  straight 
sides  20 


300 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


7320. 
7322. 


7324. 
7328. 


7330. 
7336. 

7338. 
552. 


7344. 
7346. 


No.  7330. 


No.  7324. 


No.  7346. 


GERMINATING  PLATE,  of  graniteware,  11  inches  in  diameter  by  1%  inches  deep.  For  use 
with  moist  blotting  paper  in  germination  experiments  $0.35 

GERMINATING  TRAY,  of  water-proofed  wood,  25x25x2%  inches  deep,  for  testing  fertility  of 
corn  and  other  grain.  A  frame  which  fits  into  the  tray  is  divided  into  144  squares-  which 
may  be  numbered  if  desired.  (For  illustration,  see  preceding  page) 5.50 

GERMINATING  TRAY,  of  wood,  18x10x2  inches   deep 2.00 

GERMINATION  OR  SPROUTING  APPARATUS,  Schoenjahn's  Patent,  for  quickly  determin- 
ing the  percentage  sprouting  value  of  barley,  showing  its  malting  quality.  Equally  efficient 
in  showing  sprouting  value  of  all  grains.  Capacity,  100  grains.  Complete  with  directions 
for  use 7-50 

GERMINATION  OR  SPROUTING  CUP,  as  described  in  Bulletin  No.  35  of  the  Rhode  Island 
Experiment  Station,  and  on  page  14  of  Bailey's  "Nursery  Book."  Of  porous  clay  3  inches 
in  diameter  by  1%  inches  high,  with  ventilated  cover  and  glass  dish 50 

GERMINATION  TESTER,  Sho-Gro,  oil  heated,  constructed  throughout  of  non-rustable  metal 
and  glass.  It  has  a  capacity  of  5  trays,  each  measuring  10x15  inches,  so  that  a  large  number 
of  samples  may  be  accommodated  at  one  time.  The  outside  measurements  over  all  are  32 
inches  high,  13  inches  wide,  and  17  inches  deep.  Since  all  sides  are  of  glass,  the  progress  of 
the  test  is  always  in  view.  Complete  with  24  blotters,  a  supply  of  dividing-  strips  and  oil 
lamp  for  heating 15.00 

GERMINATION  TESTER,  Sho-Gro,  same  as  No.  7336,  but  electrically  heated,  with  switch  for 
three  heats  23.00 

In  ordering,  kindly  state  voltage  of  circuit. 

GRAIN'  CONTAINER  of  galvanized  iron,  see  Bins  and  Containers. 

GRAIN  OR  SEED  SCALE  (Dirt  Scale),  for  ascertaining  the  percentage  of  dirt  in  grain  or 
seed.  The  beam  has  two  rows  of  marks,  the  upper  indicating  the  weight,  one  pound  by  quar- 
ter ounces;  the  lower  the  percentage  of  dirt.  In  use  a  sample  pound  is  weighed,  sifted,  and 
replaced  in  the  scoop.  The  poise  is  th*n  run  back  until  the  beam  balances.  The  lower  row  of 
marks  shows  the  percentage  of  loss  by  dirt  removed,  i.  e.,  the  percentage  of  dirt  contained  in 
the  seed.  Complete  with  brass  scoop 12.00 

GRAIN  TESTER,  Grobecker's,  of  nickeled  brass,  for  determining  rapidly  the  farinaceous  con- 
dition of  barley  and  malt.  Fifty  kernels  may  be  cut  through  at  a  time 9.00 

GRAIN  TESTERS,  of  best  construction,  highly  polished  and  lacquered.  When  the  cup  is  empty 
the  beam  balances  with  the  poise  set  at  zero.  Beam  has  three  rows  of  graduations  which 
indicate  the  number  of  pounds  per  bushel  of  sample,  the  exact  weight  of  sample,  and  the 
percentage  of  loss  in  cleaning. 

Capacity     1  pt.          1  qt.          2  qt. 

Each    18.00         20.00         22.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


301 


7347. 


7360. 
7362. 
7364. 


5698. 
5708. 

5704. 
7368. 
3662. 
3664. 


7371. 


7372. 


No.  7347. 


No.  7362  (including  No.  7374). 


GRAIN  TESTEE  TILLERS,  for  use  with  No.  7346  Grain  Testers.  This  device  is  of  special 
value  when  accurate  testing  is  desired,  since  it  allows  the  grain  to  flow  in  a  uniform  stream 
and  insures  a  uniform  density  in  the  cup.  Complete  with  polished  steel  rod  for  striking  off. 

Capacity,    quarts . .  1  2 

Each    $8.00       10.00 

Note: — The  above  fillers  may  be  used  with  any  grain  testers  of  capacity  equal  to  or  smaller  than 

that  of  the  filler. 

MAGNIFIERS,  for  Grain,  see  general  heading  Magnifiers. 

MOISTURE  TESTERS,  Official  Brown-Duvel,  developed  primarily  to  meet  the  needs  of  grain 
dealers  for  a  rapid  and  exact  method  of  determining  the  moisture  in  corn.  Methods  have  now 
been  worked  out  for  making  moisture  tests  of  the  more  important  cereal  grains  and  some  of 
the  more  important  seeds,  as  well  as  for  flour  and  ground  grain.  The  method  is  entirely  prac- 
ticable for  making  moisture  determinations  of  practically  all  substances  which  admit  of  a  free 
circulation  of  oil  during  the  heating.  The  apparatus  consists  of  a  heating  chamber  divided 
into  compartments  for  testing  a  number  of  samples  at  the  same  time;  a  cold  water  tank 
through  which  condenser  tubes  pass;  burners;  thermometers;  special  side  neck  flasks;  gradu- 
ated cylinders;  and  No.  7374  Automatic  Oil  Measuring  and  Grain  Separating  Device.  Testers 
B,  C  and  D  are  12%  inches  -wide  and  31  inches  high.  No.  A  is  especially  adapted  for  field 
work  and  is  put  up  in  a  carrying  case  11  by  7  by  15  inches;  weight  complete,  19  pounds. 
These  testers  are  the  standard  form  as  specified  in  Paragraph  11  of  the  Federal  Corn  Grades, 
effective  July  1,  1914.  (See  Bulletins  Nos.  56  and  99,  and  Circular  No.  72,  Bureau  of  Plant 
Industry,  United  States  Department  of  Agriculture.) 

No.       . A  B  C  D 

Number  of  compartments 1  2  4  6 

Length,  inches   6%  13  26  39 

With  gas  burners 27.00        40.00        55.00        70.00 

With  alcohol  burners 27.00         40.00         55.00         70.00 

With  electric  heaters 35.00        56.00        87.00       118.00 

Note: — In  ordering  No.  7364,  kindly  state  voltage  of  circuit. 

Parts  and  Accessories  for  Moisture  Testers. 

FLASK,  Pyrex  Glass,  1000  cc 1-50 

FLASK,  Copper,  single  wall,  1000  cc 3.00 

FLASK.  Copper,  double  wall,  inner  vessel  900  cc   6.00 

CONDENSER  TUBE,  of  glass 30 

GRADUATED  CYLINDERS,  25  cc,  graduated  in  %  cc 65 

GRADUATED  CYLINDER,  new  design;  for  use  when  50  gram  samples  are  being  tested.  With 
this  graduate  the  percentage  of  water  up  to  16  per  cent.,  is  given  by  direct  reading  without 

the  necessity  of  multiplying  by  two,  as  with  the  original  graduate 85 

OIL  for  moisture  testers, 'according  to  the  specifications  of  the  Bureau  of  Plant  Industry,  in 
metal  cans. 

No A 

Capacitv,  gallons 1 

Each    .'.. 90         3.25 

RUBBER  STOPPERS,  especially  designed  to  stand  the  high  temperature  existing  in  moisture 
test  flasks:  are  absolutely  necessary  when  copper  flasks  are  used. 

No 6 

Per   dozen..  1-65 


302 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  XT.  S.  A. 


7373. 
7374. 


7380. 


7382. 
7384. 
7386. 


No.  7402. 


No.  7398. 


7398. 
7402. 


7410. 
7412. 
7414. 
5732. 


THERMOMETER,  graduated  from  0°  to  200°  Centigrade,  specially  designed  for  moisture  test- 
ers    $2.00 

AUTOMATIC  OIL  MEASURING  AND  GRAIN  SEPARATING  DEVICE,  consisting  of  a  gal- 
vanized iron  tank,  re-enforced  strongly  with  brass,  and  so  mounted  on  brackets  that  it  can 
readily  be  attached  to  any  of  the  moisture  testers;  fitted  with  a  measuring  device  which 
automatically  measures  out  150  cc  of  oil  into  test  flask  by  merely  pushing  the  neck  of  the 
flask  upward  against  an  automatic  catch.  The  cover  of  the  tank  is  fitted  with  a  funnel- 
shaped  sieve,  which  catches  the  mixture  of  grain  and  oil  as  it  is  poured  from  the  flask  after 
the  test,  and  strains- the  oil  into  the  container  below.  In  this  way  the  oil  is  kept  free  from 

dust  and  dirt,  and  the  same  oil  may  be  used    repeatedly 5.00 

FANS,  Sample,  of  aluminum;  for  use  in  sampling  and  inspecting  grains,  with  one  end  formed 
into  a  spout  for  pouring  out  contents.  Strong,  light,  and  well  made;  will  not  rust  or  tar- 
nish; upward  pitch  of  spout  prevents  grain  from  rolling  out.  Recommended  in  Bulletin  No. 

99  of  the  Bureau  of  Plant  Industry.     Size   9x6x1%   inches each      1.40 

PROTEIN  DETERMINATION  APPARATUS  FOR  GRAIN,  see  general  heading,  Nitrogen  De- 
termination Apparatus. 

SAMPLER,  Bag,  for  sampling  small  seeds  in  sacks.    Diameter,  %2  inch;  length,  4%  inches  1.10 

SAMPLER,  Bag,  similar  to  No.  7382,  but  for  grains.   Diameter,  %  inch;  length,  6  inches.  . .  1.50 

SAMPLERS,  Grain,   consisting  of  two  polished  brass  tubes,  one  fitted  inside  of  the  other,  and 

having  openings  matching  each   other.     By  turning  the  handle,   the   inner  tube   is   revolved, 

thus  opening  and  closing  the  holes. 

No A 

Diameter,   inches 1*4 

Length,  inches 44 

Each    9.00 

SIEVE,  Corn  Test,  of  aluminum,  according  to  specifications  of  the  United  States  Department 
of  Agriculture,  consisting  of  one  sieve  with  i%4  inch  round  holes  and  one  bottom  pan,  nested, 

13  inches  in  diameter  by  3  inches  deep per    set      4.50 

SIEVES,  Wheat  Dockage,  according  to  Government  specifications,  consisting  of  a  set  of  four 
sieves,  13  inches  in  diameter,  and  bottom  pan,  constructed  of  aluminum,  telescoping.  Con- 
sists of  a  buckwheat  sieve  with  %4  inch  triangular  perforations;  a  fine  seed  sieve  with  i/j2 
inch  round  perforations;  a  scalper  sieve  with  i%4  inch  round  perforations;  and  a  chess  sieve 
with  perforations  4%/64  by  %  inch.  (See  Regulatory  Announcement  No.  22  of  Federal  Wheat 
Grades  effective  July  1  and  August  1,  1917) 8.00 

SPROUTING  MEDIA 

PROPAGATING  SAND,  best  quality,  clean  and  fertile per  peck 

SAWDUST,    for    germinating    trays,    specially  selected per  peck 

SPHAGNUM  MOSS,  best  quality,  for  germinating  boxes per  pound 

SULPHUR    DETERMINATION    APPARATUS,     for     determining     whether     grain     has 

bleached,  as  recommended  in  Circular  No.  Ill  of  the  United  States  Bureau  of  Plant  Industry. 
Consists  of  an  Erlenmeyer  flask  with  ground    in    stopper    and    connecting    tube.      Capacity, 

500  cc  1.95 

For  SEED  AND  GRAIN  SAMPLES  AND  TYPES,  send  for  Catalog  of  Agricultural  Apparatus. 


44 
12.00 


C 

1% 

52 

12.25 


.50 

.25 

.25 

been 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  a  A. 


303 


No.  7424. 


No.  7460. 


No.  7468. 


741:2. 


7424. 


14S8. 

--   •'. 


746S. 


74^4. 


For  GOUGES  see  Chisels. 

GRINDSTONES.     Selected  Berea  grindstones,  rubbed  smooth,  mounted  in  a  east  iron  trough,  with 
pressed  steel  base,  steel  shaft  and  steel  ball  bearings.     Shipped  knocked  down. 

Diameter,  inches 6  10 

Each $2.90  3.60 

GRINDER,  with  clamp  for  fastening  to  table  2  inches  thick  or  less.    High  quality  abrasive  wheel 
4  inches  in  diameter,  1  inch  face;  gears  enclosed  for  protection '. 7.00 

HACK-SAWS,  see  Saws. 

HAEMATOLOGY  APPARATUS,   see  Blood  Testing  Apparatus. 

HAMMERS,  of  cast  steel,  wedge  shaped,  for  breaking  ores. 

Xo A  B 

Weight,  ounces 7  16 

Each 85  1.00 

HAMMER.  Blowpipe,  Planner's,  with  wooden  handle 45 

HAMMERS,  Claw,  cast  steeL 

No A  B 

Weight,  ounces 7  •  13 

Each -. 1.15  1-25 

HAMMER,  Prospecting  Pick,  of  cast  steel,  square  head  with  flat  face.      Pick  point  of  hardened 

steel.     Weight  I1*  pounds 24JO 

HAND  TALLY,  see  Counter  No.  3318. 

HARDNESS  TESTERS 

For  a  full  discussion  of  methods  of  measuring  hardness  of  metals,  see  Technologic  Paper  No.  11 
of  the  United  States  Bureau  of  Standards. 

HARDNESS  TESTER.  Brinell  Ball  Type,  for  maximum  pressure  of  3,000  kilograms,  for  deter- 
mining comparative  hardness  by  the  Brinell  ball  indentation  methodl  This  instrument  is  con- 
sidered the  standard  for  hardness  tests  and  is  widely  used  by  steel  manufacturers  and  users 
throughout  the  world.  The  machine  is  of  the  hydraulic  type,  using  glycerine  as  the  pressure 
medium.  The  press  is  so  constructed  that  no  air  can  leak  in  behind  the  plunger.  A  special 
feature  of  this  method  is  the  automatic  depth  gage  by  which  the  depth  of  tte  indentation 
may  be  read  directly  without  calculation  and  the  corresponding  Brinell  number  obtained  from 
a  table  supplied  with  each  machine.  Shipping  weight.  700  pounds.  Complete  as  described, 
filled  with  glycerine,  but  without  Automatic  Depth  Gage 315.00 


304 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


7485. 


7486. 


7487. 


7492. 


7494. 
7495. 


No.  7485. 


No.  7486. 


No.  7487. 


No.  7492. 


AUTOMATIC  DEPTH  GAGE  for  reading  directly  in  hundredths  of  a  mm  the  depth  of  indenta- 
tion of  the  Brinell  sphere.  The  depth  of  the  indentation  has  been  shown  by  the  United  States 
Bureau  of  Standards  to  be  the  correct  method  of  comparing  the  hardness  of  metals.  The 
total  scale  of  150  represents  an  indentation  of  I1/-;  mm.  Complete  in  leather  covered  case.  .$65.00 

MICROMETER  MICROSCOPE  for  use  with  No.  7484  Hardness  Tester  for  those  who  wish  to 
measure  the  diameter  of  indentation.  Reads  directly  in  mm  to  an  accuracy  of  0.001  mm. 
Height  of  support,  12  inches;  length  of  side  arm,  8  inches.  Complete  with  achromatic  ob- 
jective of  42  mm  focus,  ocular  with  stationary  cross  hairs,  rack-and-pinion  movement  for 
focusing  and  graduated  micrometer  screw  for  lateral  motion  mounted  on  heavy  support  with 
universal  adjustment 65.00 

BRINELL  MAGNIFIER,  hand  type,  for  reading  approximately  the  diameter  of  the  indentation. 
Consists  of  a  magnifying  lens  and  a  small  steel  rule  graduated  in  fifths  of  a  mm.  Readings 
can  be  made  to  ^0  mm 10.00 

HARDNESS  TESTER,  Brinell  Meter,  a  portable  instrument  for  determining  the  hardness  of 
metals  by  comparing  the  diameters  of  the  depressions  produced  in  the  test  piece  and  a  stand- 
ard piece  of  known  hardness,  by  a  sphere  under  the  influence  of  the  same  force.  The  ad- 
vantages of  such  an  instrument  over  other  types  are  its  portability,  unlimited  range  of  appli- 
cation, rugged  construction  and  convenience  in  operation.  Complete  with  one  Brinell  Meter, 
12  standard  10mm  balls,  6  standard  bars  of  carefully  determined  Brinell  hardness,  2  special 
scales  for  measuring  the  diameter  of  indentation,  key  for  opening  instrument  and  a  set  of 
direct-reading  tables,  with  instructions  for  use,  in  leather  covered  carrying  case,  9x6  inches; 
total  carrying  weight,  6^  pounds.  (Unless  specified,  3  bars  of  hardness  170  Brinell  and  3  of 

250  Brinell  will  be  sent.)    Descriptive  booklet  will  be  sent  upon  request 55.00 

7493.     STANDARD  BARS  for  No.   7492 each        .75 

(In  ordering,  specify  degree  of  hardness  desired,  and  give  serial  number  of  instrument  with 
which  they  are  to  be  used.) 

STANDARD  STEEL  BALLS  for  No.  7492,  exactly  10  mm  in  diameter per  9ozen     1.00 

MEASURING  SCALES  for  No.  7492,  graduated  to  %0  mm,  for  reading  to  140  mm- 

No •. A  B 

Beading,    mm 1.5  to  3.5     3  to  5 

Each    15  .15 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


305 


No.  7498. 


No.  7498. 


Nos.  7508-9. 


7498.  HARDNESS  TESTEE.  Scleroscope,  Shore's,  for  determining  the  comparative  hardness  of  metals. 
The  method  consists  in  dropping  a  small  hammer  from  a  fixed  height  upon  the  piece  being 
tested,  and  measuring  the  height  of  the  rebound  upon  the  scale,  which  reads  directly  in  de- 
grees of  hardness.  Complete  with  Scleroscope,  plastermount  vessel,  stand  with  swinging 
arm,  magnifier,  hammer  for  soft  metals,  one  each  brass  and  hard  steel,  calibrated  reference 
bars,  and  50  blank  curve  charts  in  polished  wood  carrying  case.  Descriptive  booklet  sent 

upon  request $170.00 

HARDNESS  SCALE,  see  Blowpipe  Apparatus. 

7500.    HATCHET,  high  grade  steel,  black  finish,  polished  face  and  bevel,  selected  white  hickory  handle, 

3%  inch  bit 1.25 

HEAT  GAGES,  see  Pyrometers. 

HEATEES,  Electric,  for  Extraction  Apparatus,  see  Extraction  Apparatus  Heaters,  Nos.  5260  to 


HEATERS.  Electric,  for  ether  extractions,  Kjeldahl  digestions,  etc.  Consists  of  six  electric  hot 
plates.  3^  inches  in  diameter,  mounted  on  a  sheet  iron  box.  Each  heater  has  its  own  switch, 
enabling  any  number  to  be  used  at  a  time.  Lenth,  24  inches;  width,  5*4  inches;  height,  9 
inches.  Complete  with  rack  for  Kjeldahl  flasks,  and  with  connecting  cord  and  plug. 


7508. 
7509. 


No 

Number  of  hot  plates. 

Length,  inches   

For  110  volts 

For  220  volts. . 


A 

6 

24 

57.75 
57.75 


B 

10 
40 

90.75 
90.75 


7512.  HEATER,  Cenco  Electric,  for  Volatile  Fluids,  designed  by  W.  H.  Ross,  consisting  of  a  box 
80x20x12  cm  of  asbestos  board  containing  a  system  of  resistance  coils,  above  which  is  sup- 
ported a  sheet  iron  pan.  The  top  of  the  outer  box  is  removable  and  has  openings  for  flasks 
which  rest  on  the  bottom  of  the  iron  pan  below.  A  switch  arrangement  permits  the  use  of 
currents  of  from  1  to  4  amperes  at  110  volts,  the  change  from  minimum  to  maximum  being 
made  in  nine  steps  if  desired.  With  top  removed,  the  heater  becomes  an  ordinary  hot  plate. 
By  placing  a  liquid  in  the  iron  box  the  heater  becomes  a  liquid  bath.  Complete  with  covers 
for  holes  . ,  37.50 


306 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  7520.  !»       No.  7514.  No.  7518. 

7514.  HEATERS,  Electric  Combination  Flask,  Sand  Bath,  and  Hot  Plate.     Constructed  with  replace- 

able unit,  and  with  housing  of  heavy  sheet  steel  containing  rheostat  for  temperature  control. 
Upper  part  of  casing  is  flanged  to  form  slide  for  several  appliances.  Maximum  temperature 
obtainable,  540°C.  (1000°F.),  which  can  be  controlled  sufficiently  low  for  ether  extractions. 
Complete  with  Hot  Plate  Slide,  8x9  inches;  Flask  Heater  Attachment,  6x3%  inches;  two 
Sand  Bath  Attachments,  4  and  6  inches  by  3%  inches  deep;  and  with  connecting  cord  and 

plug.      No A  B 

For  volts 110  220 

Each    $42.50        42.50 

7515.  EXTRA  HEATING  UNITS  for  No.  7514 4.00  4.00 

7518.     HEATERS.  Electric  Immersion  Coils,  for  heating    water    baths,    thermostats,    etc.,    with    three 

heats.     Complete  with  five-foot  cord  and  regulating  switch.     May  be  used  on   either  AC    or 

B.C.     No A  B  C 

Diameter  of  coil,  inches 6%  81/^  11 

Depth  of  coil,  inches 3  4  4% 

Height  from  bottom  of  coil  to  bottom  of  handle,  inches 9  13  18 

Minimum  power  consumption,  watts 110  275  500 

Maximum  power  consumption,  watts 440  1100          2000 

Each    15.50         22.00         33.00 

In  ordering,  kindly  state  voltage. 

7520.  HEATERS,  Electric  Immersion,  Cylindrical  form,  made  of  copper  and  brass,  nickel-plated. 
Diameter  of  cylinder,  %  inch;  length  of  heater,  7  inches;  weight,  %  pound;  power  eon- 
sumption,  350  watts.  Complete  with  connecting  cord,  attachment  plug  and  special  switch- 
plug.  No A  B 

For  volts 110          220 

Each    4.50        5.50 

7522.  HEATERS,  Electric  Immersion,  Portable  Disk  Type,  for  use  in  water  baths,  paraffine  baths, 
etc.;  made  of  non-corrosive  metal  throughout.  Complete  with  six  feet  of  connector  cord, 
separable  attachment  plug,  connection  plug  and  through  switch.  For  110  volt  circuit  only. 

No A  B  C 

Diameter  of  disk,  inches 3  4  5 

Length  of  handle,  inches 7%          8%  9 

Power  consumption,  watts 250          425          660 

Number  of  heats 1  3  3 

Shipping  weight,  pounds 2  3  4 

Each    6.00        9.00        9.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


307 


Nos.  7526-7. 


Nos.  7524-5. 


Nos.  7536-40. 

HEATERS,  Electric  Immersion,  DeKhotinsky,  for  use  in  water  baths,  incubators,  etc.,  consist- 
ing of  two  units,  contained  in  non-corrosive  metal  tubes,  connected  in  parallel.  Unless  speci- 
fied in  ordering,  230  watt  heater  containing  two  115  watt  units  will  be  sent.  Selection  may 
be  made  from  the  list  of  units  given  under  Nos.  7526  and  7527. 

No A  B  C  D 

Length  of  heater  tubes,  inches 8  12  18  24 

For  110  volts $12.00         12.50         13.00         13.50 

For  220  volts 13.00         13.50         14.00         14.50 


7524. 
7525. 


7526. 
7527. 
7528. 


7536. 

7538. 
7540. 
7542. 


UNITS,  DeKhotinsky  Standard  Heating,  for  use  in  Nos.  7524  and  7525  Electric  Heaters,  of 
Chromel  wire  wound  on  lavite.  They  can  be  easily  installed,  requiring  only  a  screw  driver 
for  removal  and  insertion. 

No A  B  C  D  E 

Wattage 44  60  75          115          140 

For  110  volts 1.00        1.00        1.00        1.00        1.00 

For  220  volts 1.25        1.25        1.25        1.25        1.25 

HEATER,  Despatch  Flexible  Electric,  very  convenient  for  use  in  the  laboratory  as  its  flexibil- 
ity permits  it  to  be  wrapped  about  a  bottle,  beaker  or  other  object  to  be  heated.  Thoroughly 
insulated  and  safe  to  handle.  Length  unrolled,  16  inches;  width,  3%  inches;  thickness,  % 
inch ;  current  consumption,  300  watts.  For  110  volts  only 7.00 

HEATERS,  Flask,  sheet  iron,  see  Flask  Heaters. 

HEATER,  Instantaneous  Water.  Gives  hot  water  in  three  seconds  after  the  gas  is  lighted,  and 
in  one  minute  will  give  sufficient  hot  water  for  washing  hands.  Total  height,  9  inches;  gas 
supply  required,  %  inch  clear  bore  pipe  and  tap;  maximum  gas  consumption  60  cubic  feet  per 
hour.  Illustration  shows  the  heater  on  No.  2082  Burner.  Heater  complete,  without  burner  7.00 

HEATER,  Instantaneous  Water,  same  as  No.  7536,  but  with  Burner  No.  2082  for  illuminating 
gas  9.00 

HEATER,  Instantaneous  Water,  same  as  No.  7536,  but  with  Burner  No.  2084  for  gasoline 
gas  10.40 

HEATER,  Instantaneous  Water,  specially  designed  for  lavatory,  general  laboratory  and  domestic 
use;  it  will  heat  one  pint  of  water  per  minute  from  50°F.  to  130°F.  or  will  boil  4  gallons  per 
hour.  A  pilot  light  attachment  keeps  the  water  in  the  coil  constantly  warm  when  the  water 
is  not  running  and  automatically  lights  the  burner  when  the  gas  is  turned  on.  Height  over 


308 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  7562  (in  use).  No.  7556. 


A          No.  7558.  B 


No.  7572. 


No.  7570. 


all,  18  inches;  projection  from  wall,  6  inches;   gas  supply  required,    %   inch   clear  bore  pipe; 
maximum  consumption  per  hour,  20  cubic  feet  of  gas.     Complete  with  coupled  taps  and  pilot 

light    $33.00 

7544.    HEATEK,  Instantaneous  Water,  same  as  No.    7542,   but   equipped   with   burner    for    gasoline 

gas     34.00 

7546.  HEATER,  Instantaneous  Water,  similar  to  7542,  but  larger  with  twice  the  capacity.  Height 
over  all,  19  inches;  projection  from  wall,  8  inches;  gas  supply  required,  %  inch  clear  bore 
pipe;  maximum  consumption  per  hour,  40  cubic  feet  of  gas.  Complete  with  coupled  taps  and, 

pilot  light   39.00 

7548.    HEATER,  Instantaneous  Water,  same  as  No.    7546,    but    equipped    with    burner    for    gasoline 

gas     40.00 

HONES,  see  Microtome  Accessories. 
HOSE,  Rubber,  see  Rubber  Tubing. 
7556.    HOSE  CONNECTOR,  brass,  for  rubber  tubing,  with  thread  for  ordinary  hydrant  or  kitchen  bib. 

70 

7558.     HOSE  CONNECTORS,  brass,  for  smooth  faucets.    For  %  inch  faucet. 

No A  B 

Each   65          .65 

7560.    HOSE  CONNECTORS,  brass,  same  as  No.  7558,  for  %  inch  faucet. 

No A  B 

Each   75          .75 

7562.  HOSE  CONNECTOR,  Universal,  not  threaded,  but  merely  slipped  on  a  faucet  and  fastened  with 
a  chain.  Can  be  quickly  attached  to  any  water  faucet.  The  simplest  device  for  attaching  filter 
pumps,  stills,  water  motors,  turbines  and  centrifuges  to  a  common  faucet.  It  is  practical,  self- 
tightening  and  air  tight 2.00 

7570.  HOT  PLATES,  Electric,  round  form,  three  heat,  mounted  on  enameled  slate  base  with  regulating 
switch  and  furnished  with  six  feet  of  cord,  but  without  lamp  socket  plug  except  Nos.  A  and  B. 
May  be  used  on  either  alternating  or  direct  current  circuits. 

No A  B  C  D  E 

Diameter,  inches 4%  6  8  10  12 

Power  consumption,  minimum  watts 83  150  250  275  325 

Power  consumption,  maximum  watts 250  440  735  1100          1300 

Each    6.50  9.00          14.00         20.00         28.00 

In  ordering  kindly  state  voltage. 

7572.  HOT  PLATES,  Electric,  rectangular  form,  three  heat,  with  4  feet  of  cord  but  without  lamp 
socket  plug.  Nos.  A  and  B  have  three  plug  switches;  C  and  D  have  snap  switches. 

No A               B               C  D 

Size,   inches  . 9x12         12x18       18x24  4%x24 

Power  consumption,  minimum  watts 300            550           1000  150 

Power  consumption,  maximum  watts 880           1550          2800  600 

Each   22.00        29.00        50.00  16.00 

In  ordering  kindly  state  voltage. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


309 


7578. 


7580. 


7582. 


7589. 


7592. 


No.  7592. 


No.  7582. 


7593. 


HOT  PLATE,  Electric,  Grid  Type,  three  heat,  with  heating  surface  10%xlO%  inches;  height  of 
plate,  4%  inches.  A  greater  amount  of  heat  may  be  obtained  from  this  plate  than  from  other 
forms,  as  the  heating  unit  is  in  the  open  and  direct  radiation  is  obtained.  Provided  with  switch 
giving  three  heats,  consuming  220,  440  and  880  watts;  finished  in  nickel-plate.  Shipping 
weight,  17  pounds.  Complete  with  7  feet  of  connecting  cord  and  attachment  plug. 

No A  B 

For  volts 110  220 

Each    $10.00       10.00 

HOT  PLATE,  Electric,  Grid  Type,  similar  to  No.  7578,  but  with  two  burners,  giving  heating 
surface  10x20  inches;  each  burner  has  a  separate  three  heat  switch.  Current  consumption  with 
left  hand  burner,  220,  440  and  880  watts;  with  right  hand  burner,  375,  750  and  1500  watts. 
Height  of  plate,  5%  inches;  shipping  weight,  35  pounds.  • 

No A  B 

For  volts 110  220 

Each    22.50        22.50 

HOT  PLATE,  Electric,  Grid  Type,  similar  to  No.  7578,  but  with  three  burners  giving  a  heat- 
ing surface  14x32%  inches.  Each  burner  has  a  separate  three-heat  switch.  Current  eon- 
sumption  with  left  hand  burner,  125,  250  and  500  watts;  with  center  burner,  275,  550  and 
1100  watts;  with  right  hand  burner  375,  750  and  1500  watts.  Height  of  plate,  5%  inches; 
shipping  weight,  50  pounds. 

No A  B 

For  volts 110  220 

Each    32.50        32.5C 

HOT  PLATE,  Electric,  Hoskins  Type  MA-101,  for  use  on  either  A.C.  or  D.C.,  with  heating  ele- 
ments of  Chromel  wire  guaranteed  to  last  one  year.  With  top  of  pressed  steel,  heavy  bent 
wire  legs,  and  spiral  resistance  unit.  Heat  distribution  uniform  over  top.  Very  useful  for 
evaporating  solutions,  drying  precipitates,  etc.  Boils  one  liter  of  water  from  cold  in  15  min- 
utes. Diameter,  6  inches;  power  consumption,  500  watts;  maximum  temperature,  483°C.  or 
900°F.  Complete  with  6  feet  of  flexible  cord  and  separable  attachment  plug. 

No 

For  volts   

Each    

EXTRA  HEATING  UNITS  for  No.  7578. 

No 

Each 

HOT  PLATES,  Electric,  Hoskins  Type  MA-111,  for  use  on  either  A.C.  or  D.C. 

12x12  inches.  Requires  only  5  amperes  at  110  volts  and  2%  amperes  at  220  volts.  Heated 
at  center,  covering  area  5%  inches  in  diameter.  Will  boil  one  liter  of  water  placed  in  the 
center  from  cold  in  1  hour  and  15  minutes.  The  cooler  section  around  the  center  is  use- 
ful for  slowly  evaporating  to  dryness  contents  of  beakers,  etc.  Maximum  temperature  at 
center,  260°C.  (500°F.);  at  edge,  1219C.  (250°F.);  power  consumption,  500  watts.  Complete 
with  6  feet  of  twin-conductor  flexible  cord  with  separable  attachment  plug. 

No A  B 

For  volts 110  220 

Each    12.00        12.00 

EXTRA  HEATING  UNITS  for  No.  7592 each       3.00  3.00 


A 
110 
8.00 


B 

220 
8.00 


A  B 

3.00  3.00 

Size  of  plate, 


310 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


7596. 


No.  7596. 


No.  7602. 


No.  7610. 


HOT  PLATE,  Electric,  Hoskins  Three  Heat,  for  variable  temperatures.  Three  heats  are  ob- 
tainable from  parallel  windings,  each  controlled  by  a  snap  switch  on  the  front.  High  heat 
boils  one  liter  of  water  from  cold  in  20  minutes.  Size  of  hot  plate,  12x18  inches;  maximum 
temperature  on  low  heat  246°C.  (475°F.) ;  on  medium  heat,  315°C.  (600°F.) ;  on  high  heat, 
400°C.  (750°F.);  power  consumption  on  low  heat,  600  watts;  on  medium  heat,  1200  watts; 
on  high  heat,  1800  watts.  Mounted  on  four  square  steel  legs  with  polished  steel  top,  com- 
plete with  6  feet  twin-conductor  flexible  cord  and  separable  attachment  plug. 

No. A  B 

For  volts 110     220 

Each  .  $40-00    *°-00 


7597.     EXTEA  HEATING  UNITS  for  No.  7596 each     10.00 


10.00 


7602.  HOT  PLATES,  Electric,  Multiple  Unit  Type,  with  replaceable  units.    Can  be  used  interchange- 

ably on  110  and  220  volts.  The  method  of  construction  forces  heat  to  the  top,  providing  a 
higher  temperature  than  is  usually  attained  with  hot  plates  without  increased  current  con- 
sumptiem.  By  shifting  connections  at  the  rear  from  the  110  volt  to  the  220  volt  pins,  the  num- 
ber of  heats  obtained  on  110  volts  is  doubled.  All  sizes  give  a  maximum  temperature  of 
approximately  750°F.  (400°C.);  on  medium  heat,  600°F.  (315°C.);  on  low  heat,  400°F. 
(205°C.)  Made  of  cast  iron  with  removable  cast  iron  tops.  Bases  are  finished  in  optical 
black. 

No 10  12  22  32  40 

Size,    inches 12Vtxl2i/i   12%xl2%     18x12*4         24x18          6%xl8 

Shipping   weight,   pounds 50  51  80  135  45 

Number  of  heats 1  3  3  3  3 

Power  consumption  on  low  heat,  watts 352  520  1070  285 

Power  consumption  on  med.  heat,  watts 704  1030  2140  570 

Power  consumption  on  high  heat,   watts..      1056  1056  1550  3200  860 

Each    26.50  30.00  40.00  67.50  25.00 

7603.  EXTEA  HEATING  UNITS  for  No.  7602. 

Number  required 2  2  2  2  4 

Each    4.00  4.00  5.50  5.50  3.50 

7610.  HOT  PLATES  or  Drying  Tables,  for  use  with  gas.  The  top  is  of  one  piece  of  steel,  with  pol- 
ished surface;  the  legs  and  frame  are  of  cast  iron.  Flame  easily  regulated  Gives  an  even 
temperature. 

No , A  B  C 

Size  of  plates,  inches 10x18%     14%xl8%  18%x25V> 

Number  of  burners 1  3  3 

Eacn    12.50  16.25  26.25 

7612.    HOT  PLATES,  same  as  No.  7610,  but  for  use  with  gasoline  gas. 

No A  B  C 

Size  of  plate,  inches 10x18%     14%xl8%  18%x25V, 

Each    17.50  23.35  35.00 

HOUE  GLASSES,  see  Sand  Glasses. 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


311 


HYDROMETERS 
HYDROMETERS  FOR  GENERAL  USE 


PLAIN  HYDROMETER.   Regular  size,  about  12  inches  long.  Four-ounce  size,  about  5  inches  long. 


THERMO-HYDROMETER.   Regular  size,  about  14  inches  long.  Four-ounce  size,  about  7  inches  long. 


71)24. 
7(526. 

7628. 
7632. 

7634. 
7636. 
7640. 


7641. 
7642. 


HYDROMETERS,  Baume,  for  heavy  liquids,  highest  quality,  graduated  in 
about  11  inches. 

No  ................................      A  B  C  D  E 

Range,    degrees   Bauine  ..............     0-10      10-20       20-30       30-40       40-50 

Each  ...............................   $2.50        2.50         2.50         2.50 

HYDROMETERS,  Bauine,  for  heavy  liquids,  highest  quality,  graduated  in 
about  11  inches. 

No  .............................................................        A  B  C 

Range,    degrees   Baume  ..................  .  ........................     0-25        25-50       50-70 

Each    ...........................................................     2.00         2.00        2.00 

HYDROMETERS.  Baume,  for  heavy  liquids,  highest  quality,  graduated  in  %°  divisions.  Length 


divisions.  Length 

F  G 

50-60      60-70 
2.50         2.50         2.50 
°  divisions.  Length 


about  11  inches. 
No. 


Range,   degrees   Baume 0-35 


Each 


1.65 


B 

35-70 
1.65 
in   1° 
.50 
Length, 


HYDROMETER,   Baume,   for  heavy  liquids,  medium  grade,   graduated  from  0°   to   70 

divisions.     Length  about  11  inches 

HYDROMETERS,  Baume.  for  light  liquids,  highest  quality,  graduated  in  ifo'  divisions, 
about  11  inches. 

No A  B  C  D  E  F  G  H 

Range,  degrees   Baume 90-80       80-70        70-60       60-50       50-40       40-30       30-20       20-10 

Each     3.30        3.00  2.50         2.50         2.50         2.50         2.50         2.50 

HYDROMETER,  Baume,  for  light  liquids,  highest  quality,  graduated  from  40°   to  10"  in  %" 

divisions.    Length,  about  11  inches 1.65 

HYDROMETER,  Baume,  for  light  liquids,  medium  grade,  graduated  from  100°  to  10°  in   1° 

divisions.     Length,   about  11   inches 50 

HYDROMETERS,  Specific  Gravity  Scale,  standard,  for  scientific  work  requiring  highest  degree 
of  accuracy.     Graduated  at  60°F.,  in  0.001  divisions;  mercury  weighted.     Length,  about 
inches.     Each  hydrometer  lettered  as  below 


A  700  to 

B  760  to 

C  820  to 

D  .  880  to 


.760 
.820 
.880 
.940 

E    940  to  1.000 

F    1.000  to  1.060 

G    1.060  to  1.120 

H    1.120  to  1.180 

I  .    1.180  to  1.240 


K  1.300  to  1.360 

L  1,360  to  1.420 

M  1.420  to  1.480 

N  1.480  to  1.540 

O  1.540  to  1.600 

P  1.600  to  1.660 

Q  1.660  to  1.720 

R  1.720  to  1.780 

S  1.780  to  1.850 


J     1.240  to  1.300 

Set  of  19  hydrometers  listed  above,  complete  with  a  special  12-inch  floating  hydrometer,  with 
thermometer  scale  in  stem  reading  from  30"  to  120°F.,  in  1°  graduations.  The  special  hydro- 
meter is  marked  with  letters  indicating  which  spindle  to  use.  Set  complete  in  wooden 

case   109.00 

HYDROMETERS,  single  spindles  only  of  No.   7640 each      5.00 

HYDROMETERS,  Specific  Gravity  Scale,  for  heavy  liquids,  highest  quality,  graduated  in  0.002 
divisions.  Length,  about  11  inches. 

No A  B  C  D  E 

Kange    1.000-1.100     1.100-1.200     1.200-1.300     1.300-1.400     1.400-1.500 

Each     3.00  3.00  3.00  3.00  3.00 

No F  G  H  J  K 

Range    1.500-1.600     1.600-1.700     1.700-1.800     1.800-1.900     1.900-2.000 

Each     3.00  3.00  3.00  3.50  3.50 


312  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


No.  7660. 

7644.  HYDROMETERS,  Specific  Gravity  Scale,  for  heavy  liquids,  medium  grade,  graduated  in  0.005 
divisions.  Length,  about  11  inches. 

No A  B  C  D  E 

Eange,  gravity 1.000-1.200     1.200-1.400     1.400-1.600     1.600-1.800     1.800-2.000 

Each $0.75  .75  .75  .75  1.00 

7646.  HYDROMETER,  Specific  Gravity  Scale,  for  heavy  liquids,  medium  grade,  graduated  from  1.000 
to  2.000  in  0.01  divisions.  Length,  about  11  inches  50 

7C51.  HYDROMETERS,  Specific  Gravity  Scale,  for  light  liquids,  highest  quality,  graduated  in  0.002 
divisions.  Length,  about  11  inches. 

No A  B                    C                    D 

Range,    0.600-0.700  0.700-0.800     0.800-0.900     0.900-1.000 

Each    2.75  2.50                 2.50                 2.50 

7652.  HYDROMETERS,  Specific  Gravity  Scale,  for  light  liquids,  medium  grade,  graduated  in  0.002 
divisions.  Length,  about  11  inches. 

No A  B  C  D 

Range,    gravity 0.600-0.700  0.700-0.800     0.800-0.900     0.900-1.000 

Each    75  .75  .75  .75 

7654.  HYDROMETER,  Special  Gravity  Scale,  for  light  liquids,  medium  grade,  graduated  from  0.700- 
1.000  in  0.005  divisions.  Length,  about  11  inches 50 

7658.  HYDROMETER,  Combined  Baume  and  Specific  Gravity  Scales,  for  heavy  liquids,  ordinary  grade, 
graduated  from  0°  to  70°  Baume  in  1"  divisions,  and  from  1.000  to  2.000  specific  gravity  in 
0.01  divisions.  Length,  about  11  inches 45 

7660.  HYDROMETER,  Combined  Baume  and  Specific  Gravity  Scales,  for  light  liquids,  ordinary  grade, 
graduated  from  100°  to  10°  Baume  in  1°  divisions,  and  from  0.600  to  1.000  specific  gravity  in 
0.005  divisions.  Length,  about  11  inches 45 

7664.  HYDROMETER,  Universal,  Combined  Baum6  and  Specific  Gravity  Scales  for  light  and  heavy 
liquids,  medium  grade,  graduated  from  100°  to  10°  and  0°  to  70°  Baume.  in  1°  divisions;  from 
0.700  to  1.000  in  0.005  divisions,  and  1.000  to  2.000  in  0.01  divisions.  Length,  about  15 
inches  1.25 

HYDROMETERS  FOR  SPECIAL  USES 

HYDROMETERS,  Acid,  see  Hydrometers,  Baume. 

7670.  HYDROMETER,  Acid.  Specific  Gravity  Scale,  medium  grade,  for  use  in  Babcock  Milk  test. 
Graduated  from  1.800  to  1.850  in  0.001  divisions.  Length,  6  inches 70 

7672.  HYDROMETER,  Actinometer  Scale,  ordinary  grade,  for  photographic  uses,  graduated  0°  to  80° 
in  1°  divisions.  Length,  5  inches.  Complete  with  test  jar  in  wooden  case 35 

7674.  HYDROMETERS,  Alcohol  or  Spirit,  United  States  Internal  Revenue,  Per  Cent,  of  Proof  Scale, 
highest  quality.  Length,  about  8%  inches. 

No A  B  C  D  E 

Kange,    degrees 0-100        80-120      100-140     130-170     160-200 

Graduated  in,  degrees 1  %  %  %  % 

Each 2.25  2.25  2.25  2.25  2.25 

7676.  HYDROMETER,  Alcohol  or  Spirit,  Per  Cent,  by  Volume  (Tralle)  Scale,  highest  quality.  Widely 
used  in  determining  percentage  of  alcohol  in  beer  according  to  the  requirements  of  the  Fed- 
eral government.  Graduated  from  0°  to  5°  in  ^0°  divisions.  Length,  8%  inches 5.00 

7678.  HYDROMETER,  Alcohol,  Proof  and  Tralle  Scales,  medium  grade,  graduated  from  100°  below 
to  100°  above  Proof,  and  from  0°  to  100°  Tralle  in  1°  divisions.  Length,  about  11  inches  .50 

7680.  HYDROMETER,  Alcohol,  United  States  Custom  House,  Proof  and  Tralle  Scales,  medium  grade, 
with  enclosed  thermometer.  Graduations  same  as  No.  7678.  Length,  about  18  inches.  With 
correction  scale 3.00 

7684.  HYDROMETER,  Alkali.  Baume  Scale,  medium  grade,  graduated  from  0°  to  60°  in  1°  divisions. 
Length,  about  11  inches .50 

7686.  HYDROMETER,  Ammonia,  Baume  Scale,  medium  grade,  graduated  from  10°  to  50°  in  %°  divi- 
sions. Length,  about  11  inches 50 

HYDROMETER,  Asphalt,  see  Nos.  379  and  380. 

7690.  HYDROMETER,  Barkometer  Scale,  for  tanning  liquids,  highest  quality,  with  enclosed  ther- 
mometer, graduated  from  0°  to  70°  (1,000  to  1.070  specific  gravity)  in  1°  divisions.  Length, 
13  inches  5.80 

7692.  HYDROMETER,  Barkometer  Scale,  for  tanning  liquids,  medium  grade,  graduated  from  0°  to 
65°  (1.000  to  1.065  specific  gravity)  in  1°  divisions.  Length,  about  11  inches 50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


313 


No.  7730. 


No.  7732. 


No.  7738. 

7C96.  H  Y  DROME  TEE,  Battery,  Specific  Gravity  Scale,  medium  grade,  flat  body,  graduated  from  1.050 
to  1.300  in  0.005  divisions.  Length,  7  inches  $0.90 

7698.  HYDROMETER,  Battery  Syringe  or  Chargometer,  Specific  Gravity  Scale,  ordinary  grade,  grad- 
uated from  1.1  to  1.3  in  0.005  divisions.  Length  of  hydrometer,  3%  inches;  length  over  all, 
11%  inches.  Complete  with  good  quality  rubber  bulb  and  glass  syringe  with  unbreakable 
flexible  rubber  tip 1.00 

7099.     HYDROMETER  only  for  No.  7698.     Length,  3%  inches 45 

7702.    HYDROMETER.  Beer,  Balling  Scale,  highest   quality   with   enclosed   thermometer,    graduated 

from  0°  to  24°  in  ^0°  divisions.     Length,  about  17  inches 5.80 

HYDROMETER,  Benzine,  see  Hydrometer,  Gasoline. 

7704.    HYDROMETER,  Calcium  Chloride  Salometer,   highest   quality,   for   specific   gravity   of   brine. 

Graduated  from  0°  to  120*  in  1°   divisions.    Length,  about  11  inches 1.65 

HYDROMETERS,  Condensed  Milk,  see  Nos.  7744  and  7746. 

7708.  HYDROMETERS,  Creosote,  Specific  Gravity  Scale,  highest  quality,  according  to  the  specifica- 
tions of  the  American  Society  for  Testing  Materials.  Graduated  to  read  at  15.5°C.  in  0.001 
divisions.  Length,  9  inches. 

No A  B 

Range,   gravity .*. 1.000-1.080     1.070-1.150 

Each   '. 3.65  3.65 

7651  B.  HYDROMETER,  Ether,  Specific  Gravity  Scale,  highest  quality,  graduated  from  0.700  to  0.800 
in  0.002  divisions.  Length,  about  11  inches 2.50 

7714.  HYDROMETER.  Gasoline.  Baume  Scale,  medium  grade,  graduated  from  40°  to  90°  in  1°  divi- 
sions. Length,  about  11  inches 50 

7716.  HYDROMETER,  Gasoline,  Baume  Scale,  medium  grade,  graduated  from  40°  to  90°  in  1°  divi- 
sions. Length,  5  inches.  Complete  with  test  jar  in  wooden  case 50 

For  other  GASOLINE  HYDROMETERS,  see  Hydrometers,  Oil. 

7720.  HYDROMETER,  Glue,  Baume  Scale,  highest  quality,  graduated  from  0°  to  35°  in  %°  divisions, 
for  use  at  150°F.  Length,  about  11  inches 1.65 

7724.  HYDROMETER,  Lime  Sulphur  (Li-Sul-Sprayometer) ,  Baume  and  Specific  Gravity  Scales,  me- 
dium grade,  New  York  and  Pennsylvania  pattern,  for  testing  lime-sulphur  wash  used  in  spray- 
ing. Graduated  from  0°  to  38°  Baume,  in  %°  divisions,  and  from  1.000  to  1.350  specific 
gravity  in  0.005  divisions 75 

7726.  HYDROMETER,  Lime  Sulphur,  same  as  No.  7724,  complete  with  12x2-inch  glass  jar  in  wooden 
ease  with  directions  for  use 1.00 

7730.  HYDROMETER,  Milk,  Lactometer  Scale,  ordinary  grade,  graduated  from  0°  to  120°  in  2°  divi- 
sions. Length,  about  11  inches .40 

7732.  HYDROMETER,  Milk,  Quevenne's  Lactodensimeter,  medium  grade,  with  enclosed  thermometer, 
graduated  from  14°  to  42°  (1.014  to  1.042  specific  gravity)  in  1°  divisions.  Length,  about  13 
inches  .  . 3.50 

7734.  HYDROMETER,  Milk,  Quevenne's  Lactodensimeter,  same  as  No.  7732,  but  without  enclosed  ther- 
mometer    .60 

7736.  HYDROMETER.  Milk,  Spence's  Lactometer,  New  York  State  Dairy  Commission  Pattern,  high- 
est quality,  with  enclosed  thermometer,  graduated  from  0°  to  120°  in  2°  divisions.  Length, 
about  12  inches.  With  correction  scale  and  certificate 5.80 

7738.  HYDROMETER,  Milk,  Spence's  Lactometer,  New  York  State  Dairy  Commission  Pattern,  medium 
grade,  with  enclosed  thermometer,  graduated  from  0°  to  120°  in  2°  divisions.  Length,  about 
12  inches.  With  correction  scale 3.50 

7740.  HYDROMETER,  Milk,  Lactometer,  TTnited  States  Department  of  Agriculture  Dairy  Division  Pat- 
tern, Specific  Gravity  Scale,  highest  quality,  graduated  from  24°  to  37°  (1.024  to  1.037  specific 
gravity)  in  J40°  divisions.  (See  Bulletin  134  of  the  Bureau  of  Animal  Industry,  United  States 
Department  of  Agriculture,  page  16.) 5.00 


314  CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  7754. 

7744.  HYDROMETER,  Condensed  Milk,  Baume  Scale,  highest  quality,  graduated  from  0°  to  15°  in 
l^o"  divisions.  Length,  about  11  inches $2.50 

7746.  HYDROMETER,  Condensed  Milk,  Specific  Gravity  Scale,  highest  quality,  graduated  from  1.040 
to  1.080  in  0.001  divisions,  for  use  at  142°F.  Length,  9  inches 2.50 

7750.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  4  ounce  size,  highest  quality,  with  enclosed  ther- 

mometer, with  scale  at  bottom  reading  from  20°  to  120°F.,  for  use  in  4  ounce  sample  bottles 
or  small  test  jar.  Length,  about  7  inches.  Graduated  in  1°  divisions  to  read  correct  gravity 
at  60°F. 

No / A  B 

Range,  degrees  BaumS 10-50         40-90 

Each    5.00          5.00 

7751.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  4  ounce  size,  same  as  No.  7750,  but  plain,  without 

enclosed  thermometer. 

No A  B 

Eange,  degrees  Baume 10-45  45-90 

Each    2.50  2.50 

7752.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  4  ounce  size,  same  as  No.  7750,  but  with  smaller 

ranges  and  finer  divisions  for  very  accurate  readings  when  small  samples  only  are  available. 

Graduated  in  i£°  divisions. 

No A  B  C  D  E  F  G  H 

Eange,  degrees  Baumei  10-21         19-31         29-41         39-51         49-61         59-71         69-81         79-91 
Each    5.60  5.60          5.60  5.60  5.60  5.60  5.60  5.60 

7753.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  4  ounce  size,  same  as  No.  7752,  but  plain,  without 

enclosed  thermometer. 

No A               B               C  D               E               F               G               H 

Bange,  degrees  Baumei  10-21         19-31         29-41  39-51         49-61         59-71         69-81         79-91 

Each    2.35           2.35          2.35  2.35           2.35           2.35           2.35           2.35 

7754.  HYDROMETER   POCKET   CARRYING   CASE,  of  nickel-plated  metal,  for  4-ounce  hydrometer. 

Complete  with  hydrometer  jar  and  flannel  cover  for  hydrometer 85 

7756.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  regular  size,  highest  quality,  with  enclosed  ther- 

mometer, with  scale  at  bottom  reading  from  20°  to  120°F.,  for  use  in  12  or  15-inch  hydro- 
meter jars.  Length,  about  14  inches.  Graduated  to  read  correct  gravity  at  60°F. 

No A               B  C 

Eange,  degrees  Baume; 10-100        10-45  45-90 

Graduated  to,  degrees 1              %  % 

Each    5.30           5.00  5.00 

7757.  HYDROMETERS.  Oil  Testing,  Baume  Scale,  regular  size,  same  as  No.  7756,  but  plain,  without 

enclosed  thermometer. 

No A  B  C 

Eange,  degrees  Baume 10-100        10-45         45-90 

Graduated  to,  degrees 1  %  \b 

Each    2.75          2.75          2.75 

7758.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  regular  size,  same  as  No.  7756,  but  with  smaller 

ranges  and  finer  divisions  for  more  accurate  readings.     Graduated  in  1/4°  divisions. 

No A  B  C  D 

Eange,  degrees  Baume 10-40         30-60         50-80       70-100 

Each    5.60  5.60  5.60         5.60 

7759.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  regular  size,  same  as  No.  7758,  but  plain,  without 

enclosed  thermometer. 

No A  B  C  D 

Eange,  degrees  Baume 10-40         30-60         50-80       70-100 

Each    2.35  2.35  2.35         2.35 

7760.  HYDROMETERS,  Oil  Testing,  Baume  Scale,  regular  size,  same  as  No.  7756,  but  with  smaller 

ranges  and  very  fine  divisions  for  use  when  greatest  accuracy  is  required.  Graduated  in  i/J0° 
divisions. 

No A  B  C  D  E  F  G  H 

Range,  degrees  Baumei  10-21         19-31         29-41         39-51         49-61         59-71         69-81         79-91 

Each    6.10          6.10          6.10  6.10          6.10          6.10          6.10          6.10 

7766.    HYDROMETER,  Salt  Salometer,  highest  quality,  graduated  from  0°  to  100°  in  1°  divisions  for 

use  at  60"F.     Length,  about  11  inches 1.65 

7768.    HYDROMETER,  Salt  Salometer,  medium  grade,   graduated   from   0°    to   100°    in   1°    divisions. 

Length,  about  1 1  inches 50 

HYDROMETER,  Silver  Solution,  see  Hydrometers,  Actinometer  Scale. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


315 


No.  7796.  No.  7797. 


No.  7800. 


No.  7808. 


No.  7810. 


HYDROMETERS,  Sugar,  Brix  Scale,  highest  quality,  graduated   in   i{0°    divisions,   for  use   at 
"C.     Length,  about  12  inches. 

B  C 

6-12  12-18 

2.50  2.50 

J  K 

48-54  54-60 


No A 

Range,   degrees  Brix 0-6 

Each $2.50 

No H 

Range,  degrees  Brix 42-48 

Each   2.50 


D 

18-24 

2.50 

L 

60-66 


E 

24-30 

2.50 

M 

66-72 


F 

30-36 
2.50 

N 

72-78 


G 

36-42 
2.50 

O 

78-84 


2.50 


2.50 


2.50 


7774. 

7776. 
7780. 
7782. 
7786. 

7790. 
7794. 

7796. 

7797. 
7800. 

7808. 
7810. 


2.50 

HYDROMETERS,  Sugar,  Brix  Scale,  medium   grade,   graduated   in 
17%  °C.     Length,  about  11  inches. 

No 

Range,  degrees  Brix 0-30 

Each   75 


2.50 


2.50 


divisions,  for  use  at 
A 


B  C 

30-60         60-90 
.75  .75 

HYDROMETER,  Sugar,  Brix  Scale,  highest  quality,  for  waste  and  wash  water.  Graduated  from 
— 5°  to  +5°  in  1^0°  divisions,  for  use  at  17%°C.  Length,  about  11  inches 2.50 

HYDROMETER,  Syrup,  Balling  Scale,  highest  quality,  for  eanners  and  confectioners.  Gradu- 
ated from  0°  to  70°  in  1°  divisions.  Length,  about  11  inches 1.65 

HYDROMETER,  Syrup.  Baume  Scale,  medium  grade,  graduated  from  0°  to  50°  in  1"  divisions. 
Length,  about  11  inches 50 

HYDROMETERS,  Twaddle  Scale,  highest  quality,  graduated  in  %°  divisions.  Length,  about  11 
inches. 

No 1  2  3  4  5  6 

Range,  degrees  Twaddle 0-24        24-48       48-72       72-100100-134134-180 

Each    1.65         1.65         1.65  1.65        1.65         1.65 

HYDROMETER,  Varnish,  Baume  and  Specific  Gravity  Scales,  highest  quality  with  enclosed  ther- 
mometer, graduated  from  80°  to  10°  Baume  in  1"  divisions  and  from  0.666  to  1.000  in  0.005 
divisions.  Length,  17  inches 5.80 

HYDROMETER,  Vinegar  Solidimeter,  Baume  Scale,  highest  quality,  graduated  from  0"  to  6"  in 

%°  divisions.    Length,  about  11  inches 1.65 

HYDROMETER  JARS,  see  Cylinders. 

HYDROMETER,   Nicholson,   constant   volume.      Of  brass,  about   27  em  long  over  all,  neatly 
finished    1.50 

HYDROMETER,   Nicholson-Fahrenheit,   constant  volume.     Of  glass,  about  12.5  cm  long.      2.00 

HYDROTIMETER,  Bourdon  &  Bourdet's,  for  the  determination  of  hardness  of  water  by  means 
•   of  soap  solution.     Consists  of  a  burette  on   foot   with   scale    of   hardness   marked    on,   sample . 
flask  for  shaking  graduated  up  to  40  cc,  boiling  flask  with  mark   at   125   cc,  with   directions 
for  use 3.60 

HYGROMETER,  Simple  Form,  for  indicating  approximately  the  amount  of  moisture  in  the  air. 
In  nickel-plated  case  2%  inches  in  diameter  and  %  inch  deep,  with,  beveled  plate  glass  cover 
and  celluloid  dial  graduated  from  30  to  100  per  cent 3.00 

HYGROMETER,  Hair.     Scale  denotes  the  humidity  of  the  air  without  reference  to  tables.     In 
brass  case,  3  inch  dial '. $7.50 


316 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


No.  7814. 


No.  7826. 


No.  7832. 


7814.  HYGROMETER,  Mason,  for  determining  humidify  and  dewpoint.  Metal  scale  thermometer  of 
approximate  range  from  10°  to  120°F.,  mounted  with  insulating  support  on  a  mahogany  finish 
board  S1/"^^  inches.  Glass  cistern  and  special  wick,  with  complete  humidity  tables..  .  §5.50 


7815.  CISTERN  only  for  No.  7814  ...........................................................  65 

7816.  THERMOMETER,  Dry  Bulb,  for  No.  7814  ............................................        2.00 

7817.  THERMOMETER,  Wet  Bulb,  for  No.  7814  ............................................        2.00 

7820.  HYGROMETER,  Mason,  simpler  form  than  No.  7814.     Thermometers  not  raised,  mounted  on  oak 

board  8%x41/fc   inches.     With  complete  humidity  tables  .............................       3.00 

7821.  CISTERN  only  for  No.  7820  ..........................................................  65 

7822.  THERMOMETER,  Dry  Bulb,  for  No.  7820  ..............................................  90 

7823.  THERMOMETER,  Wet  Bulb,  for  No.  7820  .............................................  90 

7826.  HYGROMETER,    Standard,   consisting   of  two  Standard  Thermometers   (like  No.  13720) 

mounted  on  a  finely  polished  hardwood  back   17x5  inches,  metal  cistern  with  wick,  and 
certificate  for  each  thermometer  ....................................................    $13.50 

7827.  THERMOMETER,  Dry  Bulb,  for  No.  7826  ............................................        5.50 

7828.  THERMOMETER,  Wet  Bulb,  for  No.  7826  ............................................        5.50 

7832.  HYGROMETER  (Hygrodeik),  an  improved  form   of   the   Mason   Hygrometer.      Consists   of   two 

thermometers,  wet  and  dry  bulbs,  mounted  upon  the  outer  edge  of  a  chart  which  has  been 
plotted  from  new  and  corrected  tables  prepared  under  the  direction  of  the  U.  S.  Weather 
Bureau.  This  chart,  while  complicated  in  appearance,  is  very  simple  and  obviates  entirely 
the  use  of  tables  for  temperatures  between  20  and  120  degrees  Fahrenheit.  Size  of  instrument 
10x7%x3  inches.  Full  directions  furnished  with  each  instrument  ....................  13.50 

7833.  THERMOMETER,  Dry  Bulb,  for  No.  7832  ............................................        3.50 

7834.  THERMOMETER,  Wet  Bulb,  for  No.  7832  ............................................        3.50 

7838.  HYGROMETER  (Hygrodeik),  same  as  No.  7832,  but  with  chart  on  German  silver,  reading  from 

80°  to  180°F  ......................................................................      15.00 

7839.  THERMOMETER,  Dry  Bulb,  for  No.  7838  ............................................        3.50 

7840.  THERMOMETER,  Wet  Bulb,  for  No.  7838  ............................................        3.50 

7341.      CISTERN  only  for  Nos.  7832  and  7838  .................................................  80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


317 


7845. 
7848. 


7849. 
7852. 


7853. 
7856. 


7857. 


No.  7872. 


No.  784S. 


No.  7880. 


No.  7874. 


No.  7876. 


No.  7878. 


HYGROMETER,  Registering  (Hygrograph),  for  furnishing  continuous  record  of  humidity  over  a 

period  of  24  hours.     Complete  with  charts  for  one  year ".   $60.00 

CHARTS  for  Xo.  7844 Per  box  of  55      2.50 

HYGROMETER,  Sling  Psychrometer,  designed  for  the  purpose  of  obtaining  quicker  and  more 
accurate  results  than  are  possible  with  the  stationary  wet  and  dry  bulb  instruments.  Two 
special  thermometers,  carefully  selected,  are  mounted  on  a  nicely  finished  metal  plate  provided 
with  a  wooden  handle  and  swivel,  and  a  ring  for  suspending  the  instrument  when  not  in  use. 

Approximate  range  0°  to  100°F.  in  1°  divisions 6.00 

THERMOMETERS  only  of  No.  7S48 Each      1.60 

HYGROMETER,  Sling  Psychrometer,  Standard  Grade.  Similar  to  No.  7848,  but  with  thermom- 
eters of  highest  grade,  graduated  in  half  degree  divisions,  and  with  a  copper  protecting  case 

1'i "4  iiic-lu-s  long , 11.00 

THERMOMETERS  only  of  No.  7852 Each      3.50 

HYGROMETER,  Sling  Psychrometer,  Pocket  Type,  Standard  Grade.  Similar  to  No.  7852,  but 
7  inches  long  with  chain  sling  and  5-inch  thermometer  graduated  in  1"  divisions.  Complete 

with  leather  carrying  case - 13.50 

THERMOMETERS  only  of  No.  7856 Each      3.50 

7860.  HYGROMETER  WICK.  Silk,  fits  any  of  our   hygrometers 15 

7870.  ICE  BAG.  of  heavy  canvas,  20x38  cm,  for  breaking  ice 25 

7872.  ICE  CHIPPER  for  use  in  quickly  chipping  ice  to  small  bits  of  a  size  convenient  for  laboratory 

purposes.     Tinned  iron  frame,  wood  handle ' 75 

7874.  ICE   CUTTING  MACHINE.     Height,  15  inches;  weight,  14  pounds.     Hopper,  4^x6  inches  by 
about  4  inches  deep.     A  compact,  simple  and  strong  machine  which  cuts  ice  into  small  diamond 

shaped  pieces  with  ease  and  rapidity $9.50 

7876.  ICE  CUTTING  MACHINE,  with  blades  which  cut  the  ice  into  pieces  about  the  size  of  a  pea, 
Size   of    opening,  4x6   inches;    height,   18   inches;    space   occupied,   9^x9%    inches;    weight, 

30  pounds 13.00 

7878.  ICE  CUTTING  MACHINE,  similar  to  No.  7876,  but  of  larger  size,  for  floor  use.     Size  of  opening, 
8Hxl2  inches;  height,  43^  inches;  floor  space   occupied,   24x17%   inches;    capacity,   75   to   125 

pounds  of  ice  per  minute ;  weight,  280  pounds 49.00 

7880.  ICE  SHAVER  for  shaving  ice,  coarse  or  fine,  as  may  be  desired;  of  tinned  iron  with  removable 

steel  cutter .60 

IGNITION  TUBES,  see  Combustion  Tubes;  Tubes. 


318 


CENTRAL,  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


7S90. 
7891. 


DeKhotinsky  Bimetallic  Therms 

Regulator. 
(Patent  Applied  for.) 

INCUBATORS,  ELECTRICALLY  HEATED  AND  REGULATED 

INCUBATORS,  Triple  Wall,  DeKhotinsky  Electrically  Heated  and  Regulated  (Patented),  with 
new  bimetallic  regulator  and  new  system  of  ventilation  providing  for  greatest  possible  uni- 
formity of  temperature  throughout  the  incubator  chamber. 

Construction:  These  incubators  are  constructed  of  asbestos  board  on  a  steel  frame,  with  three 
walls.  The  space  between  the  two  outer  walls  is  packed  with  magnesia-asbestos  (magnesia 
85  per  cent;  asbestos  15  per  cent).  Between  the  inner  walls  is  an  air  space,  through  which 
the  air  passes  upward  from  the  heating  units  in  the  base.  Ports  are  provided  in  the  inside 
walls  of  this  air  space,  permitting  the  entrance  of  the  heated  air  to  the  incubator  chamber, 
in  which  it  passes  up  and  out  through  an  opening  in  the  false  top.  The  location  of  these  ports 
has  been  carefully  and  scientifically  determined  so  as  to  provide  a  continuous  current  of 
heated  air  to  every  corner  of  the  inner  chamber  making  the  temperature  uniform  throughout. 
This  feature  (patent  pending)  is  peculiar  to  the  DeKhotinsky  Triple  Wall  Incubator,  and  in- 
sures a  uniformity  not  possible  in  electrically  heated  incubators  of  any  other  type.  The  outer 
door  is  double  walled  and  packed  with  magnesia-asbestos.  It  is  beveled  on  the  edges,  making 
close  contact,  when  closed,  with  the  walls,  thus  preventing  leakage  of  heat.  An  inner  glass 
door  is  provided  for  inspection  of  the  interior  without  cooling  the  contents.  Between  it  and 
the  outer  door  is  a  dead  air  space  for  insulation  purposes. 

Heating  of  the  incubator  is  effected  by  means  of  four  of  our  standard  heating  units  of  Chromel 
wire  wound  on  lavite.  Those  heating  units  are  located  in  the  base  of  the  incubator  between 
the  two  bottoms,  with  an  iron  deflector  placed  over,  them  to  prevent  radiation  of  heat  from 
the  units  into  the  inner  chamber.  Three  of  these  heating  units  are  connected  in  parallel  to  the 
switch  contact  springs,  and  may  be  added  to  the  circuit  one  at  a  time  as  desired.  The  fourth 
is  connected  in  circuit  with  the  contact  points  of  the  thermo-regulator.  These  heating  units 
can  be  easily  and  quickly  replaced  from  outside  the  incubator  without  the  necessity  of  open- 
ing the  door  or  stopping  the  operation. 

Temperature  control  of  the  incubator  is  secured  by  means  of  our  new  bimetallic  thermo-regula- 
tor which  is  made  from  invar-brass  ribbon,  and  can  be  set  at  any  desired  temperature  from 
that  of  the  surrounding  air  up  to  the  maximum  heat  capacity  of  the  incubator.  This  range 
of  temperature  permits  the  use  of  these  instruments  as  incubators,  paraffine  baths,  drying 
ovens  or  sterilizers.  The  precision  of  action  of  this  thermo-regulator  is  ^"G.  The  make-and- 
bteak  contact  of  the  thermo-regulator  is  located  outside  the  incubator,  to  prevent  the  possi- 
bility of  ignition  of  inflammable  gases,  developed  in  the  inner  chamber  when  used  as  a  dry- 
ing oven,  which  often  occurs  when  the  contact  is  made  and  broken  inside.  A  pilot  lamp  on 
top  of  the  incubator  is  connected  in  series  with  the  thermo-regulator,  enabling  the  operator 
to  determine  at  a  glance  whether  the  incubator  is  regulating.  These  instruments  can  be  oper- 
ated on  either  A.C.  or  D.C.  circuits.  Complete  with  Hubbell  receptacle  and  five  feet  of  flex- 
ible asbestos  covered  cord  with  separable  Hubbell  attachment  plug. 

No A  B  C 

Height  inside,  inches 10%          14%         19% 

Width   inside,   inches 17 

Depth  inside,  inches 6%  11%  14 

Shelf  space,  square  inches 91  282  47f> 

For  110  volts $55.00         90.00       145.00 

For  220  volts   57.50         92.50       147.50 

T.,r  EXTRA  HEATING  UNITS  for  Nos.  7830-1,  see  Nos.  7520-7. 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


319 


7898.    INCUBATORS,  Single  Wall,  DeKhotinsky  Electrically  Heated  and  Regulated  (Patented),  with 

new  bimetallic  thermo-regulator. 

Construction:  The  incubator  is  built  of  *4-inch  asbestos  board  on  a  steel  frame  with  a  founda- 
tion of  %-ineh  asbestos  board.  To  effect  the  greatest  uniformity  of  temperature  possible  in 
an  incubator  of  the  single  wall  type,  the  heating  units  are  placed  between  two  bottoms,  the 
upper  bottom  being  protected  from  the  direct  heat  of  the  units  by  an  iron  deflector.  Air 
heated  by  the  units  passes  back  between  the  bottoms,  up  through  the  space  between  the 
double  back  to  the  upper  part  of  the  incubator,  and  after  circulating  through  the  chamber 
returns  to  the  inter-bottom  space  by  way  of  an  opening  in  the  front  part  of  the  false  bottom. 
Two  shelves  of  the  grid  type  are  provided  which,  by  means  of  racks,  may  be  set  at  any 
desired  height.  An  inner  glass  door  permits  inspection  of  the  interior  without  cooling  the 
contents.  The  incubator  is  mounted  on  a  japanned  steel  base. 

Heating  of  the  incubator  is  effected  by  means  of  four  of  our  standard  heating  units  of  115 
watts  each,  three  of  which  are  permanently  connected  to  the  switch  contact  springs,  and  the 
remaining  one — the  heat  regulating  unit — is  in  circuit  with  our  bimetallic  thermo-regulator 
for  automatic  control  of  the  desired  temperature.  The  system  is  fused  for  protection. 
Temperature  control  is  effected  by  means  of  our  new  bimetallic  thermo-regulator,  which  is 
made  from  invar-brass  ribbon,  and  can  be  set  at  any  desired  temperature  from  that  of  the 
surrounding  atmosphere  to  the  maximum  heat  capacity  of  the  incubator,  about  95°C.  This 
range  of  temperature  permits  the  use  of  these  instruments  as  incubators,  paraffine  baths,  or 
inactivation  chambers.  The  precision  of  action  of  this  thenno-regulator  is  ^4°C.  The  make- 
and-break  contact  of  the  thermo-regulator  is  located  outside  the  incubator,  to  prevent  the 
possibility  of  ignition  of  inflammable  gases  developed  in  the  inner  chamber  when  used  as  a 
paraffine'oven,  which  often  occurs  when  the  contact  is  made  and  broken  inside.  A  pilot  lamp 
on  top  of  the  incubator  is  connected  in  series  with  the  thermo-regulator,  enabling  the  operator 
to  determine  at  a  glance  whether  the  incubator  is  regulating.  These  incubators  can  be  oper- 
ated on  either  A.C.  or  D.C.  circuits.  Complete  with  two  extra  cartridge  fuses,  Hubbell  recep- 
tacle, and  5  feet  of  flexible  asbestos  covered  cord  with  separable  Hubbell  attachment  plug. 

Xo A  B 

Height  inside,  inches 12  12 

Width  inside,  inches 11  11 

Depth  inside,  inches 9  9 

Shelf  space,  square  inches 220  220 

For  volts 110  220 

Each    $50.00        52.50 

7900.  INCUBATORS,  Single  Wall,  DeKhotinsky  Electrically  Heated  and  Regulated,  of  same  con- 
struction as  Xo.  7898.  but  larger,  with  two  doors  and  with  eight  115-watt  heating  units.  With 
same  equipment  as  No.  7898. 

No A  B 

Height  inside,  inches 14  14 

Width  inside,  inches 18  18 

Depth  inside,  inches 12  12 

Shelf  space,  square  inches 430  430 

For  volts 110  220 

Each   70.00        72.50 

For  EXTRA  HEATING  UNITS  for  Nos.  7898-7900,  see  Nos.  7526-7. 
For  EXTRA  FUSES  for  Nos.   7898-7900,  see  No.  9850. 


320 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  7908. 
Size  No.  41. 


No.  7908. 
Size  No.  1. 


No.  7908. 
Size  No.  33. 


Electro-Thermostat  of  No.  7908. 


INCUBATORS,  Electric,  Wood  Frame,  with  electro-thermostatie  control. 

Construction:  The  walls  are  constructed  of  successive  layers  of  transite,  tar  paper,  animal  hair, 
tar  paper  and  five-ply  wood,  the  latter  consisting  of  quarter  sawed  oak  over  fibrous  chestnut. 
The  No.  1  Incubator,  because  of  its  small  size,  is  sheathed  with  a  solid  wall  of  quarter- 
sawed  oak  %  inch  in  thickness.  The  others  all  have  the  five-ply  construction.  By  this  con- 
struction, excellent  insulation  is  secured,  without  danger  of  warping  under  the  influence  of 
heat  or  capillary  moisture  from  inside  the  incubating  chamber.  The  doors  are  provided  with 
glass  for  observation  of  the  contents,  except  in  the  larger  sizes  (Nos.  11-41),  where  an  inner 
door  of  glass  is  provided  with  the  entire  outer  door  made  of  wood.  The  outer  wall  of  quarter- 
sawed  oak  is  finished  in  the  natural  color  and  highly  polished. 

Heating  is  accomplished  by  means  of  incandescent  carbon  filament  lamps,  which  heat  quickly 
and  cool  quickly.  The  sizes  of  these  are  selected  according  to  the  cubic  contents  to  be 
heated.  If  specified  when  ordered,  the  incubators  can  be  furnished  with  wire  wound  electric 
heaters  with  pilot  lights. 

Ventilation  is  provided  for  by  means  of  two  holes  in  the  smaller  sizes,  one  near  the  bottom 
through  which  cold  air  enters,  the  other  at  the  top  through  which  the  warm  air  escapes.  In 
the  larger  sizes,  there  are  four  holes  for  entrance  and  escape  of  air,  and  the  lamps  are  pro- 
vided with  chimneys  for  the  purpose  of  creating  air  currents.  In  this  manner,  a  constant  air 
current  is  maintained. 

Regulation  of  the  temperature  is  effected  by  means  of  the  electro-thermostat,  which  consists  of  a 
diaphragm  of  hard  rubber  and  a  metal  disk  riveted  together.  The  difference  in  the  expansion 
of  the  hard  rubber  and  metal  causes  the  former  to  become  cup-shaped  thus  moving  forward 
the  center  to  which  a  platinum  contact  is  attached.  As  the  temperature  is  lowered  the  motion 
is  reversed.  By  this  means  contact  is  alternately  made  and  broken  between  two  platinum 
points  in  circuit  with  the  lamps,  one  attached  to  the  diaphragm,  the  other  to  a  thumb  screw 
passing  through  the  bridge  across  the  thermostat,  thus  controlling  the  temperature.  A  con- 
denser is  provided  by  which  the  electric  spark  between  the  contact  points  is  quenched,  pre- 
venting the  points  from  being  quickly  used  up.  The  thermostat  and  condenser  are  mounted 
on  a  transite  base. 


TEXTUAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


321 


Nos.  7912-3. 


No.  7916. 


INCUBATORS,  Electric,  Wood  Frame,  Continued. 

Each  incubator  is  furnished  complete  with  6  feet  of  connecting  cord  and  plug  for  attachment 
to  any  lamp  socket,  Centigrade  thermometer,  and  wire  screen  shelves. 
Shipping  weight, 

Xo 

Height 

30 


11 


1.3 


31 


32 


3.3 


41 


inside, 

inches  

Width  inside, 

inches  

Depth  inside, 

inches  

No.  of  shelves. 
Xo.  of  lamps . . 
Candle  power 

of  lamps.  . . . 


26 
18 

18 
1 
2 

16 


15 


12 


- 


Doors    single     double  single  double 


7908. 
7909. 


Height  < 
inches 
Shippin; 
Ibs.    . 

of  stand, 
i    ... 

r  weig] 

it, 

,      15 
.   20.00 
.   20.00 

145 

72.50 
72.50 

90 

25.00 
25.00 

38 
44.00 
44.00 

For  110 
For  220 

volts  . 
volts  . 

50 
18 

18 
4 
2 

16 

double, 
inner 
one  di- 
vided 
20 

300 
150.00 
150.00 


36 

18 
3 
3 

16 


30 
20 

18 
.3 
2 

16 


double,   double 
divided 

in 
middle 


26 
18 

18 
1 


16 

double 


30 
36 

18 
.3 
3 


.30 


20 
18 


220 
165.00 
165.00 


175 
85.00 
85.00 


32 

180 
85.00 
85.00 


16 

16 

double, 

double 

divided 

in 

middle 

32 

32 

265 

220 

180.00 

97.50 

180.00 

97.50 

7912. 
7913. 
7916. 


For  PARAFFINE  OVENS  of  same  construction  as  Xo.  7908  Incubators,  see  Paraffine  Ovens  Xo. 

10122. 

INCUBATORS,  Electric  Compartment,  of  same  construction  as  No.  7908  but  with  incubating 
space  divided  into  compartments,  each  of  which  is  provided  with  a  finely  finished  quarter- 
sawed  oak  front  with  drawer  pull  for  removing.  The  method  of  heating  and  temperature  con- 
trol are  the  same  as  described  under  Xo.  7908.  Ventilation  and  circulation  of  air  through  the 
various  compartments  are  provided  for  by  making  the  drawers  of  perforated  galvanized 
steel,  sliding  on  steel  frames.  Depth  of  each  compartment  inside,  IS  Inches;  height,  6  inches; 
width.  5  inches.  Each  incubator  is  mounted  on  an  angle-iron  support  of  convenient  height, 
and  furnished  with  6  feet  of  connecting  cord  and  plug  for  attachment  to  any  110- volt  lamp 

socket  and  with  Centigrade  thermometer.    No A  B  C  D 

Xumber  of  drawers 12  24  36  48 

Height  outside,  inches 42  41  48  55 

Width   outside,   inches 22  42  42  54^ 

Depth    outside,   inches 23>i          23%         23%          23% 

Height  of  stand,  inches 26  26  20  20 

For  110  volts. 250.00       350.00       490.00       575.00 

For  220  volts 250.00       350.00       490.00       575.00 

ELECTRIC  HEATING  DEVICE  for  changing  a  gas  heated  incubator  into  an  electric,  consist- 
ing of  an  incandescent  lamp,  Electro-Thermostat  Xo.  1.3756  and  condenser  mounted  together 
on  a  transite  base  with  cord  and  plug  attached  ready  for  connection  to  any  110-volt  lamp 
socket.  This  outfit  can  be  placed  on  the  bottom  of  any  incubating  chamber  "with  a  capacitv 
not  exceeding  3600  cubic  inches  and  the  cord  run  through  the  hole  usually  found  at  the  bot- 
tom of  the  incubator  on  the  right  hand  side.  If  the  incubator  is  water  jacketed,  the  water 
should  be  removed  to  secure  the  best  results.  Space  occupied  by  heater,  8x8x4l£  inches  high. 
Weight  packed  for  shipment,  8  pounds.  For  110  volts .' 13.75 


322 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


7918.  ELECTRIC  HEATING  DEVICE  for  electrifying  small  incubators,  similar  to  No.  7916,  but 
smaller,  with  two  special  8  candle  power  lamps  mounted  on  a  %fi  inch  transite  base  with 
thermostat,  protected  from  above  by  a  shelf  of  transite.  Method  of  installing  is  the  same 
as  for  No.  7916.  Height  of  heating  device,  3  inches;  length,  4V2  inches;  width,  5  inches. 
Complete  with  attachment  cord  and  plug,  for  110  volts $13.75 

7920.  ELECTRIC  HEATING  DEVICE  for  large  incubators,  consisting  of  two  16-candle  power  incan- 
descent lamps  protected  by  metal  chimneys  and  Electro-Thermostat  No.  13756,  wired  together 
with  attachment  plug  and  cord  ready  to  install.  The  method  of  installing  is  the  same  as  given 
under  No.  7916.  This  equipment  can  be  used  successfully  in  incubating  chambers  not  exceed- 
ing 8200  cubic  inches  in  cubical  space.  Weight  packed  for  shipment,  12  pounds.  For  110 
volts 20.00 

ELECTRIC  HEATING  PLATES,  for  use  in  Incubators  No.  7908  and  7909  in  place  of  carbon 
lamps  with  chimneys,  where  a  dark  chamber  is  desired.  The  heater  consists  of  a  plate  of 
transite  mounted  on  porcelain  legs,  on  the  under  side  of  which  are  mounted  a  sufficient  num- 
ber of  Heating  Units  No.  7926D  to  maintain  a  temperature  of  37y2°C.  Units  are  easily  re- 
movable and  replaceable  in  case  of  injury.  A  pilot  lamp  is  mounted  in  the  circuit. 

No A  B  C  D  E  F  G  H  J 

For  incubator,  No....       2  3  11  12  1.3  31  32  33  41 

For  110  volts 8.25  4.50  6.50  8.25  8.25  8.25  8.25  8.25  8.25 

For  220  volts..  8.25  4.50  6.50  8.25  8.25  8.25  8.25  8.25  8.25 


7922. 
7923. 

7926. 


ELECTRIC  HEATING  STOVES  and  UNITS  for  electrifying  gas  heated  incubators.  These  are 
for  permanent  installation  and  should  be  installed  and  wired  by  an  experienced  electrician. 
They  should  be  used  with  Electro-Thermostat  No.  13756  for  temperature  control.  They  con- 
sist of  resistance  wire  wound  on  an  insulating  medium,  and  in  the  case  of  Nos.  A,  B  and  C 
are  mounted  on  transite  base  and  protected  by  a  perforated  metal  shield.  No.  E  is  intended 
to  be  used  with  clips,  such  as  are  used  for  fuses.  No.  D  can  be  attached  by  means  of  binding 
posts.  All  are  wound  for  use  on  110  volts.  * 


No 

Size  of  heater,  inches. 
Capacity,   amperes 
Becommended    use.  . .  . 


Each 


A 

14x5x3% 
%  to  3 
incubating 
rooms 


12.00 


B 

9x3  %x3 
%  to  3 
large  incuba- 
tors and 
incubating 
rooms 
10.00 


C 
9x2 

small 
incubators 


5.00 


small  and 

medium    sized 

incubators 

1.00 


E 

1  to  iy.2 
sterilizers 


2.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


323 


7936. 
7937. 
7938. 
7939. 


INCUBATORS, 
WATER  JACKETED 


No.  7936F. 

INCUBATOES,  Triple  Wall,  constructed  of  heavy  polished  copper,  reenforced  at  all  points 
subject  to  strain.  The  outer  walls  are  covered  with  a  heavy  waterproof  insulating  material 
bound  at  the  edges  by  copper  trimmings.  The  walls  are  triple  in  construction,  forming  an 
inner  water  jacket  surrounded  by  an  air  space.  The  walls  of  the  water  jacket  are  reenforced 
to  prevent  bulging  due  to  the  water  pressure.  The  outer  door  is  double  walled,  with  beveled 
edges  cushioned  with  felt  to  exclude  air.  The  inner  door  is  of  plate  glass,  separated  by  a  dead 
air  space  from  the  outer  door,  permitting  inspection  of  the  contents  without  cooling  the  inner 
chamber.  The  bottom  of  the  incubator  is  made  conical  in  shape  to  distribute  the  heat  and  pre- 
vent it  striking  at  one  point.  Two  openings  in  the  bottom  together  with  a  slide  ventilator, 
permit  the  control  of  the  heated  air.  The  interiors  are  furnished  with  woven  wire  trays  with 
edges  bound  with  copper,  supported  by  brackets  riveted  to  the  sides. 

Circulation  of  air  is  provided  for  in  the  incubating  chamber  by  means  of  a  long  pipe  which  runs 
through  the  water  space,  thus  preheating  the  air.  The  thorough  insulation  of  the  incu- 
bating chamber  by  means  of  a  water  jacket,  an  air  space  and  a  non-conductive  outer  cover- 
ing, makes  precise  regulations  of  the  temperature  an  easy  matter,  whether  the  heat  is  fur- 
nished by  gas,  oil  or  the  electric  current.  All  incubators  are  supplied  with  sheet  iron  bases  to 
protect  from  drafts,  the  doors  of  which  have  mica  windows  through  which  the  flame  may  be 
observed.  Tubulations  are  provided  for  thermometer,  thermo-regulator,  ventilation  and  filling. 
A  ga<;e  gla?s,  open  at  the  top,  indicates  the  amount  in  the  water  jacket.  A  stop-cock  enables 
the  water  to  be  cut  off  from  the  glass  in  case  it  is  broken,  and  a  faucet  is  attached  for  drain- 
ing the  jacket.  Incubators  may  be  obtained  without  any  equipment  for  heating  or  regulation 
by  those  who  already  possess  such  apparatus. 

For  gas  heating,  a  Koch  safety  burner  is  provided  with  six  feet  of  metallic  tubing,  an  incu- 
bator thermometer  and  a  Reichert  thermo-regulator,  which  is  connected  by  a  metal  tube  pass- 
ing through  the  air  jacket  to  the  burner.  The  Koch  Safety  Burner  will  automatically  cut 
off  the  gas  supply  within  15  seconds  after  the  flame  is  extinguished. 

For  oil  heating,  an  oil  lamp  is  supplied,  together  with  a  thermo-regulator  which  operates  a 
damper  controlling  the  escape  of  the  heat  or  its  admission  to  the  incubator.  A  thermometer 
is  also  furnished. 

For  electric  heating,  replaceable  heating  units  are  furnished  together  with  a  thermo-regulator, 
relay,  incubator  thermometer  and  connecting  cord  and  plug  for  attachment  to  any  lamp  sock- 
et. Either  of  the  above  methods  of  heating  and  temperature  control  will  maintain  a  con- 
stancy of  %°C.  within  the  incubating  space.  These  incubators  can  also  be  used  satisfactorily 
as  raraffine  ovens. 

B  C  D  E  F  G 

19  18  19  19  25  28 

18  30  12  18  30  18 

U  14  9%  914  18  14 

15  30  15  15  30  30 

121121 

141.25       209.75       105.00       121.00       245.00       182.00 

179.75        248.25       120.00       143.00       283.55       220.25 

178.25        248.25       142.00       158.00       283.50       220.50 


Xo. 

Height  inside,  inches. . 
Width  inside,  inches... 
Depth  inside,  inches  — 
Height  of  base,  inches. 

Xumber  of  doors 

Without  heating  equipment. . 
With  gas  heating  equipment . . 
With  oil  heating  equipment . . 
With    electric    heating    equip- 
ment .   101.00 


12 

9i» 

15 

1 

.5  69.50 

8450 

106.50 


In  ordering  No.  7939,  kindly  state  voltage  and  nature  of  current. 


204.00       274.00       158.00       179.75       313.50       249.25 


324 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  7950. 


INCUBATORS,  Double  Wall,  similar  in  construction  to  No.  7936,  but  without  air  space  around 

the  water  jacket.     With  sheet  iron  base  9  inches  high  with  opening  on  the  side  for  burner, 
and  with  one  shelf.     Can  be  used  satisfactorily  as  a  parafftne  oven. 

No ". A               B 

Height  inside,  inches 10              12 

Width   inside,   inches 8                10 

Depth  inside,  inches 8               10 


7946. 
7947. 


Without  heating  equipment $51.00 


69.50 


7950. 
7951. 
7000. 


With  gas  heating  equipment 65.00  84.50 

INCUBATOR,  Double  Wall,  round  form,  for  use  where  only  a  small  number  of  cultures  is  han- 
dled at  a  time.  Made  of  polished  copper  with  a  2-inch  water  jacket,  covered  with  an  insu- 
lating material.  Two  covers  are  provided,  the  inner  one  of  glass  to  permit  inspection  of  the 
contents.  With  water  gage,  stop-cock  for  draining  and  perforated  tray,  mounted  on  sheet 
iron  base  9  inches  high  with  opening  for  Bunsen  burner. 

Height  inside,  9  inches.  Height  outside,   12  inches. 

Diameter  inside,  8  inches.  Diameter  outside,  12  inches. 

Without   heating    equipment 22.00 

With  gas  heating  equipment 30.00 

INCUBATORS,  Low  Temperature,  Electrically  Controlled,  for  gelatine  cultures  at  20°C.,  or  for 
use  at  any  other  predetermined  temperature.  Constructed  entirely  of  copper  and  asbestos 
board,  with  no  wood  casing  to  warp  or  decay.  The  walls  are  thoroughly  insulated  to  prevent 
the  passage  of  heat.  No  running  water  is  used.  The  internal  arrangement  provides  for  a 
perfect  circulation  of  air  and  consequent  uniformity  of  temperature  throughout  the  incubat- 
ing chamber.  Equipped  with  electric  thermo-regulator  with  pilot  lamp. 

Height  outside,  28  inches.  Height  inside,  14  inches. 

Width  outside,  14%  inches.  Width  inside,  12  inches. 

Depth  outside,  16%  inches.  Depth  inside,  12  inches. 

Height  of  base,  12  inches. 

Complete  with  6  feet  of  connecting  cord  and  plug  for  attaching  to  lamp  socket.  Can  be  used 
on  either  A.  C.  or  D.  C.  circuit. 

No A  B 

For   volts 110  220 

Each    .  225.00      225.00 


CEXTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


325 


No. 


No.  7964. 


7964.  INCUBATOEa  Low  Temperature,  Thelco,  Electrically  Controlled,  with  walls  composed  of  ten 
distinct  layers  of  wood,  porcelain,  impervious  sheeting,  dead  air  spaces  and  wool  felt.  The 
outside  covering  is  of  porcelain,  fused  on  steel,  with  aluminum  trimmings  around  the  doors, 
edges  and  corner.  The  Incubator  contains  two  chambers,  an  upper  for  ice  and  a  lower  for 
the  water-jacketed  working  compartment,  each  with  its  own  outside  door.  The  ice  chamber 
is  one-piece  porcelain  lined,  and  is  equipped  with  a  heavy  galvanized  ice  rack.  The  capacity  of 
this  chamber  is  about  75  pounds  of  ice,  which  will  last  several  days  in  a  warm  laboratory.  'The 
electric  heating  element,  or  plate,  covers  the  bottom  of  the  lower  chamber  and  is  renio'vable. 
This  heating  element  is  made  of  asbestos  transite,  wound  with  a  special  resistance  wire  and 
can  be  depended  upon  to  run  indefinitely  without  attention.  The  working  compartment  is  placed 
within  the  lower  chamber  directly  on  the  heating  element.  It  is  a  heavy  triple-walled  cop- 
per jacket,  the  space  between  the  walls  filled  with  water,  and  the  arrangement  is  such  that 
while  in  use  the  water  is  in  constant  circulation.  A  constant  water  level  attachment  is 
placed  on  the  outside  of  the  incubator  so  that  water  in  the  walls  of  the  copper  jacket  is 
automatically  kept  at  a  constant  leveL 

The  bimetallic  thermostat  is  located  in  the  top  of  the  working  compartment  and  is  regulated  by- 
means  of  a  milled  head  screw  from  the  outside.  A  pilot  lamp  indicates  when  contact  is 
made  and  broken.  The  thermostat  can  be  qnicklv  and  easily  set  to  give  any  desired  tem- 
perature between  10"C.  and  40'C. 

The  working  compartment  is  provided  with  a  cushioned  glass  door  to  allow  inspection  of  the 
contents  of  the  chamber  without  exposure  to  the  warm  outer  air.  Complete  with  two  adjust- 
able shelves,  adjustable  ventilator,  snap  switch,  and  connecting  cord  and  plug 

^T°    •• '"A  B 

For  volte JJQ  220 

Eacn    $330.00      330.00 

7974.  INCUBATOR.  Opsonic,  for  maintaining  pipettes  of  blood  serum  at  a  temperature  of  37*C. 
Constructed  of  heavy  polished  copper  with  tabulations  for  thermometer,  gas  regulator  and 
for  filling  the  bath,  and  with  receptacles  for  20  pipettes,  numbered  in  order.  A  cup  3*6  by  1 
inch  is  provided  for  holding  instruments.  Mounted  on  a  sheet  iron  base,  8  inches  high,  with 
opening  for  Bunsen  burner.  Type  A  is  provided  also  with  six  holes,  %  inch  in  diameter  in 
the  top  to  hold  test  tubes.  Without  burner  or  regulator 

No 

Height,    inches 

Width,  inches 

Depth,  inches 

Each    .".".".".".".".'.'.".'.".".".".' 

INDUCTION  COILS,  see  Electrical  Apparatus. 
INK.  DIAMOND,  see  Diamond  Ink. 
INK.  Drawing.  «ee  Drawing  Ink. 


A 
.U 

- 

6 
HA 


B 
14 

- 

4 

BUI 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  7984. 


No.  7990. 


No.  8000. 


7984.     INOCULATING  NEEDLE,  a  platinum  needle  40  mm  long,  of  No.  28  wire,  set  in  a  glass  han- 
dle          $0.80 

7986.     INOCULATING  NEEDLE,  same  as  No.  7984,  but  with  80  mm  of  No.  27  wire 1.80 

7990.     NEEDLE  HOLDER,  Inoculating,  of  brass,  nickel-plated,  with  screw  chuck  for  holding  platinum 
or  nichrome  wire  from  No.  28  to  No.  24  inclusive.     Length,  160  mm.     Without  wire..        .25 
PLATINUM  WIRE  for  No.  7990,  see  general  heading  Platinum  Ware. 

8000.  INSECT  BREEDING  CAGE,  of  zinc,  glass  front,  with  top,  bottom  and  sides  of  wire  gauze  for 

ventilation.     Top  and  bottom  are  removable.     Size  S^xS^xlO  inches  high 4.00 

8001.  TRAY  of  galvanized  iron,  water  tight,  for  use  with  No.  8000  Insect  Breeding  Cage  for  aquatic 

insects     50 

8004.     INSECT  BREEDING  CAGE,  all  metal,  non-corrosive,  folding,  easily  adjusted.     Top  and  sides 

of  wire  gauze  for  ventilation.     Size   12x12x16   inches   high 5.00 

8010.     INSECT  NET,   with  collapsible  steel   frame  IS^xll'/i  inches  when  open,  and  one  piece  bam- 
boo handle  30  inches  long 2.50 

8012.     INSECT  NET,  similar  to  No.  8010,  but  with  steel  frame  measuring  15x14  inches  when  open  and 

with  two-piece  jointed  handle  48  inches  long 3.50 

8018.     INSECT  PINS,  Mack,  with  round  yellow  heads;   very  stiff  with  sharp   points,   in  packages   of 

100.    No 00  0  1  2  3  4  5  6 

Per  100 25  .25  .22  .22  .22  .22  .22  .22 

Per  1000 2.00        2.00        1.90         1.90         1.90         1.90         1.90         1.90 

8020.     INSECT  PINS,  white,  with  round  heads,  in  packages  of  100. 

No 0  1     .         2  3  4  5  6 

Per   100    25          .25  .25  .25  .25  .25  .25 

Per    1000 2.00        2.00         200         2.00         200         2.00         2.00 

8026.  INSECT  SPREADING  BOARDS,  for  use  in  drying  insects  preparatory  to  mounting.  Consists 
of  two  strips  of  hardwood  cleated  together  leaving  a  groove  in  the  middle  in  which  the  body 
of  the  insect  is  placed  while  the  wings  are  pinned  to  the  two  strips. 

No A  B  C 

Length,  inches 12  12%  16Ms 

Width,  inches   4%  3%  7% 

Each    1.10  1.30  1.50 

INTERVAL  TIMER,  see  Clock,  Interval. 

JARS,  ALL  KINDS 

JARS,  Anaerobic  Culture,  see  Anaerobic  Culture  Apparatus. 

JARS,  Animal,  see  Animal  Holders. 

JARS,  Aquarium,  see  Aquarium  Jars. 
8040.    JARS,  Battery,  cylindrical  form,  of  green  glass. 

No A               B               C 

Diameter,  inches 4                5                6 

Height,  inches   5                 7                 8 

Capacity,  quarts 1                2                4 

Each 20  .25             .40 

8042.    JARS,  Battery,  cylindrical  form,  of  clear  white  glass,  frequently  used  for  aquaria  and  specimen 

work.       No A                  B                  C  D                   E 

Diameter,  mm 100               100               125  150                225 

Height,  mm 100               125               175  200                300 

Approx.  capacity,  cc 1000             1200             2500  4000             14000 

Each  .                                                                         .55               .70               1.05  1.25              3.10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


327 


8046. 


8054. 


8055. 


8056. 
8057. 
8062. 


8070. 
8071. 
8074. 


No.  8046. 


No.  8054. 


No.  8062. 


No.  8070. 


No.  8071. 


No.  8074. 


For  BATTEEY  JABS  of  other  sizes  and  shapes,  see  general  heading  Batteries. 

JARS,  Bell  Glass,  see  general  heading  Bell  Jars. 

JARS,  Chidlow's  Gas  Collection,  see  Flour  Testing  Apparatus. 

JARS,  Chidlow  Expansion,  see  Flour  Testing  Apparatus. 

JARS,  Dressing,  with  loosely  fitting  knobbed  cover. 

No A 

Height  outside  without  lid,  mm 100 

Diameter  outside,  mm 100 

Each    $1.00 

JARS,  Hydrometer,  see  Cylinders. 
JARS,  Leyden,  see  Catalog  F  of  Physical  Apparatus. 
JARS,  Mouse,  see  Animal  Jars. 

JARS,  Museum,  or  Specimen,  of  clear  white  glass,  with  diameter  of  mouth  same  as  that  of 
body.  With  glass  lid  with  rings  for  suspending  specimens,  rubber  gasket  for  sealing,  and 
metal  clamp  for  fastening  lid.  Only  those  sizes  shown  in  heavy  type  are  carried  in  stock. 
Other  sizes  can  be  furnished  on  short  notice: 


B 

120 
115 
1.25 


C 

150 
150 
1.90 


D 

210 
190 
3.00 


No  A 

B 

C 

D 

E 

F 

G 

H 

J 

K 

L 

M 

Height,     without     lid, 

inches    4 

6 

8 

12 

6 

8 

12 

18 

8 

12 

15 

18 

Diam.  inside,  inches.  .   2Vi 

2% 

21/4 

2V4 

3% 

31/2 

3J/2 

31/2 

5 

5 

5 

5 

% 

1 

1% 

1% 

21/2 

4 

6 

5y2 

8 

10 

12 

Each    96 

1.10 

1.14 

1.25 

1.50 

1.62 

1.90 

2.28 

2.90 

3.42 

3.65 

3.94 

No  N 

P 

Q 

R 

S 

T 

U 

V 

W 

X 

Y 

Z 

Height,      without    lid, 

inches   8 

12 

6 

8 

12 

15 

18 

24 

36 

12 

18 

24 

Diam.  inside,  inches..   6y4 

6% 

7% 

7% 

7% 

7% 

7% 

7% 

7% 

11% 

11% 

11% 

Capacity,   pints  8 

12 

9 

12 

18 

20 

28 

36 

56 

36 

58 

80 

Each    3.72 

4.20 

5.40 

5.70 

6.65 

7.20 

7.65 

8.80 

11.45 

13.50 

17.10  21.40 

LIDS  only  for  No.  8054. 

Diameter,   inches  

2% 

3% 

5 

6% 

7% 

11% 

Each    

.10 

.18 

.35 

.45 

.90 

2.25 

RUBBER  GASKETS  only  for  No.  8054  

.  .  each 

.10 

.18 

.62 

.70 

1.05 

2.40 

CLAMPS  onlv  for  No.  8054 

.  .  each 

.45 

.55 

.75 

.95 

1.55 

2.90 

JARS,   Museum  or  Specimen,   of  clear  white  glass,  wide  mouth,  with  glass  stoppers  carefully 

ground  in  to  make  air  tight 

seal. 

Sizes 

printed  in 

heavy 

type 

are  carried 

in   stock; 

other 

sizes  will  be  furnished  on  short  notice. 

No  

A 

B 

C 

D 

E 

F 

G 

H 

J 

K 

L 

Diameter  of  body,  inches.  . 

1% 

iy2 

2 

2 

o 

2% 

2% 

21/2 

3 

3 

3 

Height  to  shoulder,  inches. 

.    2 

3 

21/2 

3% 

5 

3% 

5 

7 

4 

6 

8 

Diameter  of  mouth,  inches. 

1% 

1% 

11/2 

11/2 

11/2 

2 

2 

2 

21/2 

2!/2 

21/2 

Height    to    top    of    stopper, 

inches    

3% 

4!/2 

41/2 

5% 

6% 

7 

7 

9 

61/4 

81/4 

10% 

Capacity,   ounces  

1% 

21/2 

31/2 

5 

7 

8 

12 

16 

12 

20 

20 

Each    

.44 

.47 

.50 

.55 

.62 

.65 

.75 

.80 

.82 

.94 

1.10 

No  

M 

N 

P 

Q 

R 

S 

T 

U 

V 

W 

Diameter  of  body,   inches.  . 

3% 

33/4 

33/4 

4% 

4% 

4i/2 

6 

6 

6 

6 

Height  to  shoulder,  inches. 

6 

8 

10 

5 

8 

12 

7 

10 

12 

15 

Diameter  of  mouth,  inches. 

3 

3 

3 

3% 

3% 

31/2 

5 

5 

5 

5 

Height  to  top  of  stopper,  inches.  . 

8% 

101/2 

121/2 

7% 

10% 

143/4 

10 

13 

15 

18 

Capacitv,   ounces  

32 

40 

56 

40 

64 

98 

100 

144 

168 

212 

Each    

1.25 

1.50 

1.80 

1.55 

1.95 

2.30 

2.75 

3.60 

3.85 

4.50 

JARS,  Nessler,  see  Colorimetric 

Apparatus. 

JARS,  Percolating,  graduated  in 

ounces. 

Capacity  to  top  mark,  gallons  %            % 

1 

2 

Each    , 

2.00 

2.90 

4.40 

6.50 

JARS,  Percolating,  same  as  No. 

8070, 

but  graduated  in 

cc. 

Capacity   to   top  mark,   cc. 

1000 

2000 

4000 

8000 

Each    

2.00 

3.00 

4.50 

6.70 

JARS.  Precipitating,  of  heavy  glass  with  lip. 

Capacity,    pints  

?4 

% 

1 

2 

4 

8 

16 

24 

Each    

55 

.60 

.85 

1.15 

1.50 

1.85 

3.30 

6.65 

328 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8078. 


No.  8086. 


No.  8090. 


No.  8092. 


No.  8094. 


No.  8096. 


No.  8098. 


No.  8100. 


No.  8104. 


No.  8106. 


No.  8108. 


JAES,  Preparation,  with  glass  covers,  see  Dishes,  Preparation. 
JABS,  Sample,  Screw-cap,  see  Bottles,  Sample. 
8078.    JABS,  Sample,  glass,  with  metal  screw  cap;  valuable  for  samples,  etc. 

Capacity,   ounces 2 

Per   dozen $0.60 


4 
.65 


8086. 


8090. 


JABS,  Specie,  of  glass  with  metal  cover,  for  collecting  gases,  storing  chemicals,  etc. 

Capacity,    quarts 1  2 

Each    30          .45 

JABS,  Specimen,  of  glass,  with  knobbed  cover  loosely  fitting.     Knob  is  sunk  to  permit  stack- 
ing of  jars. 


S 
1.10 

4 
.60 


No A  B  C  D  E 

Height,    inches 2y2  3%  5  66% 

Diameter  of  top,   inches 6%  6%  8y2  9%  10% 

Diameter   of   bottom,   inches 5%  5%  7y2  8%  9% 

Capacity,    pints 2  3  6  9  13 

Each    40  .50  1.20  1.50  2.50 

8092.     JABS,   Specimen,   of  glass,  with   glass  cover  provided  with  rubber  ring  for  sealing. 

No A  B  C 

Height  outside,  inches.  . 5%  7*4  8y2 

Diameter   of   mouth,   inches 3%  4%  5% 

Capacity,    quarts 1  2  4- 

Each    30  .50  .80 

8094.     JAES,  Specimen,  of  clear  glass  with  cover,  clamping  device  and  rubber  gasket. 

No A  B  C  D 

Height,    inches 2y2  3%  3%  5% 

Diameter,   inches 2%  3  3%  3% 

Capacity,    ounces 4%  8  9  14 

Each    .  15  .20  .25  .30 


11% 

8% 

16 

3.25 

D 
11 

7y2 

8 
2.00 

E 

4% 
41/4 
23 
.35 


8096.     JAES,  Specimen,  Calcutt's,  made  entirely  of  glass,  so  there  is  no  danger  of  corrosion.     A  half 
turn  of  the  cover  renders  the  jar  air  tight. 

Capacity,    pints 1  2 

Each    .19  .39 

Per    dozen 1.90  3.90 

JAES,  Specimen,  Inverted  Show,  see  Bottles,  Inverted  Show. 
8098.    JAES,  Specimen,  Mason's  Fruit,  with  screw-lids  and  rubber  gaskets  for  sealing. 

Size,  quarts V>                    1  2 

Each 071/2             .08  .11 

Per  dozen 75                .80  1.10 

8100.    JABS,  Specimen,  Sure  Seal,  with  glass  cover,  metal  clamping  device  and  rubber  gaskets. 

Size,  quarts y2  1 

Each 15  .16 

Per  dozen 1.50  1.60 

8104.     JABS,  Staining,  Coplin's,  for  ten  3xl-inch  slides,   with   glass  lid each  .45 

per  dozen  4.50 

8106.     JAB,  Staining,  Naples,  of  clear  glass,  with  loosely  fitting  hemispherical  cover.     Height,  90  mm; 

diameter,  35  mm 75 

8108.     JAB,  Staining.  Naples,  same  as  No.  8106,  but  with  cork  stopper,  without  glass  cover. .  .65 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


329 


No.  F6065. 


No.  8140. 


No.  8142. 


No.  8148. 


No.  8146. 


No.  8150. 


8112.     JABS,  Stoneware,  with  handles  and  covers  for  storing  ordinary  chemicals.     Preferable  to  a  gal- 
vanized iron  can  for  refuse.    Capacity,  gallons..          y>  1  2  4  6  8 

Diameter,   inches ". 5          6%          8^4        10%        10%  12 

Height,   inches • 5%  8          8%        10%  13        15% 

Each    $0.35  .50  .75         1.50         2.00         3.00 

8114.     JARS,  Stoneware,  with  cover  and  nickel-plated  metal  stopcock,  for  storing  distilled  water,  etc. 

Capacity,  gallons 3  5  8  10  15 

Each    2.50        3.25        6.00       10.00      13.00 

8116.     JAR,  Stoneware,   for  storing  distilled  water   or    acids,    with    ground    stoneware    stop-cock    and 

water  level.     Capacity,  50  liters 30.00 

8120.     JARS,  Tumblers,  Jelly,"  with  cover,  200  cc  capacity per   dozen       .60 

8140.     KETTLES,   Evaporating,   graniteware,  tin  cover. 

Manufacturer's  rated  capacity,  quarts 2  4  8 

Each    60  .80  1.10 

8142.     KETTLES,  Infusion,  double  boiler,  of  graniteware,  with  tin  cover. 

Manufacturer's  rated  capacity  of  inner   kettle,   quarts 248 

Each    1.25  2.30  2.60 

KNIFE,  for  glass  cutting,  see  Glass  Tubing  Cutters. 
KNIFE  for  mixing  dough,  see  No.  5938. 
8146.    KNIFE,  Laboratory,  good  steel  blade  4  inches  long;  round  wood  handle.    Useful  for  cutting  corks, 

etc 25 

8148.    KNIFE,  Pocket,  one  blade,  excellent  quality  steel,  iron  lined  cocoa  handle,  4-ineh 90 

8150.    KNIFE,  Pocket,  two  blades  crocus  polished,  iron  lined,  stag  handle,  4-inch.      An  excellent  all- 
round  knife • 1.50 

F6063.  KYMOGRAPH.  This  Kymograph  may  be  used  either  vertically  or  horizontally.  The  drum 
carrying  the  smoked  paper,  on  which  the  tracings  are  made,  is  15  cm  in  diameter  by  about 
15  cm  long  and  is  rotated  by  means  of  a  strong  spring  motor,  which  is  enclosed  in  a  heavy  iron 
base.  The  speed  is  uniform,  and  is  regulated  by  means  of  a  magnetic  control.  Starting,  stop- 
ping and  regulation  of  speed  is  all  done  from  the  outside.  The  shaft  carrying  the  drum  is  re- 
versible, and  each  end  has  a  clutch,  in  order  to  secure  two  speeds,  a  slow  and  a  fast,  both  of 
which  may  be  varied  by  means  of  the  magnetic  control.  Range  of  slow  speeds  from  one 
revolution  in  18  minutes  to  one  in  55  seconds;  of  fast  speeds  from  one  revolution  in  42  seconds 

to  one  in  8  seconds.     Complete  with  100  sheets  of  gummed  glazed  paper 52.50 

F0069.  PAPER,  glazed  and  gummed,  for  use  with  No.  F6065.    Size,  15x48  cm. 

.  .Per  100  sheets        .75 


330 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8168. 


POTASS,  CHROMIUM  SULPHATE 


CHROME   ALUM. 

+24H2O. 


No.  8176. 


No.  8172. 


8160.    LABELS.  Dennison's  Gummed,  rectangular  shape  with  red  border. 

No 201          205          209         213          217 

•     Length,  mm 64  42  37  30  27 

Width,   mm 40  34  28  24  20 

Per  box 08          .08          .08          .08          .08 

Per  carton  of  12  boxes      .75          .75          .75          .75          .75 


219 
38 
19 
.08 
.75 


223 
21 
17 
.08 
.75 


259 
33 
14 
.08 
.75 


261 
52 
14 
.08 
.75 


8162.     LABELS,  Dennison's  Gummed,  rectangular  shape,  with  red  border,  in  book  form,   perforated. 
Size,  about  5x9  inches. 

No 201         205         209         213         217         219         223 

Size,   mm 45x68     40x50     30x40     28x33     24x32     22x42     19x24 

Number  of  labels  in  book 225         300         500         750         750         750        1400 

Per  book $0.25          .25          .25         .25         .25         .25         .25 

Per  carton  of  12  books 2.50        2.50        2.50        2.50-     2.50        2.50        2.50 

8164.    LABELS,  Dennison's  Gummed,  oval  shape  with  red  border.    No 229         239         241 

Length,  mm 42 

Width,   mm 30  17 

Per  box 08          .08          .08 

Per  carton  of  12  boxes 75          .75          .75 

8166.     LABELS,  Dennison's  Gummed,  rectangular  shape,  large  size,  with  red  border,  in  boxes  of  100. 

No 2001        2002        2003        2004        2005        2006        2007 

Size,   inches lV2x3%      1x3%     2x4%      1x2%      I%x4     I%x4 1%x2% 

Per   box .20  .16  .30          .16  .22  .20        .  .16 

Per  carton  of  10  boxes 1.65        1.35        2.50        1.35        2.00        1.65        1.35 

8168.  LABELS,  Dennison's  Gummed,  rectangular  shape,  with  red  border,  in  rolls,  perforated,  1000 
labels  in  a  roll.  Each  roll  is  contained  in  special  box  with  slot  to  permit  drawing  out 
labels  as  needed.  Sizes  same  as  in  No.  8160. 

No 205  209  217 

Per    roll 85  .40  .60 

8172.  LABEL  BOOK,  containing  labels  for  the  most  used  chemicals  and  reagents,  each  label  having 
name  and  symbol.  Gummed,  perforated,  and  arranged  so  that  they  may  easily  be  removed 
without  destroying  the  book.  (Labels  should  be  covered  with  melted  paraffine  after  being 
put  on  the  bottle,  to  protect  them  from  acids,  etc.)  Book  contains  about  500  lab?ls.  . . .  .45 
8176.  LABELS,  Gummed,  Microscope  Slide,  of  white  paper  with  light  border,  22  mm  square,  in 
boxes  of  100 per  box  .10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


331 


No.  8200.  No.  8202.  No.  8211. 

8178.    LABELS,  Gummed,  Microscope   Slide,   same  as  No.  8176,  but  rectangular,  22x15  mm,  in  boxes 

of    100 per  box       .10 

8190.  LACQUER,  Colorless,  for  preserving  polished  metal  surfaces.     In  ounce  bottles.  .Per  ounce         .30 

8192.  LACQUER,  Gold,  in  1  ounce  bottles .Per  ounce        .40 

LACQUER  BRUSH,  see  Brush,  Lacquer. 
LACTOMETERS,  see  Hydrometers. 
8194.    LADLES,  of  wrought  iron  with  handle  and  lip.    Useful  for  fusing  metals. 

Diameter  of  bowl,  inches 2%  4 

Each  . . ; 35  SO 

LAMPS,  Alcohol,  see  general  heading  Burners. 
LAMPS,  Microscope,  see  Microscope  Accessories. 

LAMPS,  INCANDESCENT 

In  selecting  incandescent  lamps  from  those  listed  below,  attention  should  be  paid  to  the  fact  that 

the  consumption  of  carbon  filament  lamps  is  approximately  3  watts  per  candle  power,  while  that  of 

tungsten  filament  lamps  is  approximately  H4  watts  per  candle  power. 

SI 96.    LAMPS,  Incandescent,  Miniature,  tungsten  filament,  threaded  base  to  fit  No.  5124  Receptacle. 

No A  B  C 

Candle  power 1  1%  4 

Voltage 2V>  3^,  6 

Each $0.25  .30  .35 

S19S.    LAMPS,  Incandescent,  tungsten  filament,  Edison  base  to  fit  all  Edison  receptacles  and  sockets. 

No A  B 

Candle  power 4  6 

Voltage 6  8 

Each 60  .60 

8200.    LAMPS,  Incandescent,  carbon  filament,  110-volt,  Edison  base  to  fit  all  Edison  receptacles  and 

sockets.      No A  B 

Candle  power 16  32 

Each 28  .50 

8202.    LAMPS,  Incandescent,  tungsten  filament,  110-volt,  Edison  base  to  fit  all  Edison  receptacles  and 

sockets.     No A  B  C 

Watts 20  25  40 

Each 45  .45  .45 

8204.    LAMPS,  Incandescent,  tungsten  filament,  nitrogen  filled,  110-volt,  Edison  base  to  fit  all  Edison 

receptacles  and  sockets.     No A  B 

Watts 75  100 

Each 90  1.50 

8206.    LAMPS,  Incandescent,  colored  glass,  carbon  filament,  110-volt;  natural  colors,  not  dipped;  16  e.  p., 
Edison  T>ase  to  fit  all  Edison  receptacles  and  sockets. 

No A  B  C  D  E 

Color amber          blue        green        ruby        frosted  white 

Each 80  .50  .55  .55  .45 

8208.  LAMP,  Pocket  Flash,  for  use  in  store  rooms.    Vulcanized  fiber  case  with  nickel-plated  trimmings. 

Size.  l1-.x61->  inches,  with  tungsten  bulb  and  battery   1.20 

8209.  BATTERY  for"  No.  8208,  for  replacement 30 

8210.  INCANDESCENT  BULB  for  No.  S208,  for  replacement 13 

8211.  LAMP,  Standard  Incandescent,  carbon  filament,  approximately  110  volts,  16  c.  p.,  64  watts,  for 

stationary  use.     With  certificate  of  candle  power  from  the  Electrical  Testing  Laboratories. 

Accuracy  of  rating,  ¥*% 2.70 

LAMPS,  Standard  Incandescent,  tungsten  filament  of  special  construction  to  obviate  variable 
cooling  of  filament  when  it  touches  its  anchor  wires.  More  satisfactory  as  light  standards 
than  carbon  filament  lamps.  With  certificate  of  candle  power  from  the  Electrical  Testing 
Laboratories.  Accuracy  of  rating,  ^{0%.  In  ordering,  specify  the  voltage  at  which  the  lamp 
should  be  standardized.  This  may  be  between  100  and  130  volts. 

No A  B  C  D  E 

Watts   25  40  50  60  100 

8212.  LAMPS  for  stationary  use 6.75  6.75  6.75  6.75  7.80 

8213.  LAMPS  for  rotating." 6.75  6.75  6.75  6.75  7.80 


332 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  8214. 


No.  8220. 


No.  8222. 


No.  8226. 


No.  8230. 


No.  8234. 

8214.     LAMP,  DAVY'S  SAFETY,  as  used  in  mines.    Height,  about  25  cm $4.00 

LANTERNS,  Projecting,  see  Catalog  F  of  Physical  Apparatus. 
8216.     LEAD  SHOT  for  cleaning  bottles,  etc. 

Size  No 4  6  7  8  11 

Per   pound 20  .20  .20  .20  .20 

F2857.     LEATHER  BELTING,  Round. 

Diameter,  inches %  %2  %6 

Per  foot 10  .12  .18 

LECTURE  APPARATUS 

8220.    LECTURE  APPARATUS,  for  Electrolytic  Decomposition  of  Water,  simple  form  with  sliding 
graduated   tubes  and   removable   carbon  electrodes    3.50 

8222.  LECTURE  APPARATUS  for  Electrolysis  of  Water,    improved   form,   with   platinum   electrodes 

that  may  easily  be  replaced  by  copper  electrodes  or  by  carbon  electrodes  for  electrolysis  of 
hydrochloric  acid.    (See  Nos.  8*238  and  8239.)     Complete  with  support '     6.80 

8223.  GLASS  PARTS  only  of  No.  8222 3.80 

8226.  LECTURE  APPARATUS,  Hoffman's  Form,  for    electrolysis    of    water,    hydrochloric    acid,    and 

ammonia,  with  ungraduated  tubes,  two  stop-cocks  and  platinum  electrodes,  mounted  on  sup- 
port  as   shown 11.50 

8227.  GLASS  PARTS  only  of  No.  8226  with  platinum    electrodes 8.50 

8230.  LECTURE  APPARATUS.  Hoffman's  Form,  same  as  No.  8226  but  with  tubes  graduated  to  show 

volumetric  composition.     Complete  with  support    13.50 

8231.  GLASS  PARTS  only  for  No.  8230. 10.50 

8234.  LECTURE  APPARATUS,  Hoffman's  Improved  Form,  for  decomposition  of  water,  with  gradu- 

ated tubes,  glass  stop-cocks  and  removable  platinum  electrodes,  complete  with  support    13.00 

8235.  GLASS  PARTS  only  for  No.  8234  with  platinum    electrodes 10.00 

8238.  CARBON  ELECTRODES  for  use  with  Nos.  8220,  8222,  8234  and  8268,  consisting  of  two  rubber 

stoppers  fitted  with  carbon  electrodes .60 

8239.  COPPER  ELECTRODES,  same  as  No.  8238,  but  with  copper  instead  of  carbon  electrodes        .60 

8240.  PLATINUM  ELECTRODES,  same  as  No.  8238,    but    with    platinum    instead    of    carbon    elec- 

trodes           2.75 

8242.     SUPPORT  STAND  only  for  Nos.  8222,  8226,  8230  and  8234  with  binding  posts 3.00 

8246.  LECTURE  APPARATUS,  Hoffman's  Form,  for  showing  volumetric  composition  of  hydrochloric 

acid,  with  two  stop-cocks,  complete  with  support,   as   illustrated 10.80 

8247.  GLASS  PARTS  only  of  No.  8246 5.00 

8250.  LECTURE  APPARATUS,  Hoffman's,  same  as  No.  8246,  but  with  platinum  electrodes,  for  dem- 

onstrating the  volumetric  synthesis  of  ammonia  and  water.     Complete  with  support. .      8.50 

8251.  GLASS  PARTS  only  of  No.  8250,  with  platinum    electrodes 5.50 

8254.  LECTURE   APPARATUS,  Hoffman's   Eudiometer,  similar  to  No.  8250,  with  platinum  electrodes, 

two  stop-cocks,  and  graduated  arm.     Complete  with  support 13.00 

8255.  GLASS  PARTS  only  of  No.  8254,  with  platinum    electrodes 10.00 

8258.  LECTURE  APPARATUS  for  Decomposition  and  Synthesis  of  Water,  similar  to  No.  8250,  but 

with  platinum  electrodes  in  middle  of  closed  tube.     Complete  with  support 11.50 

8259.  GLASS  PARTS  only  of  No.  8258,  with  platinum    electrodes 8.50 

8262.  LECTURE  APPARATUS,  Hoffman's  Form,  for  demonstrating  the  fixed  proportions  in  the  com- 

bination of  hydrogen  and  chlorine  to  form  hydrochloric  acid.     With  glass  stop-cock,  ground 
stopper,   and  support   stand 6.50 

8263.  GLASS  TUBE  only  of  No.  8262,  with  ground   stoppers   and   stop-cock 4.00 

Note: — For  illustrations  of  Nos.  8246-62,  see  next  page. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A, 


333 


No.  8246.  No.  8250.  No.  8254.  No.  8258.  No.  8262.  No.  8268. 


No.  8284. 


No.  816. 


No.  8288. 


No.  8292. 


No.  8290. 


No.  8294. 


8268. 


LECTURE  APPARATUS,  Osborne's  Form,  for  electrolysis  of  water  and  for  study  of  conduc- 
tivity of  liquids,  ionization,  electro-plating  and  electrolysis  of  water.  A  simple,  substantial 
form  of  electrolytic  apparatus  that  can  be  used  to  demonstrate  the  principles  involved  in  the 
theory  of  electrolytic  dissociation.  It  consists  of  an  outer  U  tube  with  graduated  sliding 
tubes,  shot  valves,  glass  plug  and  platinum  electrodes,  which  are  easily  replaced  by  carbon 
or  copper  electrodes  (Nos.  8238  to  8240).  It  allows  immediate  change  of  liquids,  permits  the 
introduction  of  an  indicator,  cloth  for  bleaching,  is  reaily  cleaned,  requires  least  amount  of 
liquids  to  fill  it.  Complete  as  illustrated,  on  support  with  binding  posts,  with  instructions  for 
use $11.00 

8269.  GLASS  PARTS  only  of  No.  8268 8.00 

8270.  SUPPORT  STAND*  only  for  No.  8268 3.00 

8276.     LENS  PAPER,   Japanese,   for  cleaning  lenses,  in  sheets  7x11  inches,  in  packages  of  100  sheets. 

Per  package 35 

LENSES,  Magnifying,  see  Magnifiers. 
LETTERS,  Steel,  see  Dies. 
LEVELING  BULBS,  see  No.  1902. 
8284.    LEVEL,  Bench,  Adjustable,  with  handle  and  accurately  graduated  vial.     Length,  4  inches;  handle 

and  tube  nickeled,  base  japanned 3.30 

*2«S.    LEVEL,  Mechanics',  Iron,  12  inches  long,  ground  face  and  ends,  japanned  body,  double  plumb 

.' 2.00 

8290.    LEVEL,  Mechanics',  Wood,  ordinary  type;  10  to  16  inches  long.     Oval  top  plate,  two  side  views 

50 

8292.    LEVEL,  Pocket,  Brass,  ground  flat  on  the  base,  nickel-plated;  2  inches  long.     Very  useful  in  mak- 
ing apparatus .50 

8294.    LEVEL,  Pocket,  Iron,  japanned,  3^4  inches  long 20 

816.    LEVEL,  Round,  in  brass  case,  for  balance  cases,  drying  ovens,  incubators,  etc.     Diameter,  2.5  cm. 
4.00 


334 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8342. 


No.  8344. 


No.  8346. 


No.  8348. 


No.  8306. 


No.  F261. 


No.  8350. 


8296.    LEVEL,  Round,  ' '  Which  Way, ' '  of  steel,  nickel-plated.      Diameter,  3.5  cm $0.90 

F261.  LEVELING  SCREWS,  in  sets  of  three,  permitting  the  rapid  leveling  of  board  or  glass  plate. 
Made  entirely  of  metal,  the  base  of  which  is  accurately  planed.  Base  japanned,  screw  white 

nickel-plated.     Height,   7.5  cm;  range  of  adjustment,  13  mm Pet  set       1.65 

8306.  LIBRARY  PASTE,  best  grade. 

No A  B 

Style Collapsible  Tube          4-ounce  Screw-Cap  Jar 

Each .15  .15 

MAGNIFIERS 

8342.  MAGNIFIERS,  Doublet,  consisting  of  two  piano  convex  lenses  in  a  metal  mount,  for  use 
either  as  a  hand  magnifier  or  in  dissecting  microscopes. 

No A  B  C 

Magnifying  power,   diameters 6  9  12 

Focal   distance,   mm 41.6  27.8  20.8 

Focal  distance,  inches 1.6  1.1  0.8 

Working   distance,   mm '.         22  15  12 

Diameter  real  field,  mm 22  16  11 

Each    1.00  1.00  1.00 

8344.  MAGNIFIER.  Engravers'  Glass,  the  standard  magnifier  for  use  in  counting  colonies  of  bacteria. 
Magnifying  power,  3.5  diameters.  (See  Public  Health  Report  of  the  United  States  Public 
Health  'Service  Vol.  XXX,  No.  33,  August  13,  1915) 1.00 

8346.  MAGNIFIERS,  Linen  Testers,  extensively  used  in  elementary  biology  work,  and  for  various 
other  purposes  where  a  small  compact  magnifier  is  desired.  Folds  up  into  very  small  space. 

No A  B 

Diameter  of  opening,  inches V\  % 

Magnifying  power,  diameters 10  10 

Each    75  .75 

8348.     MAGNIFIERS,  Pocket,  in  folding  mount   of  rubber  and  zylonite,  very  light  and  durable. 

No ABC 

Diameter  of  lens,  mm 18  30  50 

Magnifying  power,  diameters 5  3.5  2 

Each   ............ 50  .75  1.35 

8350.     MAGNIFIERS,  Pocket,  same  as  No.  8348,  but  with  double  lens. 

No A  B  C 

Diameter  of  lenses,  mm 15,20       25,30       37,44 

Magnifying  power,   diameters 5-12          3.5-8         2.5-5 

Each    .'. 90  1.35          1.80 

8352.     MAGNIFIERS,  Pocket,  same  as  No.  8350,  but  with  triple  lens. 

No A  B 

Diameter  of  lenses,  mm -12,  15, 18     15,  18,  20 

Magnifying  power,  diameters 7-30  4-20 

Each    .  1.10  1.13 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


335 


No.  8361. 


No.  8366. 


No.  8368. 


No.  8376. 


No.  8378. 


No.  8386. 


8356. 


8360. 
8361. 
8364. 

8366. 
8368. 

8372 
8376. 
8378. 

8382 
8386. 


MAGNIFIERS.  Reading  Glasses,  with  nickeled  rim  and  ferrule,  and  with  black  wooden  handle. 

Xo A  B  C  D  E 

Diameter  of  lens,  inches 2  2%  3  4  4% 

Focus,    inches 5  6  7  10  12 

Each  $0.90  1.10  1.35  1.80  2.25 

MAGNIFIERS.  Triple  Aplanat,  the  highest  type  of  hand  or  dissecting  magnifier.  They  are 
perfectly  achromatic  and  free  from  distortion,  have  an  extra  long  working  distance,  and 
furnish  an  unusually  large,  flat  field. 

Xo 

Magnifying  power,  diameters 

Focal    distance,   mm 

Focal   distance,  inches , 

Working  distance,  mm 

Diameter  real  field,  mm 

Mounted  for  use  in  dissecting  microscopes 

Mounted  in  folding  case  for  hand  use 


A 

9 

27.8 
1.1 

L'4..-, 
20 

4.25 
4.25 


B 

12 

20.8 
0.8 

18.4 
15 

4.25 
4.25 


MAGNIFIER,  Tripod,  giving  a  large,  clear  field  and  sufficient  magnifying  power  for  elemen- 
tary botanical  and  zoological  studies.  The  lens  is  focused  by  screwing  up  or  down  in  the 
metal  frame 75 

MAGNIFIER.  Watchmakers'  Glass,  double  convex  lens  in  vulcanite  mounting.  Diameter,  25 
mm :  magnifying  power,  3  to  5  diameters .60 

MAGNIFIER.  Watchmakers'  Glass,  consisting  of  two  lenses  of  12  and  25  mm  diameter.  The 
front  lens  (12  mm)  can  be  removed  by  unscrewing,  thus  permitting  the  use  of  the  rear  lens 
(25  mm).  Magnifying  powers,  4  and  7  diameters  90 

.  MAILING  TUBES,  heavy  pasteboa.  J,  I%xl2  inches Per  dozen  .35 

MALLET,  Rawhide,  round,  6-ounce 1.10 

MALLET,  Wood,  round,  3-inch  face 25 

MANOMETERS,  see  Gages. 

.  MATCHES,  Swedish  Safety,  in  packages  of  12  boxes Per  package  .16 

MATRASSES,  see  Blowpipe  Apparatus. 

MATRASS  HOLDER,  see  Blowpipe  Apparatus. 

MAUL,  of  iron,  with  wooden  face  and  hickory  handle.  Length  of  handle,  2  feet;  diameter  of 
head,  3%  inches;  weight.  6  pounds 1.40 

MEASURES,  Calipers,  see  Calipers. 


336 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8404. 


8390. 
8392. 


MEASURES,  Dry,  Wood,  iron  bound.     Set  of  5  pieces,  1,  2  and  4  quarts,  1  peck, 

MEASURES,  Liquid,  Agateware,  with  spout  and  handle. 

Capacity,  pints 1  2 

Each  . .' 40  .50 

8394.    MEASURES,  Liquid,  Polished  Copper,  tinned  inside,  with  spout  and  handle. 


bushel.    $1.60 


Capacity,  pints 
Each 


1 
1.15 


2 
1.50 


4 
.70 

4 
1.90 


8 
.80 


2.70 


8396.    MEASURES,  Liquid,  Tinned  Iron,  with  spout  and  handle. 

Capacity,  pints '/-i  1  2  4  8 

Each 10  .15  .20  .30  .40 

8400.     MEASURES,  Liquid,  Metric,  polished  brass,  standard  form. 

Capacity,  liters 0.01          0.02         O.Oo         0.1         0.2         0.5  1  2 

Each 25  .30  .40          .50         .60         .70         .80         .90 

8402.     MEASURES,  Liquid,  Metric.     Same  as  No.  8400.    Set  of  seven  pieces,  0.01  liter  to  1  liter.       3.00 
8404.     MEASURES,  Liquid,  Metric.     Same  as  No.  8400.    Set  of  eight  pieces,  0.01  liter  to  2  liters.       3.90 
Note:     "Standard  Form"  is  that  in  which  the  diameter  equals  half  the  height. 
MEASURES.  Metric  Rules,  see  Scales. 
MEASURING  MICROSCOPE,  see  Microscopes. 
MECHANICAL  STAGE,   sec  Microscope  Accessories. 

8410.    MELTING  POINT  TUBE,  Thiele's,  of  hard  glass  .  1.00 

MERCURY  BULBS,  see  No.  1902. 

METALLOGRAPHIC  APPARATUS 

BLAST.  Hot  Air  for  drying  freshly  polished  specimens,  see  No.  1388. 
DESICCATOR  CABINET  for  storing  polished  specimens,  see  No.  3790. 
FURNACES  for  heat  treating,  sec  general  heading  Furnaces. 

8430.  GRINDING  MACHINE,  Endless  Belt  Type,  for  rough  grinding,  for  large  or  small  metal  speci- 

mens. Width  of  belt,  4  inches;  dimensions  of  flat  top  of  machine,  6x10  inches;  intended 
speed  of  operation,  about  1,000  r.p.m.  Complete  as  illustrated  with  automatic  belt  tightener, 
tight  and  loose  pulleys,  belt  shifter  and  three  grinding  belts  of  different  degrees  of  fine- 
ness    $35.00 

In  ordering,  kindly  state  whether  alundum  or  carborundum  belts  are  desired.  The  former 
should  be  used  for  steel,  malleable  iron,  drop  forgings,  etc.;  the  latter  for  brass,  bronze,  cast 
iron  and  v/rought  iron. 

8431.  EXTRA  GRINDING  BELTS  for  No.  8430. 

No A  B 

Degree  of  fineness coarse  medium 

Each    70  .70 

See  note  under  No.  8430. 


C 

fine 
.70 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO, TJ.  S.  A. 


337 


No.  8435. 


GRINDING  MACHINE,  Reciprocating  Type,  for  fine  grinding,  designed  to  replace  hand  grind- 
ing with  fine  emery  papers  from  No.  0  to  No.  0000,  preliminary  to  polishing.  The  machine 
consists  of  two  carriages  which  move  slowly  in  a  horizontal  plane  with  reciprocating  mo- 
tion. Each  carries  a  glass  plate  5x2  inches  to  which  emery  papers  may  be  fastened  by  fil- 
tered adhesive.  Complete  with  four  glass  plates  covered  with  special  metallographic  emery 
paper  of  different  degrees  of  fineness. 

S434.    With  tight  and  loose  pulleys  and  belt  shifter,   for  belt  drive 65.00 

8435.    With  direct  connected  motor,  with  worm  gear  drive. 

No A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    115.00       115.00       115.00       115.00 

8438.     EMERY  PAPERS.  Metallographic,  specially  prepared  for  Metallographie  purposes. 

No 0000  000  00  0  1  1G 

Per  quire 2.30          2.00          1.80          1.75          1.70          1.70 

S44i>.    HACK  SAW.  Power,  with  tension  device  to  produce  pressure  on  the  saw  during  the  draw  cut. 
Capacity  of  vise,  4x4  inches;  length  of  blade,  12  inches;  size  of  pulley,  13x2%  inches;  speed 
of  operation,  60  to  90  r.p.m.;   net  weight,  110  pounds;  shipping  weight,  120  pounds..    20.00 
HARDNESS  TESTING  APPARATUS,  see  general  heading  Hardness  Testers. 
MICROSCOPES.  Metallurgical,  write  for  information. 

PHOTOMICROGRAPHIC  APPARATUS  for  Metallography,  write  for  information. 
8496.  POLISHING  MACHINES.  Automatic  Spray  Type,  for  the  final  polishing  of  metal  specimens  by 
means  of  levigated  alumina.  The  machine  consists  of  a  motor  mounted  in  a  polished  oak 
cabinet,  to  which  is  attached  a  hard  rubber  horizontal  polishing  disk,  6  inches  in  diameter, 
covered  with  special  broadcloth.  A  small  bronze  pump,  driven  by  the  motor,  pumps  alumina 
polishing  liquid  from  a  reservoir  in  the  cabinet  and  forces  it  through  the  spray  nozzle  upon 
the  center  of  the  polishing  disk.  The  fineness  of  the  spray  is  adjustable  by  a  valve.  The 
reservoir  can  be  refilled  from  the  outside.  A  special  stirring  device  prevents  precipitation 
of  the  alumina.  Dimensions  of  the  cabinet,  22x18  inches.  Complete  as  described  with  one 
bottle  of  polishing  liquid. 

No A  B  C  D 

A.C.  D.C 

For  volts     110  220  110  220 

Each    $150.00      150.00       150.00       150.00 

S497.     POLISHING  CLOTH  COVERS  for  No.  8496,  cut  to  correct  size per  six     3.00 


338 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8512. 


No.  F781. 


No.  8510. 


8498.  LEVIGATED  ALUMINA  for  use  with  No.  8496,  specially  prepared  for  obtaining  a  correct  and 
rapid  finish;  in  powder  form. 

No A  B  C 

For  use  with steel  and  hard     medium  hard  soft 

metals  metals  metals 

Per  ounce .95  1.60  2.30 

PYROMETERS,  see  general  heading  Pyrometers. 
MERCURY  STILL,  Hulett's,  see  Distilling  Apparatus. 

8510.  METEOROLOGICAL  SET,  Universal,  a  complete  set  of  meteorological  instruments  suitable 
for  a  beginner,  and  of  such  a  quality  as  to  give  satisfaction.  The  set  comprises  a  5  inch  metal 
case  aneroid  barometer,  8  inch  boxwood  thermometer  with  F.,  R.  and  C.  scales,  8  inch  maximum 
and  minimum  (Six's)  thermometer  with  magnet,  8  inch  Mason's  wet  and  dry  bulb  hygrometer 
with  boxwood  scale,  5  inch  Howard  rain  gauge,  and  a  calendar  for  keeping  a  record  of  the 
instruments  in  the  set.  Packed  in  neatly  finished  box 30.00 

8512.  METEOROLOGICAL  SHELTER.  The  latest  pattern  Weather  Bureau  Instrument  Shelter. 
(Weather  Bureau  Bulletin  No.  459.)  Sufficiently  large  to  hold  Barograph  or  Thermograph  and 
the  two  instruments  shown  in  the  cut.  Made  of  best  quality  white  pine  wood,  painted  three 
coats  lead  paint,  swing  door  with  lock  and  key.  Complete  with  screws  for  mounting.  Shipped 
"knocked  down" 35.00 

WEATHER  FORECAST  CHART,  see  No.  14390. 

For  other  Meteorological  Instruments,  see  Anemometers,  Barometers,  Gages,  Hygrometers,  Sun- 
shine Recorders,  Thermometers  and  Weather  Instruments. 

METERS,  Gas,  see  Nos.  6786  and  6956. 

F781.  METRONOME,  for  counting  seconds  and  fractional  parts  of  a  second,  etc.  In  fine  mahogany 
case  5.00 

F782.  METRONOME.  Same  as  No.  F781,  but  with  adjustable  bell  attachment.  The  bell  may  be  made 
to  strike  every  second  beat,  third  beat,  fourth  beat  or  sixth  beat 7.00 

F783.  METRONOME,  with  electrical  connection.  No.  F781  Metronome  fitted  with  mercury  cups  and 
binding  posts  for  tracing  time  on  a  revolving  drum  in  connection  with  a  time  marker.  Makes 
contact  at  each  beat  of  the  pendulum 18.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


339 


MICROSCOPES 


We  desire  to  advise  our  friends  and  patrons  that  we  are  agents  for  the  celebrated  Spencer  Micro- 
scopes, manufactured  by  the  Spencer  Lens  Company,  and  carry  a  complete  stock  of  all  Microscopes 
listed  herein.  The  Spencer  Microscopes  are  of  recent  design  and  contain  many  important  features 
not  possessed  by  any  other  microscope  in  the  world.  The  Spencer  lenses  are  guaranteed  against  all 
defects.  We  will  be  glad  to  send  any  one  of  the  Spencer  Microscopes  to  responsible  persons  for  com- 
parison, grade  for  grade,  with  any  objective  or  stand  of  American  or  European  manufacture,  with 
the  utmost  confidence  that  the  Spencer  will  be  found  to  be  unsurpassed  by  any  and  only  equaled  by 
few.  We  unhesitatingly  recommend  the  Spencer  Microscopes  as  representing  better  values  than  any 
other  instrument  on  the  market. 


No.  8532. 


Diagram  of  Side  Fine 
Adjustment  "D." 


8532.     MICROSCOPE.  Spencer  No.  44,  the  most  popular  of  all  Spencer  Microscopes.     Many  hundred 
are  in  daily  use  in  medical,  educational  and  general  laboratories. 

The  Body  Tube  is  standard,  taking  standard  objectives  and  oculars. 

The  Arm  is  strong  and  very  graceful,  fitted  with  the  patented  side  fine  adjustment  "D," 
possessing  many  exclusive  features.  It  has  but  two  bearing  surfaces  and  three  working 
parts.  The  patented  one-piece  construction  bearing  carries  the  solid  steel  screw.  This  screw, 
with  no  less  than  twenty  threads  engaged  even  at  the  limit  of  its  motion,  has  a  heavy 
flange,  F,  working  against  the  lever.  L.  When  the  screw  is  turned  in  such  a  direction  as  to 
carry  F  forward,  the  lever  is  so  swung  as  to  raise  the  body  tube.  The  reverse  motion  per- 
mits the  tube  to  be  lowered  under  the  influence  of  the  spring.  The  focusing  buttons  at  either 
end  of  this  screw  travel  laterally  and  serve  as  a  visible  index  of  the  center  of  the  fine  adjust- 
ment action.  Steel  pins  in  the  heads  form  positive  stops  at  either  end  of  the  excursion.  The 
direction  in  focusing  is  the  same  with  both  fine  and  coarse  adjustments.  One  revolution 
moves  the  tube  0.2  mm. 

The  Stage,   112x108  mm,  is  completely  covered  with  hard   rubber,   vulcanized    directly   to   the 

stage  plate.     Distance  is  80  mm  from  optical  axis  to  arm. 
The  Substage  is  standard  quick-screw  form. 

The  Down-Swing  Condenser  Mounting  may  be  supplied  at  $7.50  additional. 
Furnished  in  hardwood  cabinet  with  lock  and  kev. 


Xo 44A  44B             440  44D 

Abbe  condenser ....            ....  .... 

Xosepiece     double          ....  double 

Objectives,  equivalent 

focus,   mm 16,4  16,4  16,4  16,4 

Achromatic  oculars. .         Iflx  lOx  6x.  lOx  6x,  lOx 

Each    $44.50  49.25  46.25  51.00 


44E  44F  44H 

N.  A.  1.20  N.  A.  1.20  X.  A.  1.20 

double         double        triple 


16,4 


58.25 


16,4 

6r,  lOx 

60.00 


16.4.1.8 
Oil  imm. 

<">x,  lox 
90.00 


340 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


8536, 


8540. 


No.  8536.  No.  8540. 

MICROSCOPE,  Spencer  No.  64.  A  standard  microscope  for  general  biology;  used  in  hundreds  of 
laboratories. 

The  Body  Tube  is  our  standard,  37  mm  in  diameter,  taking  standard  objectives  and  oculars. 

The  Arm  and  its  side  fine  adjustment  "D"  are  identical  with  those  of  Microscope  No.  8532. 
This  adjustment  is  patented,  is  exceedingly  durable,  will  withstand  very  hard  usage  and  not 
develop  lost  motion.  (See  description  and  diagram  illustration  under  No.  8532.)  It  travels 
laterally,  giving  an  instant  visible  index  of  the  position  of  the  adjustment  relative  to  the 
total  excursion.  Steel  pins  in  heads  of  buttons  produce  an  absolute  stop  at  either  end  of 
excursion,  preventing  jamming  or  binding  of  screw.  There  are  but  two  bearing  surfaces  and 
three  working  parts.  The  main  bearing  is  made  of  one  single  piece.  One  revolution  moves 
the  tube  0.2  mm.  Adjustment  ceases  to  work  when  objective  comes  in  contact  with  slide. 

The  Stage,  112x108  mm,  is  completely  covered  with  hard  rubber,  vulcanized  directly  to  the 
stage  plate.  Beneath  the  stage  is  an  iris  diaphragm  operated  by  a  knurled  wheel,  62  mm  in 
diameter.  Abbe  Condenser  is  supplied  when  ordered,  and  is  fitted  in  a  simple  spiral  focusing 
substagc  ring.  Distance  is  80  mm  from  optical  center  to  arm. 

Furnished  in  hardwood  cabinet,  with  lock  and  key. 


No 64A 

Abbe   condenser 

Nosepiece     

Objectives,   equivalent 

focus,    mm 16,4 


64B 


double 


16,4 


64C 


16,4 


64D 


double 


16,4 


64E 

N.  A.  1.20 
double 

16,4 


64F  64H 

N.  A.  1.20  N.  A.  1.20 
double 


triple 


16,4 


Achromatic    oculars  .  .        lOx 
Each    $36.00 


16,4,1.8 
oil  imm. 
6x,  lOx 
85.00 


lOx  6x,  lOx       6x,  lOx  lOx  6x,  lOx 

40.75          37.75  42.50  49.75  51.50 

MICROSCOPE,  Spencer  No.  65.  This  instrument  is  similar  to  No.  8536,  except  for  the  shape  of 
arm  and  the  type  of  fine  adjustment.  It  is  highly  recommended  for  general  laboratory  work 
and  is  a  very  high  grade  microscope  at  moderate  cost. 

The  Body  Tube  is  our  standard,  taking  standard  objectives  and  oculars. 

The  Arm  is  fitted  with  the  sensitive  and  accurate  lever  type  fine  adjustment.  One  revolution 
moves  the  tube  0.5  mm.  The  action  ceases  to  work  when  the  objective  comes  in  contact 
with  slide. 

The  Stage,  112x108  mm,  is  completely  covered  with  hard  rubber,  vulcanized  directly  to  the 
stage  plate.  Distance  is  80  mm  from  optical  axis  to  arm.  Beneath  the  stage  is  an  iris  dia- 
phragm operated  by  a  knurled  ring. 

A  Substage  Ring,  with  spiral  slot  for  focusing  the  Abbe  condenser,  is  supplied  when  ordered 
or  may  be  applied  at  any  time  without  returning  the  microscope  to  the  factory.  An  auto- 
matic device  locks  the  upper  iris  open  when  condenser  is  in  place.  The  standard  mirror,  50 
mm  in  diameter,  plane  and  concave,  is  supplied  on  the  usual  swinging  mirror  bar. 

Furnished  in  hardwood  cabinet  with  lock  and  key. 


double        double 


No 65A  65B  65C  65D 

Abbe  condenser ....  ....  .... 

Nosepiece     double  .... 

Objectives,   equivalent 

focus,    mm 16,4  16.4  16,4  16,4              16,4 

Achromatic    oculars  . .       lOx  lOx  6x,  lOx  6x,  lOx           lOx 

Each    33.00  37.75  34.75  39.50           46.75 


65E  65F  65H 

N.  A.  1.20  N.  A.  1.20  N.  A.  1.20 


double 
16,4 


triple 


16,4,1.8 
oil  imm. 
6x,  lOx  6x,  lOx 
48.50  82.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


341 


8544. 


-' 


S564. 


8565. 
S566. 

S56  . 
8568. 
8569. 

8570. 
8572. 


8573. 


No.  8564. 


No.  8544. 


No.  8560. 


No.  8572. 


MICROSCOPE,   Spencer  No.  66.     An  excellent     instrument    for    general    laboratory    work.       A 

splendid  microscope  at  moderate  cost. 

The  Body  Tube  is  our  standard,  taking  standard  objectives  and  oculars. 

The  Ann  is  the  handle  arm  type  with  lever  fine  adjustment  "C. "    One  revolution  of  the  micro- 
meter screw  moves  the  body  tube  0.5  mm.  The    action    ceases    to   work    when    the    objective 

comes  in  contact  with  slide. 
The  Stage,   103x95  mm,  is  completely  covered  with   genuine  hard   rubber,   vulcanized   directly 

to  the  stage  plate.     Distance  is  60  mm  from  optical  axis  to  base  of  arm.    The  iris  diaphragm 

is  operated  by  a  knurled  ring  just  beneath  the  stage. 
A  Substage  King,  for  attaching  and  focusing  the  Abbe  condenser  by  means  of  a  spiral  slot,  is 

supplied  when  the  condenser  is  ordered  or  may  be  added  at  any  time. 
The  Mirror  is  plane  on  one  side,  concave  on    the    other,    50    mm   in    diameter,    mounted    on    a 

swinging  bar. 
Furnished  in  hardwood  cabinet,  with  lock  an  1  key. 


No 66A 

Abbe  condenser 

Nosepiece     

Objectives,  equivalent 

focus,   mm 16.4 


titiB 


double 
16,4 


66C 


16,4 


66D 


66E  66F  66H 

X.  A.  1.20  X.  A.  1.20  X.  A.  1.20 


double        double        double 


triple 


16,4 


16,4 


16,4 


Achromatic    oculars  . .       lOx 
Each    $33.00 


16.4.1.8 
oil  imm. 
6x,  lOx 
82.00 


lOx          6x, lOx        6x, lOx  lOx  6x, lOx 

37.75  34.75  39.50  46.75  48.50 

MICROSCOPE.  Brinell,  see  Hardness  Testers. 

MICROSCOPE,  Demonstration.  With  the  exception  of  the  tube,  this  stand  is  made  entirely  of 
aluminum,  thus  making  it  very  light.  This,  with  the  convenient  handle,  makes  it  superior  to 
all  others  for  handing  from  person  to  person  during  class  demonstrations.  The  objective  is 
accurately  and  easily  focused  by  a  spiral  movement  which  is  so  arranged  that  the  objective 
may  be  securely  fastened  in  any  focus.  The  objective  is  always  in  sight,  thereby  being 
easier  to  focus,  and  to  exchange  for  another.  The  slide  is  placed  upon  the  stage  as  in  any 
other  microscope  and  there  is  no  danger  of  disturbing  the  cover  glass.  Furnished  with  8x 
eyepiece  and  16  mm  objective 13.50 

MICROSCOPE,  Dissecting,  Barnes,  with  hardwood  polished  base,  movable  glass  stage,  mirror, 
and  two-lens  magnifier.  Fine  screw  and  also  sliding  adjustment.  Block  is  provided  with 
pocket  for  holding  dissecting  tools 2.75 

MAGNIFIER  only  of  Xo.  8564,  without  holder 90 

HOLDER  only  of  Xo.  8564.  with  vertical  rod   *4   inch  in  diameter 25 

MAGNIFIER'  AND  HOLDER  of  NO.  S564.  complete  1.15 

BLOCK  only  of  Xo.  8564  with  mirror  and  stage,  but  without  magnifier  and  holder 1.50 

GLASS  MIRRORS  only  of  Xo.  8564 each        .09 

per  dozen       .90 
GLASS  STAGES  only  of  Xo.  8564 each         09 

per  dozen       .90 
MICROSCOPE.   Dissecting,    same   block   as   Xo.  8564,  fitted  with  12x  Doublet  Magnifier  which 

gives  perfect   definition 3  QQ 

Note: — Other  size  Doublets  may  be  furnished,  if  desired,  in  place  of  the  12x  at  the  same  price. 
HOLDER  only  of  Xn.  v"2  for  doublet  magnifiers     30 


342 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  8577-80  (front  view), 


Nos.  8577-80  (rear  view). 


8577. 
8578. 
8579. 
8580. 
8584. 


8588. 


No.  8584. 


No.  8588. 


MICROSCOPE,  Improved  Dissecting.  The  parts  of  the  block  at  either  side  of  the  mirror  are 
cut  out  to  allow  light  from  the  sides  to  strike  the  mirror,  thus  doing  away  with  the  neces- 
sity of  the  operator  facing  the  source  of  light  in  order  that  the  light  may  strike  the  mirror. 
The  block  is  hollow  beneath  and  back  of  the  mirror,  forming  a  convenient  receptacle  for  dis- 
secting tools  and  lenses.  This  is  closed  by  a  door  which  is  hinged  at  the  lower  edge  of  the 
block.  This  is  most  convenient  because  it  is  not  necessary  to  remove  the  specimen  from  the 
stage  or  the  lens  from  the  holder  when  a  new  dissecting  tool  or  lens  is  wanted.  The  lens  is 
held  in  an  arm  which  permits  movement  from  side  to  side  and  provides  for  focusing.  A 
black  and  white  metal  background  is  furnished  with  each  instrument. 

MICROSCOPE,   Dissecting,   with   9x   Doublet $3.30 

MICROSCOPE,  Dissecting,  with  12x  Doublet    3.30 

MICROSCOPE,  Dissecting,  with  9x  Triple  Aplanat 6.50 

MICROSCOPE,  Dissecting,  with    12x    Triple    Aplanat 6.50 

MICROSCOPES,  Spencer  Dissecting.  An  extremely  well  made,  thoroughly  serviceable  and  con- 
venient instrument  at  a  very  moderate  cost.  It  is  made  with  special  reference  to  stability, 
ease  of  manipulation  and  durability.  The  focusing  is  accomplished  by  diagonal  rack-and- 
pinion,  moving  a  solid  brass  rod,  whose  bearings  provide  great  steadiness  and  a  very  smooth 
movement  of  long  range,  so  that  lenses  of  long  focus  may  be  used.  Two  milled  pinion  heads 
allow  either  hand  to  be  used  in  focusing.  An  extra  large  stage  is  provided,  covered  with  a 
heavy  polished  glass  plate,  75  mm  x  100  mm,  easily  removed.  The  jointed  lens  arm  permits 
the  lens  to  be  used  over  any  part  of  the  stage.  Plane  and  concave  mirror  is  furnished.  The 
hand  rests  are  of  metal,  detachable.  In  hardwood  cabinet. 

No A 

Number  of  lenses 1 

Type  of  lens doublet 


B 

2 
doublet 


C 
1 

triple 
aplanat 

9 

27.8 
24.5 
14.25 


D 

2 

triple 
aplanat 

6,  12 

41.6,  20.8 

36.8,  18.4 

18.50 


Magnifying  power,  diameters 9  6,  12 

Equivalent  focus,  mm 27.8  41.6, 20.8 

Working   distance,   mm 15  22, 12 

Each    10.75  11.75 

MICROSCOPES,  Spencer  Dissecting,  similar  in  construction  to  No.  8584,  with  the  exception  that 
instead  of  the  rack-and-pinion  focusing  adjustment  it  is  equipped  with  a  friction  sliding  tube 
adjustment.  A  button  at  the  side  of  the  pillar  moves  a  strong  cylindrical  lens  arm  support, 
whose  bearings  extend  the  whole  length  of  the  inner  surface  of  the  hollow  pillar,  giving  a 
steady,  smooth  movement.  Without  hand  rests,  in  hardwood  cabinet. 


No A 

Number  of  lenses 1 

Type   of   lens doublet 


Magnifying  power,  diameters. 

Equivalent  focus,  mm 

Working   distance,   mm 

Each    . 


9 
27.8 

15 
9.00 


B 

2 
doublet 

6,12 

41.6,  20.8 

22,12 

10.00 


C 
1 

triple 
aplanat 

9 

27.8 
24.5 
12.25 


D 

2 

triple 
aplanat 

6,  12 

41.6  20.8 

.36.8,  18.4 

16.50 


8589.     METAL  HAND-RESTS  for  use  with  No.  8588 , per  pair        .75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


343 


No.  F585. 


No.  8610. 


No.  F586. 


F584.  MICROSCOPE,  Measuring,  Mounted.  A  plain  microscope  without  micrometer.  Fitted  with  fixed 
cross  hairs,  tube  and  clamp  collar.  Diameter  of  tube,  22  mm.  Magnification,  about  30  diameters. 

Complete  with  No.  F591  Support §25.50 

F585.  MICROSCOPE,  Measuring.     Same  as  No.  F584,  without  support 13.50 

F586.  MICROSCOPE,  Measuring,  Mounted.  Similar  to  No.  F584,  but  with  eyepiece  micrometer.  This 
micrometer  is  of  new  design  and  is  guaranteed  to  be  of  the  highest  order  of  workmanship  and 
accuracy.  The  pitch  of  the  micrometer  screw  is  0.25  mm,  and  its  range  is  10  mm;  since  the 
micrometer  head  is  divided  into  100  parts  it  is  possible  to  read  to  0.0025  mm  at  the  cross  hairs. 
Since  the  magnification  of  the  objective  is  about  3  diameters  this  is  equivalent  to  a  reading  of 
about  0.0008  mm  on  the  object  being  measured.  Total  magnification,  about  30  diameters.  Com- 
plete with  No.  F591  Support 45.00 

F587.  MICROSCOPE,  Measuring.     Same  as  No.  F586,  without  support 33.00 

F591.  MICROSCOPE  SUPPORT.  A  heavy,  adjustable  support  for  measuring  microscopes.  The  micro- 
scope can  be  held  rigidly  in  any  position,  as  all  joints  can  be  tightly  clamped.  The  base  is 
sufficiently  heavy  to  insure  the  stability  required  in  a  microscope  used  for  accurate  measure- 
ments. The  top  of  the  base  is  machined,  so  as  to  enable  the  attaching  of  stages  or  other  acces- 
sories. The  diameter  of  the  horizontal  and  vertical  arms  is  the  same  and  the  microscope  may 
be  clamped  in  a  horizontal  position,  so  as  to  read  a  vertical  scale.  Vertical  range  about  9  cm; 
horizontal  range  about  12  cm.  Illustration  shows  Microscope  No.  F587  used  in  connection  with 

the  support.     Support  only,  without  microscope 12.00 

MICROSCOPES,  Metallurgical,  see  Metallurgical  Apparatus. 
MICROSCOPES,  Projection,  see  Catalog  F  of  Physical  Apparatus. 


MICROSCOPE  ACCESSORIES 

(Alphabetically  Arranged.) 

8610.  ABBE  SUBSTAGE  CONDENSER.  In  order  to  secure  the  best  results  with  objectives  of  high 
power,  an  Abbe  Condenser  must  be  used.  The  condenser  illustrated  has  an  aperture  N.  A. 
1.20  and  meets  all  the  requirements  of  practical  work.  It  is  fitted  with  an  iris  diaphragm 
beneath  to  modify  the  amount  of  light,  and  is  also  provided  with  a  ring  beneath  the  iris  to  hold 
a  blue  glass  for  cutting  out  the  yellow  rays  of  artificial  light;  or  to  hold  a  center  stop  which  to 
some  extent  will  provide  dark  field  illumination.  The  mounting  is  like  the  cut  for  the  friction 
collar  substages  or  is  swung  on  the  arm  of  the  down-swing  condenser  mounting 9.00 

8614.  CAMERA  LUCID  A,  Abbe's,  designed  to  satisfy  the  demands  of  the  serious  laboratory  worker. 
It  has  a  very  large  mirror,  70  mm  x  105  mm,  which  is  supported  on  adjustable,  graduated 
mirror  bar.  "  Its  unique,  compact  mounting  makes  it  possible  to  place  the  eye  sufficiently 
close  to  the  prism  so  that  the  pupil  takes  in  all  of  the  divergent  rays  coming  from  the  whole 
of  the  field  of  the  ocular,  making  the  field  appear  as  large  and  the  object  very  nearly  as 
distinct  as  when  viewed  without  the  camera.  The  prism  is  so  mounted  that  the  opening  in 
the  silvering  can  be  lowered  in  the  case  of  the  higher  power  oculars,  or  raised  with  the  lower 
powers  until  it  comes  to  the  exact  focus  of  the  ocular.  The  prism  can  be  so  centered  by 


344 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  8630.  No.  8636 


No.  8640. 


No.  8634. 


CAMERA  LUCID  A,  Abbe's,  Continued. 

two  concentric  screws  that  the  field  is  free  from  color  to  the  extreme  edge.  The  light  from 
it  is  modified  by  a  series  of  smoked  screens  of  different  densities  which  may  be  revolved  in 
and  out  of  line  between  the  mirror  and  the  prism.  It  is  made  for  the  standard  size  micro- 
scope tubes,  now  in  use  by  practically  all  American  and  European  makers.  Complete  in 

hardwood  case   $20.00 

8616.  CAMERA  LUCIDA,  same  as  No.  8614,  with  the  exception  that  the  prism  is  permanently  cen- 
tered at  the  factory  and  that  there  is  no  means  for  modifying  the  light  from  the  ocular. 
The  prism  is  the  same  size  and  mounted  in  a  similar  way.  There  are  no  loose  parts  to  get 
out  of  place  when  the  prism  is  moved  in  and  out  of  the  optical  center.  Complete  in  hard- 
wood case  12.00 

8630.  EYEPIECES,  Huyghenian.  In  arranging  the  focal  distance  of  the  Spencer  eyepieces,  the 
method  has  now  been  adopted  of  marking  them  with  figures  that  indicate  in  each  case  how 
many  times  the  eye-piece  enlarges  the  objective  image,  projected  the  distance  of  distinct  vi- 
sion (250  mm  or*  10  inches).  For  example,  the  4x  eyepiece  magnifies  the  objective  image  four 
times,  and  the  magnification  of  the  8x  eyepiece  will  be  twice  as  great  under  similar  condi- 
tions. A  lOx  ocular  now  takes  the  place  of  the  old  8x  and  a  5x  takes  the  place  of  the  4x, 
the  old  designation  being  based  on  the  magnifications  of  the  image  projected  the  distance  of 
the  optical  tube  length,  160  mm.  The  eyepieces  are  made  to  fit  the  standard  tube  of  the 
Koyal  Microscopical  Society. 

No A 

Magnifying  power,  diameters 4 

Equivalent  focus,  mm 62.5 

Equivalent    focus,    inches 2ty 

Each    1.75 

8634.     EYEPIECE,  Micrometer,  with  movable  scale  5   mm  in  length,   divided   into 

The  graduated  drum,  divided  into  100  divisions,  moves  the  scale  %  mm  for  each  revolution, 
thus  permitting  readings  to  be  made  to  }4oo  nim-  This  instrument  has  a  decided  advantage 
over  the  filar  micrometer  in  that  it  is  not  necessary  to  move  the  cross  hairs  the  entire  length 

of  the  object.     Complete  with  case 30.00 

8636.  EYEPIECES,  Micrometer,  with  fixed  scale,  providing  a  convenient  method  of  using  the  micro- 
meter scale.  The  eye  lens  is  mounted  in  an  adjustable  sleeve  permitting  the  scale  to  be 
brought  into  exact  focus.  Scale  graduated  to  5  mm  in  I/JOQ  mm  divisions. 

No A 

Magnifying  power,  diameters 6 

Each    5.00 

8640.  ILLUMINATOR,  Dark  Pield,  for  use  on  any  microscope.  The  condenser  is  mounted  in  a  solid 
piece  of  brass  with  slots  at  the  end  for  the  stage  clips  of  the  microscope.  It  permits  the  use 
of  slides  on  the  top  surface.  The  top  surface  of  the  condenser  is  provided  with  a  little  ring 
by  which  it  may  be  carefully  centered.  Direct  sunlight  may  be  used.  Fairly  good  results 
may  be  obtained  by  using  a  Welsbach  light,  but  the  best  source  of  light  is  the  electric  arc 
light.  No.  8682  Arc  Light  is  especially  constructed  for  such  work.  Complete  in  neat  case, 

including  special  diaphragm  for  1.8  mm  oil   immersion   objectives 10.00 

ARC  LAMP  for  use  with  No.  8640,  see  No.  8682. 


B 
9 

50 

2 

1.75 


C 
(i 
40 

1% 
1.75 


ID 

8 
30 

1% 
1.75 


E 
1(1 
25 
1 
1.75 


F 
12 
20 

A   I 

1.75 


mm   divisions. 


B 

10 
5.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


345 


No.  8656  (shown  in  use) 


No.  8656. 

8648.  ILLUMINATOR,  BULL'S-EYE~CONDENSER  for  the  illumination  of  opaque  objects  and  for 
throwing  parallel  rays  of  light  upon  the  mirror  from  an  artificial  source  in  ordinary  work 

with  transparent  objects.     Mounted  as  shown.     Diameter  of  lens,  75  mm $8.00 

S6oO.    IMMERSION  OIL,  Cedarwood,  in  1-ounee  vials per  vial       .36 

x<>56.  INCUBATOR,  Electric,  for  use  on  microscope  stages.  Especially  valuable  in  the  Widal  test,  for 
the  cultivation  of  bacteria,  yeasts,  spirochetes  and  tumor  cells,  and  for  the  observation  of 
malarial  parasites.  Dimensions,  3^x2x%  inch  over  all,  with  incubating  chamber  3xlx%  inch 
deep,  having  a  removable  glass  bottom,  consisting  of  a  regular  microscope  slide.  The  top  is 
a  piece  of  clear  mica  with  a  hole  cut  through  the  center  through  which  the  lens  is  passed.  A 
rubber  washer  is  provided  for  sealing  the  opening.  Complete  with  heater,  thermometer,  tem- 
perature regulator  for  any  temperature  from  80°  to  HOT.,  cord  and  special  plug  for  attach- 
ment to  any  regular  110-volt  electric  lamp  socket,  in  velvet  lined  case 18.00 

LAMPS  FOR  MICROSCOPY 

8662.  LAMPS,  Microscope,  Radio,  for  use  with  any  microscope.     Consists  of  a  sheet  metal  housing, 

nickeled  and  highly  polished,  6%  inches  in  height,  mounted  on  a  jointed  stand,  permitting 
adjustment  at  any  angle.  Complete  with  special  40  watt  Radio  globe  with  concentrated  metal 
filament,  one  each  Rav  Filter  Blue  and  White-Ground,  6  feet  of  cord  and  connecting  plug. 

No A  B 

For  volts 110          220 

Each 8.00        8.50 

8663.  LAMPS,  Microscope,  Radio,  same  as  Xo.  8662,  but  with  Daylite  Filter  instead  of  Blue  Filter. 

No ". A  B 

For  volts 110  220 

Each    10.00  10.50 

8666.  LAMPS.  Microscope.  Radio,  for  Darkfleld  Illumination,   similar  to  No.   8662,   but   with  special 

Radio-Nitrogen  Globe  for  high  power  illumination  in   dark-field  work.     Complete   with   Blue 

and  White  Ground  Filters,  connecting  cord  and  plug.      No A  B 

For  volts 110          220 

Each    10.00      15.50 

Note: — No.  8666B  includes  rheostat  for  reducing    voltage    to    safe    amount    for    Radio-Nitrogen 
Globe. 

8667.  LAMPS,  Microscope,  Radio,  same  as  No.  8666,  but  with  Daylite  Filter  instead  of  Blue  Filter. 

No '. A  B 

For  volts 110          220 

Each   12.00       17.50 

Note: — No.  8667B  rheostat. 

8670.  ADAPTER  for  Nos.  8662  and  8663,  to  permit  a  Radio-Nitrogen  Globe  to  be  used  for  dark-field 

work    1.50 

8671.  RADIO  GLOBE,  40  watts,  110  volts,  for  Nos.   8662  and   8663 1.50 

^',72.     RADIO  GLOBE,  40  watts,  220  volts,  for  Nos.  8662   and  8663 2.00 

8673.  RADIO-NITROGEN  GLOBE,  100  watts,  110  volts,  for  Nos.  8666  and  8667 2.00 

8674.  RHEOSTAT,   for  use  with  Radio-Nitrogen  Globe  No.  8673  on  220  volt  circuit 5.00 

8675.  DAYLITE  FILTER  for  use  with  Radio  Lamps     2.50 

8676.  BLUE  FILTER  for  use  with  Radio  Lamps 75 

8677.  WHITE-GROUND  FILTER  for  use  with  Radio    Lamps 50 


346 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


8682. 


8683. 


8684. 

8685. 
8688. 


8689. 
8690. 
8691. 
8694. 


8695. 
8696. 

8697. 
8698. 

8699. 
8700. 

3701. 
8702. 
8703. 
8704. 


No.  8682. 


No.  8694. 


LAMP,  Hand-Peed  Arc,  the  most  powerful  light  source  for  microscopical  work.  It  may  be  run 
on  any  house  circuit,  either  A.C.  or  D.C.,  using  the  proper  rheostat.  The  carbons  may  be 
moved  independently  or  at  the  same  time.  A  window  is  provided  for  observing  the  arc.  The 
light  rays  are  focused  by  means  of  a  condenser  in  a  sliding  tube.  A  blue  glass  and  a  ground 
glass  are  provided,  to  fit  in  a  groove  in  front  of  the  condenser.  The  lamp  is  adjustable  as  to 
height  and  angle.  Complete  with  blue  and  ground  glass  filters,  cord  and  connecting  plug  but 

without  rheostat  or  carbons $18.00 

RHEOSTATS  for  No.  8682,  fixed  form,  5  amperes. 

No A  B 

For  volts 110          220 

Each    7.00      10.00 

EXTRA  CARBONS  for  No.  8682 each       .06 

per  dozen     .60 

DAYLITE  GLASS  AND  ADAPTER,  for  No.    8682 2.00 

LAMP,  Microscope,  Miniature  Electric,  small  but  very  efficient,  measuring  2x2x3  %  inches,  low 
enough  to  work  beneath  the  substage  condenser.  It  is  usually  used  in  this  position,  it  then 
being  necessary  to  swing  the  mirror  of  the  microscope  to  one  side.  The  back  and  base  of 
the  lamp  are  wood,  making  its  use  entirely  safe  for  laying  on  a  polished  desk  or  other  such 
surface.  The  frame  is  metal,  finished  with  permanent  crystal  black  which  is  very  durable. 
The  bulb  is  a  15-watt  gas-filled,  concentrated  filament,  and  may  be  used  directly  on  any  110- 
volt  circuit,  either  direct  or  alternating.  It  may  be  used  on  220-volt  current  with  Eheostat 
No.  8691.  A  metal  reflector  behind  the  bulb  concentrates  the  light  and  no  light  can  escape 
except  through  the  single  opening.  The  intensity  of  illumination  is  ample  for  the  use  of  1.8 
mm  oil  immersion  objective  and  lOx  ocular.  Complete  with  five  feet  of  cord  and  attachment 

plug  with  bulb,  and  blue  and  ground  glasses     4.25 

LAMP,  Microscope,  same  as  No.  8688,  but  with  Daylite  glass 4.75 

EXTRA  BULBS  for  Nos.  8688  and  8689 each      1.25 

RHEOSTAT  for  use  in  series  with  Nos.  8688  and  8689  on  220-volt  circuit 3.00 

LAMP,  Microscope.  Spencer  No.  370,  adjustable  in  height  and  angle,  and  fitted  with  standard 
pear-shaped,  gas-filled  bulb,  usable  on  any  110-volt  circuit.  The  bulb  is  used  end-on,  with  a 
reflector  behind  it,  giving  ample  illumination  for  1.5  mm  oil  immersion  objectives  and  high 
power  oculars.  Very  serviceable  for  illuminating  opaque  objects  and  for  work  with  a  binoc- 
ular microscope.  Complete  with  five  feet  of  cord  and  attachment  plug,  key  socket,  and  with 
75-watt  110-volt  blue  glass  gas-filled  Mazda  bulb.  Finished  in  durable  crystal  black .  .  9.00 

EXTRA  BULB  for  No.  8694,  75-watt  110-volt,  blue  glass 1.00 

LAMP,  Microscope,  same  as  No.  8694,  but  with  100-watt  110-volt  blue  glass  gas-filled  Mazda 
bulb  9.75 

EXTRA  BULB  for  No.  8696,  100-watt  110-volt,  blue  glass 1.65 

LAMP,  Microscope,  same  as  No.  8694,  but  with  75-watt  110-volt  clear  glass  gas-filled  Mazda 

bulb,  fitted  with  condenser  and  with  blue  and  ground  glasses 10.00 

EXTRA  BULB  for  No.  8698,  75-watt  110-volt,  clear  glass 90 

LAMP,  Microscope,  same  as  No.  8698,  but  with  100-watt  110-volt  clear  glass  gas-filled  Mazda 

bulb,  fitted  with  condenser  and  with  blue  and  ground  glasses 10.5C 

EXTRA  BULB  for  No.  8700,  100-watt  110-volt,  clear  glass 1.25 

LAMP,  Microscope,  same  as  No.  8700,  but  with  Daylite  glass 12.50 

RHEOSTAT,  for  use  with  Nos.  8694  and  8698,  on  220-volt  circuit 5.00 

RHEOSTAT,  for  use  with  Nos.  8696,  8700  and  8702,  on  220-volt  circuit 6.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


347 


8708. 


8709. 
8710. 
8711. 
8714. 


8715. 
8716. 
S717. 
8718. 

S719. 
8720. 

$7  2-2. 


8730. 
8731. 
8734 


No.  8708. 


No.  8714. 


No.  8722. 


LAMP,  Microscope,  Spencer  Quadruple,  for  illuminating  several  microscopes  at  the  same  time. 
It  measures  6x6x9  inches,  and  is  entirely  constructed  of  metal,  finished  with  crystal  black 
which  is  exceedingly  durable.  It  is  fitted  with  a  100-watt  110- volt  Mazda  gas-filled  bulb,  ad- 
justable in  height.  A  single  lamp  will  supply  illumination  with  entire  satisfaction  for  four 
microscopes  at  a  distance  of  three  feet.  The  top  of  the  lamp  house  reaches  a  maximum 
temperature  of  about  140°F.,  serving  as  a  convenient  place  for  drying  specimen  slides  or 
keeping  paraffine  fluid.  Complete  with  standard  pear-shaped  Mazda  bulb,  five  feet  of  attach- 
ment cord,  snap  switch  and  plug,  four  ground  and'f our  blue  glasses $10.00 

LAMP,  Microscope,  same  as  No.  8708,  but  fitted  with  four  disks  of  Daylite  glass 13.00 

EXTRA  BULB  for  Xos.  8708-9,  100-watt,  110-volt    1.25 

RHEOSTAT  for  use  with  Xos.  8708-9,  on  220-volt  circuit 6.00 

LAMP.  Microscope.  Spencer  High  Power  Mazda,  designed  to  meet  the  demand  for  a  very  strong 
beam  of  light  without  the  objections  incident  to  an  arc.  Equipped  with  a  Mazda  gas-filled 
concentrated  filament  bulb,  an  independent  silvered  glass  reflector  of  the  proper  curve,  and 
a  pair  of  4^-inch  condensing  lenses  which  throw  a  converging  beam  of  light  out  through  the 
cone.  May  be  tilted  at  practically  any  angle.  An  excellent  instrument  for  use  with  the  dark 
field  illuminator,  and  for  photomicrography.  This  apparatus  with  an  attachable  section  and 
projection  objective,  forms  a  very  compact  and  efficient  stereopticon.  Complete  as  described 

with  250-watt,  110-volt  Mazda  bulb 20.00 

LAMP,  Microscope,  same  as  No.  8714,  but  with  400-watt   110-volt  Mazda  bulb 23.00 

DAYLITE  GLASS  AND  ADAPTER  for  Xos.  8714  and  8715 2.00 

RHEOSTAT  for  Xo.  8714,  on  220-volt  circuit     5.00 

RHEOSTAT  for  Xo.  8715,  on  220-volt  circuit 6.00 

EXTRA  BULB  for  Xo.  8714,  250-watt,  110-volt     4.00 

EXTRA  BULB  for  Xo.  8715,  400-watt,  110-volt 6.00 

DISTRIBUTING  BOX  for  Microscope  Lamps,  Spencer  Quadruple,  designed  to  meet  the  demand 
for  using  several  microscope  lamps  on  a  single  laboratory  table  from  a  single  incandescent 
electric  extension.  Made  of  metal,  fitted  with  five  porcelain  sockets.  The  current  is  supplied 
by  attaching  extension  cord  and  plug  to  the  top  socket.  It  may  quickly  and  easily  be  re- 
moved when  the  laboratory  table  is  desired  for  other  purposes 6.50 

MICROMETER,  Eyepiece,  a  glass  disk  with  finely  ruled  scale  to  be  laid  upon  the  diaphragm 

of  an  ordinary  Huyghenian  eyepiece,  with  a  5  mm  scale  divided  into  50  parts  (to  0.1  mm)  1.50 

MICROMETER!  Eyepiece,  same  as  Xo.  8730,  but  with  scale   divided  into  100  parts    (to   0.05 

mm)     • 1-50 

MICROMETER,  Stage,  for  standardizing  eyepiece  micrometers,  consisting  of  a  glass  object  slide 
with  finelv  ruled  scale.  1  mm  divided  into  100  parts 3.00 


348 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  8738. 


No.  8746. 


No.  8760. 


8738. 


8746. 


NOSEPIECES,  Eevolving,  of  the  circular  type,  dustproof.  They  are  valuable  accessories  when 
the  Microscope  is  supplied  with  more  than  one  objective,  as  they  save  time  and  prevent  dam- 
age and  loss  of  objectives.  When  ordered  with  the  microscope,  objectives  are  so  fitted  that 
they  are  par-focal. 

No A  B 

Style    double     triple 

Each    $4.75        6.75 

OBJECTIVES,  Achromatic,  made  in  accordance  with  methods  first  adopted  by  Professor  Abbe 
by  which  the  complete  mathematical  formulation  of  the  objective  is  first  perfected,  all  of  its 
elements  clearly  determined,  such  as  the  actual  indices  of  refraction  in  the  several  optical 
glasses  employed,  the  radii  of  the  curved  surfaces,  the  thicknesses  of  the  lenses  and  the  dis- 
tances of  separation,  so  that  this  work  of  prior  calculation  does  away  with  all  the  uncer- 
tainties of  experimental  optics.  A  greater  degree  of  perfection  and  a  much  greater  uni- 
formity are  thus  obtained  than  it  is  ever  possible  to  obtain  in  microscope  objectives  made  in 
other  ways.  In  these  calculations  especial  consideration  is  given  to  securing:  flatness  of  field, 
critical  definition,  resolution  and  long  working  distance.  All  objectives  are  corrected  for  a 
tube  length  of  160  mm  and  a  cover  glass  thickness  of  0.18  mm.  Nos.  H  and  J  are  for  oil 
immersion  work. 

C 


No 

Equivalent  focus,   mm 

Equivalent  focus, 
about,    inches 

Numerical   aperture  .  . 

Working  distance* 
with  160  mm  tube 
and  lOx  eyepiece, 
mm  

Diameter  of  the  freal 
field,  mm 

Each    . 


A 
48 


0.1 


28 

6.5 
4.75 


B 

32 

1% 

0.1 


15 

4.7 
4.75 


1) 
16 


F 
4 


1 
0.25 


9.5 

3.3 
6.00 


0.5 


1.5 

1. 
9.75 


O.C 


9.75 


0 

4 


v, 
0.85 


0.4(i 

0.4 

9.75 


II 
1.8 


1.25 


0.13 

0.2 
32.50 


3 

1.5 


1.25 


0.10 

0.14 
50.00 


*  Working  distance  is  the  distance  between  the  front  lens  and  cover  glass. 

t  Real  field  is  the  diameter  of  the  circular  area  seen  through  the  microscope  and  measured  in 

the  plane  of  the  object. 

Magnification  Table. 
Tube  length,  160  mm.  •  Image  distance,  250  mm. 


Objec- 
tives 
mm. 

Initial 
Majrnifi 
cation 

OCULARS 

Objec- 
tives 

mm. 

4x                5x                6x                8x                lOx                12x               15x                20x 

48 

2.2 

8 

11 

13 

18 

22 

27 

33 

44 

48 

40 

2.8 

11 

14 

17 

22 

28 

33 

42 

56 

40 

32 

4 

16 

20 

24 

32 

40 

48 

60 

80 

32 

30-22 

2-4.5 

4-9 

5-12 

8-19 

10-24 

15-?>."i 

18-43 

20-48 

30-70 

30-22 

25.4 

6 

24 

30 

36 

48 

60 

72 

90 

120 

25.4 

16 

10 

40 

50 

60 

80 

100 

120 

150 

200 

16 

12 

15 

60 

75 

90 

120 

150 

180 

225 

300 

12 

8 

20 

80 

100 

120 

160 

200 

240 

300 

400 

8 

5 

36 

144 

180 

216 

288 

360 

432 

540 

720 

5 

4 

44 

176 

220 

264 

352 

440 

528 

660 

880    II            4 

3 

60 

240 

300 

360 

480 

GOO 

720 

900 

1200    1              3 

1.8 

95 

380 

475 

570 

760 

950 

1140 

1425 

1900 

1.8 

1.5 

109 

436 

545 

654 

872 

1090 

1308 

1635 

2180 

1.5 

8760.     SLIDES,  Microscope,  medium  thick,   75x25  mm    (3x1   inch),  made  of   the  best  American  half- 
white  glass,  with  ground  edges,  in  boxes  of  %   gross per  gross  1.50 

8762.     SLIDES,  Microscope,  same  as  No.  8760,  but  75x50  mm,   (3x2  inches) per  gross  2.00 

8764.     SLIDES,   Microscope,   extra  thin,   75x25  mm  (3x1  inch),  of  white  glass per  gross  1.90 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


349 


8768. 
8776. 

8780. 


8784. 
8788. 

8792. 

8794. 

8798. 

8799. 
8802. 

8804. 
8810. 


No.  8788. 


No.  8802. 


No.  8810. 


SLIDES,  Microscope,  concave  center,   75x25  mm  (3x1  inch) per  dozen    $0.90 

SLIDE,  Drop  Culture  or  Hanging  Drop  Slide,  75x25  mm  (3x1  inch),  with  spherical  cavity  22 
mm  in  diameter  by  3  mm  deep,  ground  in  polished  plate  glass 30 

SLIDE,  Current,  Holman's.  A  plate  glass  slip,  with  two  oval  cells  connected  by  a  very  shal- 
low channel.  In  use,  the  cells  are  partly  filled  with  blood  and  covered  by  a  thin  cover  glass. 
By  bringing  the  finger  near  one  of  the  cavities,,  the  air  is  caused  to  expand  and  drive  the 
blood  through  the  channel  where  it  may  be  observed  under  very  favorable  conditions.  Com- 
plete with  cover 2.00 

SLIDE,  Life  Box,  consisting  of  two  glass  plates,  one  on  a  metal  slip,  the  other  adjusted  to  it 
by  a  sliding  sleeve.  For  examining  organisms  in  fluid.  Diameter  of  cell,  25  mm;  maximum 
depth,  8  mm;  slip  32x80  mm 2.50 

SLIDE,  Siphon,  Holman's.  Consists  of  a  thick  plate  glass  slip  with  two  shallow  oval  cavities 
and  a  deep  groove  to  hold  a  small  fish  or  similar  object  and  retain  it  without  undue  pressure 
in  a  fixed  position.  Small  metallic  tubes  communicate  with  the  extremity  of  the  deep 
groove.  By  means  of  these  tubes  water  may  be  siphoned  through  the  slide  thus  keeping  the 
water  supply  continuously  renewed  and  enabling  the  object  to  be  kept  under  observation  for 
long  periods  of  time.  Complete  with  cover 6.00 

SLIDE  MOUNTING  CELLS,  Glass.  Kings  with  finely  ground  edges,  for  cementing  on  micro- 
scope slides  to  make  cells.  No A  B  C  D  E 

Diameter,    mm 15  18  18  22  24 

Height,    mm 3  5  10  9  10 

Each 15          .15          .15          .15          .15 

SLIDE  MOUNTING  CELLS,  Hard  Rubber,  similar  to  No.  8792,  furnished  in  depths  from  0.5  to 

3mm.    Diameter,    mm 13  16  19 

Each 06          .06          .07          .07 

In  ordering  kindly  specify  depth  as  well  as  diameter. 

SLIDE  BOXES,  of  white  wood,  with  covers  fitting  inside,  so  arranged  that  when  removed  the 
ends  of  the  slides  are  exposed  so  that  they  can  be  easily  removed.  Grooved  to  hold  25  objects, 
numbered  and  indexed per  dozen  .90 

SLIDE  BOXES,  same  as  No.  8798,  but  grooved    to    hold    12    slides    numbered    and    indexed, 
per    dozen 95 

SLIDE  BOXES,  of  white  wood  with  covers  closely  fitting  outside,  grooved  to  hold  25  objects, 
numbered  and  indexed per  dozen  1.10 

SLIDE  BOXES,  grooved  to  hold  100  slides,  cloth  covered,  with  hinged  cover  and  catch,  each     .50 

SLIDE  CABINET,  Minot's  Metal,  very  compact,  occupying  much  less  space  than  a  wooden 
cabinet  and  affording  much  better  protection  against  fire.  It  is  strongly  made  of  metal 
throughout,  neatly  finished  on  the  outside  in  maroon-colored  japan  with  bronze  stripes.  The 
inside  finish  is  in  black  japan.  It  contains  30  japanned  metal  trays,  each  holding  24  glass 
slides,  75x25  mm.  The  trays  are  provided  with  convenient  knobs  and  with  card-holders. 
The  cabinet  is  furnished  with  a  good  brass  lock  and  measures  36.3  cm  in  height,  32.5  cm 
in  depth  and  17.5  cm  in  width,  outside.  Complete  with  30  trays 25.00 


350 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8858. 


No.  8818. 


No.  8820. 


8816. 


SLIDE  COVER  GLASSES,  made  of  the  best  white  glass,  uniform  in  thickness,  put  up  in  boxes 
of  %  ounce  each. 


Shape. 

•Thickness 

Dimensions. 

Price 

No. 

mm 

inches 

Per  oz. 

Squares 

1 

0.13-0. 

17 

1/^oo'1/lso 

In  ordering 

1.20 

Squares 

2 

0.17-0.25 

Mso'Woo 

specify  size  desired, 

1.05 

Squares 

3 

0.25-0. 

50 

VLOO-%O 

whether 

15  mm. 

1.00 

Circles 

1 

0.13-0.17 

(%"),  18  mm   (%"), 

1.50 

Circles 

2 

0.17-0.25 

Wso'^ioo 

22  mm  ( 

7/s"),  or 

1.35 

Circles 

3 

0.25-0.50 

1Aoo4oo 

25  mm 

(1"). 

1.30 

Eectangular 

2 

0.17-0 

25 

22x40  mm 

(65=1  oz) 

1.50 

Rectangular 

2 

0.17-0 

25 

I'iso-Moo 

22x50  mm  (60=1 

oz.) 

1.50 

Approximate  Number  of  Covers  Per  ounce. 

34" 

T4" 

1"               Circles   

&4  " 

%  " 

No    1                           296 

206 

150 

116               No     1  

362 

280 

182      142 

No    2                           234 

162 

120 

92               No.    2  

286 

195 

157      112 

No.   3  196 

136 

100 

76     ||         No.    3  

240 

166 

122  |     93 

8818. 
8820. 


8176. 
8178. 
8832. 


8836. 
8838. 
8852. 


8858. 
8862. 


SLIDE  HOLDERS,  soe  Staining  Dishes. 
SLIDE  HOLDER,  Basket  Form,   of  nickeled  brass,  for  use  in  staining  a  number  of  slides  simul- 
taneously.    Capacity,  12  slides,  placed  back  to  back 1.00 

SLIDE  HOLDER,  Multiplex,  designed  by  E.  P.  Miller  of  the  University  of  California.  Con- 
sists of  a  series  of  hard  rubber  plates  sliding  on  rods,  which  can  be  clamped  together  by 
means  of  a  knurled  thumb  screw.  Will  take  any  number  of  slides  up  to  26,  and  can  be  used 

in  any  kind  of  jar  or  receptacle 2.00 

SLIDE  LABELS  for  glass  slides,  22  mm  square,  in  boxes  of  100 per  box        .10 

SLIDE  LABELS,  for  glass  slides,  22x15  mm,  in  boxes  of  100 per  box        .10 

SLIDE  MAILING  CASES,  of  wood,  consisting  of  top,  middle  and  bottom  sections,  for  stacking. 

No A  B  C 

Section    top       middle  bottom 

Per  dozen 10          .10          .10 

SLIDE  TRAYS,  map  form,  to  hold  14  slides each        .30 

SLIDE  TRAYS,  map  form,  to  hold  20  slides each        .35 

STAGE,  Warm,  Electrically  Heated,  for  use  with  any  microscope  to  keep  the  stage  constantly 
at  blo.od  heat  or  other  temperature.  With  this  Warm  Stage,  micro-organisms  may  be  ob- 
served under  the  microscope  in  the  temperature  of  their  natural  habitat.  Consists  of  a  cir- 
cular disk  3%  inches  in  diameter  by  %  inch  thick;  with  heating  element,  thermometer,  and 
electro-thermostat,  which  can  be  adjusted  to  maintain  any  desired  temperature  on  the  top  of 
the  disk.  The  disk  has  a  %-inch  hole  in  the  center,  over  which  the  regular  microscope  slide 
may  be  placed.  Complete  with  cord  and  special  plug  for  attachment  to  any  110-volt  lamp 

socket   12.00 

TURN  TABLE  for  ringing  mounts.     The  slide  is  held  on  a  revolving  disk;   the  application  of 
cement  or  varnish  is  accurately  made  by  a  brush  held  above;  with  self-centering  device,  de- 
tachable hand-rest  and  clips  for  holding  down  slides.     Diameter  of  turn  table,  88  mm.  .      5.00 
WARMING  TABLE,  of  copper  plate,  for  drying  and  mounting.      Length,  350  mm;   width,   100 
mm ;  height,  213  mm 1-75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


351 


—  •4. 


5880. 


8886. 
BM& 

SSM. 


8894. 

8896. 
8897. 
8898. 


No.  8884. 


No.  8966. 


WAEMING  TABLE,  Electrically  Heated  and  Regulated,  for  warming  slides  in  mounting  paraf- 
fine  sections.  Can  also  be  used  in  fixing  and  hot  staining.  Constructed  of  a  block  of  transite 
24  inches  long  and  6  inches  wide,  mounted  on  a  metal  frame  3  inches  high.  A  series  of 
resistance  coils  embedded  in  the  transite  furnishes  the  heat,  the  degree  of  which  is  controlled 
by  a  thermo-regulator  adjusted  by  a  small  knurled  head  at  the  side.  A  pilot  lamp  indicates 
when  the  current  is  on  and  off.  Any  temperature  can  be  obtained  from  30°  to  70°C.  Ship- 
ping weight,  33  pounds.  Complete  with  metal  hood  to  protect  slides  from  dust,  thermometer, 
connecting  cord  and  plug  for  attachment  to  any  110-volt  lamp  socket $35.00 

MICROTOMES  AND  ACCESSORIES 

MICROTOME,  Hand,  intended  for  rapid  class  work  or  where  expense  is  the  chief  considera- 
tion. The  object  is  placed  in  a  clamp  in  the  upper  end  of  the  tube,  and  is  raised  through  the 
hole  in  the  glass  plate  by  an  accurately  cut  screw,  which  is  entirely  enclosed  and  protected 
from  dust  and  injury.  The  feed  ia  accurate  and  finely  graduated.  Each  division  represents 
10  microns.  The  plate  at  the  top  over  which  the  knife  is  drawn  is  3  inches  in  diameter,  mak- 
ing a  firm  support  for  the  knife without  knife  7.50 

MICROTOME,  Table,  for  all  kinds  of  sectioning,  including  the  freezing  method.  The  object 
clamp  is  placed  in  a  vertically  movable  socket,  held  by  hardened  steel  pivot  screws  in  two 
vertically  swinging  arms  which  are  similarly  attached  to  the  main  frame.  The  movement 
thus  provided  for  is  regulated  by  a  micrometer  screw,  with  graduated  disk  and  index  plate. 
The  finest  feed  is  2^  microns.  The  knife  travels  on  glass  plates  set  in  grooves  in  the  metal. 
These  plates  are  extra  long,  so  that  the  microtome  knife  will  not  be  drawn  off  from  the  ends, 
thereby  endangering  its  edge.  When  equipped  with  a  freezing  attachment,  it  makes  a  very 
satisfactory  microtome  for  frozen  section  work.  (See  Nos.  8885  and  8886.)  Without  knife  15.00 

MICROTOME,  Table,  same  as  No.  8884,  but  with  No.  8940  Freezing  Attachment  for  Carbon 
Dioxide  25.00 

MICROTOME,  Table,  same  as  No.  8884,  but  with  No.  8942  Freezing  Attachment  for  Ether  22.50 

MICROTOME  KNITE,  chisel  blade  form,  with  88  mm  cutting  edge,  for  use  especially  on  Nos. 
>**4  to  8S86 4.00 

MICROTOME,  Clinical  and  Diagnostic,  for  Hand  Teed,  provided  with  micrometer  screw  with 
graduated  or  toothed  head,  each  division  representing  5  microns  of  feed.  The  hinged  arm 
carrying  the  knife  is  held  rigidly  in  line  by  the  solid  metal  frame  preventing  an  uneven  or 
inaccurate  cut.  Complete  with  object  clamp  to  take  paraffine  blocks  up  to  30x22  mm,  but 
without  knife 19.50 

MICROTOME,  Clinical  and  Diagnostic,  for  Hand  Feed,  same  as  No.  8892,  but  with  freezing 
chamber  for  carbon  dioxide  with  needle  valve  to  control  the  flow  of  gas.  Will  take  objects 
up  to  30  mm  in  diameter without  knife  or  object  clamp  24.50 

MICROTOME,  Clinical  and  Diagnostic,  for  Hand  Feed,  same  as  No.  8894,  but  with  both  paraf- 
fine clamp  and  freezing  chamber  for  carbon  dioxide without  knife  26.50 

KNIFE  FOR  PARAFFINE  SECTIONS,  for  use  with  Nos.  8892  and  8896,  with  80  mm  cutting 
edge  5.00 

KNIFE  for  Frozen  Sections,  for  use  with  Nos.  8894  and  8896,  with  80  mm  cutting  edge. .      5.00 


352 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  8904. 


No.  8918. 


8902.  MICROTOME,  Clinical  and  Diagnostic,  with  Automatic  Peed,  similar  in  construction  to  No. 
8892,  but  with  automatic  device  for  moving  the  feed  screw  as  the  knife  is  returned  for  the 
next  stroke.  Complete  with  object  clamp  for  paraffme  blocks  up  to  30x22  mm,  but  without 
knife  $35.00 

8904.  MICROTOME,  Clinical  and  Diagnostic,  with  Automatic  Feed,  same  as  No.  8902,  but  with  freez- 
ing chamber  for  carbon  dioxide without  knife  or  object  clamp  40.00 

8906.     MICROTOME,  Clinical  and  Diagnostic,  with  Automatic  Feed,  same  as  No.  8902,  but  with  both 

paraffine  clamp  and  freezing  chamber  for  carbon  dioxide without  knife    42.00 

KNIVES  for  Nos.  8902,  8904  and  8906,  see  Nos.  8897  and  8898. 

8910.  MICROTOME,  Automatic  Laboratory,  designed  to  do  away  with  all  sliding  parts.  The  feed 
mechanism  is  automatic,  simple  in  construction,  covered  and  protected  from  dust  and  drip- 
pings. The  microtome  may  be  securely  clamped  to  any  laboratory  table.  It  may  be  set  to  cut 
sections  of  any  desired  thickness.  Each  division  of  the  graduated  scale  marks  5  microns. 
The  extreme  ends  of  the  knife  rest  in  carrier,  and,  as  the  lever  handle  moves  the  swing- 
ing arms,  the  knife  describes  a  flattened  curve,  corresponding  to  the  double  movement  in  free- 
hand sectioning.  By  this  manner  of  holding  the  knife  by  arms  which  are  not  parallel,  the 
entire  length  of  its  cutting  edge  is  utilized,  insuring  uniform  wear  and  permitting  the  cutting 
of  very  large  sections.  This  peculiar  motion  of  the  knife  makes  this  microtome  pre-emi- 
nently fitted  for  cutting  frozen  sections.  Complete  with  one  knife  and  usual  object  clamp 
for  paraffine  or  celloidin,  in  case 60.00 

8912.  MICROTOME,  Automatic  Laboratory,  same  as  No.  8910,  but  fitted  with  No.  8940  Freezing 
Attachment  for  Carbon  Dioxide 70.00 

8914.     MICROTOME,  Automatic  Laboratory,  same  as   No.   8910,   but   fitted   with   No.   8942   Freezing 

Attachment  for  Ether 67.50 

For  KNIVES  for  Nos.  8910  to  8914,  see  No.  8958B. 

8918.  MICROTOME,  Spencer  Simplified  Rotary,  designed  to  meet  the  demand  for  a  dependable  instru- 
ment of  precision  at  a  moderate  price.  A  high  degree  of  accuracy  is  attained  by  following 
the  same  principle  of  construction  which  is  used  in  the  Spencer  Eotary  Microtome  No.  8922. 
The  feed  mechanism  is  independent  of  the  up-and-down  movement  of  the  object.  It  is  oper- 
ated by  a  micrometer  screw,  cut  two  threads  to  the  millimeter,  to  which  is  fastened  a  wheel 
having  250  notches  cut  on  its  periphery.  Each  notch  represents  a  thickness  of  two  microns 
in  the  section.  The  instrument  will  cut  any  thickness  up  to  forty  microns  in  multiples  of  two. 
The  total  excursion  of  the  feed  is  30  mm.  A  crank  provides  a  means  for  adjusting  the  object 
to  the  knife  with  extreme  delicacy  and  also  for  returning  the  object  clamp  to  the  position 
necessary  for  starting  a  new  series  of  sections.  When  the  clamp  has  reached  the  extreme  for- 
ward position,  the  feed  mechanism  automatically  ceases  to  work. 

The  object  clamp  holder  is  moved  up  and  down  at  the  ends  of  two  parallel  hinged  arms  entirely 
independent  of  the  feed  mechanism.  The  clamp  may  be  rotated  on  its  axis  by  loosening  one 
of  the  screws.  It  regularly  takes  in  a  block  28  mm  wide  and  16  mm  thick.  There  is  a  provi- 
sion by  which  the  latter  dimension  may  be  increased  to  22  mm. 

The  whole  instrument  is  rigidly  made  and  runs  extremely  easily  and  quietly.  It  is  finished  in 
crystal  black  and  is  supplied  in  a  substantial  case.  Complete  with  one  No.  8958B  Knife  with 
handle  and  back  for  sharpening,  and  with  three  object  disks 75.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A,  353 


No.  8022.  No.  8925. 

S922.  MICROTOME,  Spencer  Rotary,  intended  for  the  most  accurate  and  careful  work.  An  inclined 
plane  feed,  which  is  independent  of  the  up-and-down  movement  on  the  perpendicular  support, 
overcomes  the  inaccuracies  inherent  in  other  rotary  microtomes.  The  provision  of  an  accurate 
and  reliable  feed  mechanism,  combined  with  the  utmost  rigidity  of  parts,  make  this  instru- 
ment the  most  precise  and  accurate  for  laboratory  or  research  work.  Sections  may  be  cut 
of  any  definite  thickness,  each  section  having  the  same  thickness. 

The  feed  mechanism  is  composed  of  a  rigid  bearing,  on  which  the  feed  block  is  moved  by  an 
accurate  screw,  cut  with  two  threads  to  the  millimeter;  it  is -revolved  by  a  ratchet  feed  wheel 
with  250  teeth;  each  tooth  represents  therefore  a  movement  forward  of  the  object  of  one 
micron.  The  feed  is  so  arranged  that  it  can  be  set  for  sections  of  any  thickness,  from  1 
micron  to  60  microns,  by  turning  the  knurled  button  at  the  back  of  the  case  until  the  number 
representing  the  desired  thickness  appears  opposite  the  indicator  at  the  small  opening  in  the 
side  of  the  case  near  the  balance  wheel.  The  total  excursion  of  the  feed  is  37  mm,  allowing 
a  sufficient  range  for  cutting  a  complete  series  of  a  very  large  object  without  the  necessity 
of  a  break  due  to  resetting  the  knife  and  feed  mechanism. 

The  up-and-down  stroke  of  the  object  clamp  is  50  mm  which  permits  the  cutting  of  very  large 
sections  and  gives  sufficient  stroke  for  celloidin  cutting.  The  clamp  may  be  held  at  its  upper 
limit  for  orienting  or  trimming  the  block  by  pushing  in  a  pin.  The  object  may  easily  be 
rotated. 

The  knife  is  fastened  by  two  clamps,  each  of  which  clamps  the  knife  at  the  back  and  along  IVt 
inches  of  the  edge  as  well.  It  may  be  turned  to  any  desired  angle,  and  the  clamps  may  also 
be  moved  toward  one  another  to  bring  them  as  near  to  the  ribbon  as  desired  to  gain  addi- 
tional rigidity.  When  the  clamps  are  thus  drawn  together,  the  knife  may  be  moved  so  that 
practically  all  of  the  cutting  edge  can  be  used  before  the  necessity  of  resharpening.  The 
adjustment  screws  provide  for  knives  of  different  widths.  The  whole  knife  support  is  adjust- 
able to  and  from  the  object,  and  is  very  easily  and  conveniently  clamped  in  any  location  by  a 
lever  connected  with  an  eccentric  cam. 

The  whole  of  the  feeding  mechanism  is  covered,  protecting  the  wearing  parts  from  dust  and 
presenting  a  very  neat  appearance.  The  top  of  the  case  is  hinged  to  the  lower  part,  permit- 
ting it  to  be  easily  opened.  The  balanct  wheel  is  grooved,  so  that  the  instrument  may  be 
run  by  a  motor.  The  whole  microtome  is  finished  in  crystal  black,  alcohol-proof  enamel.  The 
smaller  parts  are  heavily  nickel-plated. 

When  desired,  the  microtome  is  provided  with  an  adjustable  knife  support  which  is  especially 
adapted  to  celloidin  sections.  The  knife  holder  of  this  support  is  adjustable  from  a  horizontal 
position  through  55°  upward.  Complete  with  one  knife,  handle  and  back  for  sharpening,  and 
with  three  object  disks $130.00 

8923.  KJMJ_t'±;  HOLDER  for  Xo.  8922,  for  celloidin  sections  15.00 

8924.  KNTFE  HOLDER,  Adjustable,  for  No.  8922,  permitting  the  entire  block  carrying  the  knife  to 

be  shifted  1 !•>  inches  either  way  from  center    10.00 

8925.  RIBBON  CARRIER.  Spencer  Cylindrical,  for  use  with  No.  8922,  consisting  of  an  aluminum  cyl- 

inder mounted  in  an  aluminum  frame,  under  the  base  of  which  are  small  rollers,  rolling  in 
the  direction  of  the  long  dimension  of  the  frame.  The  end  of  the  ribbon  adheres  to  the  evl- 
inder,  which  is  slightly  turned  by  the  knurled  heads  shown  in  the  illustration  as  the  ribbon 
lengthens.  At  the  same  time,  the  cylinder  and  frame  are  gently  pushed  forward  on  the  rollers 
to  place  the  ribbon  on  the  cylinder  in  a  long  spiral.  The  cylinder  has  flanges  at  the  ends  so 
that  when  it  is  removed  from  its  bearings  and  placed  on  a  sheet  of  paper  on  the  table,  the 
sections  of  the  ribbon  are  not  injured.  When  in  this  position  each  turn  of  the  spiral  may  be 
cut  and  one  turn  after  another,  each  approximately  8  inches  long,  may  be  spread  out  in  order 
on  the  paper.  The  cylinder  is  4%  inches  long,  2%  inches  in  diameter,  and  mounted  so  as  to 

bring  it  as  close  as  possible  to  the  microtome  knife 8.00 

S926.  TABLE  fur  Xo.  S922,  complete  with  motor  and  speed  regulator,  all  enclosed.  Length,  38  inches; 
width,  26  inches;  oak  finish. 

Xo A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    80.00         98.75         75.00         93.75 


354 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  8934. 


No.  8936. 


No.  8940. 


No.  8942. 


MICROTOME  ACCESSORIES 

8932.     BLOCKS,  Red  Fiber,  for  holding  specimens  for  sectioning. 

.No A                 B  C  D 

Size,    inches %*%*%  %x%x%  %x%x%  lxlx% 

Per   100    $3.00            4.00  5.25  8.25 

8934.     EMBEDDING  BOX  for  Paraffine,  consisting  of  two  angle  pieces  of  metal  with  a  metal  plate. 

No ,. A               B  C 

Height,   mm 10              20  30 

Each   75            .75  .75 

8936.  EMBEDDING  TABLE  for  Paraffine,  of  cop'per,  400  mm  long  and  190  mm  wide  tapering  to  a 
point.  With  removable  legs,  213  mm  high 2.00 

8940.  FREEZING  ATTACHMENT  for  Carbon  Dioxide,  for  Nos.  8884  and  8910  Microtomes.  Sub- 
stantially made,  easy  to  operate,  and  exciedingly  efficient.  A  hard  rubber  non-conducting 
ring  between  the  corrugated  plate,  to  which  the  object  is  frozen,  and  the  rest  of  the  appara- 
tus, prevents  the  conduction  of  cold  away  from  the  specimen,  thus  saving  time  and  gas.  The 
chamber  is  provided  with  a  pin  like  that  on  the  object  clamp,  which  fits  into  the  same  socket 
on  the  microtome.  The  chamber  is  connected  with  the  CO2  cylinder  by  a  flexible  copper  tube. 
In  operating,  the  valve  at  the  chamber  should  first  be  closed  and  the  valve  at  the  cylinder 
slightly  opened,  to  admit  the  gas  into  the  tube.  Then,  by  opening  and  closing  the  small 
valve  at  the  chamber  three  or  four  times  in  quick  succession,  the  tissue  is  frozen  without  any 
waste  of  gas  and  without  any  inconvenience  caused  by  the  freezing  up  of  the  chamber  or  the 
connections.  By  this  method  a  section  may  be  cut,  stained  and  mounted  ready  for  examina- 
tion in  one  and  one-half  minutes  from  the  time  the  tissue  is  put  on  the  chamber.  Com- 
plete with  copper  tube  connections 10.00 

8942.  FREEZING  ATTACHMENT  for  Ether.  Consists  of  a  freezing  chamber  of  hard  rubber  which 
so  prevents  the  radiation  of  the  cold  that  the  tissue  is  quickly  frozen.  It  will  freeze  tissue 
15  mm  in  diameter  and  3  mm  thick  in  one  minute,  using  only  5  cc  of  ether.  The  ether  is 
held  in  the  metal  tank,  which  for  filling  may  be  unscrewed  from  the  support  from  which  it 
is  suspended.  Any  excess  of  ether  which  does  not  evaporate  is  drained  back  into  the  metal 
chamber  from  which  it  came.  There  are  no  bottles  or  entangling  tubes  and  no  waste  of 
ether.  It  is  simple,  compact  and  efficient.  It  can  be  used  on  any  sliding  microtome,  such  as 
Nos.  8884  and  8910 7.50 

8948.  HONE,  Ezy  Edge,  5%  inches  long  by  2  inches  wide,  a  fast,  smooth-cutting  hone,  combining  the 
sharpness  of  an  artificial  hone  with  the  softness  of  the  Belgian.  With  directions  for  use  .75 

8950.     HONE,  Blue-Green,  with  small  rubbing  block,  6  inches  long 20 

8952.     PALM  OIL  SOAP  for  use  with  Nos.  8948  and  8950 per  cake        .15 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


355 


Nos.  8958,  8961  and  8962. 


No.  8968. 


No.  8992. 


No.  8978. 


No.  8994. 

8958.  KNIVES,  Microtome,  of  selected  steel,  so  ground  and  tempered  as  to  produce  an  edge  which  is 
not  brittle  and  at  the  same  time  is  hard  enough  and  tough  enough  to  retain  its  keenness.  Com- 
paratively easy  to  sharpen;  evenly  tempered;  broad  and  heavy.  Without  handle  or  back,  in 

velvet  case.     Xo ." A  B  C  D 

Cutting  edge,  mm 50  110  185  250 

Each    $4.50  6.00         10.00         15.00 

8960.  KNIVES,  Microtome,  similar  to  Xo.  8958,  but  designed  specially  for  use  with  Microtome  Xo. 

8922.    Length  of  cutting  edge,  110  mm.    Without  handle  or  back;  in  velvet  lined  ease. 

Xo A  B 

For  sections celloidin     paraf fine 

Each    7.00  7.00 

8961.  HANDLE,  Ebonized,   for  use  in  sharpening  Xos.  8958  and  8960  Microtome  Knives.     The  han- 

dle is  provided  with  steady-pins  to  hold  it  in  proper  position,  while  the  handle-rod  is  threaded 
to  engage  directly  with  the  corresponding  thread  cut  in  the  knife,  and  is  tightened  by  means 
of  a  milled  head. "  The  metal  parts  are  finely  nickel-plated 1.00 

8962.  HONING  BACK  for  Xo.  8958B  Microtome  Knife,  to  be  used  in  order  that  the  knife  may  rest 

upon  the  honing  stone  at  the  proper  angle  when  being  sharpened.  Polished  and  nickel- 
plated  1.00 

8963.  HONING  BACK  for  Xo.  8960  Knives 1.00 

8966.     KNIFE,  Microtome,  Chisel  Blade,  for  use  on  the  table  microtome,  especially  where  a  freezing 

chamber  is  used.  Cutting  edge,  88  mm.  The  handle  is  of  such  size  and  shape  that  the  knife 
may  be  easily  held  in  the  desired  position 4.00 

8968.  KNIFE  HOLDEB  for  Safety  Razor  Blades,  of  brass,  nickel-plated,  for  use  on  any  microtome 
which  has  a  knife  clamp.  The  thin  edge  of  the  blade  projects  beyond  the  upper  edge  of  the 
holder  just  enough  to  keep  it  as  rigid  as  possible,  and  at  the  same  time  far  enough  to  allow 
the  specimen  to  pass  by  the  holder  after  cutting  the  section 4.00 

8972.  PITH,  for  use  in  cutting  sections;  in  sticks  about  100  mm  in  length  and  6  to  12  mm  in  dia- 
meter; in  packages  of  about  50  grams per  package  .10 

8978.  RAZOR,  Section,  folding  handle,  best  quality:  one  side  of  blade  flat,  the  other  side  concave: 
straight  edge,  hard  rubber  handle;  length  of  blade,  80  mm.  In  case 2.30 

8986.  STROP,  Microtome  Knife,  consisting  of  a  flat  strip  of  wood  with  handle,  on  the  sides  of  which 

are  cemented  pieces  of  leather  l*i  by  11  inches  long.  One  side  has  been  treated  with  car- 
borundum powder,  the  other  is  left  smooth  for  finishing 1.25 

8987.  STROP,  Microtome  Knife,  similar  to  Xo.  8986,  but  with  leather  on  one  side  only  which  has 

been  treated  with  carborundum.     Dimensions.  2*4x15  inches 1.50 

STROP.  Microtome  Knife,  same  as  Xo.  8987,  but  covered  with  best  shell  butt  horsehidel      2.25 
STROP,  Razor,  21x2  inches,  of  double  Russian  red  leather,  with  India  filled  back,  corrugated 

with  nickel-plated  swivel  and  handle 1.00 

8994.    STROPS,  Razor,  Emerson's,  of  calf -skin,  specially  selected  for  use  with*  microtome  knives  and 

section  razors.      No A  B 

Length,  inches 13%          17V, 

Each    i.oO  2.00 

S996.     DRESSING  for  strops per  box        .20 


356 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  9050  and  9052.    No.  No. 
9056.  9058. 


No.  9066. 


No.  9068. 


No.  9072. 


No.  9076. 


No.  9078. 


MILK  AND  BUTTER  TESTING  APPARATUS 

(Arranged  Alphabetically.) 

9050.    ACID  BOTTLE,  Combined.     By  tipping  the  bottle  forward  and  then  letting  it  come  back  to 

upright  position,   the  pipette  will   fill   with  17.5  cc  of  acid $5.00 

9052.  ACID  BOTTLE  TRUNNION,  convenient  for  handling  No.  9050  Acid  Bottle.  Base  is  of  wood 
covered  with  lead,  which  is  not  acted  on  by  sulphuric  acid.  Bottle  automatically  returns  to 

position   after   tipping 2.00 

0056.     ACID  BURETTES.     No A  B  C  D 

Number  of  charges  of  17.5  ce 3  6  12  25 

Each    2.25         2.50         2.70         3.35 

9058.    ACID  BURETTES.     No A  B  C 

Number  of  charges  of  8.8  cc 6  32  25 

Each   .-    2.50        2.70        3.35 

9062.   ACID  DIPPER,  Nans'  Style,  17.5  ec 40 

9064.    ACID  DIPPER,  Nans'  Style,  8.8  cc 40 

9066.    ACID  MEASURE,  cylindrical  jar  with  lip,  17.5  ce 15 

9068.    ACID  MEASURE,  cylindrical  jar  with  lip,  8.8  ce 15 

9072.  ACID  PIPETTE,  Automatic,  Farrington's,  consisting  of  a  two-neck  Woulff  bottle,  one  neck 
being  fitted  with  a  No.  10461  Automatic  Pipette,  delivering  17.6  cc;  the  other  neck  a  No.  1382 

Double  Rubber  Bulb complete     5.50 

ACID,  Sulphuric  for  Milk  Testing.    Prices  quoted  upon  application. 

9076.  ACID  TESTER,  Marschall,  for  the  accurate  determination  of  the  acidity  of  milk,  cream  and 
whey.  Exceedingly  simple,  and  equally  valuable  for  the  beginner  and  the  expert.  Consid- 
ered a  necessity  by  all  first-class  butter  and  cheese  makers.  Complete  with  combined  bu- 
rette and  bottle  for  neutralizer,  9  cc  pipette,  bottle  of  indicator,  and  half  gallon  bottle  of  neu- 

tralizer     8.50 

9078.  ACID  TESTER,  Nafis',  automatic,  easy  to  manipulate,  and  self-adjusting.  The  liquid  instantly 
readjusts  itself  to  zero,  so  that  the  only  reading  to  be  taken  in  using  the  apparatus  is  at  the 
point  on  the  graduated  scale  where  the  liquid  surface  is  located  after  the  sample  is  neutral- 
ized. Complete  as  illustrated,  with  neutralizer,  9  cc  pipette,  stirring  rod,  beaker,  2  ounce 
bottle  of  indicator  and  full  directions 5.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


357 


THE    NAFIS          I 
FAULTLESS  STIRRING  ROD 

~  SALT  TEST  _ 


No.  9095. 


No.  9092.   No.  9101.    No.  9108. 


No.  9130 


No.  560. 


9080.  STIKRING  ROD,  Nafis'  Faultless,  for  use  in  acidity  tests.  This  rod  is  hollow  and  contains  a 
piece  of  wool  of  the  exact  color  which  the  sample  of  milk  should  have  when  the  acidity  test 

is  complete    $0.18 

ACIDOMETEE,  see  general  heading  Hydrometers. 
APRONS,  see  general  heading  Aprons. 

9084.    ALKALINE  TABLETS,  Farrington's,  for  use  in  determining  the  degree  of  acidity  of  milk,  cream, 

or  whey Per  box  of  50  tablets        .25 

560.  BALANCE,  Cream,  Wisconsin  Hydrostatic,  devised  to  meet  the  demand  for  a  simple  and  cor- 
rect method  of  weighing  cream  into  test  bottles.  It  consists  of  a  specially  devised  brass  float, 
which  is  placed  in  a  cylinder  of  water.  The  instrument  is  weighted  so  as  to  float  in  a  verti- 
cal position,  and  has  at  the  top  a  small  pan  on  which  a  cream  bottle  and  a  9-gram  weight 
are  placed.  By  means  of  an  adjustable  pin  point,  the  point  to  which  the  float  sinks  in  water 
is  readily  marked.  The  9-gram  weight  is  then  taken  from  the  pan  and  the  cream  to  be 
tested  is  weighed  by  dropping  it  slowly  into  the  bottle  with  a  pipette  until  the  float  sinks  to 
the  same  point  it  reached  with  the  weight  on  the  pan,  when  the  test  bottle  will  contain 
exactly  9  grams  of  cream.  Very  accurate  weighings  can  be  made  with  this  instrument  and 
as  there  are  no  bearings  to  rust  it  will  retain  its  sensitiveness  indefinitely.  Complete  with 

metal  cylinder,  float,  and  9-gram  weight,  but    without    bottle 5.50 

For  other  BALANCES  for  Milk  and  Cream  Testing,  see  general  heading  Balances. 

9088.  BOTTLES,  Aluminum  Screw  Cap,  for  holding  samples  of  cream.  With  cork  washer.  One  ounce 
capacity Per  dozen  .90 

9092.  BOTTLE,  Butter  Test,  Illinois  pattern,  a  9  inch  bottle  for  testing  9  gram  samples  of  butter.  The 
neck  is  graduated  for  reading  up  to  90  per  cent.,  and  the  results  obtained  compare  very  favorably 
with  those  obtained  by  chemical  analysis .50 

9094.  BOTTLES,  Milk  Jars,  for  composite  tests,  made  of  flint  glass;  will  stand  much  hard  usage. 

Capacity,  pints %  1  2 

Per  dozen 1.00  1.30  1.60 

9095.  CAPS,  Tin,  for  No.  9004  Milk  Jars.     Will  fit  either  size,  and  keep  out  dirt  and  impurities. 

Per  dozen        .30 

BOTTLES,  MILK  AND  CREAM  TEST,  ORDINARY  GRADE 

9102.    BOTTLE,  Milk  Test,  6  inch,  18  gram,  8  per  cent.     Graduated  to  ^Q  P^  ce.  t .20 

9104.    BOTTLE,  Milk  Test,  6  inch,  18  gram,  10  per  cent.     Graduated  to  aj0  per  cent 20 

9108.    BOTTLE,  Cream  Test,  6  inch,  18  gram,  30  per  cent.     Graduated  to  Ms  per  cent 

9110.    BOTTLE,  Cream  Test,  6  iiich,  18  gram,  40  per  cent.     Graduated  to  1  per  cent 25 

9112.    BOTTLE,  Cream  Test,  6  inch,  18  gram,  50  per  cent.     Graduated  to  1  per  cent 25 

0114.    BOTTLE,  Cream  Test,  6  inch,  9  gram,  50  per  cent.  Graduated  to  %  per  cent.  Direct  reading.         .30 

9120.    BOTTLE,  Cream  Test,  9  inch,  18  gram,  30  per  cent.     Graduated  to  %0  per  cent 40 

9122.    BOTTLE,  Cream  Test,  9  inch,  18  gram,  50  per  cent.     Graduated  to  %  per  cent 40 

9124.    BOTTLE,  Cream  Test,  9  inch,  18  gram,  55  per  cent.     Graduated  to  %  per  cent 40 

9126.    BOTTLE,  Cream  Test,  9  inch,  18  gram,  100  per  cent.     Graduated  to  1  per  cent 60 

NOTE:     Nine  inch  Cream  Test  Bottles  are  too  long  for  regular  Babcock  Testers.     See  No.  9206 

Cream  Tester. 
9130.    BOTTLE,  Skim  Milk,  Perfect,  6  inch.     Graduated  to  yloo  per  cent 70 


358 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


33- 


No.  9170. 


No.  3850. 


No.  9174. 


No.  5254. 


No.  9172. 


No.  4192. 


BOTTLES,  MILK  AND  CREAM  TEST,  STANDARD 


The  following  bottles  (Nos.  9136  to  9142)  are  made  in  accordance  with  the  specifications  formu- 
lated by  the  Bureau  of  Standards,  Washington,  D.  C.,  and  adopted  by  the  Official  Dairy  In- 
structors' Association,  and  by  the  State  of  Indiana. 

9136.    BOTTLE,  Milk  Test,  Standard,  6-inch,  18-gram,  8  per  cent.     Graduated  to  i/i0  per  cent..    $0.30 
9140.    BOTTLE,  Cream  Test,  Standard,  6-inch,  9-gram,  50  per  cent.    Graduated  to  y2  per  cent..        .33 
9142.    BOTTLE,  Cream  Test,  Standard,  9-inch,  9-gram,  50  per  cent.    Graduated  to  %  per  cent . .        .40 
The  following  bottles  (Nos.  9146  to  9160)  are  made  in  accordance  with  the  specifications  formu- 
lated by  the  Dairy  and  Food  Commission,  Madison,  Wis. 

9146.    BOTTLE,  Milk  Test,  Standard,  6-inch,  18-gram,  10  per  cent.    Graduated  to  %0  per  cent..        .22 
9150.    BOTTLE,  Cream  Test,  Standard,  6-inch,  18-gram,  30  per  cent.    Graduated  to  V2  per  cent..        .33 
9152.     BOTTLE,  Cream  Test,  Standard,  6-inch,  18-gram,  40  per  cent.    Graduated  to  */2  per  cent. .        .33 
9154.    BOTTLE,  Cream  Test,  Standard,  7V2-inch,  18-gram,  50  per  cent.  Graduated  to  %  per  cent       .40 
9156.    BOTTLE,  Cream  Test,  Standard,  9-inch,  18-gram,  30  per  cent.    Graduated  to  7710  per  cent.        .40 
9160.     BOTTLE,  Cream  Test,  Standard.  9-inch,  18-gram,  50  per  cent.    Graduated  to  %  per  cent..        .40 
BRUSHES  for  cleaning  Milk  and  Cream  Test  Bottles,  see  general  heading  Brushes. 
BRUSH  for  cleaning  Milk  Jars,  see  Brushes. 

3848.     CAPSULES,  of  lead  (tin)  foil  for  milk  analysis.     No A  B  C 

Size,  inches 2%x%      2%xiy16      3^x^ 

Per  100 2.50  2.50  2.50 

For  other  CAPSULES,  see  general  heading  Capsules. 

9170.  CASEIN  TUBE,  Hart's,  for  estimating  amount  of  casein  in  milk.  To  be  used  in  any  Babcock 
Milk  Tester 40 

9172.  CATALASE  APPARATUS,  for  determining  the   presence   and   relative   amount   of    catalase    in 

milk,  with  measuring   arm   graduated   from  0  to   13   cc  in  i^0  ce   divisions.     Complete  with 
tube  for  holding  sample,  one-hole  rubber  stopper  and  glass  rod  to  close  hole  in  stopper. .     3.00 

9173.  CHARTS,  Milk  Record,  for  one  week's  record  of  15  cows,  with  spaces  for  both  morning  and 

afternoon  production,  in  pounds  and  tenths per    hundred     1.00 

0174.  CHURNS,  Dazey,  for  family  and  experimental  use.  Jars  are  of  glass,  so  that  process  can  be 
watched,  and  are  made  square  to  prevent  racing  of  cream  and  to  give  double  agitation.  With 
aluminum-coated  castings,  heavily  nickeled  cap,  hardwood  turbine  dasher,  heavily  tin-plated 

dash  rod,  smooth-running  gears,  with  directions  for  use.    No A  B  C 

Total  capacity,  pints 5  7%  9 

Churning  capacity,  pints 2%  3  %  4  Va 

Each    1.75  2.25  2.75 

.  3850.     DISHES,  Milk,  of  aluminum,  flat  bottom,  straight  sides. 

No A  B  C  D 

Diameter,   inches '2          2%  3  4 

Height,   inches V2  %  %  1 

Each    20          .30          .36          .40 

For  other  DISHES,  see  general  headings  Capsules;  Dishes,  Evaporating;  etc. 

4192.     DIVIDERS,  Plain  Brass,  for  reading  graduations  on  test  bottles.     Length  4%  inches 60 

5254.  FAT  EXTRACTION  TUBE,  Roehrig,  for  the  determination  of  fat  in  milk  and  milk  products, 
by  the  Roese-Gottlieb  method,  adopted  as  standard  by  the  Association  of  Official  Agricul- 
tural Chemists  4.50 

HYDROMETERS,  see  general  heading  Hydrometers. 
HYDROMETER  JARS,  see  general  heading  Cylinders. 
JARS,  Sample,  see  general  heading  Jars. 
LACTOMETERS,  see  general  heading  Hydrometers. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


359 


No.  9194. 


No.  9200. 


No.  9204D. 


Nos.  9210-11. 


Nos.  8214-15. 


9194.  MILK  TESTER,  Babcock,  for  hand  power,  with  enclosed  cut  steel  spiral  gears  which  run  in  grease 
without  noise.  A  clamp  is  provided  for  attaching  to  any  table.  With  seamless  brass  pockets 
firmly  secured,  of  the  proper  depth  to  contain  hot  water  to  submerge  the  bottles.  Complete  with 
two  6  inch,  18  gram,  10  per  cent,  milk  test  bottles;  one  17.6  ce  pipette;  one  17.5  cc  acid  measure; 

one  test  bottle  brush,  and  full  directions  for  use 56.50 

9196.  MILK  AND  CREAM  TESTER,  Babcock,  for  hand  power,  same  as  No.  9194,  but  with  two  6  inch, 
18  gram,  10  per  cent,  milk  test  bottles;  two  6  inch,  18  gram,  30  per  cent,  cream  test  bottles; 
one  combined  17.6-18  cc  pipette;  one  17.5  ce  acid  measure;  one  test  bottle  brush,  and  full  direc- 
tions for  use 7>15 

9200.  MILK  AND  CREAM  TESTER,  Babcock,  for  hand  power,  same  as  No.  9194,  but  four  bottle  size. 
Complete  with  four  6  inch,  18  gram,  10  per  cent,  milk  test  bottles;  two  6  inch,  18  gram,  30  per 
cent,  cream  test  bottles;  one  combined  17.6-18  ce  pipette;  one  17.5  ec  acid  measure;  one  test 

bottle  brush,  and  full  directions  for  use 8-50 

9204.  MILK  TESTERS,  Babcock,  for  hand  power,  with  solid  iron  case  and  hinged  cover,  cut  steel  spiral 
and  spur  gears  and  seamless  brass  pockets,  with  tinned  malleable  hangers.  _  Gearing  and  shafts 
are  mounted  on  a  separate  frame  easily  removed  for  repairs  or  repacking  with  grease.  Complete 
with  one  set  of  6  inch,  18  gram,  10  per  cent,  milk  test  bottles,  one  17.6  ce  pipette,  one  17.5  ce 
acid  measure,  one  test  bottle  brush  and  full  directions. 

No A  B  C  D 

Capacity,  bottles 6  8  10 

Each  . .' 16.65  18.50  19.35  20.10 

9206.  CREAM  TESTER,  Babcock,  for  hand  power,  twelve  bottle  size,  same  as  No.  9204  Milk  Tester,  but 
for  9  inch  cream  bottles.  Complete  with  twelve  9  inch,  18  gram,  30  per  cent,  cream  test  bottles, 

one  18  ce  pipette,  one  17.5  cc  acid  measure,  one  test  bottle  brush,  and  full  directions 35.00 

MILK  TESTERS,  Babcock,  Electric,  same  style  as  Nos.  9194,  but  mounted  directly  on  a  vertical 
spindle  electric  motor.  Prices  include  glassware  and  accessories  listed  under  Nos.  9194  and 
9196. 

No 

Capacity,  bottles 

For  110  volts,  A.C 

For  110  volts,  D.C 


9210. 
9211. 


A 

2 

50.40 
50.40 


9214. 
9215. 


B 
4 

51.60 
51.60 

MILK  TESTERS,  Babcock,  Electric,  with  same  frame  and  bottle  carrier  as  No.  9204.  The 
motor  which  is  a  standard  i/i2  h.  p.  G.  E.  motor  with  a  speed  of  1800  r.  p.  m.,  is  carried  on  a 
separate  frame  or  sub-base  and  is  belt  driven  requiring  no  starting  device.  Prices  include 
glassware  and  accessories  listed  under  No.  9204. 

No A  B  C 

Capacity,    bottles 6  8  10 

For  110  volts,  A.C 74.80        75.90        78.10 

For  110  volts,  D.C 74.80        75.90        78.10 


360 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


9218.  MILK  TESTERS,  Babcock,  International  Electric  No.  1,  for  8  'bottles.  This  is  the  regular  No. 
2670  International  Centrifuge,  equipped  with  No.  2685  Head  with  trunnion  rings  and  cups  for 
8  six-inch  milk  bottles.  This  head  is  interchangeable  with  any  of  those  listed  in  Accessories 
for  International  Centrifuge  No.  1.  (See  general  heading  Centrifuges.)  Height  closed,  18 
inches;  open,  28  inches;  diameter,  17  inches;  shipping  weight,  about  160  pounds.  Complete 
with  8  trunnion  buckets  and  speed  control  rheostat  but  without  glassware. 

No A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    $101.40       105.00         97.80       101.40 

9220.  MHiK  TESTERS,  Babcock,  International  Electric  No.  2,  for  16  bottles,  for  use  with  either 
6-inch  milk  bottles  or  9-inch  cream  bottles.  This  is  the  regular  International  Centrifuge  No. 
2696  equipped  with  No.  2708  Head  with  trunnion  rings  and  cups  for  16  bottles.  This  head  is 
interchangeable  with  any  of  those  listed  in  Accessories  for  International  Centrifuge  No.  2. 
(See  general  heading  Centrifuges.)  Height  closed,  28  inches;  open,  4'J  inches;  diameter,  24 
inches;  shipping  weight,  about  450  pounds.  Complete  with  16  trunnion  buckets  for  6-inch 
milk  bottles,  speed  control  rheostat,  and  mechanical  brake  but  without  glassware. 

No A  B  C  D 

A.C.  D.C. 

For  volts   110  220  110  220 

Each 220.00       220.00       220.00       220.00 

9222.  MILE  TESTERS,  Babcock,  International  Electric  No.  2,  for  24  bottles.  This  is  a  modi- 
fied form  of  the  No.  2696  International  Centrifuge,  having  a  12-place  head  which  carries 
double  trunnion  rings  and  buckets  for  all  styles  of  Babcock  test  bottles.  Height  closed,  28 
inches;  open,  40  inches;  diameter,  24  inches;  shipping  weight,  about  450  pounds.  Complete 
with  trunnion  buckets,  speed  control  rheostat,  and  mechanical  brake,  but  without  glassware. 

No A  B  C  D 

A.C.  D.C 

For  volts 110  220  110  220 

Each   180.00      180.00      180.00       180.00 

HEATERS,  Electric,  for  use  with  International  Electric  Babcock  Testers,  for  heating  test  bot- 
tles while  in  the  centrifuge.    Operates  on  the  same  current  as  the  motor. 

No A  B 

For  Centrifuge  No 9218       9220-2 

9224.  For  110  volts 13.20         14.30 

9225.  For  220  volts 13.20        14.30 

9228.  METAL  CUP  for  use  with  Nos.  9218  and  9220,  for  9-inch  Babcock  bottles 83 

9229.  TRUNNION  RING  for  No.  9228 55 

9236.    MILE  TESTER,  Babcock,  Traveling  Outfit,  consisting  of  two-bottle  Babcock  Tester  No.  9194, 

and  the  following  accessories: 

2  6-ineh,  18-gram,  10%  milk  test  bottles.  1  floating  dairy  thermometer. 

2  6-inch,  18-gram,  30%  cream  test  bottles.  1  hydrometer  jar,  10x1%  inches. 

2  double  neck  skim  milk  bottles.  1  17.5  cc  acid  measure. 

1  cream  and  milk  pipette  (17.6-18  cc.)  1  small  Quevenne's  lactometer. 

1  test  bottle  brush.  1  set  directions. 

Complete  in  handsomely  finished  hardwood  case  with  separate  compartments  for  glassware  and 
acid  13.75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


361 


9238. 


9240. 


No.  9240. 


MILK  TESTER,  Babcock,  Traveling  Outfit,  same   as 
Tester  No.  9200,  and  two  extra  milk  test  bottles   . 


No.  9262. 


No.    9236,   but   with    four-bottle 


Babcock 
.  .  $15.00 


MILK  TESTER,  Babcock,  Traveling  Outfit,  consisting  of  No.  9200  Babcock  Tester  in  a  handsome 
leather  case  as  shown  in  the  illustration,  10%xlO%xl0^j  inches  outside.  Complete  with  the 
same  equipment  of  glassware  and  accessories  as  listed  under  No.  9238 31.25 


9241. 

9242. 
9243. 
9244. 
9245. 
9246. 
9247. 
9248. 
9249. 
9250. 
9251. 
9252. 
9253. 
9254. 
9255. 
9256. 
9257. 

9262. 


appears.  (451-1) . 


Repairs    for    Babcock    Milk   Testers 

Nos.  9194  to  9200  and  9236  to  9240. 

The  numbers  in  parenthesis  are  the  manufacturer's  numbers,  which  in  some  instances  appear  on 
the  parts. 

COVER,  with  thumb  screw  and  collar.    This  is  the  part  of  the  gear  case  which  attaches  to  the 
table.    (452-1)  

CASE.     This  is  the  front  of  the  gear  ease  on  which  the  name  "Facile" 

THUMB  SCREW.     (454H) 

SWIVEL  or  collar  for  thumb  screw.     (454G) 

SCREWS  for  cover.     (4541) 

CRANK  only,  without  handle.     (453) 

CRANK,  complete  with  handle.     (454E) 

WOOD  HANDLE  for  crank.     (454D) 

HANDLE  RIVET.     (454C) 

CRANK  SHAFT.     (454B) 

TAPER  PIN  for  attaching  crank  to  crank  shaft.    (454F) 

GEAR  for  inner  end  of  crank  shaft.     (454) 

WORM  SPINDLE,  with  slot  at  top  for  head.    (454A) 

BALL  for  bearing.     (454J) 

TWO-BOTTLE  HEAD,  with  rivets  and  pins,  but  without  cups  or  cup  holders.     (455) 

FOUR-BOTTLE  HEAD,  with  rivets  and  pins,  but  without  cups  or  cup  holders.     (456) . . . 
CUP  HOLDER  AND  BRASS  CUP.     (457-457A)    


.60 

.72 

.18 

.06 

.03 

.24 

.30 

.06 

.06 

.12 

.03 

.90 

.42 

.03 

.10 

.90 

.36 


9266. 


MOISTURE  TESTER,  Ames,  for  moisture  in  butter,  consisting  of  a  jacketed  paraffine  con- 
tainer made  of  copper.  The  outside  shell  has  a  rounded  bottom  to  expose  as  much  surface 
as  possible  to  the  heat  from  an  alcohol  lamp.  An  aluminum  sample  cup  fits  closely  within 
the  inside  shell,  having  contact  all  the  way  down  so  that  the  heat  from  the  paraffine  is  trans- 
mitted without  loss.  Complete  with  nickel-plated  support  stand,  special  thermometer  reading 
from  100  to  200"C.,  alcohol  lamp,  tongs  for  lifting  the  sample  out,  and  full  directions. .  6.00 

PAPER,  Fat  Free,  for  the  determination  of  fat  in  milk,  according  to  Adams'  method.  In 
boxes  of  50  strips,  560x65  mm per  box  2.80 


362 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  9288. 


No.  9282. 


9270.  PASTEURIZING  OUTFIT,  for  steam  or  hot  water,  consisting  of  a  neatly  finished  vessel  with 
convenient  handles  and  cover,  and  with  rack  for  holding  eight  sterilizing  bottles.  Beads 
around  the  sterilizing  chamber  mark  the  points  to  which  water  should  be  filled.  Complete 
with  bottles  and  brush  for  cleaning $4.50 

9272.  PIOSCOPE,  or  Milk  Tester,  Heeren's.  For  showing  the  richness  of  milk  by  color  comparison.  A 
set  of  appropriately  labeled  standard  colors  is  furnished,  together  with  a  convenient  means  of 
comparing  with  the  standards  the  color  assumed  by  the  sample  of  milk  during  the  test. . .  .75 

9276.   PIPETTES,  Cream. 

No A  B 

Capacity,  cc 9  18 

Each 15  .15 

Per  dozen  1.50  1.50 

9278.   PIPETTES,  Milk. 

No A  B 

Capacity,  cc 8.8  17.6 

Each 15  .15 

Per  dozen  1.50  1.50 

9280.  PIPETTES,  Milk,  17.6  cc,  in  accordance  with  the  specifications  formulated  by  the  Bureau  of 
Standards  and  adopted  by  the  .Official  Dairy  Instructors'  Association  and  bv  the  State  of 

Indiana    Each  .35 

Per  dozen      3.50 
9282.     PIPETTES,  Milk,  17.6  cc,  in  accordance  with   the   specifications   formulated  by   the  Dairy   and 

Food   Commission   of   Wisconsin Each  .35 

Per  dozen      3.50 

9284.   PIPETTES,  Milk  and  Cream,  17.6-18  cc  combined Each  .19 

PIPETTES,  Volumetric,  see  general  heading  Pipettes.  Per  dozen       1.90 

9288.    RACK,  for  Babcock  Test  Bottles,  of  tin.    Hangs  flat  against  the  wall;  the  bottles  stand  upright 

and  are  easily  filled.     Capacity,  24  bottles 1.80 

9292.  RENNET  TESTER,  Marschall,  a  simple,  reliable  and  indispensable  aid  to  every  cheese  maker. 
It  enables  the  maker  to  ascertain  the  condition  of  the  milk,  and  to  regulate  its  ripening  to  an 
exact  point,  alike  every  day,  which  is  very  essential  in  order  to  insure  uniform  work  and 
uniform  quality  of  the  cheese.  Includes  graduated  cup  (a),  a  1  cc  pipette  (b),  a  bottle  (c) 
in  which  to  dilute  the  rennet,  and  a  spatula  (d)  for  stirring  the  milk.  Complete  in  a  hand- 
some case  4.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


363 


No.  9298. 


No.  9308. 


o 

Nos.  9322-5. 


No.  9314. 


A 
9299. 

9302. 
9304. 
0308. 


9298.  SALT  TESTER  FOR  BUTTER,  Nafis.  This  apparatus  is  automatic,  easy  to  manipulate,  and 
self-adjusting,  and  is  especially  suited  for  rapid  determination  of  the  per  cent,  of  salts  in 
butter.  The  liquid  in  the  graduated  tube  instantly  readjusts  itself  to  zero  so  that  the  only 
reading  to  be  taken  in  using  the  apparatus  is  at  the  point  on  the  graduated  scale  where  the 
liquid  surface  is  located  after  the  test  is  completed.  With  a  10-gram  sample  of  butter  each  cc 
of  solution  drawn  from  the  burette  will  equal  %  per  cent,  salt  in  the  butter.  Complete  as 
illustrated  together  with  10-gram  weight,  250  cc  flask,  standard  solution  in  dry  form,  25  cc 
pipette,  porcelain  cup,  stirring  rod,  medicine  dropper,  beaker,  2-ounce  bottle  of  indicator,  and 

full    directions $6.50 

STIRRING  ROD,  Nans'  Faultless,  for  use  in  No.  9298  Salt  Tester.    This  rod  is  colored  to  show 

the  exact  tint  taken  by  the  sample  when  the  test  is  complete 15 

SCORE  CARDS,  Dairy  Cattle,  in  tablets  of  50  sheets Per  tablet         .20 

SCORE  CARDS,  Market  Cream,  in  tablets  of  50  sheets Per  tablet        .20 

SEDIMENT  TESTER  for  Milk,  as  described  by  Professors  Babcock  and  Farrington.  Consists 
of  a  cylinder  2%  inches  in  diameter  and  6  inches  long,  funnel  shaped  at  the  bottom  and  ter- 
minating in  an  opening  about  1  inch  in  diameter.  In  the  cap  at  the  bottom  is  a  wire  gauze 
strainer  on  which  a  thin  disk  of  absorbent  cotton  is  placed.  After  a  pint  sample  of  milk  has 
been  filtered  through  the  apparatus,  the  cotton  filter,  with  the  dirt  which  it  has  collected,  is 
detached  and  allowed  to  dry.  The  amount  of  dirt  obtained  will  differ  with  different  lots  of 
milk  and  disks  when  dry  may  be  returned  to  the  milk  producer  as  evidence  as  to  the  clean- 
liness of  the  milk.  The  central  cylinder  is  surrounded  by  a  steam  or  hot  water  jacket  with 
%  inch  intervening  space  so  that  the  milk  can  be  kept  hot  and  the  filtering  process  thereby 
hastened.  Complete  with  500  disks  and  with  bracket  for  mounting  against  the  wall.  12.00 
9309.  DISKS,  Absorbent  Cotton,  for  use  with  No.  9308  Sediment  Tester,  in  boxes  of  100,  per  box  .50 
9314.  SLIDE  SCALE,  Richmond's,  for  calculating  the  total  solids  in  milk,  with  scale  for  tempera- 
ture correction  of  specific  gravity.  This  slide  rule  will  be  found  of  great  advantage  and  serv- 
ice to  cheese  factory  men  and  milk  inspectors,  as  well  as  those  interested  in  the  preparation 
and  examination  of  milk  for  use  of  children  and  invalids 5.50 

9316.  TABLETS,  Corrosive  Sublimate,  for  keeping  milk  samples  sweet.     Used  in  making  composite  tests. 

Will  color  samples  so  that  danger  of  mistakes  is  avoided.  Small  size  will  keep  samples  sweet 
for  two  weeks.  In  boxes  of  50  tablets Per  box  .30 

9317.  TABLETS,  Corrosive  Sublimate,  same  as  No.  9316,  but  large  size,  will  keep  samples  sweet  for  four 

weeks.     In  boxes  of  50  tablets Per  box         .50 

9322.  TESTER,  Nafis,  for  Babcock  Test  Bottles,  made  of  brass.    To  make  a  test,  fill  the  bottle  with 

alcohol  deeply  colored  with  black  aniline  or  writing  ink  until  it  is  almost  opaque  (this  does 
away  with  the  meniscus)  so  that  the  highest  point  is  exactly  even  with  the  zero  mark.  Then 
slowly  lower  the  Tester  into  the  bottle  until  the  liquid  rises  half  way  between  the  two  sec- 
tions. At  that  point  should  be  the  middle  mark.  After  that  point  is  tested  for,  slowly  lower 
the  entire  tester  into  the  bottle  so  that  the  liquid  rises  over  the  top  of  the  upper  section 
about  an  eighth  of  an  inch.  If  the  liquid  is  even  with  the  top  mark  and  was  also  at  the 
middle  mark,  the  bottle  is  correct.  For  6  inch,  10%  milk  test  bottles 1.00 

9323.  TESTERS,  Nafis,  same  as  No.  9322,  but  for  6-inch  18-gram  cream  test  bottles. 

No A  B  C 

For  bottles,  per  cent 30  40  50 

Each    1.25  1.50  1.65 

9324.  TESTER,  Nafis,  same  as  No.  9322,  but  for  6-inch,  9-gram,  50%  cream  test  bottles 1.65 


304 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


1 


No.  9330.       No.  9332. 


9325. 


No.  9334. 


No.  9338. 


No.  9342. 


TESTERS,  Nafis,  same  as  No.  9322,  but  for  9-inch  cream  test  bottles. 

No A  B 

For  bottles,  per  cent 30  50 

Each    $1.65         1.65 

TEST  TUBES,  Butter  Fat  Oil,  plain,  9x%  inches ; Per  dozen 

TEST  TUBES,  Butter  Fat  Oil,  with  line  5  inches  from  bottom Per  dozen 

TEST  TUBES,  Cream,  heavy,  for  samples,  5x1*4  inches ...  .  .Fei  dozen 

THERMOMETER,  Dairy,  standard,  for  those  who  wish  a  more  accurate  thermometer  than  the 
ordinary.  Hand-written  paper  scale,  one  degree  graduation,  accurate  within  one  division  of  the 
scale,  weighted  with  shot  and  guaranteed  to  float  upright.  Ten  inches  long.  Approximate  scale 

range  10°  to  110°  Fahrenheit 2.40 

9340.    THERMOMETER,  Pasteurizing,  with  enclosed  hand-written  paper  scale;  approximate  scale  range 
30°  to  220°  Fahrenheit;  graduated  in  2°  divisions  and  accurate  within  one  division  of  the  scale. 

2.20 


9330. 
9332. 
9334. 
9338. 


C 
55 
1.65 
.90 
.90 
.90 


MILLS,  see  Crushing  and  Grinding  Apparatus. 

9342.  MINERAL  COLLECTION,  in  wooden  cases  with  covers,  each  specimen 
with  a  label  giving  the  name  and  locality.     100  specimens  5x6  cm.. 

LIST  OF  MINERALS  INCLUDED. 

26.  Quartz,   Chalcedony.  51.   Aragonite. 

27.  Quartz,  Agate.  52.  Witherite. 


being  in  a  pasteboard  tray 
35.00 


1.  Graphite. 

2.  Sulphur. 

3.  Copper. 

4.  Orpiment. 
a.   Stibnite. 

6.  Molybdenite. 

7.  Galena. 

8.  Chalcocite. 

9.  Sphalerite. 

10.  Cinnabar. 

11.  Millerite. 

12.  Niccolite. 

13.  Pyrrhotite. 

14.  Bornite. 

15.  Chalcopyrite. 

16.  Pyrite. 

17.  Cobaltite. 

18.  Arsenopyrite. 

19.  Halite. 

20.  Fluorite. 

21.  Cryolite. 

22.  Quartz,  Rock   Crystal. 

23.  Quartz,  Amethyst. 

24.  Quartz,  Rose. 

25.  Quartz,  Smoky. 


28.  Quartz,   Flint. 

29.  Quartz,  Jasper. 

30.  Opal,   Semi-opal. 

31.  Cuprite. 

32.  Corundum. 

33.  Corundum-Emery. 

34.  Hematite  crystal. 

35.  Hematite  compact. 

36.  llmenite. 

37.  Magnetite. 

38.  Chromite. 

39.  Braunite. 

40.  Cassiterite. 

41.  Rutile. 

42.  Pyrolusite. 

43.  Limonite. 

44.  Bauxite. 

45.  Calcite   crystal. 

46.  Calcite,  Cleavage. 

47.  Caleite-Marble. 

48.  Magnesite. 

49.  Siderite. 

50.  Siderite-Clay   Iron-Stone. 


53.  Strontianite. 

54.  Cerussite. 

55.  Malachite. 

56.  Orthoclase  xld. 

57.  Orthoclase-cleavage. 

58.  Orthoclase-Sanidine. 

59.  Oligoclase. 

60.  Labradorite. 

61.  Enstatite. 

62.  Pyroxene. 

63.  Wollastonite. 

64.  Amphibole,    Actinolite. 

65.  Amphibole,  Hornblende. 

66.  Garnet. 

67.  Crysolite.  Olivine. 

68.  Vesuvianite. 

69.  Zircon. 

70.  Andalusite. 

71.  Cyanite. 

72.  Epidote. 

73.  Calamine. 

74.  Tourmaline. 

75.  Chabazite. 


76.  Natrolite. 

77.  Muscovite. 
78i  Lepidolite. 

79.  Prochlorite. 

80.  Serpentine. 

81.  Talc,  foliated. 

82.  Talc  soapstone. 

83.  Sepiolite,   Meerschaum. 

84.  Kaolinite. 

85.  Titanite. 

86.  Apatite. 

87.  Apatite.  Phosphorite. 

88.  Lazulite. 

89.  Wavellite. 

90.  Barite. 

91.  Anglosite  on  Galena. 

92.  Gypsum. 

93.  Gypsum,  Alabaster. 

94.  Alunite. 

95.  Wolframite. 

96.  Ozocerite. 

97.  Amber. 

98.  Asphaltum. 

99.  Anthracite. 
100.  Cannel  Coal. 


9343.  MINERAL  COLLECTION,  same  as  No.  9342,  but  100  specimens  3x4  cm 23.00 

9344.  MINERAL   COLLECTION,  same  as  No.  9343,  but  in  pasteboard  box  instead  of  wooden  case     18.00 

MINERALS  FOR  WIRELESS  TELEGRAPHY. 


Per  ounce. 

Bornite,  pure 20 

Carborundum,  crystals .15 

Chalcopyrites,  with  Iron  Pyrites ...         .10 

Chalcopyrites,  pure .15 

Franklinite .10 

Galena,  cubical 10 

Iron  Pyrites,  crystallized,  radiated.         .10 
Iron  Pyrites,  crystallized,  cubical..         .15 


Molybdenite 

Silicon,  fused 

Stibnite,  crystallized 

Zincite,  70  per  cent 

Zincite,  100  per  cent 

Rose's  Metal,  M.  P.  203°  F.  . 
Wood's  Metal,  M.  P.  158°  F. 


Per  ounce. 

20 

20 

20 

40 

65 

30 

.30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


365 


No.  9346. 


No.  9347. 


9346.  MINERAL  COLLECTION.      An   exceedingly  fine  collection  of  110  specimens  in  a  substantial 

hardwood  box  23xl5i£x5  inches,  with  hinged  cover.  The  specimens  are  in  pasteboard  trays, 
fitting  in  two  wood  trays,  and  are  from  one  to  three  inches  in  linear  dimensions,  each  one  be- 
ing labeled.  Contains  every  important  mineral,  including  ores  of 

Aluminum,                         Gold,                                    Molybdenum,                    Tin, 
Antimony,                          Iron,                                     Nickel,                                Titanium, 
Arsenic,                              Lead,                                    Radium,                             Tungsten, 
Bismuth,                             Lithium,                              Silver,                                Uranium, 
Cobalt,                                Manganese,                         Strontium,                         Vanadium, 
Copper,                               Mercury,                              Tantalum,                          Zinc, 
and  a  large  number  of  miscellaneous  minerals    $40.00 

9347.  MINERAL  COLLECTION  (Washington  School  Collection).  Contains  the  following  minerals  and 

rocks,  good  size,  each  labeled  and  placed  in  a  separate  tray.  The  whole  in  a  neat  cloth  covered 
case  with  a  set  of  unlabeled  duplicates  (Set  No.  9348)  for  student 4-50 


1.  Graphite. 

2.  Galena. 

3.  Sphalerite. 

4.  Chalcopyrites. 

5.  Pyrites. 

6.  Fluorite. 

7.  Quartz  Crystal. 


1.  Conglomerate. 

2.  Friable  Sandstone. 

3.  Red  Sandstone. 

4.  Potter's  Clay. 

5.  Shale. 

6.  Calcareous  Tufa. 

7.  Oolitic  Limestone. 


MINERALS. 

8.  Quartz,  Milky. 

9.  Hematite. 

10.  Magnetite. 

11.  Limonite. 

12.  Calcite. 

13.  Siderite. 

14.  Orthoclase. 

ROCKS. 

8.  Fossiliferous  Limestone. 

9.  Compact  Limestone. 

10.  Peat. 

11.  Lignite. 

12.  Basalt. 

13.  Granite. 

14.  Diabase. 


15.  Amphibole  (Hornblende). 

16.  Amphibole  (Asbestos). 

17.  Garnet. 

18.  Muscovite. 

19.  Talc. 

20.  Gypsum. 


15.  Gneiss. 

16.  Mica  Schist. 

17.  Quartzite. 

18.  Clay  Slate. 

19.  Dolomite. 

20.  Residual  Sand. 


9348.  STUDENT'S  COLLECTION,  consisting  of  smaller  duplicate  nnlabeled  specimens  of  Set  No.  9347 

for  student  classification -45 

9349.  TRAYS,  Mineralogical  Specimen,  made  of  heavy  cardboard,  covered  on  outside  with  black  cloth. 

Inside  black.     Depth  of  each  tray,  %  inch. 

Xo A  B  C  D 

Size,  outside,  in  inches 2x3  3x4  4x6  6x8 

Each                       10  .10  .15  .20 

Per  100   .                                  6.00  7.00  10.00  15.00 


366 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  9350. 


No.  9370. 


No.  9372. 


No.  F7115. 


No.  9360. 


No.  9362. 


No.  9384.       No.  9386. 


9350.  MITRE  BOX,  Olmstead's.  Can  be  used  with  ordinary  hand  saw,  which  will  do  perfect  work  and 
not  cut  the  frame  away.  Provided  with  iron  guides  for  saw.  Small  size,  will  cut  1%-inch 

moulding,   etc $1.95 

MITTENS,  see  Gloves. 

0360.  MODELS,  Atomic,  Kekule  and  Von  Baeyer,  consisting  of  20  black  balls  with  four  connecting 
posts  each,  10  red  balls  with  two  connecting  posts  each,  30  white,  10  yellow,  10  green,  10 
violet,  and  10  silver  colored  balls  each  with  tubular  attachments  to  slip  on  the  connecting 

posts,   and  15  nickel-plated  binding   posts  with   two  clamps 45.00 

9362.  MODELS,  Valence,  Nead's.  The  blocks  representing  the  positive  elements  are  provided  with  pins 
which  fit  into  corresponding  holes  in  the  blocks  which  represent  the  negative  elements  or  radi- 
cals. On  each  block  is  a  clip  for  holding  a  card  on  which  is  printed  the  symbol  of  the  element 
represented.  With  these  blocks  valence,  the  idea  of  bonds  between  the  atoms  in  combination, 
and  equation  writing  are  made  perfectly  clear.  The  set  includes  12  blocks  for  univalent  elements, 
6  for  bivalent,  and  4  for  trivalent,  half  of  each  being  positive,  and  100  printed  cards  for  symbols 

of  elements  and  radicals 5.00 

MOIST  CHAMBERS,  see  Culture  Dishes. 
MOISTURE  TESTERS,  see  Grain  Testing  Apparatus. 

MOLD,  Briquette,  see  Asphalt  Testing  Apparatus;  Cement  Testing  Apparatus. 
MOLDS,  Cement,  see  Cement  Testing  Apparatus. 
MOLDS,  Cupel,  see  Cupel  Molds. 
9368.     MOLD,  Pouring,  of  cast  iron  with  wood  handle,  with  3  conical  depressions  2x1%  inches  each, 

tapering  to  a  fine  point,  for  crucible  and  scorification    assays 75 

9370.     MOLD,  Pouring,  of  heavy  solid  iron,  with  six    conical    machine    drilled    depressions,    21/4xl% 

inches  each,  with  iron  handle,  for  crucible  and  scorification  assays 2.50 

9372.     MOLD,  Pouring,  of  cast  iron,  with  wood  handle  and  two  smooth  drilled  cavities 1.50 

9374.  MOLDS,  Pouring,  cast  iron,  with  wood  handle  and  round  holes,  for  crucible  and  scorification 
assays. 

Number   of  cavities 6  12 

Each    75  2.25 

MOLECULAR   WEIGHT   DETERMINATION    APPARATUS,    see    Physical    Chemistry    Appa- 
ratus. 

F711.">.  MONOCHROMATIC  FLAME  ATTACHMENT  for  Bunsen  burners.  A  small  reservoir  which 
slips  over  the  top  of  the  burner  is  provided  with  an  asbestos  wick  at  the  center.  This  wick 
surrounds  the  mouth  of  the  burner  closely  and  feeds  up  to  the  flame  any  solution  placed  in  tho 
reservoir.  The  flame  is  therefore  continuously  colored  with  the  characteristic  color  of  the  salt 
which  is  in  the  solution,  and  frequent  renewals  are  not  necessary,  as  only  a  small  portion  of  the 
dissolved  substance  is  consumed.  As  the  water  evaporates  more  is  easily  supplied.  For  any 

burner  with  %0-ineh  tube > 1.50 

9384.     MORTAR,  Diamond,  Leed's  Form,   of  hardest  steel.    Pestle  50x15  mm 3.50 

9386.     MORTARS,  Diamond,   Plattner's,   of  hardest  steel. 

No A  B 

Diameter  of  pestle,  mm 15  25 

Each    4.50          6.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


367 


No.  9390. 


No.  9394. 


No.  9396. 


No.  9388. 

9388.  MORTARS,  Glass,  with  pestle. 

No 

Capacity,  ounces 

Diameter  outside,  inches. . 
Each 


No.  9402. 


9390.   MORTARS,  Iron,  vase  shape,  heavy,  with  pestle. 

No '       A  B 

Capacity,  pints 1  2 

Size,  inches 4V>xa  5V>x6 

Each    .  1.20  1.60 


A 

2 

2% 
$0.26 


B 

4 

4 

.40 


C 

4 


2.25 


C 

8 

4% 
.50 

I) 

gallons       1 
8x7 
3.50 


D 

16 

5 
.80 


E 

32 

6 

1.20 

E 
2 


6.40 


9394.     MORTARS,  Iron,  Buck's,  for  grinding  and  amalgamating.     By  rotation  of  the  muller,  a  large 
sample  of  quartz  may  be  ground  in  contact  with  mercury. 

No ". A  B 

Diameter  outside,  inches 6%  8% 

Total  weight,  pounds 30  76 

Weight  of  muller,  pounds 16  49 

Each    10.00  12.50 

9396.    MORTARS,  Porcelain,  with  spout  and  pestle ;  glazed  outside,  rough  inside. 

Outside  diameter,  mm 65          80       100        110        130         150          16o          185          213 

Eacli 35         .50        .60         .70         .95         1.25         1.35         1.55         2.20 

9402.    MORTARS,  Wedgewood,  acid  proof,  pestle  with  wood  handle. 

No 0000     000      00         0          1           2            3            4            5  6 

Diameter  outside,  inches 3        3%        4        4V,        5  5%  6%  7%           8  9 

Each 68       .76      .86       .92*    1.00  1.20  1.40  1.60  1.90  2.30 

MORTAR,  Automatic  Grinding,  see  Crushing  and  Grinding  Apparatus. 

MOTORS,   Electric,   see  Electrical  Instruments. 

MOTOR-GENERATORS,  see  Electrical  Instruments. 

MOUSE  JARS,  see  Animal  Holders. 

MUFFLE  FURNACES,  see  Furnaces. 

MUFFLES  for  Gas  and  Oil  Heated  Furnaces,  see  Furnaces,  Muffle. 

MUFFLES,  Alundum,  see  note  under  Muffles,  Opaque  Fused  Silica. 

MUFFLES,    Clay,    all    kinds    and    sizes,    send  for  special  bulletin  giving  sizes  and  prices. 

MUFFLES,  Opaque  Fused  Silica,  see  note  below. 

Note:— Owing  to  the  great  variety  of  sizes  and  shapes  of  muffles  in  use  throughout  the  coun- 
try, we  have  made  no  attempt  to  offer  a  complete  list  in  this  catalog.  We  shall  be  very 
glad  to  quote  prices  upon  request  upon  muffles  made  of  alundum,  clay  or  silica.  As  it  is  very 
important  that  the  muffle  shall  fit  the  space  for  which  it  is  ordered,  we  urge  that  orders  or 
requests  for  prices  be  accompanied  by  (1)  a  list  of  dimensions  both  outside  and  inside,  (2) 
a  statement  as  to  whether  both  ends  are  open  or  one  closed,  and  (3)  a  sketch  showing  the  exact 
shape  of  the  cross  section  of  the  old  muffle. 

MUSEUM  JARS,  see  Jars. 


368  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  9408. 


No.  9450.  No.  9410. 

MOTORS,  WATER 

9108.  MOTOR,  WATEE,  5  inches  in  diameter;  may  also  be  used  witn*  steam  or  compressed  air.  Has  a 
two-speed  steel  pulley  for  %2'*n-  round  belt-  Attains  the  following  speeds,  depending  on  the 
water  pressure. 

Water  pressure,  Ibs 20  30  40  50  60 

No.  of  r.  p.  in 2300  2800  3400  3850  4200 

This  motor  may  be  attached  to  an  ordinary  apparatus  stand  and  used  for  either  stirring  or  shak- 
ing.    The  inlet  pipe  is  threaded  1A  in.  I.  P.  thread $7.50 

9410.  MOTOE,  CENCO  WATEE,  a  reliable  motor  made  by  one  of  the  largest  manufacturers  of  water 
motors  and  fully  guaranteed.  This  motor  will  be  found  useful  for  power  in  grinding,  buffing, 
etc.,  and  as  a  test  of  efficiency  in  the  laboratory,  also  in  connection  with  bottle  washing  brushes, 
for  the  rapid  cleaning  of  bottles,  flasks,  etc.  Diameter  4  inches,  weight  5  pounds.  With  80 
pounds  water  pressure  will  develop  %  h.  p.  when  connected  with  y2-inck  house  pipe.  Com- 
plete with  4-inch  beveled  face  emery  wheel,  one  felt  buffing  wheel  for  brass  and  silver,  one 
cake  of  brass  and  silver  polish,  one  grooved  wood  pulley  for  ifa-inch  round  belt  (see  No.  F2857), 
and  coupling  for  threaded  faucet 5.00 

9412.  MOTOE,  CENCO  WATEE.  Same  design  as  No.  9410.  Diameter,  6  inches;  weight,  7  pounds. 
With  80  pounds  water  pressure  will  develop  %  h.  p.  when  connected  with  %-inch  house  pipe. 
Complete  with  grooved  wheel  for  %2-in<ih  round  belt  (see  No.  F2857),  and  coupling  for  threaded 
faucet,  but  without  other  accessories 8.00 

9416.  MOTOE,  CENCO  WATEE,  Demonstration  Form.  Same  as  No.  9410  Water  Motor,  but  with  one 
side  of  glass  so  that  the  action  of  the  water  wheel  may  readily  be  inspected 6.00 

ACCESSOEIES  FOE  CENCO  WATEE  MOTOES. 

9417.  UNIVEESAL  COUPLING  for  plain  faucet  (state  outside  diameter) .40 

9418.  EXTEA  ETJBBEE  for  No.  9417  (state  outside  diameter  of  faucet) 15 

9419.  STEEL  POLISH    15 

9420.  QUAET  BOTTLE  WASHEE 75 

9421.  PINT  BOTTLE  WASHEE 75 

9422.  EMEEY  WHEEL,  beveled  edge,  4-inch  diameter,  %6-inch  hole.     Regularly  furnished  with  No. 

9410    1.00 

NOTE:  '  The  above  three  accessories  are  for  use  on  Nos.  9410  and  9416  Cenco  Water  Motors. 
They  may  be  used  on  No.  9412  Cenco  Water  Motor  if  No.  9423  Stud  Shaft,  listed  below,  is 
purchased. 

9423.  STUD  SHAFT,  for  attaching  to  the  shaft  of  No.  9412  Cenco  Water  Motor,  to  permit  the  use  of 

Nos.  9420  to  9422  Accessories 1.00 

9450.  NAIL  SETS,  made  of  high  grade  steel,  4  inches  long,  both  ends  hardened,  centers  nicely  knurled, 
tips  concaved,  tops  oval  and  the  size  exact. 

No A  B 

Diameter  at  tip,  inches l^6  i£ 

Each 15  .15 

NIPPEES.  see  Pliers. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


369 


Nos.  7508-9. 


Nos.  9462-4. 


NITROGEN  DETERMINATION  APPARATUS 

9460.  KJELDAHL  APPARATUS  for  Nitrogen  Determinations,  consisting  of  Condenser  No.  9461  of 

polished  copper  with  block  tin  tubes  and  Digestion  Shelf  No.  9462  of  sheet  iron,  with  burn- 
ers provided  with  individual  stop-cocks.  Without  glass  flasks. 

No   A  B 

Numbers  of  burners 6  10 

Each    $53.50        75.00 

9461.  KJELDAHL  CONDENSERS  only  of  No.  9460,  made  of  polished  copper  tin  lined,  with  coils  of 

pure  block  tin  tubing.     Width  at  top,  6%    inches;    depth,    14   inches;    height  including   legs, 

24  inches. 

No A               B 

Number  of  coils 6               10 

Length,  inches 24              40 

Each    36.00        50.00 

9462.  KJELDAHL  DIGESTION  SHELVES  only  of   No.   9460,  made  of   sheet   iron   with  iron   rod   to 

support  flasks,  mounted  on  adjustable  legs.  A  special  feature  of  this  shelf  is  the  separate 
stop-cock  key  provided  to  prevent  burning  the  fingers  when  adjusting  the  flame.  Height  of 
apparatus  to  top  of  sheet  iron  shelf,  9%  inches;  width,  5%  inches. 

No A  B 

Number   of   burners .' 6  10 

Length  of  shelf,  inches 24  40 

Each    17.50        25.00 

9464.     KJELDAHL  DIGESTION  SHELVES,  same  as  Xo.  9462,  but  furnished  with  burners  for  gaso- 
line gas. 

No A  B 

Number  of  burners 6  10 

Each 22.00         32.50 

6268.     EXTRA  STOP-COCK  KEY  for  Nos:  9462  and  9464   1.00 

KJELDAHL  DIGESTION  SHELVES,  electrically  heated,  with  individual  hot  plates  3%  inches 
in  diameter,  each  of  which  has  a  separate  snap  switch  permitting  any  one  or  all  to  be  used 
at  a  time.  Made  of  sheet  iron  with  support  for  flasks.  Height  to  top  of  shelf,  9  inches; 
width,  5%  inches. 

No A  B 

Number  of  hot  plates 6  10 

Length,   inches 24  40 

7508.  For  110  volts 57.75         90.75 

7509.  For  220  volts 57.75         90.75 


370 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  9484-6. 


Nos.  9476-8. 


No.  9490. 


9476.  KJELDAHL  DISTILLING-  APPARATUS,  wall  form.  All  working  parts  of  the  apparatus  are 
readily  accessible  from  the  front.  The  burners  are  provided  with  stop-cocks  for  individual 
regulation  so  that  any  or  all  of  the  burners  may  be  used  at  once.  The  condenser  tank  is 
of  heavy  copper  with  block  tin  condenser  tubes.  With  6  burners  but  without  glassware  $55.00 

9478.  KJELDAHL  DISTILLING  APPARATUS,  same  as  No.  9476,  but  with  burners  for  gasoline 
gas  60.00 

9480.  KJELDAHL  DISTILLING  APPARATUS,  same  as  No.  9476,  but  with  supports  to  stand  on  the 
table.  With  6  burners ; 60.00 

9484.  KJELDAHL  DIGESTION  SHELVES.   Johnson's,  consisting  of  a  shelf  of  iron  about  6  inches 

wide  and  8%  inches  high,  with  holes  4%  inches  from  center  to  center.  The  necks  of  the 
flasks  rest  in  holes  in  a  large  lead  tube  to  be  connected  with  a  chimney  so  that  all  fumes 
are  carried  away.  Complete  with  Bunsen  burners,  with  stop-cocks  with  separate  key,  but 
without  flasks,  lead  pipe,  or  support  for  pipe. 

No A  B  C 

Number   of  burners .• 6  10  13 

Approximate    length,    inches 30  50  65 

Each    22.50         27.50         32.50 

6268.     EXTRA  STOP-COCK  KEY  for  No.  9484 1.00 

9485.  LEAD  TUBING  for  use  with  No.  9484,  inside  diameter,  4  inches per  foot      1.00 

9486.  LEAD  TUBES  for  No.  9484,  inside  diameter  4  inches,  complete  with  holes  for  necks  of  flasks. 

and  with  support.  With  outlet  tube  12  inches  long,  located  in  middle  of  long  tube,  unless 
specified  otherwise  in  ordering. 

No A  B  C 

Number  of  holes 6  10  13 

Each    15.00        18.00        20.00 

9490.  KJELDAHL  DIGESTION  APPARATUS,  Sy's  Fumeless,  permitting  digestions  to  be  made 
without  the  use  of  a  hood,  provided  a  water  supply  and  drain  are  available.  The  glass  fil- 
ter pump  effectually  disposes  of  the  fumes  as  they  are  generated.  Complete  with  support 
stand,  clamps,  quadruple  burner,  filter  pump,  four  bulb  tubes  and  four  500  cc  Kjeldahl  flasks 
of  Pyrex  glass.  (See  Journal  of  Industrial  and  Engineering  Chemistry,  Vol.  IV  No.  9,  for 
September  1912) 18-00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


371 


No.  9524. 


9494. 


9498. 
9500. 


9504. 
9506. 


KJELDAHL  DIGESTION   SHELF,   round  form,  with  openings  for  six  flasks  and  support  ad- 
justable  in  height  for  the  necks.     Diameter,   16   inches;   height,   10   inches.     Complete   with 

6  burners,  each  with  stop-cock $20.00 

KJELDAHL  CONNECTING  BULB,  original    design    50 

KJELDAHL  CONNECTING  BULB,  same  as  No.  9498,  but  with  straight   connecting   tube   for 

bending  to   any  angle. 50 

9502.  KJELDAHL  CONNECTING  BULB,  as  modified  by  Hopkins.  (See  Journal  of  American  Chem- 
ical Society  No.  3,  1896} 60 

KJELDAHL'  CONNECTING  BULB,  cylindrical  form so 

KJELDAHL   CONNECTING  BULB,  Jenning's,  designed  especially  for  water  analysis  to  per- 
mit introduction  of  reagents  without  removing   stopper    80 

Si512.     DELIVERY  BULB  TUBE,  for  Kjeldahl  Apparatus.    Prevents  sucking  back  of  condensed  liquid 

from   receiving   flask 

For  KJELDAHL  FLASKS,  see  Flasks. 

9518.    NITROGEN  BULB,  Fresenius'     

9520.     NITROGEN  BULB,  Volhard's    

9522.     NITROGEN  BULB,  Volhard's,  latest  form 

9524.     NITROGEN  BULB,  Will-Varrentrap's,  with  three  bulbs 

9526.    NITROGEN  BULB,  Will-Varrentrap's,  with  four  bulbs 50 

NITROMETERS 

9532.  NITROMETER.  Du  Pont,  latest  modification.  Used  by  manufacturers  of  explosives  for  the  anal- 
ysis of  nitric  acid.  etc.  Glass  parts  only  as  illustrated,  with  rubber  tubing  connections.  (See 
Technical  Paper  160  of  the  United  States  Bureau  of  Mines) 35.00 


.35 

.80 
.75 
.75 
.40 


372 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


r 

No. 


9546. 


I 

No.  9550. 


I 

V 

No.  9552. 


No.  9556. 


No.  9560. 


Parts  and  Accessories  for  No.  9532 


9533.  COMPENSATING  TUBE  only,  with  open  tube  for  sealing  when  standardized ,....    $3.00 

9534.  GENERATING  BULB  only,  holding  about  300  cc,  with  two  stop-cocks  and  reservoir 10.00 

9535.  MEASURING  TUBE  only,  graduated  from  10  to  14  per  cent,  in  0.01  divisions 8.00 

9536.  MERCURY  LEVELING  BULBS  only each      1.25 

9537.  THREE-WAY  TUBE  only,  for  connecting  compensating  tube  to  measuring  tubes  and  leveling 

bulb     75 

9538.  UNIVERSAL  TUBE  only,  graduated  from  0  to  100  per  cent,  in  %0  divisions 12.00 

9539.  IRON  SUPPORT  STAND  for  No.  9532,  with  six  upright  rods,  rings  for  the  leveling  bulbs,  clamps 

for  the  tubes,  and  clamps  for  the  upright  and  cross  rods.    Made  to  order  only 22.00 

9546.     NITROMETERS,  Lunge's,  with  three-way  stop-cock  and  plain  leveling  tube. 

Graduated  to,  cc 50  in  \{0     100  in  % 

Each    5.00  5.30 

9550.     NITROMETERS,  Lunge's,  same  as  No.  9546,   but    provided   with    special  .three-way   stop-cock. 
With  plain  leveling  tube. 

Graduated    to,    cc 50  in  }{„     100  in  % 

Each    5.25  6.00 

9552.     NITROMETER,  Lunge's,  for  larger  volumes.     Extensively  used  in  the  determination  of  nitro- 
gen  in   gunpowder   and   explosives.     Graduated  from  100  cc  to  140  cc  in  }£0  cc  divisions,  with 

graduated  leveling  tube 8.00 

9556.     NITROMETER,  ScMff's,  graduated  to  100  ee    in   %   cc    divisions;    on    support    with    reservoir, 
clamp    and   connections.  . 7.00 

9560.  NITROGEN  APPARATUS,  Van  Slyke's,  for  the  Gasometric  Determination  of  the  Aliphatic 

Aniino  Groups.  With  this  apparatus,  a  complete  determination  of  the  nitrogen  in  amino  acids 
can  be  made  in  less  than  10  minutes  with  an  accuracy  equivalent  to  that  of  the  Kjeldahl 
method.  It  has  the  further  advantage  of  permitting  successive  determinations  to  be  made 
without  disconnecting  the  parts.  Any  amount  up  to  10  cc  may  be  analyzed  with  an  accuracy 
of  }£0  milligram  of  nitrogen.  This  apparatus  can  be  used  for  the  study  of  protein  digestion, 
both  in  vitro  and  in  vivo;  the  determination  of  the  nature  of  the  amino  acids  yielded  by 
hydrolysis  of  small  amounts  of  protein;  determination  of  free  amino  groups  in  fixing  the 
constitution  of  various  organic  substances,  and  the  determination  of  amino  acid  nitrogen  in 
urine,  blood  and  tissues.  Complete  with  glass  parts  and  supports,  pulley,  shaking  device  and 
connections,  but  without  electric  motor.  (See  Journal  of  Biological  Chemistry,  Vol.  XII,  page 
275,  for  1911  and  Vol.  XVI,  page  121  for  1913) 42.00 

9561.  GLASS  PARTS  only  of  No.  9560 22.00 

9562.  DEAMINIZING  VESSEL  only  of  No.  9560 14.00 

9563.  GAS  BURETTE  only  of  No.  9560,  with  three-way  stop-cock,  leveling  bulb  and  connecting  tub- 

ing        6.00 

9564.  GAS  PIPETTE  only  of  No.  9560,  for  shaking 2.00 

9566.  NITROGEN  APPARATUS,   Van  Slyke's,   similar   to    No.    9560,    but   smaller   in    size,    so-called 

Micro  size.  Complete  with  supports,  pulley,  shaking  wheel,  and  connections,  but  without 
motor  44.00 

9567.  GLASS  PARTS  only  of  No.  9566 24.00 

9568.  DEAMINIZING  VESSEL  only  of  No.  9566 16.00 

9569.  GAS  BURETTE  only  of  No.  9566 6.00 

9570.  GAS  PIPETTE  only  of  No.  9566 2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  S.  A. 


373 


2361. 
2362. 
9580. 


9600. 
0601, 

9608. 
9609. 
9612. 


•'i   . 


9622. 


No.  9612. 


No.  9609. 


No.  9622. 


No.  9620. 

MOTORS,  Variable  Speed,  for  use  with  Nos.  9560  and  9566. 

For  110  volts $23.00 

For  220  volts 23.00 

NOMON,  a  Calculating  Chart,  Chemists'  Edition,  designed  by  Horace  G.  Doming  of  the  Uni- 
versity of  Illinois.  This  device  consists  of  a  set  of  18  sections  bound  together  in  book  form, 
each  section  containing  13  engine  divided  scales,  with  about  40,000  separate  points  or  sub- 
divisions. By  means  of  the  Nomon,  the  mathematical  operations  of  multiplication,  division, 
raising  to  powers,  extracting  roots  and  determination  of  reciprocals  can  be  performed  rapidly 
and  with  an  accuracy  five  times  as  great  as  with  an  ordinary  slide  rule.  In  addition  practi- 
cally all  the  special  mathematical  operations  peculiar  to  chemistry  and  chemical  engineering 
can  be  performed  easily  and  accurately.  Complete  with  book  of  scales,  two  sheets  of  recip- 
rocal cross  section  paper,  five  place  table  of  logarithms,  and  a  manual  of  instructions  con- 
taining tables  of  chemical  data  and  factors  conveniently  arranged  for  use 1.00 

OIL  CAN,  zinc,  diameter  2  inches,  22  cc  capacity   10 

OIL  CAN,  same  as  Xo.  9600,  filled  with  fine  sperm  oil  .25 

OIL  SAMPLE  BOTTLES,  see  general  heading  Bottles. 

OIL  STONE,  Washita,  genuine,  5-inch,  unmounted 60 

OIL  STONE,  Washita,  Mounted,  same  as  No.  9608,  mounted  in  case 70 

OIL  STONE,  Washita  Slip,  beveled  with  rounding  edge,  for  gouges  and  fine  tools.  Length,  4 
inches .30 

OIL  TESTING  APPARATUS 

CALORIMETERS,   see   general  heading  Calorimeters. 

CENTRIFUGE,  Hand  Driven,  high  speed,  giving  1000  to  3000  revolutions  per  minute.  The  case 
is  of  iron  well  finished,  the  bearings  of  phosphor  bronze  accurately  machined,  the  gear 
wheels  of  hard  bronze  cut  by  special  machinery  and  the  pitch  so  calculated  as  to  render 
the  machine  almost  noiseless  in  operation.  Complete  with  disengaging  handle,  two-tube  arm 
with  conical  shields,  and  with  two  Graduated  Glass  Tubes,  No.  9631,  reading  directly  in  per- 
centage of  B.  S " .  30.00 

CENTRIFUGE,  Water  Motor,  similar  in  construction  to  No.  9620,  but  operated  by  a  ball-bear- 
ing water  motor.  The  shaft  is  suspended  on  hardened  steel  ball-bearings  in  such  a  way  that 
the  water  cannot  come  in  contact  with  the  bearing  surfaces.  In  this  way  all  danger  of  rust 
or  clogging  is  avoided.  Complete  with  3  feet  of  pressure  tubing,  hose  connection  for  ordi- 
nary smooth  faucet,  two-tube  B.  S.  arm,  and  two  Graduated  Glass  Tubes  No.  S631,  reading 
directly  in  percentage  of  B.  S 24.00 


374 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


9624. 


9626. 

9627. 
9628. 
9629. 

9630. 
2556. 

9631. 

9632. 
2558. 

9640. 


Nos.  9624-6. 


No.  2556.    No.  9631. 


No.  9640. 


CENTRIFUGE,  Electric,  for  110  volts,  mounted  on  heavy  enameled  cast  iron  base,  enclosing 
the  motor.  The  shaft  is  accurately  centered,  preventing  vibration.  The  motor  is  carefully 
constructed  for  centrifuge  work  and  is  so  wound  that  by  shifting  a  single  contact  in  the  base, 
it  can  be  changed  from  A.C.  to  D.C.  or  vice  versa.  It  is  not  a  universal  motor.  A  rheostat 
in  the  base  provides  for  three  different  speeds.  Complete  with  two-tube  B.  S.  arm  with  con- 
ical shields,  two  Graduated  Glass  Tubes  No.  9631  reading  directly  in  percentage  of  B.  S., 
attachment  cord  and  plug $59.75 

CENTRIFUGE,  Electric,  same  as  No.  9624,  but  wound  for  220  volts  A.C.  or  D.C.  The  change 
from  A.C.  to  D.C.  or  vice  versa  is  made  as  in  No.  9624,  by  shifting  a  single  contact  in  the 
base  62.75 

Parts  and  Accessories  for  Centrifuges. 

ARM,  Revolving,  B.  S.,  for  Centrifuges  Nos.  9620  and  9622,  with  trunnion  rings  and  with  two 
conical  metal  shields  for  use  with  100  cc  Glass  Tubes  No.  9031 17.30 

ARM,  Revolving,  B.  S.,  same  as  No.  9627,  but  made  only  for  Centrifuges  Nos.  9624  and 
9626  18.75 

ARM,  Revolving,  for  Nos.  9620-9622,  with  two  trunnion  rings  and  metal  tube  shields  for  use 
with  50  cc  glass  tubes  No.  2556,  for  the  examination  of  kerosene 17.30 

ARM,  Revolving,  same  as  No.  9629,  but  made  only  for  Centrifuges  Nos.  9624  and  9626. .     18.75 

GLASS  TUBES,  Graduated,  for  use  with  Nos.  9629-30,  for  the  examination  of  kerosene.  Capac- 
ity, 50  cc,  graduated  to  read  to  %  cc  in  the  tip each  1.00 

GLASS  TUBES,  Graduated,  for  use  with  Nos.  9627-8,  for  the  determination  of  B.  S.  in  oils. 
Capacity,  100  cc,  graduated  in  200  parts.  As  equal  parts  of  oil  and  gasoline  are  mixed  in  mak- 
ing this  test,  this  graduation  enables  the  B.  S.  to  be  directly  in  percentage.  By  means  of 
the  narrow  tip,  amounts  as  small  as  i{0  of  1  per  cent,  can  be  measured each  1.50 

METAL  SHIELDS,  for  use  with  Arms  Nos.  9627  and  9628,  for  holding  B.  S.  Tubes  No. 
9631 each  1.50 

METAL  SHIELDS,  for  use  with  Arms  Nos.   9629   and   9630,   for   holding   Kerosene   Tubes   No. 

2556 i each        .85 

For  other  CENTRIFUGES,  see  general  heading  Centrifuges. 

DISTILLATION  APPARATUS,  for  determining  boiling  and  end  points  of  gasoline,  petroleum 
oils  and  paint  thinners,  according  to  the  design  of  Sub-Committee  XI  of  Committee  D-l  of 
the  American  Society  for  Testing  Materials.  This  apparatus  is  recommended  as  standard 
for  the  testing  of  motor  gasoline  by  the  United  States  Bureau  of  Mines.  The  apparatus 
consists  of  a  copper  condenser  trough  with  brass  condenser  tube  and  support;  a  burner  guard 
of  galvanized  iron  lined  with  asbestos,  with  door  and  hand  opening;  a  Bunsen  burner  adjust- 
able for  air  and  gas;  3  feet  of  rubber  tubing  to  connect  burner  with  gas  supply;  a  support 
stand  with  4-inch  ring;  asbestos  mat  5x5  inches  with  la/4-inch  circular  opening;  two  clamps 
for  supporting  flask  and  burner;  Engler  flask,  100  cc;  two  corks  for  same,  with  hole  for 
thermometer;  thermometer  graduated  to  270°C.,  according  to  specifications  of  the  Bureau  of 
Mines;  cork  to  connect  Engler  flask  with  condenser  tube;  graduated  cylinder,  100  cc  capac- 
ity; and  piece  of  fiber  board  to  fit  over  end  of  condenser  tube  and  cover  cylinder.  Complete 
as  illustrated,  with  directions  for  use.  (See  Standards  of  the  American  Society  for  Testing 
Materials  adopted  in  1917,  page  8;  Technical  Paper  166  of  the  United  States  Bureau  of 
Mines)  25.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


375 


No.  9650. 


No.  9652. 


No.  9654. 


No.  9658. 


Parts  and  Accessories  for  No.  9640. 

2194.  BUHNER,  Alcohol  Lamp,  for  use  with  Xo.  9640  when  gas  is  not  available.  Burns  with  intensely 
hot  blue  Bootless  flame,  using  denatured  alcohol.  Burns  3  hours  at  one  filling $3.50 

9641.  CONDENSER  only  of  Xo.  9640,  made  of  polished  copper  with  stop-cock  for  draining,  with  inner 
tube  of  brass  22  inches  long  and  %  inch  inside  diameter,  mounted  on  iron  supports.  Length 
of  condenser,  15  inches;  height  over  all,  1"  inches 12.00 

9<>42.  CORKS,  specially  selected  for  use  in  distilling  flasks,  sizes  No.  6,  7,  and  8  assorted,  in  bags 
of  100 '. per  bag  1.25 

9643.  FIBER  BOARD,  with  hole  to  fit  over  end  of  condenser  tube  and  prevent  escape  of  gas  from 

receiving  cylinder .10 

FLASKS.  "Distilling,  Engler,  see  general  heading  Flasks. 
GRADUATES,  Cylindrical,  see  general  heading  Cylinders. 

9644.  GUARD,  for  burner,  of  galvanized  iron  lined  with   asbestos 7.50 

13622.  THERMOMETER  for  Distillation  of  Gasoline,   graduated  to   read  from   0°   to   270°C.     Made 

according  to  specifications  of  the  United  States  Bureau  of  Mines.  Thermometers  of  other 
ranges  or  with  Fahrenheit  scale  can  be  furnished  shortly  after  receipt  of  order,  if  desired. 

(See  Technical  Paper  166,  May  1917,  page  21) 4.15 

13624.  THERMOMETER.  Solid  Stem,  Engraved  Scale,  same  as  No.  13622,  but  graduated  from  20"  to 
520°F..  in  2°  divisions 4.15 

9645.  ASBESTOS  MAT,  5  inches  square,  with  circular  opening  114  inches  in  diameter,  for  shielding 

sides  of  flask  from  direct  flame 10 

FLASH  POINT  TESTERS 

9650.  FLASH  POINT  TESTER,  Cleveland  Open  Cup,  for  high  grade  lubricating  oils,  made  of  heavy 
brass  castings.  Complete  with  standard  solid  stem  thermometer,  graduated  from  20  to  720°F[, 
with  spirit  lamp  and  Bunsen  burner  for  gas  13.20 

9'i.")2.  FLASH  POINT  TESTER,  Cleveland  Open  Cup,  similar  to  Xo.  9650,  but  smaller  and  of  lighter 
construction.  Complete  with  solid  stem  thermometer  and  Bunsen  burner 8.80 

13636F.  THERMOMETER  only  for  Xos.  9650  and  9652,  graduated  from  20"  to  720°F.,  in  2°  divi- 
sions    4.95 

9654.  FLASH  POINT  TESTER,  Elliott's,  for  illuminating  oils   only.     Adopted   as   standard   by   the 

states  of  Xew  York,  Xew  Jersey,  Iowa  and  Michigan.  Complete  with  glass  cover,  standard 
solid  stem  thermometer  graduated  to  300°F.,  lamp,  thermometer  holder,  and  directions  for 
use  13.20 

9655.  PERFORATED  GLASS  COVERS  for  Xo.  9654    each        .50 

13636B.  THERMOMETER  for  Xo.  9654,  graduated  from  20°  to  300"F.,  in  1°  divisions 2.65 

965S.     FLASH  POINT  TESTER,  Foster's,  for  illuminating  oils  only.     Complete  with  standard  solid 

stem  thermometer  graduated  to  190°F.,  alcohol  lamp,  and  directions  for  use 14.30 

9659.  THERMOMETER  for  Xo.  9658,  graduated  from  60°  to  190"F..  in  1°  divisions,  with  metal 
scale  2.00 


376 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  9662. 


No.  9668. 


No.  9676. 


9662. 
9663. 

9664. 
9668. 

9669. 

9670. 
9676. 

9677. 
9678. 
13608, 


FLASH  POINT  TESTER,  Abel-Pensky,  United  States  Bureau  of  Mines  Modification,  for  oils 
flashing  from  0°  to  110°C.,  with  clock  work  to  open  cup  and  apply  flame.  Complete  with  three 
thermometers,  stirring  device,  cup  lifter,  burner  and  aneroid  barometer,  in  portable  case  with 
instructions  for  operation.  (See  Technical  Paper  No.  49  of  the  United  States  Bureau  of 
Mines) $148.50 

THERMOMETERS  for  No.  9662,  for  use  in  oil  cup.  With  round  bulb,  graduated  in  %°  divi- 
sions. 

No .- A  B 

Range,   degrees   C 0-50       40-110 

Each 8.25          8.25 

THERMOMETER  for  No.  9662,  for  use  in  water  bath,  with  cylindrical  bulb,  graduated  from 

0°   to  85°C.  in  1°   divisions " 8.25 

FLASH  POINT  TESTER,  Pensky-Martin,  United  States  Bureau  of  Mines  Modification,  for  oils 
flashing  from  100°  to  310°C.  Consists  of  an  oil  cup  with  cover,  fitted  with  stirrer,  clockwork 
mechanism  as  in  No.  9662  for  opening  cup  and  applying  flame,  and  an  air  bath.  Complete  with 
two  thermometers,  cup  lifter  and  burner,  in  portable  case  with  instructions  for  operation. 
(See  Technical  Paper  No.  49  of  the  United  States  Bureau  of  Mines) 132.00 

THERMOMETERS  for  No.  9668,  for  use  in  oil  cup,  with  round  bulb,  graduated  in  1°  divisions. 

No A  B  C 

Range,   degrees   C 100-210     200-310     300-410 

Each    8.25  8.25  9.90 

OIL  CUP  only  for  Nos.  91)1)2  and  90(58 8.25 

FLASH  POINT  TESTER,  Open  Form,  for  illuminating  oils.     Complete  with  alcohol  lamp,  and 

standard  paper  scale  thermometer 6.60 

GAS  FLAME  TESTING  BURNER  for  use  with  No.  9676  for  dip  or  bar  tost.     With  stop-cock 

to   control  size   of  flame  and  hose   for   attachment    to   gas   supply 2.00 

GLASS  CUPS  only  for  No.  9676 ". each        .35 

per  dozen     3.30 
THERMOMETER  for  No.  9676,  graduated  f :om  — 20  to  230°F.  in  1°  divisions 3.30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


377 


No.  9686. 


No.  9706. 


No.  9694. 

FLASKS,  Distilling.  Engler,  see  general  heading  Flasks. 

FLASKS,  Distilling,  Hempel,  see  general  heading  Flasks. 

9686  FREEZER,  TagliaTrae  Oil,  for  determining  the  congealing  point  of  oils.  Consists  of  an  oil-cool- 
ing chamber,  containing  a  receiver  mounted  on  a  rocking  shaft  to  facilitate  the  introduction 
of  the  oil  cup  and  to  show  whether  congealing  is  taking  place;  and  an  ice  chamber  with  dram 
faucet,  surrounded  by  a  heavy  insulating  jacket.  A  glass  door  enables  the  operator  to  observe 
the  operation  at  all  times.  Two  stop-cocks  are  connected  with  the  oil-cooling  chamber  to 
enable  air  to  be  blown  through  to  control  the  temperature.  Complete  as  described  with  three 
special  standard  angle  thermometers •  • ;  f52-80 

Note: — This  instrument  is  furnished  to  order  only  and  we  can  not  promise  immediate  ( 

GAGE  RODS,  FOR  DETERMINING  CAPACITY  OF  BARRELS 

9692.     GAGE  ROD,  of  seasoned  maple,  36  inches  long 

9694.     GAGE  ROD,  of  seasoned  lancewood.  36  inches  long,   with   steel  point,   ivory   face,  brass   back 

and  indicating  slide,  graduated  to  120  gallons 5.77 

9696.     GAGE  ROD,  similar  to  No.  9694,  but  made  to  fold  to  18  inches 6.16 

9698.     GAGE  ROD,  of  solid  tool  steel,  with  hardwood  handle,  ivory  face,  and 

indicating  slide,  graduated  to  120  gallons 9.90 

HYDROMETERS,  for  Oil  Testing,  see  general  heading  Hydrometers. 

9706.  LUBRICATION  TESTER,  Thurston's,  for  testing  the  lubricating  quality 
of  oils  by  means  of  the  friction  of  a  bearing  on  a  rotating  shaft.  A 
heavy  pendulum  measures  by  its  deviation  the  friction.  The  machine 
automatically  records  the  pressure  per  square  inch,  the  total  pressure 
on  the  iournal,  the  total  friction  and  the  temperature  of  the  bearing. 
F.  O.  B.  .  .Philadelphia  350.00 

Note: — This  instrument  is  furnished  to  order  only  and  we  cannot  promise 
immediate  delivery. 

9710.  MANUAL  for  Inspectors  of  Petroleum,  containing  correction  tables  for 
hydrometers,  enabling  the  true  gravity  at  any  temperature  to  be  deter- 
mined at  a  glance -20 

9714.  MELTING  POINT  TESTER,  Tagliabue's  for  Wax.  Requires  only  a  tea- 
spoonful  of  material  and  enables  a  test  to  be  made  in  ^  of  the  usual 

time.     Complete  with  two  standard  thermometers 26.40 

Note: — This  instrument  is  furnished  to  order  only  and  we  cannot  promise 
No.  9714.  immediate  delivery. 


378 


CENTKAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  9716. 


No.  9724. 


No.  9730. 


9716.  MELTING  POINT  TESTER,  for  Wax,  consisting  of  a  glass  cup  for  the  wax  to  be  tested,  with 
a  removable  metal  top  in  which  is  set  a  thermometer  graduated  from  90°  to  150°F.,  in  %° 
divisions.  The  melted  wax  is  poured  into  the  cup  until  it  stands  at  an  indicated  level.  The 
cap  with  thermometer  is  then  put  in  place  and  the  instrument  shaken  until  the  wax  shows 
signs  of  congealing.  The  thermometer  is  then  observed  and  the  temperature  at  which  the 
mercury  remains  constant  while  the  process  of  congealing  continues  is  noted  as  the  melting 
point.  By  means  of  this  instrument  the  melting  point  of  a  wax  may  be  measured  within 
Vi°F.  Complete  as  described  with  nickeled  trimmings  and  with  thermometer $10.00 

9720.  OIL  TABLES,  Tycos,  containing  all  the  data  concerning  gravities,  temperatures,  conversion 
tables,  etc.,  which  are  of  interest  to  the  oil  man  1.00 

9724.  OIL  TUBE,  Muter's,  for  determining  fatty  acids  in  oils  and  fats.  Graduated  from  0  to  100  cc 
in  1  cc  divisions,  with  ground  stopper  and  stop-cock,  on  wooden  support.  (See  Journal  of 
Association  of  Official  Agricultural  Chemists,  Vol.  II,  No.  3,  for  November  15,  1916,  page 
309) 5.50 

SAMPLE  BOTTLES,  for  Oil,  see  general  heading  Bottles. 
SEPABATOEY  FUNNELS,  see  general  heading  Funnels. 

9730.  STILL,  Brown  Oil,  for  fractionations  and  general  distillations,  constructed  to  meet  the  most 
exacting  requirements.  Th6  still  is  made  of  east  iron  surrounded  by  a  cast  iron  frame, 
mounted  inside  of  a  fire-brick  furnace  of  the  same  general  shape.  The  flame  from  the  Bun- 
sen  burners  plays  between  the  frame  surrounding  the  still  and  the  fire-brick  furnace.  The 
still  proper  is  heated  only  by  heat  which  passes  through  the  walls  of  the  iron  frame  sur- 
rounding it.  By  this  construction  the  top  and  bottom  of  the  still  may  be  kept  at  the  same 
temperature;  or,  if  desired,  the  top  can  be  kept  heated  to  a  higher  temperature,  or  vice 
versa,  by  a  slight  adjustment  of  the  flame  entering  the  fire  chamber.  It  is  necessary  when 
running  an  emulsified  oil  to  keep  the  top  of  the  still  somewhat  hotter  than  the  bottom.  The 
still  permits  the  use  of  a  sample  sufficient  in  size  to  afford  cuts  that  can  be  treated  or 
otherwise  examined;  and  it  fractionates  where  fractionation  is  desired.  Two  large  Bunsen 
burners  are  included;  one  for  heating  the  still,  and  one  for  generating  steam.  Capacity  of 
still,  one  gallon  (half  full).  Complete  as  described  with  four  vapor  lines  and  discharge 
pipes,  condenser  with  four  compartments,  discharge  outlet,  steam  generator  and  super-heater, 
Bunsen  burners,  three  thermometer  openings  and  large  opening  for  cleaning  purposes,  with 
directions  for  uee '. 135.00 

For  other  STILLS  for  Oil,  see  general  heading  Distilling  Apparatus. 
STOP  WATCHES,  see  general  heading  Stop  Watches. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


379 


No.  9738. 


No.  9742. 


No.  9748. 


B738. 


974?. 


974<i. 
9748. 


TESTER,  Mackey's  Spontaneous  Combustion,  for  testing  oils  or  oily  mixtures  for  liability  to 
produce  spontaneous  combustion.  The  apparatus  consists  essentially  of  a  double  walled  cyl- 
indrical copper  water  bath  with  asbestos  packed  cover,  carrying  two  air  circulation  tubes. 
Height  inside,  7  inches;  diameter  inside,  4  inches.  Complete  with  thermometer  reading  from 
0°  to  250°C.,  6  wire  gauze  cylinders,  1  pound  absorbent  cotton,  Bunsen  burner,  support  stand 
and  50  cc  graduated  cylinder $25.00 

THERMOMETERS,  see  general  heading  Thermometers. 

THIEF.  Blackmar  Oil,  for  taking  samples  from  either  top,  center  or  bottom  of  tank  cars,  or 
other  storage  vessels.  The  receptacle  remains  closed  until  the  desired  point  is  reached,  when 
by  dropping  a  lever  it  fills  up  and  the  oil  is  held  intact  until  delivered  into  a  container.  The 
instrument  will  take  8-ounce  samples  and  operate  to  a  depth  of  12  feet.  Oil  thief  is  in  a  zinc 
case,  complete  with  8  eight-ounce  cork  stoppered  bottles  fitted  into  separate  compartments 
in  a  substantial  carrying  ease  25x11x3^  inches,  with  lock  and  handle 32.00 

THIEF.  Blackmar  Oil,  only  of  Xo.  9742,  in  zinc   case    16.00 

THIEF,  Glass,  for  Oil,  simple  form  with  rubber    bumber 2.85 

THIEF,  Rorrison  Oil,  consisting  of  a  heavy  glass  tube  with  a  capacity  of  12  ounces,  mounted  in 
a  brass  frame  with  special  valve  at  the  bottom,  which  is  automatically  closed  by  striking  an 
adjustable  nut  when  the  proper  depth  is  reached.  In  this  way  correct"  samples  may  be  taken 
at  any  depth.  Complete  with  depth  rod  permitting  samples  to  be  taken  at  any  depth  np  to 
4  feet  from  the  bottom  of  the  tank ' 17.00 

Note: — Longer  rods  may  be  secured  with  No.  9748  at  a  slight  additional  cost. 


No.  9756. 


VISCOSIMETERS 


No.  9758. 


9756.  VISCOSIMETEE,  Engler.  latest  form,  for  light  and  heavy  oils.  Consists  of  gold-plated  oil 
cup  with  platinum  outlet  tube,  surrounded  by  brass  water  bath.  Complete  with  two  stand- 
ard thermometers  10°  to  50"C.  and  10°  to  150°  C.,  flask  graduated  at  200  ec,  and  tripod  with 
ring  burner 75.00 

9758.  YISCOSIMETER,  Engler,  Modified  by  TJbbelohde,  with  double  walled  lid.  oil  bath  totally  im- 
mersed, stirring  arrangement  and  a  device  for  controlling  the  size  of  the  outlet  opening. 
Complete  with  two  standard  thermometers  10°  to  50"C.  and  10°  to  150°C.,  200  ec  flask  with 
two  marks  and  tripod  with  ring  burner 90.00 


380 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


9760. 


12954. 

9761. 

9762. 


9766. 


9767. 


No.  9760. 


No.  9766. 


VISCOSIMETERS,  Saybolt  Universal,  improved  model  adapted  for  steam,  gas,  or  electric  heat- 
ing. For  testing  cylinder,  valve  and  similar  oils,  with  bath  at  212°F.,  and  oil  at  210°F; 
reduced  black  oils  with  bath  and  oil  at  130°F. ;  and  neutral  spindle,  parafnne,  red  and  other 
distilled  oils,  with  bath  and  oil  at  100°F.,  or  at  any  temperature  from  70°  to  212°  F.  Com- 
plete with  605-watt  electric  immersion  heating  device,  U  tube  steam  heater,  gas  burner,  turn- 
table stirring  arrangement,  six  thermometers,  graduated  flask,  and  with  connecting  cord  and 
attachment  plug,  as  illustrated,  without  stop  watch. 

No A  B 

For  volts   110  220 

Each    ,      $75.00       75.00 

STOP  WATCH  for  No.  9760 11.00 

FLASK  for  No.  9760,  graduated  at  60  cc 2.50 

THERMOMETERS  for  No.  9760,  solid  stem,  engraved  scale. 

No A  B  C 

Bange,  degrees  F 70  to  110   100  to  140  180  to  220 

Each  3.60      3.60      3.60 

VTSCOSIMETER,  Scott,  for  thin  or  viscous  liquids.  Each  instrument  is  standardized  and  has 
stamped  upon  the  handle  the  time  in  ceconds  and  fractions  for  50  cc  of  distilled  water  at 
70°F.,  to  be  discharged.  Complete  with  r.ccurato  -thermometer  graduated  to  212°F.  in  single 
degrees,  50  cc  graduated  cylinder,  and  with  instructions  for  use,  but  without  burner. .  20.00 
THERMOMETER  for  No.  9766,  graduated  from  50°  to  120°F.,  in  %°  divisions,  for  use  with 
lubricating  oils 8.25 


No.  9774. 


No.  9780. 

WANTAGE  RODS  FOR  OIL  BARRELS 

9774.  WANTAGE  ROD,  Four  Line,  of  seasoned  boxwood,  for  determining  the  quantity  of  liquid 
which  a  barrel  lacks  of  being  completely  filled.  With  scales  for  four  different  sized  barrels, 
two  for  half  barrels  and  two  for  full  barrels  1.65 

9776.     WANTAGE  ROD,  of  seasoned  boxwood,  for  use  in  55-gallon  steel  barrels 1.32 

9780.  WATER  INDICATOR  and  Oil  Sampler,  combined,  for  accurately  measuring  the  depth  of  water 

in  the  bottom  of  a  tank,  and  at  the  same    time    obtaining    a    sample.      Length    of    tube,    12 
inches.     Complete  with  50  strips  of  indicating  paper    9.90 

9781.  WATER  INDICATING  PAPER,  in  12-inch  strips,  for  use  with  No.  9780.  .  .per  100  strips      1.50 
OINTMENT  JARS,  see  Jars. 

OSMOSIS  APPARATUS,  see  general  heading  Physical  Chemistry  Apparatus. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


381 


9800. 
9801. 


9804. 
9805. 

9808. 


Nos.  9800-1. 


No.  9808. 


OVENS,  ELECTRIC  BAKING 


OVENS.  Baking,  Despatch  Electric,  large  size,  specially  designed  for  testing  in  flour  mill  and 
baking  laboratories  where  accurate  and  uniform  baking  is  desired,  but  useful  for  any  purpose 
requiring  temperatures  up  to  500°F.  or  260°C.  They  are  made  of  polished  steel  with  angle 
iron  corner  construction;  have  two-inch  solid  heat-retaining  walls  of  asbestos  throughout,  two 
doors  with  double  glass  observation  windows,  two  ventilators  in  top  and  bottom;  and  are 
equipped  with  Despatch  Open  Wire  Electric  Heaters,  wound  with  a  special  alloy  wire  which 
does  not  oxidize  nor  become  brittle.  These  ovens  have  vitrified  tile  inner  top  and  hard 
asbestos  floor  plates.  All  corner  work,  legs  and  trimmings  are  highly  polished  and  nickel- 
plated.  The  ovens  require  about  1%  hours  to  heat  to  500°F.,  then  the  current  should  be 
shut  off  and  baking  accomplished  without  further  use  of  current,  except  in  regulating  and 
holding  the  heat  at  certain  temperatures  as  desired.  They  are  practically  cool  outside  when 
in  use  and  there  is  absolutely  no  danger  of  fire.  All  sizes  are  22  inches  deep  and  27  inches 
high  outside,  and  have  a  baking  space  18  inches  deep  and  11  inches  high. 

No 100  125  135 

Length   outside,    inches 44  60  72 

Baking  space  length,   inches 40  56  68 

Size  of  doors,  inches 11x14  11x16  11x20 

Regulating    switches 2  3  4 

Max.   current    consumption,    watts 2600  3800          4700 

For  110  volts. . .  .' $160.00       185.00       250.00 

For  220  volts 160.00       185.00       250.00 

OVENS,  Baking,  Despatch  Electric,  of  same  construction  as  No.  9800,  but  smaller,  with  one 
door.  The  door  is  fitted  with  double  plate  glass  observation  windows.  A  three  heat  switch 
system  gives  the  operator  control  by  means  of  which  the  heat  can  be  held  at  any  desired 
temperature  indefinitely,  with  a  very  low  current  consumption.  The  tile  top  with  which  the 
baking  space  in  these  ovens  is  made  contributes  not  only  to  low  current  consumption,  but 
supplies  the  place  of  a  top  heater  and  tends  to  uniformity  of  heat  throughout  the  baking 
space. 

No 400 

Outside  dimensions,  inches 18x20x22 

Baking  space,  inches 14x9x18 

Size  of  doors,  inches 9x12 

Removable  shelves    1 


Current  consumption,  watts 500  to  1400 


402 

24x19x22 

20x10x18 

10x12 

2 
600  to  1800 


For  110  volts. 
For  220  volts. 


100.00 
100.00 


110.00 
110.00 


OVENS,  Baking,  Despatch  Electric  No.  90,  designed  to  meet  the  requirements  of  the  small 
laboratory  for  test  baking.  This  oven  is  intended  for  use  in  connection  with  Proofing 
Cabinet  No.  5982,  but  may  be  used  for  any  purpose  requiring  an  electrically  heated  oven 
capable  of  furnishing  a  temperature  up  to  500°F.  Constructed  of  polished  steel  with  double 
walls  packed  with  mineral  wool,  top  and  bottom  heaters  arranged  for  three  heats,  and  glass 
observation  door.  Depth  of  heating  space,  12  inches;  length,  20  inches;  height,  11  inches; 
current  consumption  on  high  heat,  1000  watts;  on  medium  heat,  500  watts;  on  low  heat,  250 
watts.  Capacity,  4  loaves. 

No A  B 

For   volts 110  220 

Each    .  60.00         60.00 


382 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  9812. 


No.  9814. 


No.  9816. 


9812.  OVENS,  Baking,  Hughes  Electric.  The  walls  and  the  doors  have  an  insulation  2  inches  thick, 
and  the  construction  of  the  door  makes  it  practically  heat  tight.  The  oven  is  provided 
with  a  three  point  switch,  giving  a  current  consumption  of  165,  330  and  660  watts.  A  tem- 
perature of  450°F.  is  reached  in  20  minutes,  and  a  maximum  temperature  of  600°F.  may 
be  attained,  which  may  then  be  maintained  indefinitely  with  the  switch  at  low  heat.  Inside 
dimensions,  11x11x9  inches.  Shipping  weight,  55  pounds.  Complete  with  temperature  indi- 
cator, attachment  plug  and  cord. 

No A  B 

For   volts 110  220 

Each $16.00       16.00 

9814.  OVENS,  Baking,  Hughes  Electric,  with  temperature  control.  This  oven  is  the  same  as  No. 
9812  except  that  it  has  no  three  point  switch,  but  is  provided  with  a  mercury  thermostat 
which  may  be  set  at  any  temperature  from  room  temperature  up  to  600°F.  Complete  with 
temperature  indicator,  attachment  plug  and  cord,  thermostat,  pilot  light  and  tubulature  for 
thermometer,  but  without  thermometer. 

No A  B 

For   volts 110  220 

Each    32.50         32.50 

9816.  OVENS,  Baking,  Hughes  Electric,  similar  to  No.  9812,  but  of  better  construction,  with  nickel- 
plated  legs  and  trim,  and  with  the  face  of  the  door  finished  in  white  enamel.  The  oven  has 
two  heating  units,  one  each  at  top  and  bottom,  controlled  by  separate  switches,  giving  9 
degrees  of  heat.  Each  burner  consumes  220,  440,  and  880  watts  at  low,  medium  and  high 
heats.  A  maximum  temperature  of  600°F.  may  be  obtained,  of  which  450°F.  is  reached  in 
15  minutes,  and  the  oven  is  so  well  insulated  that  it  has  been  found  on  a  pyrometer  test 
that  a  baking  temperature  will  be  maintained  for  an  hour  after  the  heat  has  been  completely 
turned  off.  Inside  dimensions,  18x12x12  inches.  Shipping  weight,  100  pounds.  Complete 
with  temperature  indicator,  attachment  plug  and  cord. 

No A  B 

For   volts HO  220 

Each    45.00         45.00 

9818.  OVENS,  Baking,  Hughes  Electric,  same  as  No.  9816  Oven,  but  with  inside  measurements  18xl6x 
12  inches.  Each  burner  consumes  275,  550  and  1,100  watts  at  low,  medium  and  high  heat 
respectively.  Shipping  weight,  125  pounds. 

No A  B 

For  volts HO  220 

Each       48.25        48.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


383 


Nos.  9830-1  (Patented). 


DeKhotinsky  Bimetallic  Thermo- 

Regulator. 
(Patent  applied  for.) 


OVENS,  DRYING,  ELECTRICALLY  HEATED  AND  REGULATED 

OVENS,  Drying,  Triple  Wall,  DeKhotinsky,  Electrically  Heated  and  Regulated  (Patented),  with 
new  bimetallic  regulator  and  new  system  of  ventilation  providing  for  greatest  possible  uni- 
formity of  temperature  throughout  the  oven  chamber. 

Construction:  These  ovens  are  constructed  of  asbestos  board  on  a  steel  frame,  with  three 
walls.  The  space  between  the  outer  v.-alls  is  packed  with  magnesia-asbestos  (magnesia  85 
per  cent.;  asbestos  15  per  cent.)  Between  the  inner  walls  is  an  air  space  through  which 
the  air  passes  upward  from  the  heating  units  in  the  base.  Ports  are  provided  in  the  side 
walls  of  this  air  space,  permitting  the  entrance  of  the  heated  air  to  the  oven  chamber,  in 
which  it  passes  up  and  out  through  an  opening  in  the  false  top.  The  location  of  these 
ports  has  been  carefully  and  scientifically  determined  so  as  to  provide  a  continuous  current  of 
heated  air  to  every  corner  of  the  inner  chamber,  making  the  temperature  uniform  through- 
out. This  feature  (patent  pending)  is  peculiar  to  the  DeKhotinsky  Triple  Wall  Oven,  and 
insures  a  uniformity  not  possible  in  electrically  heated  ovens  of  any  other  type.  The  outer 
door  is  double  walled  and  packed  with  magnesia-asbestos.  It  is  beveled  on  the  edges,  mak- 
ing close  contact,  when  closed,  with  the  walls,  thus  preventing  leakage  of  heat.  An  inner 
glass  door  is  provided  for  inspection  of  the  interior  without  cooling  the  contents.  Between  it 
and  the  outer  door  is  a  dead  air  space  for  insulation  purposes. 

Heating  of  the  oven  is  effected  by  means  of  four  of  our  standard  heating  units  of  chromel 
wire  wound  on  lavite.  These  heating  units  are  located  in  the  base  of  the  oven  between  the 
two  bottoms  with  an  iron  deflector  placed  over  them  to  prevent  radiation  of  heat  from  the 
units  into  the  inner  chamber.  Three  of  these  heating  units  are  connected  in  parallel  to  the 
switch  contact  springs,  and  may  be  added  to  the  circuit  one  at  a  time  as  desired.  The  fourth 
is  connected  in  circuit  with  the  contact  points  of  the  thermo-regulator.  These  heating  units 
can  be  easily  and  quickly  replaced  from  outside  the  oven  without  the  necessity  of  opening 
the  door  or  stopping  the  operation. 

Temperature  control  of  the  oven  is  secured  by  means  of  our  new  bimetallic  thermo-regulator 
which  is  made  from  invar-brass  ribbon,  and  can  be  set  at  any  desired  temperature  from  that 
of  the  surrounding  air  up  to  the  maximum  heat  capacity  of  the  oven.  This  range  of  tem- 
perature permits  the  use  of  these  instruments  as  ovens,  parafflne  baths,  or  sterilizers.  The 
precision  of  action  of  this  thermo-regulator  is  14°  C.  The  make-and-break  contact  of  the 
thermo-regtflator  is  located  outside  the  oven  to  prevent  the  possibility  of  ignition  of  inflam- 
mable gases  developed  in  the  inner  chamber,  which  often  occurs  when  the  contact  is  made 
and  broken  inside.  A  pilot  lamp  on  top  of  the  oven  is  connected  in  series  with  the  thermo- 
regulator,  enabling  the  operator  to  determine  at  a  glance  whether  the  oven  is  regulating. 
These  instruments  can  be  operated  on  either  A.C.  or  D.C.  circuits. 

No A  B  C 

Height  inside,  inches 10%          14%         19% 

Width  inside,   inches 7  12  17 

Depth  inside,  inches 6%  11%  14 

Shelf  space,  square  inches 91  282  476 

9830.  For  110  volts $55.00         90.00       145.00 

9831.  Por  220  volts 57.50         92.50       147.50 


384 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


9834. 
9835. 
9836. 
9837. 


Nos.  9846-7  (Patented). 

OVENS,  Drying,  Triple  Wall,  DeKhotinsky,  Electrically  Heated  and  Regulated,  same  as  No. 
9830,  but  provided  with  our  standard  DeKhotinsky  mercury  thermo-regulator  sensitive  to 
i/iQ0C.,  and  our  sensitive  iron  clad  relay,  for  controlling  the  temperature.  We  recommend  this 
equipment  for  research  work  requiring  close  temperature  regulation  where  careful  attention 
can  be  given  to  the  care  of  the  regulator,  as  its  supersensitiveness  to  temperature  changes 
renders  it  less  suitable  for  routine  work  than  the  bimetallic  regulator  supplied  with  Nos. 
9830-1. 

No A  B  C 

For  110  volts  A.C $67.50       102.50       157.50 

For  220  volts  A.C 70.00       105.00       160.00 

For  110  volts  D.C 65.00       100.00       155.00 

For  220  volts  D.C 67.50       102.50       157.50 


EXTRA  HEATING  UNITS  for  Nos.  9830  to  9837. 

No 

For  oven  No 

Wattage   

7526.  For  110  volts 

7527.  For  220  volts 

9838. 


B 
A 

60 
1.00 
1.25 


D 
B 

115 
1.00 
1.25 


E 

C 

140 
1.00 
1.25 


FUSES  for  Nos.  9830  to  9837,  enclosed  cartridge  type,  250  volts. 

For   size ." A-B  C 

Amperes   6  10 

Each   15  .15 

Note: — We  shall  be  glad  to  quote  prices  on  request  upon  our  DeKhotinsky  Electrically  Heated 
and  Regulated  Drying  Ovens  for  temperatures  higher  than  180°C.  Kindly  specify  both 
maximum  and  minimum  temperatures  at  which  they  are  to  be  used. 

OVENS,  Drying,  Single  Wall,  DeKhotinsky,  Electrically  Heated  and  Regulated  (Patented), 
with  new  bimetallic  regulator  and  new  system  of  ventilation  providing  for  greatest  possible 
uniformity  of  temperature  throughout  the  oven  chamber  obtainable  in  a  single  walled  drying 
oven.  For  work  requiring  the  greatest  precision  of  regulation  and  uniformity  of  temperature, 
we  recommend  our  DeKhotinsky  Triple  Wall  Drying  Oven.  (See  description  under  No.  9830.) 

Construction:  The  oven  is  built  of  J/i-inch  asbestos  board  on  a  steel  frame  with  a  foundation 
of  %-inch  asbestos  board.  To  effect  the  greatest  uniformity  of  temperature  possible  in  an 
oven  of  the  single  walled  type,  the  heating  units  are  placed  between  two  bottoms,  the  upper 
bottom  being  protected  from  the  direct  heat  of  the  units  by  an  iron  deflector.  Air  heated 
by  the  units  passes  back  between  the  bottoms,  up  through  the  space  between  the  double  back 
to  the  upper  part  of  the  oven,  and  after  circulating  through  the  oven  chamber  returns  to  the 
inter-bottom  space  by  way  of  an  opening  in  the  front  part  of  the  false  bottom.  This  feature 
(patent  pending)  is  peculiar  to  the  DeKhotinsky  Single  Wall  Drying  Oven  and  insures  a  uni- 
formity not  possible  in  other  types.  Two  shelves  of  the  grid  type  are  provided,  which,  by 
means  of  racks,  may  be  set  at  any  desired  height.  The  oven  is  mounted  on  a  japanned  steel 
base. 

Heating  of  the  oven  is  effected  by  means  of  six  of  our  standard  heating  units  of  115  watts 
each,  two  of  which  are  permanently  connected  to  the  connecting  receptacle  of  the  oven, 
three  to  the  switch  contact  springs,  and  the  remaining  one — the  heat-regulating  unit — is  in  cir- 
cuit with  our  bimetallic  thermo-regulator  for  automatic  control  of  the  desired  temperature. 
The  system  is  fused  for  protection. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


385 


9846. 
9847. 


9848. 
9849. 


9850. 


Nos.  9848-9  (Patented). 

OVENS,  Drying,  Single  Wall,  DeKhotinskyT  Continued. 
Temperature  Control:     Our  new  bimetallic  thermo-regulator   is   made   from   invar-brass   ribbon, 
and  can  be  set  at  any  desired  temperature  from  that  of  the  surrounding  atmosphere  to   the 
maximum  heat  capacity  of  the  oven,  about  140°C.     The  precision  of  action  of  this  thermo- 
regulator  is  *4  °C.     The  make-and-break  contact  of  the  thermo-regulator  is  located  outside  the 
oven  to  prevent  the  possibility  of  ignition  of  inflammable  gases  developed  in  drying,  which 
often  occurs  when  the  contact  is  made  and  broken  inside  the  oven.     A  pilot  lamp  on  top 
of  the  oven  is  connected  in  series  with  the  thermo-regulator,  enabling  the  operator  to  deter- 
mine at  a  glance  whether  the  oven  is  regulating. 
These  ovens  can  be  operated  on  either  A.C.  or  D.C.  circuits. 

DRYING  OVENS,  Single  Wall,  DeKhotinsky,  Electrically  Heated  and  Regulated,  as  described 
above,  complete  with  two  extra  cartridge  fuses,  Hubbell  receptacle,  and  5  feet  of  flexible 
asbestos  covered  cord  with  separable  Hubbell  attachment  plug. 

Width,  Depth,  Height,         Vol.  Inside,      Shelf  Space,         Voltage, 

nches  Inches  Inches  Cu.  Inches        Sq.  Inches        A.C.  &  D.C.  Price 

11  10  12  1320  220  110  $40.00 

11  10  12  1320  220  220  42.50 

DRYING  OVENS,  Single  Wall,  DeKhotinsky,  Electrically  Heated  and  Regulated,  of  same 
construction  as  Xo.  9846,  but  larger,  with  two  doors  and  with  eight  115-watt  heating  units. 
With  same  equipment  as  No.  9846. 

Vol.  Inside,     Shelf  Space,        Voltage, 
Cu.  Inches        Sq.  Inches       A.C.  &  D.C. 
3024  430  110 

3024  430  220 

No.        7526D 
110 


Width,  Depth  Height, 

Inches  Inches  Inches 

18  12  14 

18  12  14 

EXTRA  HEATING  UNITS  for  Xos.  9846  to  9849,  115  watt  capacity. 
For  volts  . 


Price 
60.00 
62.50 
7527D 
220 
1.25 
B 
15 
.15 


Each   1.00 

FUSES,  for  Nos.  9846  to  9849,  enclosed  cartridge  type,  250  volts.     No A 

Amperes 10 

Each   15 

OVENS,  Drying,  Despatch  Electric,  especially  designed  for  moisture  determinations  in  soils, 
flour,  etc.  They  are  practically  uniform  in  temperature,  having  a  three-point  regulating 
switch,  whereby  the  temperature  can  be  held  at  212°F.  Provided  with  top  and  bottom 
ventilators,  which  greatly  expedite  the  drying  process.  Made  of  polished  steel  with  angle 
iron  corner  construction,  and  with  all  fittings  nickel-plated,  with  1-inch  solid  heat  retaining 
walls  of  asbestos,  and  Despatch  Open  Wire  Electric  Heaters,  wound  with  special  alloy  which 
will  not  oxidize  nor  become  brittle.  Complete  with  four  removable  screen  shelves  and  tested 

thermometer.     No A 

Outside  dimensions,  inches 14x14x18 

Inside  dimensions,  inches 11x6x16 


9860. 
9861. 


Size  of  door,  inches. 

Number  of  shelves 

Current  consumption  first  heating,  watts. 
Current  consumption  continuous,  watts. . 

For  110  volts 

For  220  volts 


6x11 

2 

200 

100 

75.00 

75.00 


B 

C 

14x16x18 

16x20x20 

12x9x16 

13x12x18 

9x11 

12x13 

3 

4 

200 

250 

100 

150 

80.00 

85.00 

80.00 

85.00 

386 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  9870. 


Nos.  9880  &  9884. 


OVENS,   Drying,  Despatch  Electric,   similar  to  No.  9860,  but  with  two  compartments,  either  of 
which  may  be  used  separately  if   desired,  since  they  are  non-interfering.     Drying  space   of 
,each  compartment:   20  inches  wide,   16  inches  high,  and  18  inches  deep;  size  of  doors,  16x20 
inches;  maximum  power  consumption  of  each  compartment,  150  watts. 

No.   A  B 

Outside  dimensions,  inches 50x24x22     72x24x22 

Number  of  compartments 2  3 

9864.  For  110  volts $215.00          270.00 

9865.  For  220  volts 215.00  270.00 

9868.     OVENS,  Drying,   Despatch  Electric,   similar  to  No.  9860,  but  with  three  compartments.    Widelj 

used  for  sulphite  tests  in  pulp  mills.     Outside  dimensions,  60x21x24  inches  deep;  inside  dimen- 
sions of  each  chamber,  14x9x20  inches;  power  consumption  of  each  compartment,   100  watts. 

No A  B 

Tor  volts 110  220 

Each   280.00      280.00 

9870.  OVENS,  Drying,  Despatch  Electric,  for  moisture  determinations  in  soil,  flour,  etc.  Of  special 
value  in  milling  laboratories  for  Pekar  slick  tests.  Similar  in  construction  to  that  of  No. 
9860,  but  with  observation  window  in  the  door  so  that  tests  can  be  watched  without  opening 
oven.  Being  small  and  compact  this  oven  can  be  easily  moved  and  can  be  operated  any- 
where. Connection  can  be  made  with  ordinary  lamp  socket.  Outside  dimensions:  18  inches 
wide,  14  inches  high,  10  inches  deep;  drying  space,  16  inches  wide,  7  inches  high,  8  inches 
deep;  with  three  heats,  consuming  75,  150  and  300  watts  respectively. 

No -. A  B 

For  volts 110  220 

Each    45.00        45.00 

OVENS,  DRYING,  FOR  GAS  OR  OIL  HEAT 

9880.  OVENS,  Drying,  Single  Wall,  of  heavy  polished  copper  with  tubulations  for  thermometer  and  gas 
regulator,  mounted  on  heavy  east  iron  support  with  false  bottom  of  sheet  iron  to  protect  the 
copper.  With  two  removable  perforated  shelves. 

No A  B  C  D  E 

Outside  dimensions,  inches 6x8x6      8x10x8      10x12x10      18x24x18      18x36x18 

Each 8.00        10.00          14.00  44.00  65.00 

9882      OVENS,  Drying,  Single  Wall,  same  as  No.  9880,  but  with  enclosed  sheet  iron  base. 

No A  B  C  D  E 

Outside    dimensions,    inches 6x8x6  8x10x8       10x12x10     18x24x18     18x36x18 

Each    9.00  11.50  16.00  47.50  70.00 

9884.  OVENS,  Drying,  Double  Wall,  same  as  No.  9880,  but  with  water  jacket,  with  tubulations  for  ther- 
mometer and  gas  regulator.  With  two  shtlves. 

No ....    A  B  C 

Outside  dimensions,  inches 6x8x6  8x10x8  10x12x10 

Inside  dimensions,  inches 414x6^x5%          *%»*%x7%          8*4x1014x9% 

Each  10.00  14.00  22.00 

No D  E 

Outside  dimensions,  inches 18x24x18  18x36x18 

Inside  dimensions,  inches 16%x22y4xl7M  16V4x34 

Each  60.00  90.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


387 


No.  9894. 


No.  9896. 


9887. 
0888. 
9S90. 


9S92. 


9S94. 
9S96. 


OVENS,  Drying,  Double  Wall,  same  as  No.  9884,  but  with  enclosed  sheet  iron  base. 

No A  B  C  D  E 

Outside    dimensions,    inches 6x8x6          8x10x8       10x12x10     18x24x18     18x36x18 

Each    811.00  15.50  24.00  63.50  95.00 

WATER  GAGE,  fitted  to  any  Double  Wall  Drying  Oven  Nos.  9884-6 add     2.00 

WATER  LEVEL,  Kekule,  fitted  to  any  Double  Wall  Drying  Oven  Nos.  9884-6 ! ......     add     s!oO 

OVEN,  Drying,  Double  Wall,  for  high  temperatures,  similar  to  No.  9884,  but  of  extra  heavy 
copper  -with  all  seams  brazed.  May  be  used  with  oils  or  glycerine  to  furnish  temperature's 
up  to  300°C.  Height  inside,  8  inches;  width  inside,  10  inches;  depth  inside,  9  inches.  With 
heavy  cast  iron  support  stand 55.00 

OVEN.  Drying.  Double  Wall,  for  moisture  in  coal,  according  to  designs  of  the  United  States 
Bureau  of  Mines.  Made  of  copper  double  walled,  with  space  for  a  solution  of  glycerine  in 
water  of  specific  gravity  1.19  at  15°C..  which  will  maintain  a  temperature  of  105°C.  in  the 
oven  space.  The  door  is  double  walled  with  air  space  for  insulation.  To  hasten  drying,  a 
current  of  air,  dried  by  passing  through  concentrated  sulphuric  acid,  and  preheated  by  passing 
through  a  copper  tube  encircling  the  inner  chamber  between  the  walls,  is  forced  over  the 
samples  and  allowed  to  escape  through  a  small  opening  in  the  door.  With  removable  shelf 
perforated  to  take  No.  3166  Porcelain  Capsule,  openings  for  thermometer  and  gas  regulator, 
mounted  as  shown.  (See  Technical  Paper  No.  8  of  the  United  States  Bureau  of  Mines  page 
40.00 

CONDENSER.  Soxnlet,  for  use  with  Oven  No.  9S92,  see  Condensers. 

OVEN,  Drying,  Single  Wall,  of  copper  covered  throughout  with  asbestos,  as  used  in  tar  and 
pitch  testing.  Size,  8x10x8  inches 19.00 

OVEN.  Drying,  Single  Wall,  with  three  compartments.  Made  of  heavy  polished  copper,  21 
inches  long,  8%  inches  high.  7  inches  deep;  with  three  chambers,  each  7  inches  deep  and  7 
inches  wide:  with  separate  doors,  ventilators,  and  two  tubulatures  for  each  chamber.  Pro- 
vided with  sheet  iron  back  and  support,  arranged  for  table  or  wall 33.00 


388 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


9900. 


9904. 


9922. 


9924. 


NO,  9900. 


No.  9922. 


No.  9924. 


OVEN,  Drying,  Single  Wall,  Asbestos,  of  the  type  used  in  the  United  States  Bureau  of  Soils. 
Substantially  made  of  heavy  asbestos  board,  13  inches  deep,  18  inches  wide,  and  48  inches 
high.  Openings  are  provided  at  the  top  for  thermometer  and  gas  regulator  and  near  the  bot- 
tom for  gas  inlet  tube.  Very  satisfactory  for  drying  largo  quantities  of  soil  samples.  Com- 
plete with  5  removable  shelves  of  woven  wire  $65.00 

OVENS,  Drying,  for  Asphalt  Testing,  see  Nos.  360  and  361. 

OVEN,  Drying,  Double  Wall,  Dr.  Blair's,  as  used  in  iron  ore  analysis.  Of  heavy  sheet  cop- 
per, double  walled,  with  tabulations  and  constant  water  level.  Provided  with  four  compart- 
ments, 4%x6x2%  inches,  and  with  4  numbered  copper  boxes,  4x4%xl1/£  inches,  to  fit  in  same. 
Dimensions  over  all:  length,  24  inches;  height  without  support,  7  inches;  total  height,  19 
inches;  depth,  7  inches.  Mounted  on  sheet  iron  base  with  legs 44.00 

OVEN,  Alsop's  Steam  Drying,  see  Nos.  14290-1. 

OVEN,  Vacuum  Drying,  Double  Wall,  for  steam  or  gas  heating.  Used  extensively  by  the  United 
States  Department  of  Agriculture,  sugar  laboratories,  etc.  Made  of  heavy  drawn  brass  tub- 
ing tinned  inside,  with  outer  jacket  separated  by  1  inch  of  steam  space.  The  heavy  hinged 
door  is  ground  to  fit  the  flange  of  the  oven  and  provided  with  six  thumb  screws.  Diameter 
inside,  8  inches;  depth,  16  inches.  Complete  with  soft  rubber  gasket  for  door,  two  perfor- 
ated shelves,  two  %-inch  perforated  pipes  for  introducing  moisture,  two  perforated  pipe 
burners  for  gas,  a  constant  level  arrangement  for  water  with  shut-off  cock,  a  nipple  con- 
nection for  steam,  a  draw-off  cock  for  condensed  steam,  openings  for  thermometer  and  for 
withdrawing  air,  and  with  vacuum  gage,  mounted  on  angle  iron  frame  incased  in  sheet 
iron  250.00 

OVEN,  Vacuum  Drying,  Double  Wall,  used  also  for  drying  in  a  current  of  hydrogen,  etc.  Made 
of  heavy  copper,  with  flanged  door  held  by  six  thumb  screws  and  sealed  with  rubber  gaskets. 
Can  be  used  with  glycerine,  toluol,  or  water  in  the  jacket  and  for  vacuum  up  to  20  inches.  Out- 
side dimensions,  18x10  inches.  Diameter -inside,  6%  inches;  depth,  17  inches.  With  one  shelf 
and  with  openings  for  vacuum  connections,  gage  and  thermometer,  but  without  gage  or 
thermometer  66.00 

Note: — We  shall  be  pleased  to  co-operate  with  our  customers  in  the  design  and  manufacture  of 
constant  temperature  ovens  for  special  purposes  as  we  maintain  a  department  which  is  de- 
voted entirely  to  the  development  of  constant  temperature  appliances. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


<589 


9946.  OZONATOR,  Electric,  for  the  pro- 
duction of  ozone  (Os)  for  labora- 
tory and  industrial  research.  This 
outfit  is  a  practical  working  ma- 
chine built  for  us  by  the  Electric 
Ozone  Sterilizer  Co.  of  America. 
The  ozone  producing  tubes  are  the 
same  as  those  used  on  the  large 
industrial  outfits  and  all  parts  are 
standard.  The  machine  is  a  com- 
bination of  the  suction  and  pres- 
sure types.  For  suction  an  as- 
pirator is  furnished  and  a  tower 
is  provided  for  use  whenever  the 
pressure  type  is  needed.  The  ma- 
chine consists  essentially  of  a  110 
to  5500  volts  step-up  transformer, 
two  standard  vacuum  ozone  produc- 
ing tubes,  a  pressure  tank,  a  mixer 
with  aspirator,  an  absorption 
tower,  and  a  rheostat  for  control- 
ling the  voltage.  The  concentra- 
tion of  ozone  can  be  controlled 
either  by  changing  the  rate  of 
flow  of  air  or  by  varying  the  volt- 
age. The  various  parts  are 
mounted  on  a  white  enameled 
board  22x32  inches  with  all  con- 
nections in  plain  sight.  The  line 
wiring  is  enclosed  in  aluminum 
tubing,  and  the  high  voltage  wir- 
ing in  glass  tubing,  to  prevent  any 
danger.  The  tower  is  five  feet 
high. 


No.  9946. 


With  this  outfit  and  a  small  force  or  suction  pump  such  as  our  No.  1398  or  No.  1400,  there  is 
available  for  the  research  engineer  or  chemist  an  ample  supply  of  ozone  in  any  concentration 
up  to  six  grams  per  cubic  meter  of  air,  and  in  quantity  up  to' one-half  gram  per  hour  per  tube. 
A  special  valve  is  provided  by  which  the  ozone  can  be  "obtained  from  either  one  or  both  of  the 
vacuum  ozone  tubes,  and  can  be  mixed  with  water,  either  by  a  suction  system  in  the  mixing 
valve  or  by  the  use  of  pressure  in  the  absorbing  tower,  or  can  be  led  or  forced  into  any  solution 
desired. 

Some  of  the  uses  to  which  this  machine  can  be  put,  on  a  laboratory  scale,  are:  the  practical 
sterilization  of  water;  the  sterilization  of  milk;  purification  of  air;  sterilization  of  bottles  and 
containers;  disinfection  of  surgical  dressings;  bleaching  and  refining  of  oils;  bleaching  of  flax, 
gums,  waxes,  ivory,  bone,  feathers  and  starch;  aging  wines  and  liquors;  hardening  and  ripening 
woods:  improving  the  quality  of  tobacco;  removing  undesirable  odors  from  raw  coffee;  the  puri- 
fication of  illuminating  gas;  and  in  cold  storage  experiments,  especially  in  keeping  eggs,  meat 
and  vegetables. 

By  means  of  this  machine,  all  of  the  above  processes  can  be  tested  on  a  sufficiently  large  scale  in 
the  laboratory  to  enable  satisfactory  conclusions  to  be  drawn  as  to  the  success  of  the  opera- 
tions when  conducted  on  a  practical  manufacturing  basis. 

Ozone  is  a  powerful  chemical  agent  for  use  in  organic  chemistry,  and  finds  further  application  in 
the  manufacture  of  artificial  gum  arabic;  the  production  of  synthetic  indigo;  the  oxidation  of 
turpentine  to  camphor;  the  production  of  artificial  perfumes:  the  manufacture  of  vanilla  ex- 
tract, etc..  Many  other  uses  will  be  readily  found  for  this  machine  in  the  researoli  labora- 
tories of  universities  and  industrial  plants. 

Complete  as  described  with  high  potential  transformer,  4  gallon  pressure  tank,  air  valve,  air 
pressure  gage,  two  %-inch  brass  cocks,  manually  operated  faucet  with  electric  switch  and  as- 
pirator, snap  switch,  two  vacuum  ozone  tubes  with  switches,  four-way  tube  with  four  valves, 
two  1  ampere  fuses  in  white  enameled  cast  iron  box,  all  mounted  on  white  enameled  board, 
and  with  ozone  tower,  rheostat  and  one  extra  ozone  tube,  complete  with  directions  for  installa- 
tion and  operation. 


Type 


For  volts 
Each    . 


C.  A.  C.  B. 

A.  C. 

110  220 

$375.00         375.00 


C.  C.          C.  D. 

B.C. 

110  220 

450.00         450.00 


390 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  9930. 


No.  9988. 


9930.  OVENS,  Despatch  Electric,  for  Temper  Drawing,  Enameling,  Core  Baking,  e'.c.,  built  of  galvan- 
ized iron  re-enforced  at  the  edges  with  angle  iron  and  finished  in  dull  black  enamel.  Equipped 
with  Open-Wire  Electric  Heaters  for  temperatures  up  to  700°F.  The  walls  are  double  packed 
with  three  inches  of  asbestos  for  insulation.  Provided  with  switches  to  control  temperature, 
and  with  ventilators  in  top  and  bottom.  Maximum  current  consumption,  3  kilowatts  per 
hour.  Outside  dimensions,  32x40x26  inches;  inside  dimensions,  24x24x18  inches;  weight 
crated,  400  pounds.  Complete  with  6  shelves  of  woven  wire,  re-enforced  to  prevent  sagging. 

No A  B 

For  volts HO  220 

Each    $145.00       145.00 

OVEN  THERMOMETERS,  see  general  heading  Thermometers. 
For  OZONATOR,  Electric,  see  page  389. 

9950.  OZONE  APPARATUS,  Siemens',  for  showing  the  formation  of  ozone  by  the  discharge  of  an  elec- 
tric current.  Complete  with  wooden  support  7.00 

9951.    OZONE  TUBE,  Siemens',  glass  tube  only  of  No.  9950,  without  foil 3.50 

9980.    PAILS,  White  Enameled,  Seamless,  with  cover   of   same,   for  laboratory   waste.      Capacity,   3 

gallons    each     2.60 

PALLADIUM  TUBE,  see  Gas  Analysis  Apparatus. 
PALM  GLASS,  see  Pulse  Glass. 
PANS,  Baking,  see  Plour  Testing  Apparatus. 
PANS,  Gluten  Washing,  sec  Flour  Testing  Apparatus. 
PANS,  Gold  Washing,  see  Nos.  7284  and  7286. 

9988.    PANTOGRAPH  for  enlarging  or  reducing  maps,  drawings,  etc.     Brass  mounted;  black  figures  on 
highly  polished  hardwood;  movable  point.   A  very  neat  and  substantial  instrument.   Furnished 

complete  with  pencil  holder,  but  without  drawing  board   1.50 

PAPER,  Adams,  for  Milk  Analysis,  see  No.  9266. 
PAPER,  Asbestos,  see  Asbestos  Paper. 

9992.    PAPER,  Blue  Print,  30  inches  wide,  in  10  yard  rolls Per  roll      1.00 

9994.     PAPER,  Blue  Print,  in  light-proof  packages  of  24  sheets. 

Size,  inches  4x5  5x7  5x8  8x10 

Per  package 20  .22  .25  .35 

9998.  PAPER,  Carborundum,  in  sheets  9x11  inches. 

No 000  00  0 

Per  sheet .05  .05  .05 

Per  quire 1.00  l.CO  1.00 


1 

.06 
1.25 

.06 
1.00 


10000.    PAPER,  Congo  Red,  in  sheets  11x17  inches Per  sheet 

PAPER,  Cross  Section,  see  Cross  Section  Paper.  Per  quire 

PAPER,  Drawing,  see  Drawing  Paper. 
PAPER,  Emery,  soe  Emery  Paper. 
PAPER,  Filter,  all  kinds,  see  Filter  Paper. 
10004.    PAPER,  Glazed,  for  collecting  filter  ashes,  etc.,  in  sheets  20x24  inches. 

No A  B  C 

Color , black  white  yellow 

Per  quire .60  .40  .60 

10008.    PAPER,  Litmus,  blue,  in  sheets  8x10  inches Per  sheet         .05 

Per  quire        .80 

10010.    PAPER,  Litmus,  blue,  in  books  of  50  strips Per  book  .06 

Per  dozen  books        .60 

10012.   PAPER,  Litmus,  blue,  in  glass  vials  containing  100  strips Per  vial  .10 

Per  dozen  vials      1.05 


CENTRAL  SCIE::TiriC  CO.,  CHICAGO,  U.  S.  A. 


No.  10076. 


No.  10080. 


10016.  PAPER,  Litmus,  neutral,  in  sheets  8x10  inches Per  sheet 

Per  quire 

10018.     PAPER.  Litmus,  neutral,  in  books  of  50  strips    Per  book 

Per  dozen 

10020.  PAPER,  Litmus,  neutral,  in  glass  vials  containing  100  strips Per  vial 

Per  dozen 

10024.    PAPER,  Litmus,  red,  in  sheets  8x10  inches Per  sheet 

Per  quire 

10026.    PAPER,  Litmus,  red,  in  books  of  50  strips Per  book 

Per  dozen  books 

10028.    PAPER,  Litmus,  red,  in  glass  vials  containing  100  strips Per  vial 

Per  dozen  vials 

10032.    PAPER,  Log-wood,  in  sheets  11x17  inches Per  sheet 

Per  quire 

10036.    PAPER,  Paraffin,  in  sheets  12x18  inches Per  quire 

10040.    PAPER,  Parchment,  vegetable,  in  sheets  18x24  inches Per  sb.3Ct 

Per  quira 

10042.    PAPER,  Parchment,  genuine  animal  product,  in  sheets  17x22  inches Per  sheet 

10046.    PAPER,  Sand,  in  sheets  9x11  inches. 

No 00  0  1  2 

Per  sheet 05  .05  .05  .03 

Per  quire 55  .55  .60  .70 

10050.   PAPER,  Turmeric,  in  sheets  11x17  inches Per  sheet 

Per  quire 

10052.    PAPER,  Turmeric,  in  books  of  50  strips Per  book 

Per  dozen  books 
10058.  PAPER.  Wrapping,  genuine  Kraft,  in  rolls. 

No A  B  C  D 

Width,  inches 9  15  24  30 

Weight,    pounds 14  20  29  32 

Per  roll 2.15  3.35  4.50  5.00 

10062.  PAPER  BAGS,  of  heavy  manila  paper  with  metal  clasp  which  cannot  become  unfastened, 
samples  of  ore,  grain,  etc. 


No A 

Size,  inches 4%x3 


Per  dozen 
Per  100 


10064.  PAPER  BAGS,  ordinary  quality  and  style,  as  used  for  sugar,  etc. 

Capacity,    pounds 1  2  3  5  8 

Per  dozen 05  .10  .10  .15  .16 

Per  100   35  .70  .70          1.05          1.15 

10068.  PAPER  RACKS,  with  cutter,  for  No.  10058;  to  be  screwed  to  table: 

For  No A  B 

Each    2.50          2.55 


.15 
.95 

10 

.18 

1.26 

C 
2.60 


B 

5^4x3% 

.20 
1.20 

16 

.24 

1.60 

D 

2.75 


$003 

1.00 
.06 
.60 
.10 

1.05 
.05 
.80 
.06 
.60 
.10 

1.05 
.06 

1.00 
.23 
.05 
.60 

1.70 

3 

.05 
.80 
.06 
1.00 
.06 
.60 

E 

36 

'  47 

7.50 

Foi 

C 
6x4 

.25 
1.40 


.27 
1.70 

E 
2.80 


10076.  PAPER  TESTER,  Mullen,  for  measuring  the  bursting  strength  of  paper,  cardboard,  textiles, 
etc.  By  turning  the  hand  wheel,  the  fluid  pressure  is  applied  upon  a  circular  area  of  1 
square  inch,  and  the  pressure  required  to  burst  the  paper  is  registered  upon  the  gage  in 
pounds  per  square  inch.  A  rubber  diaphragm  prevents  the  fluid  from  wetting  the  paper. 
This  test  is  required  upon  all  paper  purchased  by  the  United  States  Government 115.00 

10080  PAPER  THICKNESS  GAGE.  Micrometer  Caliper,  pocket  size,  reading  from  0  to  %  inch  in 
thousandths.  Very  convenient  for  carrying  in  the  pocket.  Length,  2  inches 7.75 


392 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  10100. 


No.  10108. 


10084.  PAPER  THICKNESS  GAGE,  standard,  for  use  with   any  paper  from  tissue  to   heaviest  card-, 
board.     Heads  thickness  direct  upon  dial  in  thousandths  of  an  inch,  up  to  0.3  inch,  without 
danger  of  error $35.00 

10086.  PAPER  THICKNESS  GAGE,  pocket  type,  in  leather  covered  case  which  fits  the  pocket.    Heads 

to  0.3  inch  in  thousandths 17.50 

For  other  PAPER  TESTERS,  sec  Testing  Machines. 

PARAFFINE  BATHS  AND  OVENS 

10100.  PARAFFINE  BATH,  simple  form,  made  of  polished  copper,  7  inches  long,  3%  inches  wide,  and 
3%  inches  deep,  with  extra  sheet  iron  bottom  and  iron  base  5  inches  high.  It  is  provided 
with  a  space  for  heating  slides,  and  two  nickel-plated  cups.  The  shallow  cup  is  2%  inches 
in  diameter  and  %  inch  deep,  watch  glass  shape,  and  the  deep  one  is  2%  inches  in  diameter 
and  1%  inches  deep.  With  tubulations  for  thermometer,  gas  regulator  and  for  three  test 
tubes.  Without  burner,  thermometer,  or  regulator  10.00 

10102.  PARAFFINE  BATH,  round  form,  of  polished  copper,  12%  inches  in  diameter,  3V£  inches  deep, 
with  sheet  iron  base,  7%  inches  high.  There  are  ten  cups,  seven  of  deep  form,  2%  inches 
in  diameter  and  1%  inches  deep,  and  three  shallow,  2%  inches  in  diameter  and  %  inch  deep, 
watch  glass  shape.  With  five  tubulations  in  the  top  for  glass  tubes,  and  tubulations  for  ther- 
mometer and  gas  regulator.  Without  burner,  thermometer,  or  regulator 23.00 

10106.  PARAFFINE  BATH,  Coplin,  of  copper,  with  four  cups,  3  inches  in  diameter  by  4  inches  deep, 
and  one  larger  central  reservoir  7  by  3  by  4  inches  deep  with  stop-cock  to  draw  off  melted 
paraffine.  With  three  spaces  in  front  for  heating  material  in  glass  vessels,  etc.,  valve  to 
draw  off  the  water,  a  cylindrical  shield  for  the  gas  flame;  and  with  tubulations  for  ther- 
mometer and  gas  regulator.  Outside  dimensions,  12x12x23  inches  high,  with  iron  stand  17 
inches  high  41.25 

10108.  PARAFFINE  BATH,  Lewis,  designed  for  use  with  either  gas  or  alcohol  lamp.  The  temperature 
of  the  bath  is  maintained  by  a  constant  convection  current,  which  enters  through  the  tube 
leading  from  the  heating  cylinder  into  the  side  of  the  bath  and  returns  from  the  bottom  of 
the  bath  back  to  the  heating  cylinder.  The  temperature  is  easily  regulated  by  means  of  the 
stop-cock  in  the  heating  tube.  This  permits  the  use  of  a  lower  or  higher  temperature  accord- 
ing to  the  melting  point  of  paraffine  used.  Made  of  polished  copper,  with  three  deep  cups, 
1%  inches  in  diameter  by  1%  inches  deep,  and  with  two  shallow  cups,  1%  inches  in  diameter 
by  %  inch  deep,  four  test  tube  or  vial  receptacles  and  one  opening  for  thermometer.  With- 
out burner,  thermometer,  or  regulator 19.80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


393 


No.  10114. 


No.  10116. 


No.  10122. 
Size  3F. 


10110.  PARAFFINE  BATH,  same  as  Xo.  10108,  but  larger  size,  with  five  deep  and  three  shallow 
cups $24.75 

10114.  PARAFFINE  BATH,  Miller,  of.  polished  copper,  8  inches  long,  4  inches  wide  and  4  inches  deep, 
provided  with  an  extra  sheet  iron  bottom  to  prevent  burning  out,  and  an  iron  base  5  inches 
high.  The  bath  has  two  nickel-plated  cups,  one  shallow  and  one  deep.  The  shallow  cup  is  2% 
inches  in  diameter  and  %  inch  deep,  watch  glass  shape,  and  the  deep  one  is  2%  inches  in 
diameter  and  1%  inches  deep.  Complete  with  two  drawers  to  hold  slides,  and  with  tabula- 
tions for  thermometer,  gas  regulator  and  for  five  test  tubes,  but  without  burner,  thermometer 
or  regulator 16.50 

10116.  PARAFFINE  BATH,  Naples,  of  polished  copper,  12  inches  long,  9  inches  wide  and  5  inches 
high,  with  sheet  iron  base  13  inches  high.  The  bath  is  provided  with  two  nickel-plated  cups, 
one  of  them  2%  inches  in  diameter  by  1%  inches  deep,  and  the  other  2%  inches  in  diameter 
by  %  inch  deep,  watch  glass  shape;  also  with  five  embedding  pans  with  supports  to  prevent 
overturning,  and  seven  tubes  for  vials,  1%  inches  deep,  two  %  inch,  two  %  inch  and  three 
1  inch  in  diameter.  Provided  with  tubulations  for  thermometer  and  gas  regulator.  The 
embedding  compartment  is  5  by  4  by  3  inches  deep;  under  it  is  a  drying  chamber  with  a 
drawer.  The  warming  table,  9  by  3  inches,  in  front  of  the  bath,  is  very  useful  for  keeping 
embedding  pans  warm,  etc.  Without  burner,  thermometer,  or  regulator 29.00 

PARAFFINE  EMBEDDING  OVENS,  simple  form,  see  Drying  Ovens  Nos.  9884-6. 

PAEAFFINE  EMBEDDING  OVENS,  DeKhotinsky  Electrically  Heated  and  Regulated,  see  In- 
cubators Nos.  7890  to  7900. 

PARAFFINS  EMBEDDING  OVENS,  Wood  Frame,  Electrically  Heated  and  Regulated,  of  same 
construction  as  No.  7908  Incubators,  but  with  thermostat  adjusted  and  tested  at  56°C.  before 
shipment.  For  full  description  see  No.  7908. 

No 2P  3P  IIP  31P  32P  41P 

Height  inside,  inches 26  12  15  30  26  30 

Width   inside,   inches 18  9  12  20  18  20 

Depth    inside,    inches 18  9  10%  18  18  18 

Number  of  shelves 1  1  1  3  1  3 

Doors     double       single       double      double      double     double 

Height   of  stand,  inches 32  32 

Shipping   weight,    pounds 145  22  38  175  180  220 


10122.  For  110  volts 79.00 

10123.  For  220  volts. .  .   79.00 


26.50         48.00         90.00         91.50       102.50 


2-5. 50 


48.00 


90.00 


91.50       102.50 


10124.  PARAFFTNE  RECEPTACLE  for  use  in  Nos.  10122  and  10123,  when,  used  as  Paraffine  Ovens. 
Constructed  of  steel  with  three-inch  legs  of  same  material.  Top  and  bottom  are  of  %6  inch 
transite;  the  5  shelves  are  of  perforated  metal,  each  shelf  having  9  holes  2%6  inches  in  diam- 
eter for  paraffine  cups.  Height,  13  inches;  width,  14  inches;  depth,  14  inches;  shipping 
weight,  30  pounds.  This  receptacle  can  be  purchased  separately  for  use  in  Paraffine  Ovens 
Nos.  2P.  31P,  32P  and  41P,  or  if  ordered  together,  the  receptacle  will  be  fitted  in  place.  Com- 
plete with  45  paraffine  cups.  (For  illustration,  see  page  394.) 50.00 


394 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  10126. 


Nos.  10130-3. 


10126.  PARAFFINE  EMBEDDING  OVEN  AND  INCUBATOR,  Combined,  consisting  of  No.   7908-33 
Incubator,  with  an  insulating  partition  dividing  the  inner  space  into  two  compartments  30 
inches  high,  17%  inches  wide,  and  18  inches  deep.    These  compartments  are  thoroughly  insu- 
lated from  each  other  so  that  one  may  be  used  for  incubation  at  37.5°C.,  the  other  for  paraf- 
flne  work  at  56°C.    They  are  provided  with  independent  heaters,  pilot  lamps,  and  thermostats, 
so  that  either  may  be  used  irrespective  of  the  other.     The  paraffine  compartment  is  supplied 
with  No.  10124  Parafflne  Receptacle,  affording  ample  capacity  in  small  space.     Complete   as 
described,  with  paraffine  receptacle,  45  paraffine  cups  to  fit  same,  and  thermometer  for  each 
compartment,  mounted  on  angle  iron  stand  32  inches  high  .........................   $275.00 

PARAFFINE  EMBEDDING  OVEN,  Lillie,  of  polished  copper,  with  three  walls,  covered  on  the 
outside  with  an  insulating  material.  Provided  with  numbered  drawers,  10  inches  long,  4 
inches  wide  and  S1^  inches  deep,  with  sides  and  back  of  perforated  zinc  to  allow  circulation 
of  heat  from  the  top  to  the  bottom  of  the  chamber.  The  fronts  of  the  drawers  are  of  cop- 
per, with  drop  handles.  With  water  gage,  stop-cock  and  tabulations  for  thermometer  and 
thermo-regulator,  with  enclosed  sheet  iron  base  10%  inches  high,  without  thermometer  or 
regulator. 

No  ..........................................  A 

Numbers   of   drawers  ..........................  g 

Dimensions  outside,  inches  ..................... 

10130.  Without  heater  ......................... 

10131.  With  gas  heater  ............................ 

10132.  With  oil  heater  .......................  ........ 

10133.  With  electric  heater  ......................  .  '  .  . 


B 

16 


94.00 
102.25 
175.00 
173.25 


133.75 
144.50 
204.60 
222.75 


C 
24 

20x28x15 
170.00 
181.00 
241.00 
255.00 


CEXTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


395 


Nos.  10136-9. 


No.  10170. 


No.  10174. 


PARAFPTNE  EMBEDDING  OVEN,  Lillie's  Improved,  similar  in  construction  to  No.  10130. 
but  provided  with  8  drawers  and  2  receptacles  with  screw  tops  and  stop-cocks  to  enable  the 
contents  to  be  run  into  molds  as  required;  with  12  perforated  trays  for  drying  and  fixing  pur- 
poses. Outside  dimensions,  23  inches  wide,  25  inches  high,  and  15^  inches  deep,  with  enclosed 
sheet  iron  base  15  inches  high. 

10136.  Without    heater $198.50 

10137.  With  gas  heater 209.20 

1    IS.          With  oil  heater 262.50 

10139.          With   electric  heater 288.75 

PARAPFINE  EMBEDDING  BOX,  see  No.  8934. 
PARAFFINE  EMBEDDING  TABLE,  see  No.  8936. 
PARR  CALORIMETER,  see  Calorimeters. 
PASTILLE  PRESS,  see  Xo.  2400. 

10156.    PENCIL,  Litmus,  made  like  an  ordinary  lead  pencil,  one  end  blue,  the  other  end  red 25 

10160.    PENCILS,  Wax,  for  writing  on  glass,  porcelain,  etc. 

No A  B  C 

Color blue  red  yellow 

Each 15  .15  .15 

10162.  PENCILS,  Wax  Crayons,  for  marking  on  glass,  porcelain,  alundum,  etc.     Need  no  sharpening  and 
the  marks  do  not  run  when  heated.     The  blue  burns  to  an  indelible  mark  on  porcelain. 

No A  B  C 

Color black          blue  red 

Each 06  .06  .06 

Per  dozen ." .         .60  .60  .60 

10164.    PENCIL  SHARPENER,  Boston.     Simple  and  durable;  for  standard  size  pencils.     Celluloid  box 

holds  dust  and  shavings.     Xew  cutters  readily  inserted 1.00 

10170.  PERCOLATORS,  conical,  heavy  glass. 

Capacity,    pints 1  2 

Each    .60  .70 

Capacitv,  gallons %  1  2 

Each   . ". 1.00          1.30          2.50 

10174.  PERCOLATORS,  Oldberg's,  heavy  glass,  narrow  form,  almost  cylindrical. 

Capacitv.  pints %  1  1%  2  2V, 

Each 60  .70  .85  1.05  1.20 

Capacity,    gallons %  1  2 

Each   .'. 1.45          2.35          4.50 

PERCOLATOR  BOTTLES  or  Jars,  see  Jars,  Percolating. 
PETRI  DISHES,  see  Culture  Dishes. 

PHOSPHORUS  TUBE.  Goetz's,  see  Centrifuges  and  Accessories. 
PHOTOMETERS,   see   Gas  Analysis  Apparatus. 
PHOTOMETERS,  Parr's  Sulphur,  see  No.  2378. 


396 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


No.  10210. 


No.  10234. 


Types  of  Washburn  Conductivity  Cells. 


PHYSICIAL  CHEMISTRY  APPARATUS 

BATTERY  CELLS,  all  kinds,  see  general  heading  Batteries. 
BRIDGE,  Conductivity,  see  No.  10436. 
CALORIMETERS,  see  general  heading  Calorimeters. 

10210.  CELL,  Conductivity,  Arrhenius,  for  poorly  conducting  liquids,  with  electrodes  of  platinum  24  mm 
in  diameter,  held  10  mm  apart.     Weight  of  platinum,  about  5.6  grams.     With  hard  rubber  cap 


$37.50 

10211.  GLASS  CELL  only  of  No.  10210 i 1.50 

10214.  CELL,  Conductivity,  Kohlrausch,  for  good  conductors,  consisting  of  two  cylinders  graduated  in 
%  cm  divisions  joined  together,  with  large  fused-in  platinum  electrodes  and  ground  glass 
stoppers.  Weight  of  platinum,  about  4.2  grams 29.00 

1 0218.  CELL,  Conductivity,  Kohlrauscll,  for  good  conductors,  with  the  two  arms  graduated  in  45  parts 

divided  into  l/5ths,  and  fitted  with  platinum  electrodes  set  in  silver  rods  with  conducting  plates. 
Electrodes  are  adjustable  vertically  through  hard  rubber  stoppers.  Weight  of  platinum,  about 
0.75  grams , 25.00 

10219.  GLASS  CELL  only  of  No.  10218,  graduated 6.00 

30226.  CELL,  Conductivity,  Kohlrausch,  for  poorly  conducting   liquids,   with   large,   securely    fused-in 

platinum  electrodes.  Weight  of  platinum,  about  4.2  grams.  With  ground  glass  stopper  and 
glass  cell  graduated  in  %  cm  divisions 25.00 

10230.  CELL,  Conductivity,  Kohlrausch-Holburn,  for  poorly  conducting  liquids,  with  vertical  electrodes 

supported  in  adjustable  rubber  cap  so  that  the  distance  apart  may  be  changed  as  desired. 
Weight  of  platinum,  about  4.2  grams i 37.50 

10231.  GLASS  CELL  only  of  No.  10230 1.50 

10234.  CELL,  Conductivity,  Ostwald,  for  poorly  conducting  liquids,  with  platinum  electrodes  15  mm  in 

diameter,  held  20  mm  apart.  Weight  of  platinum,  about  2.2  grams.  With  hard  rubber  cap 
30.00 

10235.  GLASS  CELL  only  of  No.  10234 1.50 

CELLS,  Conductivity,  Washburn.     These  cell^  are  described  in  detail  in  the  Journal  of  the  Ameri- 
can Chemical  Society,  Vol.  XXXVIII,  for  1916,  page  2449.     We  shall  be  glad  to  quote  prices 
upon  any  of  the  types  described,  and  to  furnish  them  upon  order.     They  are  not  carried  regu- 
larly in  stock. 

CELL,  Standard  or  Normal,  see  Batteries. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


397 


No.  10248. 


No.  10250. 


No.  10256. 


No.  10258.        No.  10260. 


No.  10264. 


10238.  SUPPORT  for  Conductivity  Cells,  consisting  of  heavy  non-corrosive  metal  base  and  rod,  with 
clamp  for  holding  cells,  hard  rubber  terminal  with  mercury  wells  and  binding  posts  and  with 
clamp  for  attachment  to  thermostat. 

No A  B  C  D  E  P 

For  Cell  No 10210   10214   10218   10226   10230   10234 

Each  $7.50    7.50    7.50    7.50    7.50   7.50 

10240.  COTJLOMETER,  Washburn's  Iodine,  as  used  at  the  United  States  Bureau  of  Standards  for  deter- 
mining the  value  of  a  Faraday.  Complete  as  illustrated  with  anode  of  platinum-iridium, 
cathode  of  platinum,  bulb  tubes,  and  ground-in  siphon  tube.  Price  dependent  upon  market  price 
of  platinum.  (See  Journal  of  American  Chemical  Society,  Vol.  XXXVI,  No.  5,  for  May,  1914, 
page  916.) 

10242.  ELECTRODE,  Calomel  Normal,  Bloom,  designed  specially  for  measurements  in  Physiological 
Chemistry.  With  f used-in  platinum  electrode,  ground  on  tube  and  cap 4.50 

10244.  ELECTRODE,  Calomel  Normal,  Drucker,  with  fused-in  platinum  electrode  and  side  tube,  without 
stop-cock  on  siphon  tube 1.50 

10246.  ELECTRODE,  Calomel  Normal,  Hildebnmd,  with  glass  stop-cock  on  siphon  tube  and  fused-in 
platinum  electrode.  (See  Journal  of  American  Chemical  Society,  Vol.  XXXV,  No.  7,  for  July 
1913,  page  851) ' 3.75 

10248.  ELECTRODE,  Calomel  Normal,  Ostwald,  with  removable  platinum  electrode  and  glass  stop-cock 
on  siphon  tube 7.50 

10250.  ELECTRODE,  Calomel  Normal,  Pauli,  for  liquids  of  high  resistance,  with  removable  platinum 
electrode,  and  short  siphon  tube 5.00 

10256.  ELECTRODE,  Dipping,  for  good  conductors,  for  immersion  in  liquids  to  be  tested;  in  protecting 
cylinder,  with  platinum  electrodes.  Weight  of  platinum,  about  1.3  grams 15.00 

10258.  ELECTRODE,  Dipping,  for  poor  conductors,  with  parallel  platinum  electrodes.  Weight  of 
platinum,  about  1.2  grams 15.00 

10260.  ELECTRODE,  Dipping,  for  poor  conductors,  similar  to  No.  10258,  but  of  larger  capacity.  Weight 
of  platinum,  about  0.6  gram 12.50 

10264.  ELECTRODE,  Pipette,  for  poor  conductors,  for  measuring  solutions  affected  by  the  air  and  for 
measuring  solutions  at  100°  C.  With  glass  stop-cock.  Weight  of  platinum,  about  1.6  grams 

15.00 


398 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  10270.  No.  10272. 


No.  10274. 


Nos.  10278-9. 


Nos.  10282-3. 


No.  10286. 


No.  10292. 


No.  10294. 


10270.  ELECTRODE,  Gas,  Hasselbalch,  for  use  in  Hydrogen  Ion  determinations.  With  ground  in  stopper 
carrying  binding  post  ana  platinum  electrode,  two  side  tuoes  with  glass  stop-cocks,  and  siphon 
tube  with  glass  stop-cock $15.00 

10272.  ELECTRODE,  Gas,  Hildebrand,  with  S-shaped  platinum  electrode  so  situated  that  half  its  surface 
is  immersed,  the  other  half  exposed  to  the  gas.  "With  side  tube  for  introduction  of  gas.  (See 
Journal  of  American  Chemical  Society,  Vol.  XXXV,  No.  7,  for  July  1913,  page  850) 7.50 

10274.  ELECTRODES,  Gas,  Long,  simple  form  for  use  in  determining  the  Hydrogen  Ion  Concentration 
in  urine,  blood,  etc.  Complete  with  two  glass  cells  with  rubber  stoppers  and  platinum  elec- 
trodes, mounted  on  wooden  stand  as  illustrated,  without  clamps  or  rubber  tubing 8.00 

10278.  ELECTRODE,  Gas,  Ostwald,  with  gas  introduction  tube,  siphon  tube  with  glass  stop-cock,  and 

gas  exit  tube  with  trap  to  prevent  entrance  of  air,  but  without  platinum  electrode. . . .       4.00 

10279.  ELECTRODE  for  No.  10278,  with  platinum  foil  attached  to  glass  tube  inserted  in  rubber. stopper. 

Weight  of  platinum,  about  1.2  grams 7.50 

10280.  ELECTRODE  for  No.  10278  with  platinum  deposited  on  glass  tube  inserted  in  rubber  stopper,  and 

with  internal  contact,  according  to  Luther 2.50 

10282.  ELECTRODE,  Gas,  Ostwald-Luther,  similar  to  No.  10278,  but  with  longer  gas  introduction  tube, 

siphon  adjustable  in  height,  and  with  ground  in  tubulation   to   take   electrode,  but   without 
electrode 5-00 

10283.  ELECTRODE  for  No.  10282,  with  platinum  deposited  on  glass  tube  and  with  rubber  stopper  to  fit 

tubulation 2.50 

10286.  SUPPORT  for  Calomel  and  Gas  Electrodes,  consisting  of  a  heavy  non-corrosive  metal  base  and 

rod  with  clamp  to  hold  glass  cells 2.75 

HYDROGEN  ION  DETERMINATION  APPARATUS.  For  the  determination  of  the  Hydrogen 
Ion  Concentration  by  means  of  Gas  Electrodes  Nos.  10270  to  10283,  we  recommend  the  use  of 
our  No.  10436  Conductivity  Bridge  together  with  a  Calomel  Electrode  (No.  10242  to  10250),  one 
of  our  Resistance  Boxes  (see  Nos.  F4701  to  F4722),  our  No.  F4465  Portable  Galvanometer,  and 
an  appropriate  source  of  current.  A  Capillary  Electrometer  (Nos.  10292  to  10298)  can  be  used 
if  desired  instead  of  a  Galvanometer. 

10292.  ELECTRODE  TUBE,  Capillary,  Lippmann,  horizontal  form,  without  electrodes 60 

10294.  ELECTRODE  TUBE,  Capillary,  Luther,  filled,  exhausted  and  permanently  sealed,  with  platinum 
contacts  sealed  in 3.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


399 


No.  10296.  No.  10298.  No.  10304. 


C  D 

No.  10305. 


No.  10318. 


No.  10324. 


No.  10326. 


No.  10328. 


10296.  ELECTRODE  TUBE,  Capillary,  Ostwald,  without  electrodes $1.25 

1029S.  EIiECTBODE  TUBE,  Capillary,  Ostwald,  with  platinum  wire  sealed  in 1.50 

10304.  HALF  ELEMENTS,  consisting  of  two  glass  vessels  on  supports  with  heavy  non-corrosive  bases, 

with  adjustable  clamps  and  hard  rubber  terminals  with  binding  posts.  Complete  with  rubber 
tubing,  glass  cylinder,  pinch  clamps  and  five  different  styles  of  electrodes  as  illustrated  18.00 

10305.  ELECTBODES  only  of  No.  10304,  mounted  in  glass  tubes,  inserted  in  robber  stoppers. 

No A  B  C  D  E 

Style platinum  foil    platinum  ring     silver  spiral       zinc  rod       copper  rod 

Each 2.00  1.00  1.50  .80  .80 

10306.  GLASS  CELL  only  of  No.  10304 1.25 

10307.  GLASS  CYLINDER  only  of  No.  10304,  for  connecting  the  two  elements 60 

F4404.  INDUCTION  COIL,  simple  form,  after  Walker,  in  sound-proof  box 8.00 

10318.  IONIZATION  CELL,  Smith  and  Hale,  with  electrodes  consisting  of  glass  tubes  with  fused-in 

platinum  wire,  welded  to  copper  wire  for  connection.  Complete  as  illustrated  with  two  cells 
with  rubber  stoppers,  mounted  in  paraffined  hardwood  block 4.50 

10324.  MIGRATION  TUBE,  with  silver  and  copper  electrodes  sealed  in  glass  tubes,  inserted  in  rubber 
stoppers.  With  glass  stop-cock 6.00 

10326.  MIGRATION  TUBE,  Findlay,  with  silver  electrodes  cemented  in  glass  tubes  inserted  in  rubber 
stoppers,  with  detachable  TJ  tube  and  three  glass  stop-cocks  for  withdrawing  liquid  for  an- 
alysis. (See  Findlay 's  Practical  Physical  Chemistry,  page  211) 15.00 

10328.  MIGRATION  TUBE,  Loeb  and  Nernst,  for  silver  salts,  with  cathode  of  silver  foil  and  anode  of 
silver  wire  in  a  flat  spiral,  in  glass  tubes  inserted  in  rubber  stoppers 4.50 

10330.  MIGRATION  TUBE,  Loeb  and  Nernst,  same  as  No.  10328,  but  with  stop-cock  at  bottom  for 
withdrawing  solution  for  analysis.  (See  Findlay 's  Practical  Physical  Chemistry,  page  207) 
6.00 


400 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  10340. 


Nos.  10364-7. 


10340.  MOLECULAR  WEIGHT   DETERMINATION    APPARATUS,    Beckmann 's,    by    the    Freezing 

Point  Method.  Consists  of  a  glass  cooling  jar  with  nickeled  cover  and  stirrer,  4  air  jackets, 
4  freezing  tubes  with  corks,  3  filling  pipettes,  1  inoculating  rod,  1  rubber  stopper,  zinc  trough 
with  glass  siphon  for  drawing  off  the  cooling  solution,  and  sulphuric  acid  drying  tube  for  use 
with  hygroscopic  solutions,  but  without  thermometers  $18.00 

Parts  and  Accessories  for  No.  10340. 

10341.  AIR  JACKET 75 

10342.  COOLING  VESSEL  with  nickeled  cover  and  stirrer 3.25 

10343.  FILLING  PIPETTE 1-00 

10344.  FREEZING  TUBE,  with  corks 1.00 

10345.  FREEZING  TUBE,  with  ground  in  stopper  and  ground  in  tubulation  for  thermometer.  . . .       2.00 

10346.  INOCULATING  ROD 80 

10347.  STIRRER  of  glass  with  platinum  ring  containing  about  2.1  grams  platinum.     Price  dependent  on 

market  price  of  platinum. 

10348.  SULPHURIC  ACID  DRYING  TUBE 1.00 

13452.  THERMOMETER  for  cooling  mixture,  graduated  from  -20°  to  40°  C.,  in  1  degree  divisions       2.00 
13518.  THERMOMETER,  Beckmann  Differential,  with  auxiliary   scale,   graduated  in  1/100   degree   di- 
visions          20.00 

10350.  ZINC  TROUGH,  with  siphon 2.80 

10351.  SIPHON  only  of  No.  10350 1-00 

10364.  MOLECULAR   WEIGHT   DETERMINATION  APPARATUS,  Beckmann,  by  the  Boiling  Point 

Method.  Consists  of  an  iron  support  with  clamp  and  ring;  boiling  cylinder  with  drying  tube, 
ground  stopper  and  tubulature,  and  with  inner  condenser;  one  pair  glass  jackets  with  mica 
cover  plate  and  asbestos  pad;  rubber  stoppers;  but  without  burner  or  thermometers. ..  18.00 

10365.  BOILING  POINT  TUBE  for  No.  10364,  with  ground  in  stopper  and  tubulature 8.00 

10366.  MICRO-BURNER  for  No.  10364,  with  glass  chimney 1.50 

10367.  STEAM  JACKET  for  No.  10364,  for  use  with   liquids   of   high   boiling   points,   with   inner   con- 

denser         6-°° 

THERMOMETER,  Beckmann  Differential,  for  No.  10364,  see  No.  13518. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


401 


No.  10372. 


No.  10376. 


No.  10380. 


No.  F937. 


No.  10396. 


1037-2.  BOILING  POINT  APPARATUS,  Jones,  with  ground  in  stopper  and  side  tubulation $4.00 

10376.  MOLECULAR  WEIGHT  DETERMINATION  APPARATUS,  McCoy,  consisting  of  a  graduated 
inner  vessel  and  jacket  with  rubber  connection  between.  (See  Journal  of  American  Chemical 

Society,  VoL  XXII,  for  April  1900) 7.00 

10380.  MOLECULAR  WEIGHT  DETERMINATION  APPARATUS,  Menzies,  for  determining  molecular 
weights  by  measurements  of  the  vapor  pressure.  The  apparatus  consists  of  a  graduated  inner 
vessel  and  outer  jacket  ground  together.  It  can  be  used  for  two  purposes:  (1)  the  deter- 
mination of  the  molecular  weights  of  dissolved  substances  by  measuring  the  lowering  of  vapor 
pressure  of  the  solution;  (2)  the  determination  of  molecular  weights  of  easily  volatile  sub- 
stances by  measuring  their  vapor  pressures.  It  requires  no  thermometer  or  accessory  appar- 
atus, and  can  be  supported  on  any  ring  stand.  A  complete  determination  requires  only  from 

30  to  40  minutes  including  the  time  of  weighing.     Complete  as  described 8.00 

F937.  OSMOTIC  PRESSURE  TUBE,  University  of  Chicago  form,  consisting  of  a  glass  tube  of  small 
bore  5  feet  long,  with  side  arm  with  stop-cock  and  funnel  tube.     Complete  with  membrane  for 

attachment  to  lower  end 4.50 

F937A.  ANIMAL  MEMBRANES  for  use  with  No.  F937 each        .25 

POLARIZING  APPARATUS,  see  Polariscopes. 
PYCNOMETERS,  see  Bottles,  Specific  Gravity. 

RESISTANCES  AND  RHEOSTATS,  see  general  heading  Electrical  Instruments. 

10396.  SURFACE  TENSION  APPARATUS,  simple  form,  with  straight  capillary  tube  of  fine  bore,  glass 
scale  graduated  in  mm  and  immersion  tube  with  side  arm  and  rubber  stopper.  (See  Findlay's 

Practical  Physical  Chemistry,  page  91) 2.50 

THERMO-REGULATORS,  see  general  headiug  Thenno-Regulators. 
10408.  THERMOSTAT  BATH,  Aquarium  Type,   DeKhotinsky    Electrically    Heated    and    Regulated 

(Patented),  with  precision  mercury  thermo-regulator  and  sensitive  iron  clad  relay. 
Construction: — The  bath  in  constructed  of  heavy  plate  glass  cemented  in  a  frame  work  of  angle 
iron,  with  supporting  legs  of  heavy  cast  iron  bolted  to  the  frame.  The  bottom  is  also  of 
plate  glass  set  in  Portland  cement,  supported  by  a  plate  of  reinforced  iron.  The  cement  used 
to  hold  the  glass  sides  is  a  special  composition  which  remains  plastic,  preventing  any  possi- 
bility of  leakage  due  to  drying.  Extensive  experiments  conducted  at  the  University  of  Chi- 
cago have  shown  the  lack  of  necessity  for  heat  insulating  material  around  a  bath  for  use  at 
temperatures  from  10°  to  60"C.  For  this  reason,  we  have  abandoned  the  old  type  of  con- 
struction and  have  adopted  the  aquarium  style  of  bath,  because  of  its  superiority  in  render- 
ing the  interior  of  the  bath  visible  from  any  position  and  admitting  light  to  every  corner. 
The  bath  should  be  filled  with  distilled  water  to  avoid  the  formation  of  deposits  on  the  glass 
sides. 

Stirring  is  accomplished  by  means  of  a  high  speed  turbine  stirrer  of  nickel-plated  brass,  which 
takes  water  from  the  bottom  of  the  bath  at  the  rate  of  45  liters  per  minute  and  delivers  it  at 
the  top  with  an  expenditure  of  energy  of  45  watts.  An  extra  pulley  is  provided  at  the  top 
of  the  shaft  to  connect  with  stirrers  in  any  apparatus  placed  in  the  bath. 

Heating  of  the  bath  is  effected  by  means  of  four  electric  heating  units  inserted  in  seamless 
brass  tubes,  fastened  together  in  sets  of  two  and  attached  by  machine  screws  to  the  side. 
These  are  connected  in  parallel,  two  of  them  being  automatically  switched  on  and  off  by  the 
relay.  In  order  to  maintain  the  temperature  through  warm  weather  or  at  temperatures  below 
that"  of  the  room,  two  cooling  coils  are  provided  made  of  nickel-plated  brass  tubing  of  6  mm 
inside  diameter  and  20  meters  in  length,  which  lie  close  to  the  sides  and  bottom  of  the  bath, 
entirely  out  of  the  way.  Through  these  coils  may  be  passed  city  water  or  iced  water  to 
maintain  the  desired  temperature. 

Temperature  control  is  secured  by  means  of  the  DeKhotinsky  precision  thermo-regulator,  con- 
sisting of  two  solid  drawn  steel  tubes,  covered  with  brass,  and  connected  to  a  common  head. 
To  this  is  attached  a  glass  capillary  with  regulating  cap,  by  which  the  platinum  point  may 
be  raised  and  lowered  to  change  the  temperature  setting.  Coarse  regulation  may  be  effected 
by  turning  the  knurled  screw  by  which  the  capillary  is  attached  to  the  regulator  head,  thus 


402 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  10408-10. 


Showing  the  De  Khotinsky  Aquarium  Type  Thermostat  Bath,  set  up  complete,  ready  for  operation. 
This  Thermostat  is  being  used  in  the  Physical  Chemistry  Laboratories  of  the  University  of  Chicago 
and  other  leading  universities  -with  entire  satisfaction.  The  illustration  shows  the  large  amount  of 
space  available  for  use  and  the  unobstructed  illumination  from  all  sides. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TL  S.  A. 


403 


No.  10418. 


No.  10420.  No.  10422. 


No.  10436. 


No.  P5101. 


THERMOSTAT  BATH,  Aquarium  Type,  Continued. 

laising  or  lowering  the  mercury  level.  The  capacity  of  the  steel  tubes  and  the  diameter  of 
the  capillary  are  so  proportioned  as  to  secure  a  regulation  of  0.005°C.,  or  less,  which  is  more 
sensitive  than  a  Beckmann  thermometer.  To  eliminate  vibration  of  the  mercury  surface  in 
the  capillary  chamber  and  prevent  sparking,  the  thermo-regulator  is  suspended  by  two 
springs.  The  thermo-regulator  is  in  circuit  with  our  sensitive  iron  clad  relay,  of  the  solenoid 
type  with  multiple  contacts,  the  opening  and  closing  of  which  makes  and  breaks  the  current 
through  the  regulating  units. 

The  entire  design  of  the  bath  has  resulted  from  actual  laboratory  experience  throughout 
many  years  with  baths  of  various  makes,  and  we  have  no  hesitation  in  stating  that  it  is 
superior  in  design  and  in  effectiveness  to  any  other  type.  The  small  space  taken  up  by  the 
heaters,  regulator,  stirrer  and  cooling  coils,  together  with  the  absence  of  any  grating  or  par- 
tition, leaves  the  entire  inside  space  available  for  use.  Complete  as  described  with  four  heat- 
ing units,  thermo-regulator,  relay,  turbine  stirrer  with  motor  for  operation,  constant  water 
level  device  and  drain,  two  nickel-plated  brass  support  rods  with  two  clamps  each,  and  five 
feet  of  cord  and  separable  attachment  plug. 

Length,  61  em.  Height  from  floor,  80  cm. 

Width,  61  cm.  Capacity,  225  liters. 

Depth,  61  cm. 

No A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    $277.50      280.00       275.00       277.50 

10410.  THERMOSTAT  BATH,  Aquarium  Type,  DeKhotinsky  Electrically  Heated  and  Regulated,  same 

as  No.  10408,  but  larger,  with  same  equipment. 

Length,  71  cm.  Height  from  floor,  80  cm.- 

Width,  70  cm.  Capacity,  300  liters. 

Depth,  61  cm. 

No A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    302.50       305.00       300.00       302.50 

10411.  ROD  CLAMPS  for  use  with  Xos.  10408  and  10410 each      1.25 

For  other  THERMOSTATS,  see  Water  Baths. 

10418.  TRANSFERENCE  TUBE,  Washburn,  for  the  study  of  hydration  of  ions,  etc.  Complete  as  illus- 
trated with  two  stop-cocks  with  bore  equal  to  that  of  the  tube,  ground  in  glass  plugs  at  the 
ends,  ground  joint  in  the  middle  and  sealed  on  tubes  for  obtaining  samples  to  be  analyzed, 
with  ground  in  stoppers.  Without  electrodes.  (See  Journal  of  American  Chemical  Society, 

Vol.  XXXI,  for  1909,  page  322) 18.00 

VAPOR  DENSITY  APPARATUS,  see  general  heading  Vapor  Density  Apparatus. 
10420.  VISCOSITY  PIPETTE,  Drucker,  with  glass  stop-cocks.  Time  of  outflow,  80  to  100  seconds    5.00 

10422.  VISCOSITY  PIPETTE,  Ostwald,  with  time  of  outflow  80  to  100  seconds 1.25 

F5101.  VOLTAMETER,  Copper,  new  construction.  Consists  of  a  glass  jar  in  which  are  suspended 
three  copper  plates,  two  loss  plates  and  one  gain  plate,  each  of  about  40  square  centimeters 
area.  These  plates  are  held  by  an  ingenious  clamping  device  and  their  construction  is  such 

that  they  may  be  handled  without  touching  with  the  fingers 4.50 

F5102.  VOLTAMETER,  Silver,  same  construction  as  No.  F5101,  with  detachable  silver  plates..  9.00 
10436.  WHEATSTONE  BRIDGE  for  Conductivity  Measurements.  Extended  Coll  Type,  as  developed 
at  the  University  of  Illinois.  The  bridge  is  of  the  usual  slide  wire  form  with  a  half  meter 
scale  graduated  on  the  upper  half  from  475  to  525  cm  and  on  the  lower  half  from  0  to  50 
cm  in  0.1  cm  divisions.  A  wire  of  very  low  thermal  coefficient  but  of  high  resistance  is 
stretched  over  the  scale,  and  a  sufficient  amount  is  wound  on  two  spools,  placed  at  the  ends, 
to  make  1000  cm  of  total  length,  exactly  divided  as  to  resistance.  By  means  of  removable 
plug  contacts,  the  bridge  may  be  used  either  as  a  half-meter  or  as  a  ten-meter  bridge.  In 
this  way  the  resistance  of  a  solution  may  be  approximately  determined  on  the  half -meter 
scale,  the  plugs  then  removed  and  the  exact  point  determined  on  the  ten-meter  scale.  By 
using  this  bridge,  readings  can  be  readily  made  with  an  accuracy  of  0.01  of  1  per  cent. 30.00 
For  other  WHEATSTONE  BRIDGES,  see  general  heading,  Electrical  Instruments. 


404 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  1320.  No.  10464.  No.  10470  No.  10476.  No.  10481. 

No.  10460.  No.  10466.  No.  10472.  No.  10480.  No.  10486 

PICKS,  Mineralogical,  see  Hammers. 
PILL  BOXES,  see  Boxes. 
PINS,  Insect,  see  Insect  Pins. 

10448.    PINS,  ordinary,  stiff  and  sharp  pointed,  in  y->  pound  boxes Per  box         $1.00 

10454.    PIPES,  Clay Per  dozen        .25 

PIPETTES 

PIPETTE,  Automatic  Dropping,  with  rubber  bulb,  for  delivering  exactly  1  cc.     Convenient  for 
filling    ampoules 1.00 

PIPETTES,  Automatic  Overflow,   with   patent  three-way  stop-cock,  and  reservoir  for  collecting 
the  excess. 

Capacity,   cc    10  25  50 

Each    3.50  3.60  3.75 

PIPETTE,  Automatic  Overflow,  same  as  No.  10460,  but  with  capacity  of  17.6  ec  for  Milk 
Testing  3.50 

PIPETTE,  Calibrating,  Ostwald's,  capacity  2  cc 80 

PIPETTE,  Capillary,  for  preparing  milk  smears  on  microscope  slides  for  counting  the  bacteria 
present.  Graduated  at  i^oo  cc.  With  a  6.4X  ocular  and  a  1.9  mm  objective  (oil  immersion), 
a  195  mm  tube  furnishes  an  apparent  field  of  %ooo  square  cm.  (See  Bulletins  373  and  378 
of  the  New  York  Experiment  Station) 1.00 

PIPETTES,  Double  Automatic,  with  stop-cock  so  made  that  one  pipette  fills  while  the  other 
empties. 

Capacity,   cc    25  50  100 

Each    7.00  7.50  8.00 

PIPETTE,  Double  Automatic,  Rothe's,  for  use  in  determining  iron  as  perchloride  by  means  of 
ether.     Graduated  to  200  cc  as  illustrated 12.00 

PIPETTES,  Dropping,  Medicine  Droppers,  with  rubber  bulb.     Length,  4  inches;  capacity,  about 

.30 


1320. 
10460. 

10461. 

10464. 
10466. 

10470. 

10472. 
10476. 

10477. 
10480. 


2    ee Per  dozen 

PIPETTES,  Dropping,  same  as  No.  10476,  but  with  tip  curved Per  dozen 

PIPETTES,  Dropping,  straight,  without  bulb. 


.30 


Length,  inches 8  12 

Each .10  .15 

10481.   PIPETTES,  Dropping,  same  as  No.  10480,  but  with  rubber  bulb  of  25  cc  capacity. 

Length,  inches 8  12 

Each 30  .45 

(Other  lengths  will  be  made  to  order.) 
PIPETTES,  Gas,  see  Gas  Analysis  Apparatus. 

10486.  PIPETTE,  Glucose,  Spencer's,  capacity  50  cc,  graduated  from  5°  to  20°  on  the  Brix  scale  in. 

2.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  B.  A. 


405 


No. 

10490. 


No. 

10492. 


No.        No. 
10496.  10498. 


No. 

10502. 


No.      No. 
10506.  10510. 


No. 
10514. 


No. 
10516. 


No. 

10520. 


No. 

10524. 


10490.  PIPETTE,  Mercury,  for  taking  up  drops  without  danger  of  drawing  them  into  the  mouth       $0.35 
10492.  PIPETTE,  Mercury,  for  handling  small  drops  of  mercury 35 

10496.  PIPETTES,  Mohr's,  accurately  graduated  in  ec  and  fractions. 

No A  B  C  D  E  F  G  H  J  K 

Capacity,  ce- }{0  1  1  2  5  10  20  25  50  100 

Graduated  to,  cc..    Hoo       Moo        Mo         Mo         Mo         Mo  Mo  Mo  Mo  Mo 

Each 40          .45          .40         .35          .40          .45  .55  .60  1.00  1.10 

* 

10498.  PIPETTES,  Mohr's,  same  as  No.  10496,  but  with  glass  stop-cock. 

Capacity,    cc 25  50 

Graduated    to,    cc ' Mo  Mo 

Each    1.70  1.90 

10502.  PIPETTES,  Ostwald,  as  used  in  the  determination  of  nitrogen,  urea  and  ammonia  in  urine  by 
the  Folin  method. 

Capacity,   cc    1  2 

Each    1.00          1.00 

10506.  PIPETTES,  Serological,  similar  to  No.  10496,  but  graduated  to  the  extreme  tip. 

No A  B  C  D  E 

Capacity,  ce   }io  1  1  5  10 

Graduated  to,  cc ^ioo          }{oo  Mo  Mo  Mo 

Each   30  .40  .30  .30  .35 

10510.  PIPETTE.  Sucrose,  capacity  52.096  cc,  graduated  from  5"  to  25°  on  the  Brix  scale  in  Motus  2-50 
PIPETTE,  Viscosity,  see  Nos.  10420-2. 

10514.   PIPETTES,  Volume  or  Transfer,  with  bulb  approximately  in  middle  of  tube. 

Capacity,  ec 1        2        3       5       10      12      15      20      25      30      50      75    100    200 

Each  ..' 10     .11     .12    .15     .17     .20     .24     .26     .28     .30     .35     .45     .50     .60 

10516.  PIPETTES,  Volume  or  Transfer,  without  bulb,  as  used  in  bacteriological  work  and  water  anal- 
ysis. 

Capacity,  cc   1  5  10 

Each    10  .15  .25 

10520.  PIPETTE,  Wassennann  Safety,  for  bacteriological  and  serological  work,  designed  to  prevent 
any  danger  of  infection  in  handling  samples.  Sliding  the  glass  cap  upward  with  tubulation 
closed  by  the  finger  fills  the  pipette.  Delivery  is  controlled  by  the  finger.  Graduated  from 
the  tip  to  1^0  cc  in  Mooths 80 

10524.  PIPETTES,  Water  Analysis,  as  used  in  the  Hygienic  Laboratory  of  the  United  States  Public 
Health  Service.  Set  consists  of  three  pipettes;  one  11  cc  pipette  graduated  at  0,  10  and  11 
ce;  one  10  ec  pipette  graduated  from  0  to  10  cc  in  single  cc;  and  one  2  cc  pipette  graduated 
from  0  to  1  cc  in  Mflths  and  with  mark  at  2  ee. 

Capacity,  cc    2  10  11 

Each   30  .30  .35 

PIPETTES,  Weighing,  see  Bottles,  Weighing. 


406 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  10544.  No.  10548. 


No.  10556. 


No.  10560. 


No.  10574. 


PIPETTES,  PRECISION  OR  NORMAL 


10.130.  PIPETTES,  Mohr's,  Precision  or  Normal,  graduated  at  20°C.,  to  meet  the  requirements  of  the 
United  States  Bureau  of  Standards.  With  unofficial  factory  certificate. 

No A              B              C              D  E  F 

Capacity,   cc    •. 1                1                5               10  25  50 

Graduated  to,  cc Moo           Mo            Mo            Mo  Mo  Mo 

Each    $1.35          1.20           1.75           1.80  2.50  3.35 

9 

10531.  PIPETTES,  Mohr's,  Precision  or  Normal,  same  as  No.  10530  but  standardized  by  the  United 
States  Bureau  of  Standards.  With  control  stamp. 

No A              B              C              D  E  V 

Capacity,  cc   1               1               5              10  25  50 

Graduated  to,  cc i,ioo           Mo            Mo            Mo  Mo  Mo 

Each    •. 3.70           3.40           3.80           4.50  5.60  6.00 

10536.  PIPETTES,  Volumetric,  Precision  or  Normal,  graduated  at  20°C.,  to  meet  the  requirements  of 

the  United  States  Bureau  of  Standards.     With  unofficial  factory  certificate. 

Capacity,  ee  1  2  5  10  25  50  100 

Each     60  .70  .75  .90          1.05          1.20          1.65 

10537.  PIPETTES,  Volumetric,  Precision  or  Normal,  same  as  No.  10536,  but  standardized  by  the  United 

States  Bureau  of  Standards.     With  control  stamp. 

Capacity,  cc   1  2  5  10  25  50  100 

Each     1.90  1.90  2.00  2.10  2.25  2.60  3.40 

10544.  PIPETTE  BOTTLE,  with  pipette  ground  into  neck  and  cap  ground  on.  For  use  with  volatile 
and  poisonous  liquids. 

Capacity,  cc   10             25             50  100 

Each    2.50  3.00          3.50  4.00 

For  other  PIPETTES,  see  Blood  Testing  Apparatus. 

10548.  PIPETTE  BOX,  cylindrical,  for  use  in  sterilizing  pipettes,  of  sheet  copper,  with  tightly  fitting 

cover  with  handle.     Length,  15  inches;   diameter,  2  inches 1.80 

10549.  PIPETTE  BOX,  cylindrical,  same  as  No.  10548,  but  made  of  sheet  iron 1.30 

10552.  PIPETTE  BOX,  rectangular  form,  of  sheet  copper,  with  overhanging  cover  with  handle.     Size, 

2x2x12%    inches 3.30 

10553.  PIPETTE  BOX,  same  as  No.  10552,  but  made  of  sheet  iron 1.75 

10556.  PIPETTE  REST,  of  porcelain 60 

10560.  PIPETTE  SUPPORTS,  of  hardwood,  revolving,  for  12  pipettes 2.70 

PITCHERS,  Acid,  see  Acid  Pitchers. 

10570.    PLANE,  Block,  iron,  5%  inches  long,  1*4 -inch  cutter 80 

10572.  PLANE,  Double  End,  iron,  8  inches  long,  1*4 -inch  cutter.  This  plane  may  be  used  as  a  block 
plane,  or  by  reversing  the  cutter  and  wedge  it  can  be  used  to  plane  close  up  into  corners  or 
other  difficult  places 1.80 

10574.    PLANE,  Jack,  wood  bench  plane,  2-ineh  cutter,  double  iron 1.40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


407 


No.  10606  (shown  in  horizontal  position) . 


No.  10686.    No.  10690.    No.  10692.  No.  10696.  No  10606  (snown 

No.  10590.  PLANT  PHYSIOLOGY  APPARATUS         vertical^osition). 

(This  section  has  been  practically  eliminated  on  account  of  the  difficulty  in  obtaining  deliveries.  A 
return  to  normal  conditions  will  result  in  a  large  section  being  inserted  in  the  catalog  covering  the  re- 
quirements for  this  subject.) 

10590.  AUXANOMETER,  a  :  imple  and  practical  apparatus  for  measuring  plant  growth.  A  silk  thread 
attached  to  the  plant  passes  over  a  pulley  with  which  it  is  held  in  close  contact  by  a  weight. 
This  pulley  moves  freely  and  the  pointer  attached  to  it  is  provided  with  a  counterbalance. 
The  scale  is  accurately  divided,  each  division  representing  a  growth  of  .01  inch,  and  may  be 

placed  at  any  desired  height  on  the  support  rod $4.50 

10606.  CLINOSTAT,  for  investigations  involving  plants  of  moderate  weight  where  great  precision  olf 
revolution  is  not  required.  It  consists  essentially  of  the  works  of  a  powerful  eight-day  clock, 
geared  to  a  revolution  in  fifteen  minutes  and  enclosed  in  a  practically  dust  and  moisture-proof 
case,  16  cm  in  diameter.  A  ball-bearing  shaft  takes  the  strain  from  the  works,  which  are 
started  and  stopped  by  a  cylindrical  nut  projecting  from  the  upper  surface.  It  is  to  be  wound, 
not  too  tightly,  once  in  two  days,  which  may  be  accomplished  without  disturbing  the  plant. 
Properly  used"  it  will  carry  a  4-inch  or  smaller  pot  horizontally,  or  a  larger  size  vertically. 
As  with  all  clinostats,  however,  it  revolves  with  greater  evenness  the  smaller  the  weight  it 
has  to  carry,  and  consequently  the  smallest  pots  allowed  by  the  subject  under  study  should 
be  used.  The  size  with  which  the  instrument  works  best  is  the  three-inch,  this  size,  how- 
ever, being  larger  than  commonly  supposed,  since  the  measurements  of  pots  are  all  internal. 

Complete  as  described  with  directions  for   use 25.00 

PLATE,  Arsenic,  see  Arsenic  Plate. 
PLATES,  Asbestos,  see  Asbestos  Pads. 
PLATES,  Desiccator,  see  Desiccators. 
10686.  PLATES.   Glass,   circular,   for  covering  beakers,  dishes,  etc.    Edges  not  ground. 


Diameter,    mm 60  80 

Each    06  .08 

10688.  PLATES,  Glass,  circular,  same  as  Xo.  10686,  but  ground  on  one  side. 

Diameter,  mm 60  80 

Each    10  .12 

10690.  PLATES,  Glass,  circular,  snme  as  No.  10686,  but  with  hole  in  center  for  stirring  rod. 

roughly  ground.    Diameter,  mm 75 

Each    20 

10692.  PLATES,  Glass,  circular,  same  as  No.  10690,  but  with  hole  at  side  for  stirring  rod. 


100  120 

.12  .U 

Edges  not  ground. 
100  120 

.16  .20 


Diameter,  mm 

Each    

10696.    PLATES,  Glass,  square,  for  covering  jars,  beakers,  etc. 

Length  of  side,  mm 50 

Each 03 

Per  dozen 25 


60              80             100  120 

.15             .20             .25  .30 
Edges  not  ground. 

75           100          150  200 

.04           .05           .10  .16 

.40           .50           .95  1.60 


150 
.16 

150 

.24 

Edges 

100 
.25 

150 
.40 

250 

.25 

2.50 


10698.   PLATES,  Glass,  square,  same  as  No.  10696,  but  of  double  thick  glass  and  ground  on  one  side. 

Edges  not  ground.     No A  B  C  D  E  P 

Length  of  side,  mm 50  75  100          150  200  250 

Each 04  .05  .06  .09  .20  .30 

Per  dozen 40          .50          .60          .90          2.00          3.00 

10702.  PLATES,  Glass,  heavy  plate,  square,  ground  rough  on  one  side,  with  edges  slightly  ground. 
For  use  with  bell  jars,  etc. 

Length  of  side,  mm...      100  125  150  200  250  300  375  500 

Each    30  .40  .50  .70  1.20  1.50  2.25          3.75 

10708.   PLATES,  Glass,  blue  cobalt,  rectangular,  for  flame  tests. 

Size,  mm 50x50          50x75          75x75          75x100          100x100 

Each 10  .12  .15  .20  .25 


408 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  10756. 


No.  10760. 


No.  10720. 


No.  10750. 


No.  10746. 


fF7151.  PLATES,  Glass,  colored,  of  best  pot  glass,  10  cm  square.    Colors  as  near  spectral  as  possible  to 
produce.     Edges  not  ground. 


B 

indigo 
.15 


C 
blue 
.15 


D 

green 


.15 


E 

yellow 
.15 


No A 

Color     violet 

Each $0.15 

PLATES,  Hot,  see  Hot  Plates. 

PLATES,  Porcelain  Filter,  see  Filter  Disks  No.  5366.. 

10720.  PLATE,  Porcelain,  for  color  reactions.     Size  90x110  mm,  with  12  concavities 

10724.  PLATE,  Porcelain,  glazed,  round,  5%  inches  in   diameter 

10726.  PLATE,  Porcelain,  glazed,  square,  5V2x5%  inches    

PLATE,  Porcelain  Streak,  see  Arsenic  Plate. 

7316.    PLATE,  Porous  Clay,  dinner  plates,  for  quickly   drying  precipitates   and   crystals. 
8  inches  


F 

orange 
.15 


G 
red 
.15 


.70 
.75 
.75 


Diameter, 
.25 


PLATINUM  WARE 

Our  platinum  ware  is  warranted  pure  and  of  the  most  approved  shapes.  Dishes  and  crucibles 
are  all  hammered  and  thoroughly  tested  after  being  finished.  We  carry  in  stock  only  those 
forms  for  which  there  is  the  greatest  demand.  All  others  furnished  shortly  after  receipt  of 
order.  Special  shapes  and  designs  will  be  made  to  order.  Platinum  ware  will  be  sent  only 
by  registered  U.  S.  mail.  We  advise  that  scrap  platinum  sent  in  for  credit  or  exchange  be 
shipped  in  the  same  manner.  Old  or  scrap  platinum  is  bought  at  the  market  price.  Weights 
given  below  are  approximate  only. 

Prices  will  be  governed  by  the  Market  Price  of  Platinum. 
1455.     BLOWPIPE  TIP,  Platinum,  for  Plattner  's  blowpipe. 
10740.  BOATS,  Platinum,  for  combustion.     Width,  V2  inch;  depth,  %  inch;  with  handles. 

Length,   inches 1%  2  3% 

Approximate  weight,  grams 3  4  6  6.5 

10742.  BOAT,  Platinum  Filter,  and  Holder,  Blair's,  for  iron  and  steel  analysis.    Length,  about  2  inches; 

width,  about   %   inch;   depth,   about  %e  inch.     Approximate  weight  of  boat  and  holder  com- 
plete, 19  grams. 

10743.  HOLDER  for  Blair's  Platinum  Boat  No.  10742,  of  rubber • 2.50 

10746.  COMBUSTION  TUBE,  Platinum,  Seamless,  12x%  inch,  with  prolongation  5x%  inch;  approxi- 
mate weight,  130  grams.     Other  sizes  to  order. 

10750.  CONES,  Platinum  Filter,  seamless,  60°,  profusely  perforated  with  holes  .016  to  .025  inch. 

Diameter,  inches    %  1  1%         1%  2 

Approximate  weight,  grams - 1  2.1          3.1          5.3          9.2 

10752.  CONE  Of  Wood,  with  wooden  mold,  for  reshaping  platinum  filter  cones  to  the  correct  angle   7.00 

10756.    PLATINUM  CRUCIBLES,  with  cover.     Crucible  and  cover  weigh  approximately  as  many  grams 
as  they  hold  cubic  centimeters.     Covers  are  always  furnished  unless  specified  otherwise. 

Capacity,  cc 8  10  15  20  25  30 

Diameter  and  depth,  mm 22  25  30  33  35  40 

Approximate  weight,  grams 8  10  15  20  25  30 

Prices  will  be  governed  by  the  market  price  of  platinum. 

10760.  CRUCIBLES,  Platinum,  Gooch'S,  with  perforated  bottom,  with  cover  and  cap  for  bottom. 

Capacity,  cc    10         15         20         25 

Diameter  and  depth,  mm 27         32         33         36 

Approximate   weight,   grams 13        18        22        29 


30 
39 
34 

10762.  CRUCIBLE,  Platinum,  Gooch'S,  low  form  with  large  filtering  surface,  as  used  in  bitumen  and 
asphalt  analysis.     Capacity,  30  cc;  approximate  weight,  30  grams. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


409 


No.  10764.  No.  10768 


No.  10794. 


No.  10798. 


No.  10800. 


10764.  CBUCIBLE,  Platinum,  J.  Lawrence  Smith's,  with  cover,  for  alkali  determinations  in  rocks  and 
minerals.     Height,  80  mm;   diameter  at   top,    18   mm;    at  bottom,   15   mm;    capacity,    18   ec; 
approximate  weight  with  cover,  34  grams.     (See  Bulletin  Xo.  422,  United  States  Geological 
Survey,  page  172.) 
10768.  CRUCIBLE,   Platinum,   Shimer's   Combustion,  for  determining  carbon  in  iron  and  steel. 

Capacity,   cc    30 

Approximate  weight,  grams 52 

(Special  booklet  will  be  sent  on  application.) 
10772.  DISHES,  Platinum,  evaporating,  round  bottom,  with  lip. 

Capacity,   ce    15       20       25       35       50 

Diameter,   mm    38       42       44       48       56 

Approximate  weight,  grams.  .5         6         8       12       17 
10774.  DISHES,  Platinum,  Blair's,  for  iron  analysis, 
rimmed.    Capacity,  ec    


60 
93 


/o 
65 


100     125     150     200  250 
72       78       84       94  98 
33       42       50       67  80 
Flat  bottom,  wfth  straight   sides  and  lip,  wire 
280  380     525 


300 

104 

94 


Approximate    weight,    grams 80     100     120 

10778.  DISH,  Platinum,  Classen's,  for  electrolytic  analysis,  with  either  polished  or  sand-blasted  inner 
surface.     Diameter,  90  mm;  depth,  42  mm;  capacity,  250  ec;  approximate  weight,  35  grams. 
(In  ordering  kindly  specify  kind  of  inner  surface  desired.) 
10780.  DISHES,   Platinum,   Incinerating,   rectangular  shape  with  flat  bottom. 

Capacity,  ce 15-        20 

Approximate  weight,  grams 10         14 

10782.  DISH,  Platinum,  Milk  Analysis,  capacity,  45  ec;  approximate  weight,  17  grams. 

10784.  DISH,  Platinum,  Payne's,  for  fertilizer  analysis,  flat  bottom  with  lip,  wire  rimmed,     Capacity, 

100  cc;  approximate  weight.  40  grams. 
10788.  DISH,  Platinum,  Sugar  Analysis,  lipped,  with  flat  bottom  and  straight  sides.     Capacity,  35  cc; 

approximate  weight,  16  -grams. 
10790.  DISH,   Platinum,    Sugar   Analysis,    deep   form    with    handle.      Capacity,    28    cc;    approximate 

weight,    15   grams. 
10792.  DISHES,  Platinum,  Sugar  Analysis,  flat  bottom,  with  or  without  lip  or  handle. 

Capacity,   ec    10         20         25         35 

Approximate   weight,    grams 10         14         18         20 

(In  ordering  specify  whether  lip  and  handle  are  desired.) 

10794.  DISH,  Platinum,  Sugar  or  Milk  Analysis,  with  two  handles  and  lip.    Made  only  to  order.  Capac- 
ity, 45  cc:  approximate  weight,  15  grams. 
10798.  DISH,  Platinum,  Water  Analysis,  round  bottom,  shallow  form,  without  lip.     Capacity,  100  ce. 

Approximate  weight.  20  grams. 

10800.  DISH,  Platinum,  Water  or  Iron  and  Steel  Analysis,    shallow    form    with   lip.      Capacity,   45   ce; 
approximate  weight,   15  grams. 


410 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  10806A.  No.  10806B.  No.  10806C.      No.  10808A.    No.  10808B.   No.  10808C.     No.  10810. 


No.  10828. 


No.  10812B.   No.  10812C.   No.  10814. 


No.  10822. 


No.  10834. 


1080C.  ELECTRODES,  Platinum  Anodes,  for  electro-analytical  work,  made  of  heavy  wire. 

No .' A  B  C 

Length,   mm    150         150         125 

Diameter  of  spiral,   mm 38  50  15 

Approximate  weight,  grams 8-9  20  7 

10808.  ELECTRODES,  Platinum  Cathodes,  for  electro-analytical  work,   made  of  platinum  sheet. 

No A  B  C 

Diameter,   mm    57  25  25 

Length  of   electrode,  mm 75  50  50 

Approximate    weight,    grams 20  11  11 

10810.  ELECTRODE,  Platinum  Gauze  Cathode,  Hollard's,  with  special  wire  frame  anode,  designed  to 
prevent  formation   of  bubbles.     Approximate  weight,  37  grams.    Diameter  of  anode,  2  inches. 

10812.  ELECTRODES,  Platinum  Gauze,  cylindrical  form,  of  52-mesh  gauze.    Diameter,  25  mm;  height 
of  cylinder,  50  mm. 

No A  B  C 

Form     open        closed     rotating 

Approximate  weight,  grams 7  6  18 

10814.  ELECTRODE,  Platinum,  Classen's  Plate,  with  rod.     Diameter,  1  inch;  length  of  stem,  4  inches. 
In  ordering,  kindly  specify  thickness  of  plate  desired. 

10818.  FOIL,  Platinum. 

Style    light      medium 


Thickness,   inches .001 

Approximate  grams  per  square  inch 0.353 

(Other  thicknesses  from  tissue  to  plates  can  be  supplied  upon  short  notice.) 
FORCEPS,  with  Platinum  Tips,  see  Forceps. 
10822.  GATJZE,  Platinum. 

Mesh 

Size  of  wires,  B.  &  S.  gage. 


.002 
0.705 


45 
31 


Approximate  grams  per  square  inch 1.500 

MUFFLES,  Platinum,  any  size  or  shape  made  to  order. 
10828.  SPATULAS,  Platinum. 

No 

Length,  inches 

Approximate  weight,  grams 

10830.  SPONGE,   Platinum,  Wired,   for  hydrogen  ignition. 
10834.  SPOONS,  Platinum,  for  deflagration  in  blowpipe  analysis. 

No A 

Diameter  of  bowl,  inches % 

Depth   of   bowl,   inches %2 

Approximate  weight,  grams 0.9 

TONGS  with  Platinum  Tips,  see  Tongs,  Crucible. 


2.0 


4.2 


A 

2% 
5 


D 


4.6 


heavy 
.004 
1.411 


52 

38 

0.543 


B 
4 
8 


E 


6.5 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


411 


No.  10872. 


No.  10870. 


10838.  TRIANGLES,  Platinum,  with  flat,  solid  ends. 

For  crucible,  cc ; 10            15            20            30  40 

Length  of  side,  inches 1%          1%          1%          2%  2% 

Size  of  wire,  inches 045         .045         .055         .055  .064 

Approximate  weight,  grams 5              8             11            12  15 

10842.  TRIANGLES,  Platinum,  for  use  in  Holder  No.  13950,  made  of  heavy  wire. 

For  crucible,  cc 10           "l5            20            30  40 

Size  of  wire,  inches 047         .047         .050         .050  .062 

Approximate    weight,   grams 2.0           2.5           4.5           5.0  7.5 

TRIANGLE  HOLDER  for  No.  10842,  see  No.  13950. 

WEIGHTS.  Platinum,  see  general  heading  Balances  and  Weights. 

10816.  PLATINUM  WIRE. 

B.  &  8.  gage 18       20       22       23       24      25       26       27       28       29       30       32       34  36 

Grams  per  foot..    5.37    3.41    2.08    1.76    1.33    1.08    0.85    0.65    0.56    0.41    0.33    0.21    0.14  0.09 
HOLDER  for  Platinum  Wire,  see  No.  7990. 

10856.    FLIERS,  flat  nose. 

Length,  inches 5  6 

Each $0-70  .80 

10858.    PLIERS,  round  nose. 

Length,  inches 5  6 

Each 25  .40 

10862.    PLIERS,  Combination.     Gas  plier,  wire  cutter,  wrench  and  screw  driver  combined.     Drop  forged 

from  high  grade  tool  steel  and  warranted  free  from  defects.  Nickel-plated.  A  very  useful  tool. 

Length,  inches 6  10 

Each .50  .90 

10864.    PLIERS,  Combination.     A  flat  nose  gas  plier  and  wire  cutter  combined.     Open  throat,  parallel 

jaws,  full  nickel-plated.     Length,  5%  inches 1.75 


10866. 

loses. 


10870. 
10872. 


PLIERS,  Gas,  cast  steel,  fine  quality.     Length,  9  inches. 

PLIERS,  Nippers,  Diagonal  Cutting,  convenient  for  cutting  in  places  difficult  of  access. 

Length,  inches 5 

Each 1.50 

PLIERS,  Nippers,  End  Cutting,  6-inch. 


.70 

6 

2.00 
•60 

PLIERS,  Nippers,  End  Cutting,  Bernard's,  6-inch,  open  throat  jaws,  nickel-plated,  interchange- 
able parts.     Its  compound  system  of  leverage  makes  this  tool  a  very  powerful  cutter. .       3.00 


412 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  10894. 


No.  10884. 


No.  10886. 


10874. 
10876. 
10878. 


10884. 
10886. 


Open  throat,  parallel  jaws,  nickel-plated. 


6 
1.70 


2.25 

6 

.90 
.15 


10892. 
10894. 

10895. 
10896. 

10897. 
10898. 


FLIERS,  Wire  Cutting.    Flat  nose,  side  cutting  pliers. 

Length,  inches 

Each   $1.30 

PLIERS,  Wire  Cutting,  Bernard's. 

Length,  inches 

Each 

PLIERS,  Wire  Cutting,  Button's  patent. 

Length,  inches 4% 

Each 70 

PLUMB  BOB,  Iron,  japanned,  weight,  9  ounces 

PLUMB  BOB,  Mercury.  Made  from  solid  steel  rod,  bored  out  and  filled  with  mercury,  which 
makes  it  unusually  heavy  in  proportion'  to  its  size,  and  the  center  of  gravity  low.  The  small 
diameter  allows  it  to  be  used  close  to  corners  and  walls.  The  point  is  hardened  and  the  body 
and  point  ground.  Nickel-plated  and  furnished  with  a  braided  silk  line.  Size,  4x%  inches; 

weight,  2%  ounces 1.00 

PNEUMATIC  TROUGHS,  see  Troughs,  Pneumatic. 
For  Polariscopes  and  Accessories,  write  for  special  information. 
POLICEMEN,  see  Rubber  Policemen. 

POLISHING  HEAD.  Japanned  iron  frame;  steel  spindle  %  of  an  inch  in  diameter  and  8  inches 
long;  adjustable  boxes.  Carefully  threaded  taper  screw  on  one  end  and  three-jawed  chuck  for 
0  to  %o-inch  drills  on  the  other.  Fitted  to  hold  emery  wheels,  circular  saws,  buffers,  etc., 
which  have  %-inch  hole  and  are  not  over  %-inch  in  thickness.  Height,  7  inches.  Pulley  -will 

take  %2-inch  round  or  %-inch  flat  belt.     Net  weight,  2-%  Ibs 2.50 

POLISHING  HEAD.  Japanned  iron  frame;  steel  spindle  %-inch  in  diameter  and  10  inches 
long;  adjustable  boxes.  Carefully  threaded  taper  screw  on  one  end  and  three-jawed  chuck  for 
0  to  J/4-inch  drills  on  the  other.  Fitted  to  hold  emery  wheels,  circular  saws,  buffers,  etc., 
which  have  %-inch  hole  and  are  not  over  %-inch  in  thickness.  Height,  7  inches.  Pulley 

will  take  %2-inch  round  or  %-inch  flat  belt.     Net  weight,  4*4  Ibs 4.00 

ACCESSORIES  FOR  NOS.  10892-4  POLISHING  HEADS. 

CIRCULAR  SAWS,  good  quality  steel,  2%  inches  in  diameter.      No A 

Size  hole,  inches. . .\ % 

For  Polishing  Head  No 10892 

Each 40 

EMERY  WHEELS,  fine  quality,  3  inches  in  diameter,  %-inch  thick.    No.  A 

Size  hole,  inches.  . % 

For  Polishing  Head  No 10892 

Each   70 

FELT  POLISHING  WHEEL,  fine  quality  felt,  5  inches  in  diameter,  1-inch  wide,  %-inch  hole. 

Fits  screw  end  of  either  No.  10892  or  No.  10894  Polishing  Head 4.10 

MUSLIN  BUFF  WHEELS.     35  pieces  heavy  muslin,   strongly  attached  together;    3  inches  in 

diameter.     No A 

Size  hole,  inches % 

For  Polishing  Head  No 10892 

Each   .  30 


B 

% 

10894 
.55 
B 

% 

10894 
.70 


B 

108~94 
.30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


413 


No.  10924. 


No.  10926. 


No.  10928. 


No.  10932. 


10902. 
10904. 
10905. 
10906. 


10910, 
10911, 
10914. 


10916. 

10918. 

3131. 

10922. 

10924. 

10926. 

10928. 

10932, 


POLISHING  HEADS,  Electric,  for  either  A.  C.  or  D.  C.  Will  meet  all  requirements  for  light 
grinding,  buffing,  etc.  Motor  enclosed,  protecting  all  working  parts  from  flying  dust  and  dirt. 
Bearings  are  made  of  extra  heavy  phosphor  bronze,  steel  shaft  *£-inch  in  diameter.  Lubrica- 
tion is  automatic  by  means  of  feed  wick  oil  cups.  Motor  practically  noiseless  in  operation. 
Has  a  speed  of  3,000  r.  p.  m.  and  will  develop  i/6  h.  p.  Dimensions:  height  over  all,  9Ms  inches; 
base,  6x5  inches;  length  of  shaft,  9VS  inches.  Finished  in  black  japan.  Buffing  attachment  to 
hold  small  buffs  for  buffing  wheel  may  be  had.  (See  No.  10905.)  Has  emery  wheel  5  inches 
in  diameter,  %-inch  face,  indicating  snap  switch,  attachment  plug  and  six  feet  reinforced  cord. 

No A  B  C  D 

A.  C.  D.  C. 

For  volts   110  220  110  220 

POLISHING  HEADS,  with  adjustable  tool  rest $48.00  48.00  36.00  36.00 

POLISHING  HEADS,  without  tool  rest 43.50  43.50  31.50  31.50 

BUFFING  ATTACHMENT,  for  either  of  the  above  Electric  Polishing  Heads 2.50 

PULLEY,  2^  inches  in  diameter,  for  %0-ineh  round  belt,  for  attaching  to  shaft  of  Nos.  10902 

and  10904 1.00 

^OBCELAIN  WARE,  see  specific  headings,  Capsules,  Crucibles,  Dishes,  Mortars,  etc. 

POTASH  BULBS 

POTASH  BULB.  Bender  &  Holbein,  with   aluminum  base 2.75 

POTASH  BULB,  Bender  &  Holbein,  glass   parts   only 2.50 

POTASH  BULBS,  Bowen.     No ." A  B 

Size   small        large 

Each    2.50  3.00 

POTASH  BULB.  Geissler 1.50 

POTASH  BULB,  Geissler,  with  drying  tube  ground  on 2.00 

POTASH  BULB.  Johnson,  as  used  in  Combustion  Apparatus  No.  3120 1.00 

POTASH  BULB.  Liebig,  with  five  bulbs 50 

POTASH  BULB.  Liebig-Dittmar,  with   trap   80 

POTASH  BULB,  Mitscherlich 50 

POTASH  BULB,  Norris,  as  used  in  determining  sulphur  in  iron  and  steel •'    .60 

POTASH  BULB,  Peligot,  with  three  bulbs 40 

POTASH  BULB,  Vanier,  see  Absorption  Tubes. 


414 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  10936.  No.  10938. 


No.  10962. 


No.  10984.      No.  10986. 


No.  10990. 


No.  F2217. 


10936.  POTASH  BULB,  Wetzel-Geissler,   with    drying  tube  attached  by  rubber  tubing...  $2.50 

10938.  POTASH  BULBS,  Winkler,  spiral  form.       No A  B 

Height,  mm 100  180 

Bach    2.00          2.50 

10942.  POTASH  BULB,  Zahradink,  with  drying  tube  ground  on.    Convenient  to  use  as  it  stands  easily 

on  its  own  base 3.00 

For  other  POTASH  BULBS,  see  Absorption  Bulbs  and  Tubes. 
POTASH  BULB  SUPPORTS,  see  Supports. 
10946.  POTATO  CUTTER,  Ravenel,  for  cutting  potato  cylinders  18  mm  in  diameter  and  halving  them 

at  the  same  time 2.00 

PRECIPITATING  JARS,  see  Jars. 
PRESS,  Filter,  see  Filter  Press. 

2400.     PRESS,  Pellet,  for  use  in  calorimetric  determinations  for  briquetting  powdered  fuels....    20.00 
10962.  PRESSES,  Tincture,  extra  heavy,  for  making  tinctures,  extracts,  etc. 

Capacity,  quarts 1  2  4  8 

Each   2.00          2.50          4.00          6.00 

PRISMS,  see  Catalog  F  of  Physical  Apparatus. 
PROJECTION  APPARATUS,  see  Catalog  F  of  Physical  Apparatus. 
PROOFING  CABINETS,  see  Flour  Testing  Apparatus. 
PSYCHROMETERS,  see  Hygrometers. 

F2217.  PULSE  or  PALM  GLASS,  Franklin's.  Two  glass  bulbs  with  connecting  tube,  containing  water 
and  water  vapor.  When  one  bulb  is  held  in  the  hand,  the  warmth  of  the  hand  is  sufficient 
to  cause  rapid  evaporation  of  the  water,  thus  causing  sufficient  pressure  to  force  the  liquid  into 

the  other  bulb,  where  a  rapid  boiling  occurs.     About  18  em  long .65 

PUMPS,  Acid,  see  Acid  Pumps. 

PUMPS,  Air,  Blowers,  see  general  heading  Blowers. 

PUMPS,  Air,  Filter,  see  Filter  Pumps. 

AIR  PUMPS,  COMPRESSION  AND  VACUUM 

10980.  PUMP,  AIR,  Compression.     A  so-called  hand  bicycle  pump  13.5  cm  long  by  2  cm  in  diameter     .50 

10984.  PUMP,  AIR,  Vacuum  and  Pressure.     Cylinder  is  of  heavy  brass,  nickel-plated,  40  cm  long  by 

54  mm  in  diameter.     A  vacuum  to  29]/^  in.  may  be  obtained  by  use  of  this  pump.     Mounted  on 

an  oak  base 15.00 

10986.  PUMP,  AIR,  Vacuum  and  Pressure.     Useful  in  elementary  work  in  the  laboratory  and  where  only 

a  partial  vacuum  is  desired.     Cylinder  is  of  brass,  28  cm  long  by  2.5  cm  in  diameter.     Mounted 
on  stirrup  for  ease  in  using 4.50 

10987.  EXTRA  VALVE  for  No.  10986  Air  Pump 05 

For  PUMP  PLATES,  see  page  416. 

10990.  AIR  TANK,  for  use  especially  with  Nos.  10984  or  10986  Air  Pumps.  A  12  liter  air  tank  with  a 
30  Ib.  pressure  gage  mounted  on  a  nicely  finished  hardwood  base.  For  convenience  in  mov- 
ing from  place  to  place  the  support  is  provided  with  a  handle  and  an  air  drying  tube  is  mounted 
on  one  of  the  uprights  as  shown  in  the  illustration.  This  apparatus  may  be  used  where  air  un- 
(lor  pressure  is  needed,  e.  g.,  for  driving  stirrers  in  chemical  laboratories.  With  stopcock  at  both 
air  inlet  and  air  outlet  and  with  rubber  tube  for  connection  with  Nos.  10984  or  10986. .  20.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


415 


PC- 


Vertical  Section. 


No.  11000. 


Horizontal  Section 
through  Gears. 


No.  11002-3. 

PUMPS,  CENCO-NELSON  HIGH  VACUUM.  These  pumps  represent  the  most  recent  development 
in  High  Vacuum  Pumps  for  laboratory  and  commercial  purposes.  They  are  compact,  operate  with  very 
small  expenditure  of  power,  require  no  attention  when  in  operation  and  should  last  indefinitely.  They 
measure  about  seven  inches  high  by  five  inches  in  diameter  at  the  base  and  weigh  approximately  ten 
pounds.  The  pulley  is  grooved  for  >4-inch  round  belt. 

Cenco-Xelson  Pumps  consist  essentially  of  rotating  gears,  in  pairs,  running  in  accurately  fitting 
housings.  The  whole  mechanism  is  immersed  in  a  cistern  of  oil,  which  serves  the  double  purpose  of  seal- 
ing all  the  joints  air-tight,  and  of  lubricating  the  moving  parts. 

The  pumps  are  made  with  either  two  or  three  pairs  of  gears  and  are  known  as  the  two-stage  and 
three-stage  pumps  respectively. 

The  Two-stage  Pump  contains  two  pairs  of  gears,  arranged  one  above  the  other.  The  upper  pair 
takes  the  air  from  the  inlet  tube  and  delivers  it  to  the  lower  pair,  which  forces  it  out  through  the 
exhaust.  The  Three-stage  Pump  contains  three  pairs  of  gears  arranged  in  the  same  way.  The  Three- 
stage  Pump  is  capable  of  producing  a  higher  vacuum  than  the  Two-stage  one. 

When  operating  for  any  length  of  time,  these  pumps  will  become  warm.  As  this  raises  the  vapor 
tension  of  the  oil,  it  is  objectionable  when  a  high  vacuum  is  desired.  To  offset  this  effect,  a  cooling 
system  is  provided  on  the  Three-stage  Pump  by  means  of  which  the  oil  is  kept  cool  by  circulation  of 
water. 

The  most  efficient  speed  of  operation  is  between  800  and  900  r.  p.  m.  At  this  speed  the  pumps  give 
just  as  good  results  as  when  operated  faster,  and  develop  less  heat. 

For  driving  these  pumps,  a  constant  speed  type  of  motor  is  most  satisfactory;  if  for  D.  C.,  a  shunt 
wound  motor,  or  if  for  A.  C.,  an  induction  motor.  If  a  series  wound  (variable  speed)  motor  is  used, 
the  speed  of  the  motor  will  decrease  as  the  vacuum  rises,  and  the  operator  has  no  control  over  the  speed, 
unless  a  rheostat  is  used  in  connection  with  the  motor.  A  motor  of  %  horse  power  should  be  used  for 
continuous  duty. 

Under  favorable  conditions,  a  vacuum  of  0.1  mm  may  be  obtained  with  the  Two-stage  Pump.  On 
continuous  service,  some  heating  takes  place,  which  lowers  the  vacuum  somewhat.  With  the  Three- 
stage  Pump,  watei  cooled,  a  vacuum  of  .05  mm  may  be  obtained  by  using  proper  precautions. 

The  displacement  of  these  pumps  in  free  air,  according  to  tests  in  our  laboratory,  is  approximately 
285  cu.  in.  per  minute,  or  10  cu.  ft.  per  hour,  at  a  speed  of  900  r.  p.  m. 

They  will  evacuate  a  flask  of  one  liter  capacity  to  a  vacuum  of  1  mm  in  two  minutes. 

No A  B 

Number  of  stages 2  3 

Vacuum,   mm 0.1  0.05 

11000.  PUMPS,  CENCO-NELSON,  unmounted $25.00  35.00 

11001.  PUMPS,  CENCO-NELSON,  on  hardwood  base,  without  motor 30.00  40.00 

11002.  PUMPS,  CENCO-NELSON,  on  hardwood  bast  with  %  h.  p.,  110  volt  A.  C.  Motor.     60.00  70.00 

11003.  PUMPS,  CENCO-NELSON,  on  hardwood  base  with  %h.  p.,  110  volt  D.C.  Motor.     60.00  70.00 


416 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


No.  11010. 


No.  10992. 


No.  10994. 


No.  11012. 


10992.  PUMP,  AIR,  Vacuum,  Lever  Action,  with  two  valves;  polished  brass  cylinder,  56  mm  diameter, 
stroke  16.5  cm;  air  pump  plate  of  glass,  25  cm  in  diameter,  ground  plane  and  resting  in  a  cast 
iron  mold,  with  guard  plug  and  vent  screw;  base  and  pillar  of  polished  hardwood,  mahogany 
finish.  Base  25x60  em $25.00 

10994.  PTJMP,  ATE,  Vacuum,  Geryk  Design.    This  oil  sealed  pump  is  manufactured  by  us  and  has  all  the 

excellencies  of  this  well-known  design.  It  has  no  valves  in  the  usual  sense  of  the  word,  the 
pistons  working  in  oil,  which  follows  and  seals  the  inlets  and  outlets  so  that  leakage  is  impos- 
sible. The  present  model  is  finely  constructed  of  brass  and  cast  iron,  handsomely  finished,  and 
is  provided  with  a  pump  plate  of  plate  glass  25  cm  in  diameter,  cemented  in  the  base.  The 
air  opening  in  the  center  of  the  pump  plate  is  fitted  with  a  safety  plug  which  prevents  the  en- 
trance of  mercury  and  other  undesirable  substances,  while  permitting  the  free  passage  of  air, 
and  there  is  also  another  opening  at  the  side  of  the  base  for  attachment  of  pressure  gages,  etc. 
The  piston  is  48  mm  in  diameter  with  a  9  cm  stroke  and  is  operated  by  a  hand  wheel  grooved 
for  %6-in.  round  belt,  as  shown  in  the  illustration.  A  vacuum  of  0.15  mm  may  be  obtained. 
45.00 

10995.  COUNTERSHAFT,  for  use  with  No.  10994  Air  Pump  when  it  is  desired   to  use   electric  motor 

drive.  This  countershaft  is  mounted  on  No.  F197  Clamp  and  when  used  with  a  %  horse  power 
motor  of  1800  r.  p.  m.  with  a  1^-inch  pulley,  will  drive  No.  10994  at  about  55  r.  p.  m ...  7.50 

AIR  PUMP  ACCESSORIES 

11010.  AIR  PUMP  PLATE,  of  iron,  20  cm  in  diameter,  cast  in  one  piece  to  minimize  danger  of  leak- 
age. Ground  plane  and  provided  with  brass  stop  cock.  The  vent  hole  at  the  center  is  tapped 

(%6~16)  for  air  pump  accessories  and  provided  with  guard  plug  (No.  F1941) 5.00 

11012.    AIR  PUMP  PLATE,  of  heavy  plate  glass,  25  cm  in  diameter;  ground  plane  and  firmly  cemented 
in  a  low  form  tripod  base  of  iron.     The  base  is  cast  in  one  piece  to  minimize  danger  of  leak- 
age and  provided  with  brass  stopcock  and  brass  connecting  tube  with  oil-sealed  taps  for  inlet 
of  air  and  for  manometer.     Finest  workmanship  throughout.     The  vent  hole  at  the  center  is 
tapped  (%6"16)  f°r  a'r  pump  accessories  and  provided  with  a  guard  plug  (No.  F1941) . .     12.00 
For  PRESSURE  TUBING,  see  general  heading,  Rubber  Tubing. 
11020,    OIL,  Pump.     Especially  adapted  for  lubricating  air  pump   cylinders  and   for  use  in  oil  sealed 

pumps  such  as  No.  10994 Per  half -pint  can         .30 

11022.  OIL,  Pump.  Especially  adapted  for  use  in  the  Cenco-Nelson  High  Vacuum  Pumps.  In  metal 
cans. 

No A  B  C  1) 

Size 1  pt.          1  qt.          1  gal.         5  gal. 

Per  can 25  .35  1.25  5.00 

11028.  VACUUM  WAX.  The  best  preparation  on  the  market  for  using  on  apparatus  in  connection  with 
the  Air  Pump,  especially  where  high  vacua  are  desired.  Will  not  injure  the  pump  plate  or  ap- 
paratus. Will  not  harden  and  can  therefore  be  easily  removed.  Superior  to  vaseline,  tallow 
or  heavy  oil > Per  4  oz.  jar  .30 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  a  A. 


417 


No.  11040. 


No.  11044. 


No.  11048. 


No.  11054. 


11032.  PUMP,  Little  Giant  Lift,  and  Force,  for  keeping  the  laboratory  plumbing  clean.  Will  clean  and 
open  any  clogged  waste  pipe  without  removing  connections.  Works  by  vacuum  and  pressure, 
and  will  break  up  any  solid  waste  or  obstruction  caused  by  chemical  action  in  a  few  minutes. 
The  pump  is  made  of  heavy  brass  with  attachments  of  pure  rubber.  The  cup  is  of  steel,  is 
non-collapsible  and  is  of  sufficient  size  to  permit  its  use  over  4-inch  screen  drains.  An  adjust- 
able washer  is  furnished  for  use  where  the  other  cup  will  not  fit 86.00 

11040.    PUNCHES,  hollow  cast  steel. 

Hole  diameter,  inches %  %  %  % 

Each 15  .20  .30  .35 

11042.    PUNCH,  spring,  cast  steel,  double  joint;  for  leather,  etc.     Length,  714  inches .50 

11044.    PUNCH,  Paper,  Samson,     The  most  powerful  hand  punch  made;  will  perforate  anything  from 

a  thin  sheet  of  steel  to  ^4-inch  paper.     Nickel-plated  and  fitted  with  $i6-ineh  die 2.50 

PURINOMETER,  see  Urine  Analysis  Apparatus. 

11048.  PYCNOMZTEB.  Drushel,  as  used  by  the  Bureau  of  Mines  for  measuring  the  specific  gravity 
of  small  quantities  of  light  petroleum  distillates.  (See  Bulletin  125  of  the  United  States 

Bureau  of  Mines) 1-00 

For  other  PYCNOMETERS,  see  Specific  Gravity  Bottles. 


PYROMETERS 

11054.  PYROMETERS.  Brown  Expansion,  operating  through  the  difference  in  expansion  of  graphite 
rods  and  the  steel  stem  enclosing  them.  A  compensating  device  corrects  for  differences  in  the 
amount  of  stem  immersed  above  12  inches.  The  graduated  dial  is  of  porcelain,  6%  inches  in 
diameter,  and  is  not  affected  by  heat  or  gases.  Furnished  with  a  36-inch  stem  which  should 
be  inserted  in  the  heat  up  to  12  inches  or  more. 

No          A  B  C 

Graduated  to,  degrees  F 800  1200          1500 

Each    16.50        22.00        27.50 

Note: — Pyrometers  No.  11054  can  be  furnished  with  dial  graduated  in  corresponding  Centigrade 
ranges  "if  desired  without  additional  charge.  They  may  also  be  obtained  with  dial  set  for 
horizontal  use  of  stem. 

11058.  PYROMETERS,  Brown  High  Resistance,  Portable  Type,  for  use  with  either  base  metal  or  plati- 
num thermo-couples.  The  scale  is  5  inches  long  with  mirror  for  accurate  reading.  A  locking 
device  is  provided  which  automatically  locks  the  pointer  when  the  case  is  closed,  preventing 
damage  in  handling  or  shipment.  The  instrument  has  a  resistance  of  600  ohms  and  its  read- 
ings are  independent  of  the  length  of  lead  wires.  Complete  with  15  feet  double-conductor 
\vire.  in  polished  hardwood  case  with  hinged  cover,  without  thermo-couple. 

No  A  B  C  D  E  F  G  H  J 

Bange   0  to  de°rees  F.    800          1000       1200        1600        1800        2000        2400        2600        3000 
Graduated  to.  deg.  F.      5  10  10  10  20  20  20  20  25 

Each    82.50       82.50       82.50      82.50      82.50       82.50       82.50       82.50      82.50 

(For  illustration  of  No.  11058,  see  next  page.) 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


EiEGTfUC  PYROMETER 
THE  BROWN  UlSTBUMEtfr 


Nos.  11058-64. 


Nos.  11072-4. 


Nos.  11068-70. 

11060.  PYROMETERS,  Brown  High  Resistance,  Portable  Type,  same  as  No.  11058,  but  with  scale  gradu- 
ated in  Centigrade  degrees. 

No .-.         A  B  C  D  E  F 

Range,  0  to  degrees  C 400          600          800        1000        1200        1600 

Graduated  to,  degrees  C 5  5  5  10  10  10 

Each    $82.50       82.50       82.50       82.50       82.50       82.50 

11062.  PYROMETERS,  Brown  Low  Resistance,  Portable  Type,  same  as  No.  11058,  but  with  resistance 
of  only  5  ohms,  for  use  with  base  metal  thermo-couples  only. 

No A  B  C  D  E 

Range,  0  to  degrees  F 800         1000        1200        1600        1800 

Graduated   to,   degrees  F 5  10  10  10  20 

Each    55.00       55.00       55.00       55.00       55.00 

11064.  PYROMETERS,  Brown  Low  Resistance,  Portable  Type,  sanu>  as  No.  11062,  but  with  scale  gradu- 
ated in  Centigrade  degrees. 

No A  B  C  D 

Range,  0  to  degrees  C 400          600          800         1000 

Graduated  to,  degrees  C 5  5  5  10 

Each    55.00      55.00      55.00      55.00 

11068.  PYROMETERS,  Brown  High  Resistance,  Permanent  Type,  for  wall  use,  with  high  resistance, 
which  renders  its  readings  independent  of  the  length  or  temperature  of  the  connecting  wires. 
For  use  with  either  base  metal  or  platinum  thermo-couples.  Resistance  with  base  metal 
thermo-couples,  600  to  1000  ohms. 

B  CDEFGH  J 

1000       1200        1600        1800        2000        2400        2600        3000 

10  10  10  20  20  20  20  25 

82.50       82.50       82.50       82.50       82.50       82.50       82.50       82.50 


No A 

Range,  0  to  degrees  F.    800 
Graduated  to,  deg.  F.      5 
Each    82.50 


11070.  PYROMETERS.  Brown  High  Resistance,  Permanent   Type,   same   as   No.   11068,   but   with  scale 
graduated  in  Centigrade  degrees. 

No A             B             C             D             E  F 

Range,  0  to  degrees  C 400          600          800        1000        1200  1600 

Graduated  to,  degrees  C 5              5              5             10            10  10 

Each    82.50       82.50       82.50       82.50       82.50  82.50 

11072.  PYROMETERS,  Brown  Low  Resistance,  Permanent   Type,    for   wall    use,   with   resistance  of   5 
ohms,  for  use  with  base  metal  thermo-couples  only.     Length  of  scale,  6  inches. 

No A             B             C             D  E 

Range,  0  to  degrees  F 800         1000        1200        1600  1800 

Graduated  to,  degrees  F 5             10            10            10  20 

Each    55.00       55.00       55.00       55.00  55.00 

Note: — A  smaller  instrument  with  4%  inch  scale  can  be  supplied  if  desired  at  $5.00  less. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


419 


Nos.  11086-7. 


11074.  PYROMETERS,  Brown  Low  Resistance,  Permanent  Type,   same  as  No.   11072,  but  with  scale 

graduated  in  Centigrade  degrees. 

No A  B  C  D 

Bange,  0  to  degrees  C 400          600          800         1000 

Graduated  to,  degrees  C 5  5  5  10 

Each    $55.00       55.00       55.00       55.00 

See  note  under  11072. 

11075.  PYROMETERS,  Brown  High  Resistance.  Recording   Type,   for   use   with   either   base   metal   or 

platinum  thermo-couples.     Complete  with  8-day  clock,  100  twenty-four  hour  parchment  charts 

and  50  feet  double-conductor  wire,  but  without  thermo-couple. 

No A  B  C  D  E  P  G 

Bange,  75  to,  degrees  F 800        1200        1600        2000        2400        3000        3600 

Graduated  to,  degrees  F 20  25  25  50  50  50  20 

Each    137.50     137.50     137.50     137.50     137.50     137.50     137.50 

11080.  PYROMETERS,  Brown  High  Resistance,  Recording   Type,   same   as   No.    11078  but  with   scale 

graduated  in  degrees  Centigrade. 

No \  B  C  D  E  F 

Bange,  25  to,  degrees  C 400          600          800        1000        1200        1600 

Graduated  to,  degrees  C 5  10  10  20  25  25 

Each    i 137.50     137.50     137.50     137.50     137.50     137.50 

11086.  PYROMETERS,  Brown  Recording,  Continuous  Type,  for  use  where  a  continuous  record  of  the 

temperature  is  desired  over  long  periods  of  time.  An  8-day  clock  mechanism  operates  the 
record  roll,  over  which  passes  a  two  months'  roll  of  carbon  paper.  A  pointer  strikes  the  car- 
bon band  once  a  minute  and  produces  the  record.  No  ink  is  required.  Complete  with  one  roll 
of  carbon  and  one  of  record  paper,  and  with  50  feet  of  double  conductor  wire. 

Xo A  B  C  D 

Bange,  75  to,  degrees  F 800         1200        2000        3000 

Graduated  to,  degrees  F 5  10  ?.">  50 

Each    220.00    220.00    220.00    220.00 

11087.  PYROMETERS.  Brown  Recording,  Continuous  Type,  same  as  No.  11086,  but  with  chart  gradu- 

ated in  degrees  C. 

No A  B  C 

Bange.  25  to,  degrees  C 800         1200        1600 

Graduated  to,  degrees  C 10  10  20 

Each    220.00    220.00    220.00 

11(188.  EXTRA  CHART  ROLLS  for  Nos.  110S6-7 each      2.75 

11089.  EXTRA  CARBON  MARKING  ROLLS  for  Nos.  11086-7 each       .55 

PYROMETER,  Brown  Precision  Heatmeter,  write  for  special  information. 

PYROMETER,   Brown  Transformation  Point,  for  determining  the  recalescence  and  decalescence 

points  of  steel,  write  for  special  bulletin. 

11092.  PROTECTING  CASES,  for  Brown  Pyrometers,  Permanent  Type,  of  polished  hardwood  with 
glass  front,  with  brackets  for  fastening  to  wall.  Price  includes  mounting  of  instruments  in 
case  before  shipment,  but  not  price  of  instruments. 

No A  B 

For   Pyrometer,   tvpe high  resistance        low  resistance 

Each  ". ." 6.60  6.60 


420 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  11100. 


No.  11102. 


11093.  PROTECTING  CASES,  similar  to  No.  11092,  but  intended  to  contain  both  Pyrometer  and 
switchboard.  The  switch  handle  extends  through  the  glass  door,  and  is  provided  with  a  stuf- 
fing box  to  make  the  opening  dustproof.  As  the  contacts  wear,  the  spring  tension  can  be  tight- 
ened up  without  opening  the  case.  Price  includes  mounting  of  instruments  and  switchboard 
in  case  before  shipment,  but  not  price  of  instrument  or  switchboard. 

No A  B 

For  Pyrometer,  type high  resistance       low  resistance 

Each    $8.25  8.25 

Note: — Nos.  11092  and  11093  should  be  ordered  when  the  Pyrometer  is  ordered,  as  it  must  be 

mounted  at  the  factory. 

11096.  SWITCHBOARDS,  for  use  with  Brown  Pyrometers  where  several  thermo-couples  are  to  be  con- 
nected to  the  same  Indicating  or  Recording  Pyrometer.  This  is  a  rotary  switch  with  posi- 
tive spring  contacts,  the  tension  of  which  may  be  taken  up  as  the  contacts  wear. 

Number  of  points 2  4  6  8  12  16 

Each    6.60         7.70         8.80         9.90       12.10       14.30 

11100.  THERMO-COUPLES,  Base  Metal,  for  use  with  Nos.  11058  to  11088,  for  measuring  temperatures 
up  to  1800°F.,  and  for  intermittent  use  up  to  2000°F.  The  couple  consists  of  two  %-inch 
rods  of  nickel  alloy  welded  together  at  one  end  and  insulated  throughout  their  lengths  by 
asbestos  for  temperatures  up  to  1000°F.,  and  by  lava  above  that  temperature.  Complete  with 
head  and  binding  posts  for  attaching  lead  wires,  and  with  protecting  tube  of  steel  pipe  unless 

otherwise  specified.     With  adjustable  flange.     Length,   24  inches 8.80 

Note^ — For  lengths  above  24  inches per  foot,  add     1.10 

11102.  THERMO-COUPLES.  Platinum,  for  use  with  Nos.  11058  to  11088,  for  temperatures  up  to 
3000°F.,  or  1600°C.  The  couple  consists  of  one  wire  of  chemically  pure  platinum  and  one  of 
an  alloy  of  platinum  with  10  per  cent,  rhodium,  of  a  diameter  of  0.02  inch.  The  wires  are 
insulated  by  small  fire-clay  tubes  pierced  with  two  holes.  Complete  with  iron  head  and 
porcelain  block  with  binding  posts,  and  with  protecting  sheath  of  porcelain.  (If  specified  in 
ordering,  a  quartz  sheath  may  be  furnished  instead  of  porcelain.) 

Length,  inches   12  18  24  36 

Each    38.50      50.60      60.50      79.20 

11106.  PROTECTING  TUBES,  Graphite,  for  Thermo-Couples,  for  protection  from  molten  metals. 

Length,   inches 12  18  24  36 

Each    3.30         4.40         6.60         8.80 

11108.  PROTECTING  TUBES,  Nickel-Chromium,  for  base  metal  thermo-couples  for  use  at  tempera- 
tures between  1500°  and  2000°F.  They  may  also  be  used  in  lead  hardening  baths,  and  as  an 
additional  protection  over  porcelain  or  quartz  tubes. 

Length,    inches 12  18  24 

Each   5.50        8.80      12.10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


421 


No.  11140. 


Nos.  11130-2. 


39 

7.15 

They 

B 

1*4 

.83 


11112.  PROTECTING  TUBES,  Porcelain,  for  Platinum  Thermo-Couples,  with  a  melting  point  of  3600T. 
They  should  not  be  subjected  to  sudden  changes  of  temperature. 

Length,   inches 12  18  27  39 

Each    . $4.40        5.50        7.45      11.00 

11118.  PROTECTING  TUBES.  Quartz,  for  use  where  sudden  fluctuations  in  temperature  are  met  with, 
or  where  a  tube  with  very  small  lag  is  desired.  Melting  point,  about  2400T. 

Length,   inches '. 12  18  27 

Each 3.85        4.40        5.25 

11120.  PROTECTING  TUBES,  Steel,  for  Base  Metal  Thermo-Couples,  to  protect  from  gases,  etc. 
should  not  be  used  at  temperatures  above  1400°F.,  nor  in  an  oxidizing  atmosphere. 

No A 

Diameter   outside,   inches % 

Per   foot . ......  - 55 

11122.  PROTECTING  TUBES,  Calorized  Steel,  subjected  to  calorizing  which  increases  the  life  of  the 
steel  when  used  at  high  temperatures. 

Length,   inches 12  18  24  36 

Each    2.75         3.30         3.85         4.95 

11130.  PYROMETERS,  Hoskins  Low  Resistance,  Portable  Type,  complete  with  36-inch  thermo-couple 
of  Alumel  and  Chromel  wires,  twisted  and  welded  together.  The  special  feature  of  this  out- 
fit is  the  fact  that  the  operator  can  easily  make  his  own  thermo-couples,  when  replacement  is 
necessary.  The  Alumel  and  Chromel  wires  can  be  obtained  in  coils  of  various  gages,  so  cali- 
brated that  all  couples  made  from  two  given  coils  are  interchangeable.  The  ends  of  the  wires 
should  be  twisted  together  and  welded,  and  are  then  ready  for  use.  Complete  with  low- 
resistance  portable  indicator  in  black  enameled  aluminum  ease  6*4x6x3  inches,  weighing  5 
pounds;  36-inch  standard  thermo-couple;  and  20  feet  of  flexible  leads. 

Xo A  B 

Range.   32   to,   degrees   F 1000          1500 

Graduated  to,  degrees  F 10  20 

Each    47.00        47.00 

11132.  PYROMETERS,  Hoskins  Low  Resistance,  Portable  Type,  same  as  No.  11130,  but  with  scale 
graduated  in  Centigrade  degrees. 

No A 

Bange,  0  to,  degrees  C 550 

Graduated  to,  degrees  C 5 

Each    47.00 

11140.  PYROMETER,  Scimatco  Optical,  Patented,  for  measurements  of  temperatures  from  1200°  to 
7200°F.  With  this  instrument,  direct  observation  is  made  of  the  object  whose  temperature 
is  to  be  measured.  The  instrument  can  be  readily  standardized  by  the  operator  in  a  few 
minutes  time.  There  are  no  errors  due  to  connecting  wires,  cold  junctions,  temperature 
changes,  or  sensitive  electrical  instruments.  The  life  of  the  instrument  with  ordinary  care  is 
indefinite,  and  the  only  cost  of  upkeep  is  that  of  recharging  the  storage  battery.  Espe- 
cially suited  for  use  in  foundries,  blast  furnaces,  steel  works,  glass  factories,  smelters,  gas 
works,  brick  and  tile  factories,  porcelain  factories  and  in  research  work  on  high  tempera- 
tures. Complete  with  tripod,  storage  battery,  current  regulator,  3  extra  lamps  and  bottle  of 
amyl  acetate,  in  two  carrying  cases.  Bange,"  800°  to  2000°C 175.00 


B 

800 
10 

47.00 


C 

2000 
20 

47.00 


C 
1100 

10 
47.00 


D 

2500 
25 

47.00 


D 
1400 

20 
47.00 


41.-2 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  11154. 


Nos.  11162-5. 


11142.  PYROMETER,  Scimatco  Optical,  same  as  No.  11140,  but  with  scale  graduated  from  1400°  to 
3000°F  $175.00 

ITote: — Higher  ranges  can  be  supplied  if  desired. 

11154.  PYROMETERS,  Shore's  Pyroscope,  for  measurement  of  temperatures  by  comparison  of  the 
color  of  the  heated  object  with  that  of  a  kerosene  flame.  This  instrument  was  designed 
especially  for  the  heat  treatment  of  steel  and  for  brass  foundry  work,  but  can  be  used  for 
any  measurements  within  the  ranges  given.  The  instrument  is  self  contained  and  easily  por- 
table, requiring  no  batteries  or  electrical  connections  of  any  kind.  The  entire  operation  con- 
sists in  focusing  the  telescope  upon  the  object  whose  temperature  is  to  be  measured,  turning 
the  knob  which  operates  the  diaphragm  until  the  difference  in  color  disappears  and  then 
reading  the  temperature  from  the  graduated  drum.  Complete  with  instrument  as  described, 
and  with  small  and  large  tripods  for  mounting  at  convenient  height. 

No A  B 

Range,   degrees   F 1200-2100     2000-3000 

Each   65.00  65.00 

11162.  PYROMETERS,   Thwing  Radiation,  Portable  Type,  for  measurements  of  temperatures  of  objects 

in  furnaces,  of  objects  in  motion,  or  in  inaccessible  places,  by  means  of  the  heat  radiated 
from  the  object.  The  instrument  consists  of  a  Receiving  Tube  for  collecting  the  radiation 
and  concentrating  it  upon  a  sensitive  thermo-couple,  and  a  Galvanometer  to  measure  the  cur- 
rent thus  generated.  The  design  of  the  tube  makes  it  independent  of  the  distance  from  the 
hot  body,  provided  the  surface  is  of  sufficient  area  to  fill  the  angle  formed  by  the  opening 
in  the  tube.  The  instrument  is  very  rapid,  requiring  an  interval  of  only  5  seconds  before 
a  reading  may  be  made  after  the  tube  is  pointed  at  the  object.  Convenient  for  use  in  cement 
kilns,  open  hearth  furnaces,  carborundum  furnaces,  electric  furnaces,  brick  kilns,  lime  kilns, 
smelting  furnaces,  coke  ovens,  boiler  fire  pits,  hardening  furnaces,  etc.  It  should  not  be  used 
for  gases,  flames  or  transparent  bodies,  nor  where  there  is  much  smoke  or  flame.  Complete 
with  tube  30  inches  long  divided  in  two  sections,  portable  indicator  in  aluminum  case  with 
4-inch  scale  with  zero  adjustment,  and  with  connecting  cord. 

No A  B  C  D  E  F  G 

Range,  degrees  F...    500-1400     800-1800   1000-2500  1400-2500  1200-2800  1000-3000  1400-3500 
Each    135.00         135.00         135.00         135.00         135.00         135.00         135.00 

11163.  PYROMETERS,  Thwing  Radiation,  Portable  Type,  same  as  No.  11162,  but  with  double  scale; 

graduated  in  Fahrenheit  degrees. 


No , A  B 

Range,  degrees  F 1000-2500  600-1650 


500-1500 


D 

400-1200 


E 

600-1800 


Each 
No. 


1800-3600  1000-3000  1000-2500  800-2800  1200-3600 
145.00    145.00    145.00    145.00    145.00 
F       G 


H 


Range,   degrees  F 1000-2500    600-1600     300-1000      800-2200 

2000-4500  1200-2800  1000-3000  1500-3200 
Each    .  145.00         145.00         145.00          145.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


423 


No.  11167. 


11104.  PYROMETERS,   Thwing  Radiation,   Portable  Type,  same  as  No.  11162,  but  with  scale  graduated 

in  Centigrade  degrees.    No A  B  C 

Range,   degrees   C 600-1500 

Each    $135.00 

11105.  PYROMETERS,  Thwing  Radiation,  Portable  Type,  same  as  No.  11164,  but  with  double  scale; 

graduated  in  Centigrade  degrees. 

~  E  F 

600-1500  500-1700 
1000-2500  1500-3000 


500-1700  1000-2000 
135.00    135.00 


No. 

Range,  degrees  C... 


A 

200-800 

500-1700 

145.00 


B 

500-1400 

800-2000 

145.00 


C 

1000-2000 

1500-4000 

145.00 


D 

500-1000 

600-1500 

145.00 


G 

500-1800 
1200-3000 
Each     145.00        145.00          145.00         145.00         145.00         145.00         145.00 

11166.  CARRYING  CASE  for  Nos.  11162-11165,  with  leather  handles 10.00 

11167.  PYROMETERS,  Thwing  Radiation,  Portable  Type,  for  laboratory  use,  in  polished  mahogany 

case,  with  6-inch  scale.     Ranges  for  this  instrument  are  the  same  as  those  given  under  Nos. 

11162  to  11165. 

No A  B 

Type   single  scale  double  scale 

Each    145.00  155.00 

In  ordering,  kindly  specify  scale  and  range  desired.    See  Nos.  11162  to  11165. 

11168.  PYROMETERS,  Thwing  Radiation,  Permanent  Type,  same  as  No.  11162,  but  with  wall  type 

indicator  and  ventilated  receiving  tube  for   permanent    installation.      With    either   single    or 

double  scales,  graduated  in  Fahrenheit  or  Centigrade  degrees.     Write  for  information  as  to 

ranges  and  prices. 
Note: — Thwing  Radiation  Pyrometers  may  be  secured  with  other  ranges  than  those  listed,  and 

with  triple  range  scales  if  desired.     We  shall  be  glad  to  furnish  information  and  prices  upon 

request.     Send  for  special  bulletin  containing  full  description. 

QUARTZ   APPARATUS,   Transparent,   see  general  headings,  Crucibles,  Dishes,  Flasks,  etc. 
RACKS,  All  Bands,  see  Supports. 
RACKS,  Milk  Test  Bottle,  see  Milk  Testing  Apparatus. 

RADIO-ACTIVITY  APPARATUS 

F2758.  ELECTROSCOPE,  Box  Form.  Consists  of  a  metal  box  about  10x10x10  cm  with  removable  glass 
front  and  back.  The  brass  rod  carrying  the  strips  of  gold-foil  is  insulated  by  pure  amber,  giv- 
ing the  best  insulation  possible.  To  obviate  radio-active  influences,  a  metal  cap  is  provided  to 
fit  over  the  collar  on  top  of  the  box  and  enclose  the  projecting  rod.  This  electroscope  -will  re- 
tain its  charge  for  from  6  to  8  days 4.00 

ELECTROSCOPE,  Lind  Interchangeable,  as  used  by  the  United  States  Bureau  of  Mines.  This  in- 
strument can  be  assembled  to  suit  the  needs  of  the  operator  from  the  parts  described  below.  (See 
Bulletin  104,  United  States  Bureau  of  Mines,  Chapter  V.) 

11200.  ELECTROSCOPE  HEAD,  consisting  of  a  nickel-plated  housing  containing  the  leaf  system  and 
supporting  the  reading  microscope.  It  is  closed  in  the  front  and  rear  by  sheet  mica.  A  fine 
wire  grating  makes  contact  with  the  mica  to  ground  stray  charges.  The  leaf  system  is  insu- 
lated by  means  of  an  amberoid  plug,  fitted  into  a  threaded  cap,  by  means  of  which  the  leaf 
may  be  readily  removed.  The  aluminum  leaf  is  charged  by  means  of  a  rod  set  in  hard  rubber 
at  the  right-hand  side.  Opposite,  on  the  left,  is  a  protector  for  the  leaf  when  in  transporta- 
tion, which  should  be  withdrawn  to  full  distance  when  in  use.  At  the  bottom  of  the  leaf  sup- 
port is  a  light  spring,  to  make  electrical  contact  with  the  interchangeable  discharge  chambers. 


424 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  8.  A. 


NO.  11208. 
ELECTROSCOPE  HEAD,  Continued. 


No.  11203  with  No.  11200  mounted  on  it. 


11201. 


11202. 


11203. 
11204. 

11205. 
11206. 
11207. 

11208. 

11209. 
11210. 
11211. 


The  Microscope,  magnification,  24-fold;  focal  distance  32  mm,  is  carried  by  a  projecting  soliil 
front,  and  is  very  firmly  fixed  with  relation  to  the  leaf.  It  may  be  refocused,  however,  by 
releasing  a  split  collar  controlled  by  a  heavy  milled-head  screw.  The  microscope  has  a  gradu- 
ated and  numbered  micrometer  scale  in  the  eye-piece  by  which  the  motion  of  the  leaf  is 
measured. 

The  Head  as  a  whole  comprises  a  very  compact  readily  transportable  unit,  and  yet  one  that  can 
be  easily  taken  apart  if  it  is  desired  to  do  so.  Complete  as  described $63.00 

OPEN  DISCHARGE  CHAMBER  FOR  SOLIDS,  a  cylinder  for  use  with  Head  No.  11200,  10.5 
cm  high,  9  cm  in  diameter,  with  a  door  5  cm  high,  and  9  cm  broad.  The  plate  electrode  is 
5.5  cm  in  diameter  and  is  supported  horizontally  at  1.5  cm  below  the  tep  of  the  chamber,  by 
a  rod  that  passes  up  through  an  amberoid  insulator,  and  terminates  in  a  cap  to  fit  the  inter- 
changeable top.  The  chamber  is  provided  with  a  friction  cap  to  protect  the  insulator  when 
not  in  use 15.00 

GAS-TIGHT  EMANATION  CHAMBER,  for  use  with  Head  No.  11200,  10.5  cm  high,  9  cm  in 
diameter,  provided  with  two  special  gas-tight  stop-cocks.  Volume,  about  %  liter.  The  am- 
beroid insulation  is  made  gas-tight  by  a  special  mechanical  joint  without  any  wax  or  other 
binding  material.  Since  each  emanation  chapiber  can  be  used  only  once  daily,  as  many  dupli- 
cates must  be  provided  as  it  is  desired  to  make  daily  determinations,  all  being  used  with  one 
top.  At  least  one  extra  Charging  Cap  No.  11210  is  needed  with  more  than  one  chamber.  18.75 

LIGHT  WALLED  WATER  CHAMBER,  height,  13  inches;  diameter,  10  inches;  weight,  4 
pounds;  capacity,  about  4  gallons.  Intended  especially  for  field  use  with  Head  No.  11200, 
where  water  is  introduced  directly  into  the  chambers.  Amberoid  insulation,  stop-cock  outlet 
above,  and  large  opening  below,  with  rubber  stopper  for  introduction  of  water 15.00 

HEAVY  WALLED  WATER  CHAMBER,  for  use  with  Head  No.  11200.  Height,  13  inches; 
diameter,  10  inches;  weight,  13  pounds;  capacity,  about  4  gallons.  Intended  for  laboratory 
use,  the  walls  being  rigid  enough  to  support  a  complete  vacuum  for  the  boiling-off  method. 
Water  can  also  be  introduced  directly  if  desired.  Price  quoted  upon  application. 

PLATE  FOR  SOLIDS,  5.5  cm  in  diameter  with  narrow  rim  2  mm  deep,  to  be  used  with  No. 
11201.  At  least  two,  and  probably  more,  are  desirable each  1.25 

CHARGING  ROD,  a  tapering  rod  of  hard  rubber  8  inches  long,  for  charging  in  field  work  and 
where  battery  is  not  available -50 

BATTERY  SET,  consisting  of  dry  cells  connected  in  series,  in  covered  wooden  box,  with  insu- 
lated wire  to  guard  one  end  of  battery,  charging  wire  with  floating  terminal  and  knife 
switch  to  protect  whole.  Dimensions  of  box,  18x15x6  inches 43.00 

GAS  BURETTES  FOR  EMANATION,  a  glass  burette  with  one  capillary  two-way  stop-cock 
above  and  one  wide-bore  cock  below.  Length  of  burette,  60  cm;  diameter,  3  cm;  length  over 
all,  80  cm.  Two  are  desirable  for  rapid  work each  10.00 

MICRO-DRYING  BULBS  for  Sulphuric  Acid,  to  be  used  between  Nos.  11202  and  11208  in 
transferring  gases.  One  is  needed  for  each  gas  burette ••  1-50 

CHARGING  CAP,  of  hard  rubber  with  binding  post,  to  be  used  in  maintaining  charge  on  No. 
11202  when  Head  No.  11200  is  in  use 1.50 

HAND  PUMP,  Vacuum  or  Pressure,  of  special  construction  for  use  in  evacuating  No.  11202 
Chamber  . 10.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A.  425 


No.  11244. 

11212.  WRENCH  for  removing  electrode  collars  from  Chambers  Xos.  11201  to  11204 $1.10 

0036.     ALUMINUM  Foil,  in  books  of  25  leaves,  5x5  inches per  book  .45 

11214.  WOODEN  SUPPORT  for  No.  11200,  when  not  on  chamber 3.00 

11215.  WOODEN  CASE  for  Field  Sets  Xos.  11224,  11230,  11232  and  11234 8.00 

12962.  STOP  WATCH,  7  jewelled. 12.50 

11217.  ANALYZED  LE  DOUX  PITCH  BLEND  (about  60%  TJ3  08),  with  Radium  data,  to  be  used  in 

calibrating  Chambers  No.  11202  directly  in  terms  of  radium  emanation,  by  the  solution   and 
boiling  method.  Enough  for  50  calibrations 4.00 

11218.  ANALYZED  DE  DOUX  CARNOTITE  (about  1.5%  U3  08),  to  be  used  in  No.  11205  Plates  in 

Chamber  Xo.  11201  for  solid  comparison per  25  grains       1.50 

11219.  ANALYZED  LE  DOUX  CARNOTTTE  (about  2%  TT3  08) per  25  grams       2.00 

11220.  ANALYZED  LE  DOUX  CARNOTITE  (about  3f"c  TT3  08) per  25  grams      3.00 

RECOMMENDED  SETS. 

11224.  COMPLETE  FIELD  OUTFIT  for  Ores,  consisting  of  one  each  Xos.  11200,  11201,  11206,  11212, 
6036,  11218,  11219,  11220,  11215,  12962,  and  two  No.  11205 105.75 

11226.  COMPLETE  LABORATORY  OUTFIT  for  Solids,  Gases  (Emanation  Method)  and  Liquids 
(Water),  consisting  of  one  each  Xos.  11200,  11201, 11206, 11207,  11211,  11212,  6036, 11214, 11217, 
11218,  11219,  11220,  and  two  each  Nos.  11202,  11205,  11208,  11209  and  11210 182.50 

11228.  SIMPLE  LABORATORY  OUTFIT  for  Solids,  Gases  and  Liquids,  without  battery  set,  pump, 
water  chamber,  and  stop  watch,  consisting  of  one  each  Xos.  11200,  11201,  11202,  11206,  11208, 
11209,  11210,  11212,  6036,  11214,  11217  and  11219 126.75 

11230.  COMPLETE  LABORATORY  AND  FIELD  OUTFIT  for  Water  Analysis,  consisting  of  one  each 
Xos.  11200, 11203,  11206,  11208,  11209,  11210,  11211,  11212,  6036,  11214,  11215,  11217  and  11219 
i 120.00 

11232.  SIMPLE  LABORATORY  AND  FIELD  OUTFIT  for  Water  Analysis,  consisting  of  one  each  Xos. 
11200,  11203,  11204,  11206,  11212,  6036,  11215  and  11217 110.00 

11234.  SIMPLE  FIELD  OUTFIT  for  Water  Analysis,  consisting  of  one  each  Nos.  11200,  11203,  11206, 
11212,  6036,  11215,  12962  and  11217 100.00 

11244.  ELECTROSCOPE,  land  Gamma  Ray,  as  used  by  the  United  States  Bureau  of  Mines.  This  is  a 
single  unit  outfit,  not  interchangeable,  consisting  of  a  nickel-plated  brass  cylinder  13  cm  high 
and  9  cm  in  diameter,  with  lead  lining  inside  3  mm  thick.  The  leaf  system  is  in  the  discharge 
chamber  itself,  into  which  is  also  fixed,  by  means  of  a  split  collar  with  heavy  screw,  the  reading 
microscope  with  numbered  scale.  The  chamber  is  mounted  on  one  end  of  a  wooden  base  33  x  6 
inches,  along  which  extends  a  nickel-plated  track  27  inches  long  on  which  a  light  carriage  sup- 
port for  the  radium  tube  may  be  fixed  by  a  binding  screw  at  any  desired  distance  from  the 
discharge  chamber.  The  carriage  supports  the  radium  tube  horizontally  at  a  height  just  oppo- 
site the  middle  of  the  chamber.  The  radium  tube  is  held  by  a  light  spring  clip  against  a  con- 
cave bar,  graduated  in  l^e  inch  divisions,  to  facilitate  centering  the  tube  and  determining  its 
length.  A  removable  lead  screen  6  x  6  x  ^4  inches  is  placed  immediately  against,  the  discharge 
chamber,  to  shield  it  from  the  radium  tube.  Complete  as  described.  (See  Bulletin  104,  of  the 
United  States  Bureau  of  Mines,  Chapter  V) 80.00 

11246.  ELECTROSCOPE,  Gamma  Ray  Outfit,  for  the  measurement  of  tubes  of  radium  or  of  emanation, 
suitable  for  use  by  physicians  and  hospitals,  consisting  of  Gamma  Ray  Electroscojft?  No.  11244, 
Stop  "Watch  No.  12962  'and  Charging  Rod  Xo.  11206 ". 95.00 

MINERALS  FOR  RADIO-ACTIVITY 

11250.  CALC-SPAR,  in  pieces  about  40  x  15  x  6  mm per  piece        .75 

11251.  CARNOTITE   (Radium  Ore).     High  grade  specimens. 

Xo A  B  C 

Size Small.         Medium.         Large. 

Each    .75  1.50  2.25 

11252.  FLUORSPAR  CUBES,  approximately  13  mm  on  a  side per  cube       1.50 

11253.  KUNZITE,  fluorescent per  6  grams       1.50 

11255.  THORIUM  NITRATE per  ounce      1.10 


426 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  11280. 


No.  11284. 


No.  F2177.     No.  11300. 


No.  11304. 


No.  11308. 


11253.  URANIUM  NITRATE per  ounce  $0.60 

11259.  URANIUM  OXIDE  (yellow) per  ounce  .50 

11261.  WILLEMITE,  Flourescent , per  ounce  .75 

11262.  WILLEMITE,  Phosphorescent per  ounce  1.50 

11264.  ZINC  SULPHIDE,  PHOSPHORESCENT,  extra  strong  phosphorescence;  produces  very  large  scin- 

tillations with  radium.     In  vials  of  5  grams Per  vial       2.00 

11265.  ZINC  SULPHIDE,  PHOSPHORESCENT,  strong  phosphorescence.     In  vials  of  5  grams. 

Per  vial      1.00 

11266.  ZINC  SULPHIDE,  TRIBOLUMINESCENT.     Shows  a  markea  luminosity  when  rubbed;  is  also 

phosphorescent.     In  vials  of  5  grams Per  vial       2.00 

11268.  FLUORESCENT  SCREEN,  65  x  45  mm 1.60 

11280.  RADIOSCOPE,  for  detecting  the  presence  o;  radio-activity  in  waters,  ores,  etc.,  by  viewing 
scintillations  on  a  phosphorescent  screen.  These  scintillations  are  produced  by  the  alpha  par- 
ticles emitted  by  the  emanation  evolved  from  radio-active  substances.  The  instrument  con- 
sists of  a  jar  for  holding  the  substance  under  test,  provided  with  a  screw  cap  fitted  with  an 
adjustable  compound  lens  and  a  phosphorescent  zinc  sulphide  screen.  The  emanation  rises 
from  the  jar  into  the  cap  and  there  causes  scintillations  on  the  screen.  With  each  Badioscope 
is  supplied  a  quantity  of  high  grade  carnotite  (radium)  ore  which  may  be  used  to  learn  the  use 
of  the  instrument.  Size  20x7.5  cm 10.00 

11284.  SPINTHARISCOPE,  for  showing  the  radiant  energy  of  radium  salt.  Consists  of  a  nickel-plated 
metal  tube,  19x35  mm,  with  a  phosphorescent  screen  at  one  end  and  a  high  grade  lens  at  the 
other.  Projecting  from  the  center  of  the  phosphorescent  screen  is  a  pin  on  the  side  of  which 
has  been  placed  a  small  quantity  of  radium  salt.  With  this  instrument  the  scintillations  pro- 
duced on  the  phosphorescent  screen  by  the  constantly  emanating  alpha  particles  are  shown  in 
the  most  marvelous  manner.  In  order  to  observe  this  phenomenon  in  the  day  time  the  observer 
should  remain  in  a  darkened  room  for  a  short  time,  so  that  the  eye  may  become  sufficiently 
sensitive  4.00 

F2177.  RADIOMETER,  Crookes',  illustrating  phenomena  of  radiant  heat.     Mounted  on  glass  base. . 

RAW  MATERIALS,  see  list  at  end  of  letter  W. 
RAZORS,  Section,  see  Microtome  Accessories. 
READING  GLASSES,  see  Magnifiers. 

READING  TELESCOPES,  sec  Catalog  F  of  Physical  Apparatus. 
REAGENT  BOTTLES,  see  Bottles. 

RECALESCENCE  OUTFIT,  see  Furnaces,  Electric;   Pyrometers;   or  write  for  special  informa- 
tion. 


11300.    RECEIVERS,  Retort,  glass,   plain. 

Capacity,  ee 125  250  500 

Each 50  .55  .65 

11304.    RECEIVERS,  Retort,  glass,      with  tubulature  and  glass  stopper. 

Capacity,  cc 125  250  500 

Each  .                                          75  .85  1.00 


11308.  RECEIVER,  Pauly's,  for  distillation  in  vacuum. 
RECEIVERS  for  Blowers,  see  Blowers. 
RECTIFIERS,  see  Electrical  Instruments. 


With  adapter  and  four  bulbs 


1000 
.75 


1000 
1.25 

3.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


427 


J 


No.  11320. 


No.  11472. 


11314. 
11316. 

11320. 

:     --1. 


11450. 
1  !452. 


REDUCTOR,   Blair's,  for  the  determination    of    phosphorus    in  "steel,    by    the    zinc    filtration 
method.     With  glass  stop-cock.     (See  Blair 's  Analysis  of  Iron.  8th  Edition,  page  89) ..     $2.00 

REDUCTOR.  Blair's,  same  as  Xo.  11314,  but  complete  with  support,   elamp,   two  flasks,   glass 
stop-cock,  and  connecting  tubes 6.00 

REDUCTION  TUBE,  of  Pyrex  hard  glass,  with  bulb  on  end.     Length,  15  em $0.25 

REDUCTION  TUBES,  of  Pyrex  hard  glass,  with  bulbs  in  center. 

Xo '. A 

Number  of  bulbs 1 

Length,  mm 300 

Each .30 

For  EEFEACTOMETERS  and  ACCESSORIES,  write  for  special  information. 

REGULATORS.  Gas  and  Electrical,  see  Thenno-regnlatoTS. 

REGULATORS.  Gas  Pressure,  see  Xos.  6530,  6556  and  7070. 

RESERVOIRS.  Leveling,  see  Bulbs,  Leveling,  Xo.  1902. 

RESPIRATOR,  for  protection  from  dust,  sawdust,  smoke,  fumes  and  gases.  -Made  of  soft  rub- 
ber and  provided  with  a  perfect  filter  device;  easily  kept  clean  and  bends  perfectly  to  fit  the 


B 

2 

350 
.42 


C 
3 

400 

.50 


face 


1.75 


1146-2. 

11468. 
11472. 
11478. 


RESPIRATOR  or  Face  Mask,  of  felted  material  so  formed  as  to  make  an  air-tight  joint  around 
the  face,  thereby  protecting  the  eyes,  nose  and  lungs  from  dust,  smoke,  fumes  and  gases. 
The  filters,  upon  which  the  efficacy  of  the  mask  depends,  do  not  need  renewing  and  are  guar- 
anteed for  three  years.  For  the  eyes  there  is  a  large  celluloid  or  mica  covered  opening,  per- 
mitting perfect  vision  to  all  points 10.00 

RETORT  ADAPTERS,  see  Adapters. 
RETORT  RECEIVERS,  see  Receivers. 

RETORTS.  Copper,  for  making  oxygen;  flask  shape,  with  iron  elamp  and  brass  delivery  tube 
fitted  with  ground  joint. 

Capacity,  ec 250  500  _ 

Each 2.90  3.40  4.15  5.60 

RETORTS.  Copper  for  distillation,  see  Distilling  Apparatus. 
RETORTS.  Glass,  plain. 

Capacity,  cc 125  250  500  1000 

Each .70  .80  .90  1.00 

RETORTS.  Glass,  tabulated,  with  ground  glass  stopper. 

Capacity,  ec 125  250  500  ' 

Each LOO  LIO  L25  1.80 

RETORTS,  Iron,  for  distilling  mercury,  ete.;  with  removable  cover,  fastened  by  screw  elamp, 
with  delivery  tube  ground  in  the  cover. 

Capaeity.ee 250  500  ;  4 

Each 3.80  4.10  4-50  6.00  8.00 


428 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  11502. 


No.  11504. 


No.  11536. 


No.  11530. 


RETORT,  Iron,  Skidmores,  see  No.  3440. 
11484.  RETORTS,  Transparent  Quartz,  plain. 

Capacity,    cc 50  100  200 

Each    $15.00        20.65         38.40 

REVOLUTION  COUNTERS,  see  Speed  Counters. 
RHEOSTATS,  see  Electrical  Instruments. 
11492.  RINGS,  Concentric,  Copper,  tinned  inside,  for  water  baths,  with  cover. 

Number  of  rings  in  set 5  6 

Outside  diameter  of  largest  ring,  inches 3%  4%  5%  6% 

Per  set 30  .40  .50  .60 

11494.  RINGS,  Concentric,  Iron,  with  two  removable  rings,  with  heavy  screw  for  clamping  on  support 
for  supporting  water  baths,  sand  baths,  flasks,  etc.    Diameter  of  outside  ring,  6  inches . .      .40 
11498.  RINGS,  Concentric,  Porcelain,  with  cover. 

Number  of  rings  in  set 5  6 

Outside  diameter  of  largest  ring,  cm 16  20.5 

Per  set 1.65  2.20 

11502.    RINGS,  Iron,  for  attaching  to  retort  stands;  with  %6  inch  screw.     Distance  from  rod  to  center 
of  rings,  4%  inches. 

Outside  diameter,  inches 2  567 

Inside  diameter,  inches l^io          %%6  3%          4^s  5%  6 

Each 20  .21  .22  .25  .26  .35 

11504.    RINGS,  Iron,  Extension,  for  fastening  to  retort  stand  by  means  of  Clamp  Holders  Nos.  2914  and 
2916.     Length  of  rod,  7%  inches. 

Outside  diameter,  inches 34567 

Each 12  .15  .18  .20  .25 

RINGS,  Suberite,  see  Cork  Rings  No.  3296. 
RING  STANDS,  see  Supports. 

ROASTING  DISHES,  see  Dishes,  Roasting,  No.  3864. 
11512.  ROPE,  Manila,  good  quality,  %-inch  diameter.  (No  order  taken  for  less  than  12  ft.)  .Per  foot     .04 

RUBBER  GOODS 

RUBBER  BAGS,  see  Gas  Bags  No.  6720. 

11520.    RUBBER  BANDS,  assorted,  in  *4  pound  boxes Per  box       1.00 

RUBBER  BOTTLES,  see  Bottles. 
11524.    RUBBER  BULBS,  for  dropping  pipettes,  etc. 

Capacity,  cc 5 

Each  . .' 04  .05 

11526.    RUBBER  BULBS,  large  size,  heavy  walled,  for  pipettes,  etc. 

Capacity,  ce 25  50 

Length,  inches 3% 

Diameter,  inches 1  Vi  2 

Each 15  .20 

11530.    RUBBER  BULB,  with  hard  rubber  valves,  for  pressure  only,  with  connecting  tube.     Capacity, 

about  50  cc 30 

RUBBER  BULB   EXPANDER,   see   No.   11630. 

6645.     RUBBER  BULB,  of  pure  gum,  with  flexible  tube  for  use  with  gas  analysis  apparatus.  .        .60 
6832.     RUBBER  BULB,  with  double  valves  of  hard  rubber  for  use  in  sampling  gas  for  analysis        .60 

RUBBER  BULBS,  double,  for  pressure,  see  Blower  No.  1382. 
11536.  RUBBER  CAPS,  flat  shape,  for  test  tubes  of  same  diameter  as  caps. 

Diameter,   inches - %  %  % 

Per   dozen 1.00          1.05         1.10         1.20 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


429 


No.  11552. 


No.  11556. 


No.  11562. 


No.  11572. 

11540.    RUBBER  CEMENT,  for  cementing  rubber  joints,  rubber,  etc  ............  Per  ounce  bottle     $0.15 

11544.     RUBBER  DAM,  pure  gum  ...........................................  Per  square  foot        SO 

11546.  RUBBER  DAM,  pure  gum,  36  inches  wide  .............................  Per  linear  foot  1.00 

RUBBER  DISKS  for  Foot  Bellows,  see  Blowers. 

RUBBER  FINGER  COTS,  see  Finger  Cots,  Rubber  No.  5514. 

RUBBER  FUNNELS,  see  Funnels. 

RUBBER  GLOVES,  see  Gloves. 

11552.  RUBBER  POLICEMEN,  narrow  shape,  for  removing  precipitates  from  walls  of  beakers,  etc.;  flat 

end,  %x%6  inch.     Complete  with  glass  rod  6x%6  inches  ...................  Each  .09 

Per  dozen        .90 

11553.  RUBBER  POLICEMEN.     Same  as  No.  11552,  but  without  glass  rod  ...........  Per  dozen        .45 

11556.  RUBBER  POLICEMEN,  wing  shape,  with  rubber  1%  inches  wide  at  end.     Complete  with  glass 

rod  6x%6  inches  .........................................................  Each  .09 

Per  dozen        .90 

11557.  RUBBER  POLICEMEN.     Same  as  No.  11556,  but  without  glass  rod  ...........  Per  dozen         .70 

11562.  RUBBER  SCRAPER  for  scraping  precipitates  from  the  walls  of  beakers,  etc.  Hard  rubber 
handle  with  soft  cone  shaped  rubber  tip  ...........................................  .20 

11566.  RUBBER  SHEETING,  white,  36  inches  wide  .................................  Per  yard     1.20 

RUBBER  SPATULAS,  see  Spatulas. 

11572.  RUBBER  STOPPERS,  made  from  best  quality  of  rubber  especially  for  chemical  laboratory  use; 
will  not  harden  from  age.  Each  size  furnished  in  three  styles  —  solid,  one  hole  or  two  holes. 
.......................................................................  Per  pound  1.80 


Table  Showing  Approximate  Number  of  Rubber  Stoppers  in  One  Pound, 


Number  

Oft      0 
17 

1 
18 

2 
20 

3         4 
23  |  25 

5 

• 

6 
32 

: 
37 

8 
41 

9 
45 

10 

50 

11 

56 

12 
63 

13 

68 

Diameter  small  end,  mm  

9     12 

1°0     80 

15 
fifl 

16 

!-       L 
42  1  33 

23 

••» 

26 

20  I 

30 
15 

33 
!">' 

3V 
11    | 

42 

~48~ 

6'                   ' 

53 

61 

Approximate       f   holid  
Number  in           •<    1  hole  

130     90 

6-> 

60 

45  |  35 

30 

21 

16 

13 

11 

8 

6 

5 

4 

One  Pound           1    2  hole  

138     94 

70 

64 

47   !  38 

32 

22 

17 

14 

12 

8 

6 

5 

4 

7372.  RUBBER  STOPPERS,  especially  designed  for  use  with  Moisture  Testers  Nos.  7360  to  7364,  to 
stand  the  high  temperature  existing  in  moisture  test  flasks;  they  are  necessary  when  copper 
flasks  are  used. 

No 5  6 

Per   dozen 1.65          2.20 

RUBBER  TESTING  APPARATUS,  see  Testing  Machines. 


430  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


RUBBER  TUBING,  ALL  KINDS 

Special  Notice.  Bubber  Tubing  of  the  various  kinds  listed  comes  in  original  12  foot  lengths 
from  the  manufacturer,  and  is  sold  only  in  lengths  of  3  feet  or  multiples  of  3.  This  enables 
us  to  avoid  the  waste  due  to  short  pieces  of  unsalable  lengths  and  permits  us  to  sell  the  tubing 
to  our  customers  at  a  reasonable  price,  without  the  necessity  of  a  charge  to  cover  the  loss. 

11580.  RUBBER  TUBING,  White,  light  wall,  cloth  impression.  This  tubing  is  recommended  for  gen- 
eral laboratory  use  where  an  inexpensive  tubing  is  desired. 

Diameter    inside,  inches %  %6  V*  %e  %  % 

Thickness  of  wall,  inches %4  %4  Vie  He  Via  %4 

Per  foot  (see  Special  Notice) $0.05  .07  .10  .12  .14  .24 

11582.  RUBBER  TUBING,  White,  heavy  wall,  same  quality  as  No.  11580.  The  %  inch  size  is  the  standard 
size  and  quality  for  Bunsen  burner  connections. 

Diameter  inside,  inches %6  %  %c  %  % 

Thickness  of  wall,  inches %4  %2  %2  "/M  % 

Per  foot  (see  Special  Notice) 13  .17  .20  .26  .36 

11588.  RUBBER  TUBING,  Red,  Antimony,  light  -wall.  Retains  its  elasticity  longer  than  No.  11580  and 
is  preferred  by  many  users  for  this  reason. 

Diameter  inside,  inches %  %6  %  %Q  %  % 

Thickness  of  wall,  inches %4  %4  i/16  i/10  %4  %2 

Per  foot  (see  Special  Notice) 06  .09  .12  .15  .21  .35 

11590.  RUBBER  TUBING,  Red,  Antimony,  heavy  wall,  same  quality  as  No.  11588.  Preferred  by  many 
users  for  Bunsen  burner  tubing  in  place  of  No.  11582. 

Diameter    inside,  inches %g  *4  ^  %  % 

Thickness  of  wall,  inches %4  %2  %2  %4  % 

Per  foot  (see  Special  Notice) 15  .22  .27  .36  .54 

11594.  RUBBER  TUBING,  Black,  pure  gum,  light  wall,  seamless.  This  tubing  will  not  bloom  ami  in 
especially  suited  for  gas  analysis  work. 

Diameter  inside,  inches %              %6              %              9ic              %  % 

Thickness  of  wall,  inches %4             %j             Ke             Vie            %4  %2 

Per  foot  (see  Special  Notice) 08             .10             .15             .17             .25  .42 

11596.   RUBBER  TUBING,  Black,  pure  gum,  heavy  wall,  same  quality  as  No.  11594. 

Diameter  inside,  inches %2             %Q             54              fyin  %  % 

Thickness  of  wall,  inches %4             %4             %o             %o  %4  % 

Per  foot  (see  Special  Notice) 15            .17            .22            .27  .42  .60 

11600.  RUBBER  TUBING,  Latiruco,  Black,  light  wall,  pure  gum,  free  from  blooming,  very  elastic  and 
impervious  to  gases.  It  clings  to  glass  tubing,  eliminating  wiring.  Especially  suitable  for 
connections  to  gas  analysis  apparatus.  Each  length  bears  the  trade-mark  Labruco  repeated 
frequently. 

Diameter   inside,   inches %       %,      ^e       V-t      5/ie        %        %        %        %        1 

Thickness  of  wall,  inches %2       %,       %4       #6      }{0       %2      %2       %        %        % 

Per  foot  (see  Special  Notice) ...       .06       .09      .12      .18      .24      .35      .50      .80      .90    1.15 
Per  12-foot  length 60       .90     1.20    1.80     2.40    3.90    5.25    


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A, 


431 


Ho.  11624. 


Nos.  11600-4. 


No.  11626. 


No.  11630. 


11602.  RUBBER  TUBING,  Labruco,  Black,  heavy  wall,  same  quality  as  No.  11600. 

Diameter    inside,    inches %       %2  $ie  %  9i« 

Thickness  of  wall,  inches ^6       l{6  ^6  %2  %l 

Per  foot  (see  Special  Notice) $0.10       .12  .15  .28  .36 

Per   12-foot  length 1.05    1.25  1.50  2.70  3.60 

11604.  RUBBER  TUBING,  Labnico,  Red,  light  wall,  same  as  No.  11600,  except  for  the  color. 

Diameter    inside,    inches %%2JKe%9ie%%%%l 

Thickness  of  wall,  inches fa       %4       %4       He       He      %2      %2       %        %        % 

Per  foot  (see  Special  Notice) ...       .06       .09       .12       .18       .24       .35       .50       .80       .90     1.15 
Per  12-foot  length 60       .90     1.20    1.80    2.40    3.90    5.25    

11610.  RUBBER  TUBING,  Pressure,  Black,  semi-pure  gum,  extra  heavy  wall,  for  filter  and  air  pump 
connections,  vacuum  work,  etc.  Because  of  its  flexibility  this  tubing  is  also  useful  for  connec- 
tions to  mercury  leveling  bulbs,  nitrometers,  etc. 

Diameter  inside,  inches ^6  ^4 

Thickness  of  wall,  inches ^6  ^6 

Per  foot  (see  Special  Notice) .50  .60 

11614.    RUBBER  TUBING,  Pressure,  cloth  insertion,  heavy  wall,  for  air  pump  connections,  etc. 

Diameter  inside,  inches ${$  *4  9i6  "•»  % 

Per  foot  (see  Special  Notice) 12  .15  .16  .18  .22 

11618.  RUBBER  TUBING  for  Gooch  Crucibles,  thin  walled  band  tubing,  pure  gum,  very  elastic. 

Width  outside  when  flat,  inches 1%  1%  2% 

Width  inside  when  flat,  inches 1%  1%  2 

Per   foot .25  .30  .40 

11624.  TUBING,  Flexible,  Steel,  with  rubber  packing,  for  connections  to  Bunsen  burners,  hot  plates, 
etc.  It  is  indestructible  except  by  acids  and  excess  of  oil,  is  gas  tight  and  safe  from  kinking 
or  breaking.  Each  length  is  furnished  with  heavy  rubber  socket  at  each  end.  Inside  diameter, 
%  inch. 

Length,  inches 24  36 

Each 25  .35 

11626.  TUBING,  Flexible,  Steel,  made  entirely  of  metal  by  a  new  process,  without  rubber  or  other  pack- 

ing.    It  is  gas  tight  and  indestructible,  except  by  strong  acids,  and  will  last  indefinitely.     In- 
side diameter,  ^4  inch per  foot         .30 

11627.  RUBBER  CONNECTORS  for  use  with  No.  11626 per  pair        .10 

11630.  RUBBER  TUBE  and  Bulb  Expander,  for  stretching  tubing  and  bulbs  to  facilitate  attaching 
to  connection  tubes,  pipettes,  etc .50 


432 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  11646  (five  positions). 


No.  11642. 


No.  11640. 


F661. 

11640. 
11642. 
11646. 


F845. 


11796, 


RULE,  Celluloid,  metric  and  English,  6  inches  long.  Of  white  celluloid  with  one  edge  gradu- 
ated in  mm,  other  edge  in  eighths  of  inches.  The  two  scales  are  numbered  from  the  same  end 
of  the  rule,  making  easy  a  comparison  of  measurements  in  the  two  systems.  This  scale  may 

easily  be  carried  in  the  vest  pocket Each  .05 

Per  hundred      4.50 

RULE,  English  and  Metric,  boxwood,  12  inches  by  16ths  on  one  side,  millimeters  on  the  other. 
Four  fold,  solid  brass  joints,  with  brass  caliper  extension  for  measuring  diameters  up  to  2% 
inches  or  70  mm.  Made  to  carry  in  pocket $0.65 

RULE,  English  and  Metric,  light  boxwood,  36  inches  by  16ths  on  one  side,  millimeters  on  the 
other.  Six  fold,  spring  joints,  very  convenient  for  comparing  English  and  metric  measure- 
ments. Made  to  carry  in  pocket .50 

RULE,  Johnson's  Patent  Combination.  This  six-inch  folding  pocket  rule  is  made  of  spring  Ger- 
man silver  accurately  and  distinctly  graduated;  it  can  be  used  as  a  Hook-rule,  Caliper-gauge, 
Protractor,  Triangle  or  Try-square.  The  upper  edge  is  graduated  in  32nds,  the  lower  edge  in 
16ths.  The  caliper  blade  is  graduated  in  16ths  on  one  side  and  32nds  on  the  other.  The  pro- 
tractor is  graduated  every  five  degrees  and  is  provided  with  a  vernier  reading  to  %  degree. 
This  handy  and  indispensable  rule  can  be  set  to  any  desired  angle,  and  the  center  joint  is  so 
constructed  that  the  rule  remains  firm  wherever  set 2.50 

RULES,  Metric,  see  Scales. 

RULE,  Parallel,  see  Drawing  Instruments. 

RULES,  Slide,  see  Slide  Rules. 

RUPERT'S  DROPS per  dozen        .50 

SAMPLE  BAGS,  see  Paper  Bags. 

SAMPLE  BOTTLES,  see  Bottles. 

SAMPLE  BOXES,  see  Boxes. 

SAMPLE  JARS,  see  Jars. 

SAMPLERS,  Hand,  for  Coal  and  Ore,  consisting  of  sampler  of  tin  with  handle,  divided  into  par- 
allel troughs,  and  a  scoop  of  sheet  iron  with  band-iron  handle. 

No A       • 

Dimensions,  inches 6x8% 

Width  of  troughs,  inches Vz 

Number  of  troughs 6 

Each    .  2.25 


B 

7x9 

V4 

14 
3.70 


C 
10x10 


D 

11x12 


10 
3.80 


4.15 


11800.  SAMPLERS,  Jones,  for  quick  and  uniform  sampling  of.  ores,  cement,  coal,   etc.;   easily  cleaned. 
Complete  with  hopper  mounted  on  support,  4  sampling  pans,  brush  and  scoop. 

No.  .  : A 


Size,  inches 6x6 

Width  of  troughs,  inches % 

Number  of  troughs 8 

Each   . 11-00 


B 

10x10 

% 

10 
19.80 


CEXTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


433 


No.  11830. 


No.  11832. 


11 002. 

11804. 

11808. 


11810. 
11812. 


11818. 
11S22. 

11830. 
11832 


SAMPLER,  Riffle,  for  reducing  quantity  of  4-mesh  coal  samples,  according  to  specifications  of 
the  United  States  Bureau  of  Mines  and  the  American  Society  for  Testing  Materials.  With 
twelve  divisions,  each  %-inch  wide.  Complete  with  four  sampling  pans,  scoop  and  brush. 
(See  Journal  of  Industrial  and  Engineering  Chemistry,  Vol  IX,  No.  1,  for  January  1917)  116.00 

SAMPLER,  Riffle,  for  reducing  the  20  amd  60-mesh  coal  to  a  laboratory  sample.  Similar  to  No. 
11802.  but  with  twelve  divisions  each  %  inch  wide.  Complete  with  four  sample  pans,  scoop 
and  brush  22-00 

SAMPLER,  Braun  Umpire  Ore.  for  band  power,  for  accurate  and  impartial  sampling.  Consists 
of  a  hopper  mounted  on  a  support;  two  buckets,  each  divided  into  four  parts,  two  open  and 
two  closed;  and  a  receiver.  By  means  of  gears  attached  to  the  handle  the  buckets  are  made 
to  revolve  in  opposite  directions;  with  the  same  motion  the  hopper  is  agitated  by  means  of 
a  cam  and  coiled  spring.  The  sample  is  halved  in  the  upper  bucket  and  again  in  the  lower, 
allowing  one  quarter  of  the  original  to  fall  into  the  receptacle.  Kefeeding  the  quarter  ob- 
tained gives  ^ieth-  an<l  ^7  a  second  refeeding  ^th  of  the  original  sample  is  obtained.  All 
parts  are  removable  and  easily  accessible  for  cleaning.  Width  of  sampler,  10  inches;  length, 
21  inches:  height.  41  inches;  shipping  weight,  125  pounds 43.50 

SAMPLER,  Braun  Umpire  Ore,  for  power,  with  tight  and  loose  pulleys 54.00 

SAMPLER.  Braun  Universal,  with  tight  and  loose  pulleys  for  power.  Consists  of  two  separa- 
tors, which  revolve  in  opposite  directions,  each  divided  into  four  parts.  By  this  means,  the 
original  sample  is  quartered  in  the  upper  separator,  half  going  into  the  discard  and  half  into 
the  lower  separator,  where  the  process  is  repeated,  allowing  one  quarter  of  the  original  sam- 
ple to  fall  into  the  receptacle,  the  rest  going  into  the  discharge  chute.  The  hopper  is  mechan- 
ically agitated  by  means  of  a  cam,  and  is  fitted  with  a  gate  to  control  the  flow.  The  entire 
machine  is  enclosed  in  a  sheet  iron  shell  and  is  practically  dust-proof.  Easily  and  quickly 
cleaned,  an  air  blast  being  the  most  convenient  method.  Length  over  all,  32  inches;  width, 
14  inches;  height.  35  inches;  size  of  pulleys,  12x2  inches;  shipping  weight,  220  pounds  106.00 

SAMPLING  CLOTH,  heavy  duck  oil  cloth,  black,  for  mixing  coal  samples,  according  to  the 
method  described  in  Standard  D21-16  of  the  American  Society  for  Testing  Materials.  Size. 
6x8  feet 7-00 

SAMPLING  PANS,  of  seamless  tin-plate,  for  ore. 

Diameter,   inches 5  6  7  8%  10 

Each    .07  .09  .12  .16  .22 

SAND,  see  Sea  Sand. 

SAND,  Standard  for  Cement,  see  Cement  Testing  Apparatus. 
SAND  BATHS,  cold  rolled  steel,  shallow  form. 

Diameter,   inches 3  4  5  <5  8  10 

Each    08          .10          .12          .16          .30          .60 

SAND  BATHS,  cold  rolled  steel,  hemispherical  form. 

Diameter,  inches 3  4  5  6  8  10 

Each    10  .14  .20  .25  .40  .60 


434 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


No.  11850. 


No.  11852. 


No.  11840. 


No.  11854. 


No.  11834. 


No.  11856. 


No.  11858. 


11834. 
11840. 


11850. 
11852. 

11834. 


2 
.75 


3 
.90 


5 
1.10 


10 
1.50 


SAND  BATH,  Hot  Plate,  a  Russia  iron  tray,  8x10  inches,  on  legs $2.25 

SAND  GLASSES,  improved  construction  with  metal  bases. 

For,    minutes    1 

Each    75 

SAND  PAPER,  see  Paper. 

SAW,  Combination.     Wood  handle,  with  polished  brass  adjusting  lever  and  set  of  three  inter- 
changeable blades,  including  a  10-inch  keyhole  blade  and  a  14-inch  compass  blade 1.40 

SAWS,  Crosscut,  good  grade  steel,  filed  ready  for  use. 

Length,  inches 

Each  . 


20 
1.40 


26 
1.80 


11856. 
11858. 
11859. 


SAW,  Dovetailing  and  Depth  Cutting,  one  side  for  cross,  the  other  for  rip  sawing.  The  back  of 
this  saw  constitutes  a  slot  through  which  the  blade  slides,  enabling  the  workman  to  move,  space 
and  adjust  it  to  any  desired  width  or  distance  from  edge  of  back,  so  as  to  cut  exactly  any  de- 
sired depth.  Length  of  blade,  18  inches 2.65 

SAW,  Hack,  for  cutting  metals.  Solid  steel  frame,  natural  finish,  enamel  handle;  blade  can  be 
faced  four  wavs.  With  one  blade .70 


SAW,  Hack,  of  steel,  white  nickel-plated,  except  the  handle.     Adjustable  for  8  to  12-inch  blades; 
blades  can  be  faced  four  ways.     With  one  blade   1.75 

HACK  SAW  BLADES,  high  grade  steel. 

Length,  inches 8  12 

Per  dozen  1.00  1.30 

SAW,  Keyhole,  see  No.  11850  Combination  Saw. 

SAWS,  Pruning,  send  for  Catalog  A  of  Agricultural  Apparatus. 

11864.    SAW,  Rip,  good  grade  steel,  filed  ready  for  use;  length  28  inches 2.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


435 


El  i'l  «  •  •  7  •  •  •  I  ^  a  •  5  s  7^«^ 


7  o  e  80  i 


No.  11882. 


No.  11896. 


No.  F727. 


NO.  F729. 


11870. 
11871. 

11872. 
11874. 

11876. 
11878. 
11882. 

11884. 
11888. 
11890. 
11892. 

F727. 

F729. 
11896. 


Per  dozen 
SCAIiE,  Paper,  metric.  Same  as  No.  11871,  but  with  zero  at  the  bottom Each 


11904. 
1190S. 


11912. 

11916. 
1191S. 


SCALE,  Paper,  metric,  printed  on  heavy  bond  paper,  3.5x23.5  cm;  20  em  along  one  edge  is  gradu- 
ated in  mm  divisions Per  dozen  $0.10 

Per  hundred        .75 
SCALE,  Paper,  metric.     1  meter  long,  graduated  in  millimeters.     For  use  vertically;  zero  at  the 

top  Each  .06 

~       •"  .54 

.06 

Per  dozen        .54 

SCALE  (METER  STICK),  Maple,  2  cm  square.  One  face  is  plain  and  shows  the  length  of  the 
simple  meter;  the  second  face  is  graduated  in  tenths  of  meters,  or  decimeters;  the  third  face  is 
graduated  in  hundredths  of  meters,  or  centimeters;  and  the  fourth  face  is  graduated  in  thou- 
sandths of  meters,  or  millimeters.  The  last  named  face  gives  divisions  also  in  decimeters  and 
centimeters.  This  piece  is  valuable  in  teaching  students  the  metric  system  of  lengths. .  .67 
SCALE  (METER  STICK),  Boxwood.  A  high-grade  stick  graduated  in  millimeters  on  both  edges 

of  one  face;  other  face  blank 60 

SCALE  (METER  STICK),  Boxwood.     Same  as  No.   11876,   but  graduated   in   millimeters  and 

inches -70 

SCALE  (METER  STICK),  Maple.  Both  edges  of  one  face  are  graduated  in  decimeters,  centi- 
meters and  millimeters;  one  edge  of  the  other  face  in  inches  and  eighths .25 

SCALE   (HALF-METER  STICK),  Maple.     Same  graduation  as  No.  11882 

SCALE  (METER  STICK),  Maple.     Same  as  No.  11882,  but  ends  tipped  with  brass 40 

SCALE    (HALF-METER  STICK),  Maple.     Same  as  No.  11884,  but  ends  tipped  with  brass         .30 
SCALE   (DOUBLE-METER  STICK),  Maple,  ends  tipped  with  brass.    Same  as  No.  11838,  but  two 

meters  long 1.00 

SCALE  (RULE),  Maple,  metric  and  English,  12  inches  long,  one  face  graduated  on  one  edge  in 
millimeters  and  on  the  other  in  inches  and  16ths.  Double  bevelled  with  protractor  (5  degree 

divisions)  on  back Each  .04 

Per  dozen        .40 

SCALE  (RULE),  Boxwood,  metric  and  English,  12  inches  long.  One  edge  bevelled  and  accu- 
rately graduated  in  millimeters,  the  other  face  graduated  in  inches  and  16ths.Each  .10 

Per  dozen      1.05 

SCALE,  Tap  Drill,  to  determine  the  proper  drill  to  use  preceding  the  use  of  a  machine  screw 
tap  of  any  size.  On  one  side  is  a  list  of  machine  screw  tap  sizes  followed  by  lists  of  the 
tap  drill  size  numbers,  their  decimal  equivalents,  the  corresponding  body  drill  size  numbers 
and  their  decimal  equivalents.  On  the  reverse  side  of  the  scale  is  a  table  of  decimal  equi- 
valents of  ordinary  fractions  by  f>4ths  up  to  s^ths.  At  the  lower  end  is  an  inch  scale  gradu- 
ated to  64ths.  Made  of  flexible  spring  steel  1^6  inches  wide  and  694  inches  long 50 

SCISSORS,  see  Shears. 
SCLEROSCOPE,  see  Hardness  Testers. 

SCOOP.  Agateware,  3x5%  inches,  with  handle     .20 

SCOOPS.  Horn,  flat  and  wide,  with  square  ends,  for  ordinary  use. 

Length,  cm 10  12  14  16 

Each    15          .18          .21          .27 

SCOOP,  Iron,  adopted  by  the  Cleveland  Iron    Chemists    as    standard    for    sampling    iron    ores 

Length,  3H  inches:  width,  2*4  inches:  depth,  1%  inches;  with  6%  inch  handle 50 

SCOOP.  Sampling,  of  heavy  iron  with  wood  handle,  5x4%  inches 40 

SCOOP.  Tin  Plate,  with  handle,  for  mixing.     Length  of  bowl,  8  inches;  width,  5%  inches  .  .46 
SCOOPS,  Weighing,  see  Balance  Accessories. 


486 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  11921 


2% 
2000 
3.00 
2.25 


2% 
1750 
3.50 
2.60 


11924.  SCORIFIERS,  Denver  Fire  Clay. 

Diameter,   inches 2 

Number  in  original  barrel 2000 

Per  100 $2.80 

Per  100  in  original  barrel 2.05 

SCORIFIER  TONGS,  see  Tongs. 

11930.  SCRAPER,  for  cleaning  muffles,  flat  end,  length  36  inches 

11932.  SCRAPER,  same  as  No.  11930,  but  with  end  bent   

SCREWS,  Machine,  Iron,  Flat  Head.    In  gross  packages  only. 

Length,  inches  ...      %g          %  %e         %%%%%! 

11940 A.      No.     2,  per  gross..  .   $0.30         .30          .30         .30          .30          .35          .40 
11940B.      No.     4,  per  gross ...       .30         .30          .30         .30          .30          .35          .40          .40 
11940C.      No.     6,  per  gross.  ..       .35         .35          .35         .35          .35          .40          .45          .45          .50 
11940D.      No.     8,  per  gross...       .35         .35          .40         .40          .45          .50          .50          .55          .60 
11940E.      No.  10,  per  gross...  .55          .60         .60          .65          .70          .75          .75          .80 


2% 
1000 
4.25 
3.15 

.50 
.50 


.70 

.75 

1.20 


1194? A-E.  SCREWS,  Machine,  Iron,  Round  Head.     Same  sizes  and  prices  as  No.  11940.     In  gross  pack- 
ages only. 
SCREWS,  Machine,  Brass,  Flat  Head.    In  gross  packages  only. 


.65 

.75 

.95 

1.50 

2.00 


% 
.75 
.80 
1.05 
1.65 
2.25 


.85 

.90 

1.20 

1.80 

2.60 


Length,  inches  ...      ^e          %  <M6 

11944  A.  No.  2,  per  gross.  ..  .60  .60  .60 
11944B.  No.  4,  per  gross  ...  .65  .65  .70 
11944C.  No.  6,  per  gross  ...  .85  .85  .90 
11944D.  No.  8,  per  gross  ...  1.25  1.25  1.35 
11944E.  No.  10,  per  gross.  .  .  1.80  1.80  1.90 
11946A-E.  SCREWS,  Machine,  Brass,  Round  Head. 

ages  only. 
SCREWS,  Wood,  Iron,  Flat  Head.    In  gross  packages  only. 

Length,  inches  .......................       %  % 

11950A.      No.    2,  per  gross  ......  i  ..................  50  .50 

11950B.     No.    4,  per  gross  ........................  50  .50 

11950C.      No.    6,  per  gross  ...................  '.  .  .  .      .50  .50 

11950D.      No.     8,  per  gross  ........................  60  .60 

11950E.      No.  10,  per  gross  .......................  .70 

11952A-E.  SCREWS,  Wood,  Iron,  Round  Head.     Same  sizes  as  No.  11950. 

In  gross  packages  only. 
SCREWS,  Wood,  Brass,  Flat  Head.     In  gross  packages  only. 

Length,  inches  .......................       %  V2  % 

11954A.     No.    2,  per  gross  ..................  .....      1.20  1.25  1.30 

11954B.      No.    4,  per  gross  .......................      1.35  1.40  1.50 

11954C.      No.     6,  per  gross  .......................      1.55  1.70  1.80 

11954D.      No.     8,  per  gross  .......................      1.95  2.15  2.40 

11954E.      No.  10,  per  gross  .......................  2.80  3.15 


1.05 
1.35 
2.00 
3.00 


Same  sizes  and  prices  as  No. 


.50 
.50 
.55 
.60 
.70 
Prices 


1.50        1.65        2.70 

2.15        2.35        3.45 

3.35        3.70        4.80 

11944.     In  gross  pack- 


.50 
.55 
.65 
.70 


.55 
.60 
.65 
.75 


.55 
.60 
.70 
.80 


0.10  per  gross  greater. 


1.45 
1.65 
2.00 
2.60 
3.45 


% 
1.85 
2.00 
2.15 
2.85 
3.75 


2.25 
2.35 
3.20 
4.10 


11956A-E.  SCREWS,  Wood, Brass, Round  Head.    Samesizes  and  prices  as  No.  11954.    In  gross  packages  only. 
11960.         SCREW  DIES,  round,  adjustable,  %  inch  diameter,  %  inch  thick. 


11961. 


No A  B  C 

Screw  gauge  No 2  4  6 

Approx.  diam.,  in . . .      %4  %4          %4 

No.  threads  to  inch..      56  36 

Each    95  .80          .60 

SCREW  DIE  STOCK,  for  holding  No.  11960  Dies 


D 

E 

F 

G 

H 

6 

8 

8 

10 

12 

%4 

%o 

%2 

Mo 

%•> 

40 

32 

40 

32 

24" 

oO 

.60 

.60 

.60 

.60 

J 

14 
% 
20 
60 
.80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


437 


No.  11978. 


No.  11982. 


No.  11970. 


No.  11988. 


No.  11994. 


11964.  SCREW  DIES,  round,  adjustable. 

Xo A  B  C  D 

Diameter  of  die,  inches 1  1%«  2% 

Diameter  of  screw,  inches Vt  %  %  % 

No.  threads  to  inch 20  16  12  10 

Each    *L10  L10  1.50  3.00 

11965.  SCREW  DIE  STOCK,  for  holding  Xo.  11964  Dies. 

Xo ABC 

For  die  of  diameter,  inches 1  l^ie  2% 

Each   1.80  3.70  4.00 

11968.  SCREW  DIE  AND  TAP  SET,  with  stock  7  inches  long,  tap  wrench  7%  inches  long,  6  dies  i^6 
inch  diameter  and  6  taps  cutting  threads  4-36,  6-32,  8-32,  10-24,  12-24  and  14-20.  Set  is  en- 
closed in  neat  hardwood  case 8.00 

11970.  SCREW  DIE  AND  TAP  SET,  with  stock  9  inches  long,  5  dies  1  inch  in  diameter,  and  5  taps 
cutting  threads  ^4-20,  %6'18>  %-l*>,  vie-14  and  %-12.  Set  is  enclosed  in  neat  hardwood  case. 

12.50 

11978.    SCREW  DRIVERS,  with  steel  blade  in  wooden  handle. 

Length,  inches 4  8 

Each 20  .35 

11980.  SCREW  DRIVER,  rosewood  handle  and  finest  steel  blade,  elegantly  polished  throughout.  Es- 
pecially adapted  for  instrument  use.  Indispensible  to  the  laboratory.  Length  over  all,  5% 

inches;  length  of  blade,  2  inches;  width  of  blade,  %  inch .40 

11982.    SCREW  DRIVER,  Jewelers',  of  steel,  nickel-plated,  with  blade  i^6  inch  in  width.     Length  over 

all,  31!  inches   .25 

11984.  SCREW  DRIVER,  Ratchet,  a  high  grade  tool.  Blade  and  ratchet  mechanism  made  of  oil  tem- 
pered tool  steel;  changes  from  right  to  left  are  made  by  turning  the  knurled  ferrule.  Length 

of  blade,  6  inches;  width  of  blade,  >4  inch 1.10 

11988.  SCREW  DRIVER  POCKET  SET,  with  3  blades  of  assorted  sizes  and  1  reamer  for  making  or  en- 
larging holes.  When  not  in  use  the  blades  are  kept  in  the  hollow  handle.  314  inches  long 

when  closed;  polished  and  nickel-plated .90 

11994.         SCREW  EYES,  of  bright  wire. 

Xo 214  12  7 

Length,  approx.,  inches %  1  IV, 

Per  dozen  .,  05  .07  .12 


438 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  12000.     No.  12001, 


No.  12026. 


11996. 


14 


SCREW  HOOKS,  of  bright  wire. 

No 

Length  over  all,  approx.,  inches 

Per  dozen $0.06 

SCREW  PITCH  GAGE,  see  No.  6486. 
12000.    SCREW  TAPS,  standard. 

.      A 
2 


No.  12032. 


12 

11/3 

.08 


10 

2 

.09 


8 

2V* 
.12 


B 

4 


C 
I 


D 
6 


E 
8 


G 
10 


H 
12 

%2 
24 

.26 


J 

14 


20 
.45 
N 
% 
10 
1.20 


No 

Screw  gage  No 

Approx.  diam.,  inches %4          %4         %4          %4          %2          %,          %6 

No.  threads  to  inch 56  36  32  40  32  40  32 

Each 44          .30          .26          .26          .26          .26          .26 

No K  L  M 

Diameter,  inches 14  %  % 

No.  threads  to  inch 20  16  12 

Each 45  .55  .70 

12001.  SCREW  TAP  WRENCH,  for  taps  %-inch  and  smaller 1.50 

12002.  SCREW  TAP  WRENCH,  for  taps  %  to  %-inch   2.00 

12010.  SEA  SAND  for  cleaning  platinum  ware per  pound        .10 

SEALING  WAX,  see  Wax,  Sealing. 

SELENIUM  CELLS,  see  Catalog  F  of  Physical  Apparatus. 

F7365.  SEXTANT,  Metal  Model,  full  size,  with  which  quite  accurate  work  is  possible.  The  main  scale 
is  graduated  in  20  minute  divisions  and  may  be  read  to  30  seconds  by  means  of  the  vernier  on 
the  index  arm.  Complete  with  mirrors,  mirror  mountings,  sight  tube,  handle  and  logs  for 
support 22.50 

SHAKING  APPARATUS 

12026.  SHAKING  APPARATUS,  Camp's  (Patented),  used  extensively  by  the  United  States  Steel  Cor- 
poration and  other  steel  and  iron  laboratories  for  the  rapid  precipitation  of  phosphorus  by  the 
molybdic  acid  method,  and  for  dissolving  steel  or  pig  iron  for  carbon  combustion.  The  disk 
is  made  to  hold  six  flasks,  Erlenmeyer  or  Florence  shape,  from  6  to  24  ounces  capacity.  Power 
required  to  operate,  about  i^5  h.  p.;  diameter  of  pulley,  6  inches;  proper  speed  of  operation, 
100  to  140  r.  p.  m 27.50 

12028.  SHAKING  APPARATUS,  Camp's,  same  as  No.  12026,  but  with  wooden  disk  and  clamps  for 
twelve  volumetric  flasks  of  100  cc  capacity.  Widely  used  in  sugar  analysis 35.00 

12032.  SHAKING  APPARATUS,  Chest  of  Drawers  Design,  with  polished  hardwood  chest  containing 
six  drawers,  with  a  capacity  of  eight  250  cc  bottles  each.  Requires  %  h.  p.  motor  to  operate. 
Complete  on  hardwood  base  with  enclosed  gear  but  without  motor 75.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


439 


!No.  12038. 


No.  12048. 


No.  12040. 


No.  12049. 


12038.  SHAKING  APPARATUS,  Electric,  for  four  bottles.  Constructed  of  heavy  cast  iron  making  it 
strong  and  rigid,  with  ball  bearings  affording  smoothness  of  motion.  The  clamps  will  take 
ordinary  bottles  from  200  to  1000  cc,  and  by  means  of  blocks,  smaller  bottles  and  tubes  may 
be  held.  The  speed  may  be  varied  according  to  the  load;  for  four  100  cc  bottles,  300  r.  p.  m. 
should  be  used;  for  small  bottles  about  600  r.  p.  m. 

No A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    $134.40      134.40       129.60       129.60 

12040.  SHAKING  APPABATUS,  Electric,  similar  to  No.  12038,  but  for  two  bottles  or  tubes  up  to  50  cc 

capacity.     Especially  suited  for  sputum  work.     The  speed  is  about  1000  r.  p.  m.,  subjecting 

the  bottle  contents  to  very  vigorous  shaking. 

No A  B  C  D 

A.C.  D.C. 

For   volts 110  220  110  220 

Each    84.00         84.00  78.00         78.00 

12041.  HEAD  for  No.   12040,  to  take  two  Erlenmeyer  flasks  of  150  cc  capacity 14.40 

12042.  HEAD  for  No.  12040,  to  take  four  50  cc  bottles   or   tubes,  at   a   maximum  speed  of   about   800 

r.  p   m 28.80 

12048.  SHAKING  APPARATUS,  Electric,  Rickard's,  for  Sputum  Bottles,  very  convenient  for  labora- 
tories examining  many  samples  each  day,  as  in  Boards  of  Health.  Arranged  for  shaking 
samples  in  the  original  collection  bottles,  thus  obviating  danger  of  confusion  or  contamina- 
tion If  it  is  considered  desirable  to  centrifuge  the  sputum  in  the  same  bottle,  this  may  be 
done  by  using  No.  2735  Sputum  Bottle  Carrier  with  Heads  Nos.  2681  of  2685  and  Centrifuges 
Nos.  2670  or  2696.  With  variable  speed  control  for  motor.  Maximum  speed  with  24  bottles, 
about  600  r.  p.  m.  Without  bottles. 

No A  B  C  D 

A.C.  D.C. 

For   volts 110  220  110  220 

Each    134.40       134.40       129.60       129.60 

SPUTUM  BOTTLES  for  No.  12048,  see  No.  2757. 

12049  HEAD  for  No.  12048  to  take  four  bottles  up  to  1000  cc,  for  use  in  place  of  24  sputum  bottle 
head  57.60 


440 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  12084-5. 


Nos.  12086-7. 


No.  12078. 


No.  12076. 


12054.  SHAKING  APPARATUS,  Horizontal  Form,  for  single  bottles  up  to  five  gallons  capacity.  With 
speed  reducing  gear  from  which  three  speeds  may  be  obtained.  Can  be  operated  by  %  h.  p. 
motor.  Without  motor $47.50 

12056.  SHAKING-  APPARATUS,  Horizontal  Form,  same  as  No.  12054,  but  for  two  bottles  up  to  five 
liters  capacity 48.00 

12058.  SHAKING  APPARATUS,  Horizontal  Form,  same  as  No.  12054,  but  for  four  bottles  up  to  two 
liters  capacity 50.00 

12060.  SHAKING  APPARATUS,  Horizontal  Form,  same  as  No.  12054,  but  with  two  hardwood  trays, 
with  a  capacity  of  eight  250  cc  bottles  each 52.50 

12066.  SHAKING  APPARATUS,  Kent  Laboratory  Type,  for  3  bottles  up  to  2000  cc 60.00 

12070.  SHAKING  APPARATUS,  Massachusetts  Institute  of  Technology  Form,  for  eight  250  cc  bottles. 

Especially  adapted  for  use  in  solubility  determinations,  conductivity  work,  etc 50.00 

12076.  SHEARS,  Paper,  high  grade  steel. 

Length  of  blades,  inches 6  8 

Each 1.40  2.50 

12078.  SHEARS,  Tinners'  Snips,  for  cutting  metal.     Length  of  cut,  2%  inches 90 

SHEARS,  Pruning,  see  Catalog  A  of  Agricultural  Apparatus. 

SIEVES 

SIEVES,  Brass  Frame,  seamless,  brass  gauze  (for  Covers  and  Bottom  Pans  see  Nos.  12102  and 
12104). 

Mesh    10  20            40            60            80          100          200 

12084.  Each,  5  inches  in  diameter 1.25  1.25         1.40         1.45         1.50         1.90         3.20 

12085.  Each,  8  inches  in  diameter 1.90  2.20        2.25        2.35        2.50        3.00        5.50 

SIEVES,  same  as  Nos.  12084  and  12085,  in  sets  of  five,  one  sieve  fitting  on  top  of  another,  with 
one  cover  and  one  bottom  pan;   set  consists  of  20,  40,  60,  80  and  100  mesh. 

12086.  Per  set,  5  inches  in  diameter 8.50 

12087.  Per  set,  8  inches  in  diameter 13.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


441 


No.  12090. 


No.  12096. 


No.  12102. 


!^AL  SCIENTIFIC 

No.  12104. 


No.  12098. 


No.  12110. 


No.  7398. 


12090.  SIEVES,  Brass  Frame,  seamless,  having  sheet  brass  bottom  with  circular  perforations.  Exten- 

sively used  in  soil  analysis  and  seed  testing.    Diameter,  5  inches. 

Diameter  of  perforations,  mm %  1  2  3  5 

Each    f $1.40         1.35          1.30          L30          L30 

12091.  SIEVES,  complete  set  of  five  of  No.  12090,  with  brass  cover  and  bottom  pan 8.50 

12092.  SIEVES,  set  same  as  No.  12091,  with  3  mm  and  5  mm  sieves  omitted 7.25 

For  Cover  and  Bottom  Pans  see  Nos.  12102  and  12104. 

12096.  SIEVE  FRAME,  same  as  No.  12090  without  bottom  pan,  but  with  brass  ring  for  holding  bolt- 
ing cloth.  Diameter,  5  inches - 1.00 

12098.  BOLTING  CLOTH,  Silk,   for  making  sieves,  etc.,  of  standard  weight,  40  inches  wide. 

No 2  5  7  9  11          13          15          18          20          25 

Mesh  per  linear  inch..       52          64         80          96         116        130        148        168        173        200 
Per  linear  foot 2.40      2.80      3.00      3.20      3.80      4.60      5.40      7.20    10.00    11.00 

12102.  COVERS  for  Nos.  12084  to  12096. 

Diameter,   inches 8 

Each    50  .60 

12104.  BOTTOM  PANS  for  Xos.  12084  to  12096. 

Diameter,   inches 5  8 

Each    50  .60 

12110.  SIEVES,  Bureau  of  Soils  Type,  as  employed  in  the  Laboratories  of  the  Bureau  of  Soils,  Washing- 
ton, D.  C.,  for  mecuanical  analysis.  Set  of  four  sieves  turned  from  heavy  brass  castings  with 
bottom  pan  and  cover,  each  about  2  inches  in  diameter  by  1  inch  high,  perfectly  fitted,  so  that 
the  set  may  be  well  shaken  without  coming  apart.  Shaped  so  that  there  is  no  loss  of  the 
sample,  a  great  advantage  where  small  samples  are  being  tested.  Sieves  proper  are  readily  re- 
placeable; upper  two  of  brass,  with  perforations  1  mm  and  0.5  mm  in  diameter;  lower  two  of 

bolting  cloth  64  and  130  mesh per  set     10.00 

For  Shaker  for  Xo.  12110  Sieves,  see  Xo.  12148. 

12114.  SIEVES,  Cement,  Bureau  of  Standards  Typa,  Brass  Frame,  seamless,  of  woven  brass  screen,  20 
cm  in  diameter  and  6  cm  high,  with  certificate  of  the  United  States  Bureau  of  Standards. 

No A  B 

Mesh  100  200 

Size  of  openings,  inches 0.0055  0.0029 

Each  8.00  15.00 

7398.  SIEVES,  Corn  Test,  according  to  specifications  of  the  United  States  Department  of  Agriculture. 
The  set  consists  of  one  sieve  with  14/64  inch  round  holes,  and  one  bottom  pan,  of  aluminum, 
13  inches  in  diameter  by  3  inches  deep .- 4.50 

12120.  SIEVES,  Sand,  Bureau  of  Standards  Type,  Brass  Frame,  seamless,  of  woven  brass  screen,  20  cm 
in  diameter  and  6  cm  high,  with  certificate  of  the  United  States  Bureau  of  Standards. 

No A  B 

Mesh  20  30 

Size  of  openings,  inches 0.0335  0.0223 

Each 6.25  6.25 


442 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  12140. 


Nos.  12136-7. 


No.  12128. 


No.  7402. 


No.  12148. 


12124.  SIEVES,  Standard,  Brass  Frame,  seamless,  brass  gauze,   according  to   the  specifications  of   the 
American  Society  for  Testing  Materials;    diameter,  8  inches. 

Mesh 10            20            30            40           50            60  70  80            SO  100 

Each $3.70        3.00         3.00         3.00        3.25         3.25  3.40  3.70         4.00  4.30 

Mesh 110    120    130    140    150    160  170  180    190  200 

Each 4.45    4.60    4.95    5.20    5.50    5.80  6.40  7.00    7.35  7.60 


12125. 
12128. 

7402. 


COVERS  AND  BOTTOM  PANS  for  No.  12124 per  set      2.00 

SIEVES,  Standard,  Tin  Frame,  seamless,  brass  gauze,  similar  to  No.  12124,  but  nested  in  set  of  8, 
from  5  to  8%  inches  in  diameter  consisting  of  one  each  10,  20,  30,  40,  50,  80,  100  and  200  mesh 
24.00 

SIEVES,  Wheat  Dockage,  according  to  Government  specifications,  a  set  of  four  sieves,  13  inches 
in  diameter,  and  bottom  pan,  constructed  of  aluminum,  telescoping.  Consists  of  a  buckwheat 
sieve  with  8/64  inch  triangular  perforations;  a  fine  seed  sieve  with  1/12  inch  round  perfora- 
tions; a  scalper  sieve  with  12/64  inch  round  perforations;  and  a  chess  sieve  with  perforations 
41/£/64  by  Vs  inch.  (See  Regulatory  Announcement  No.  2  of  Federal  Wheat  Grades  Effective 
July  1  and  August  1,1917) 8.00 

SIEVES,  Wood  Frame,  brass  gau/e. 

Mesh   20  40  60  80  100  200 


12136, 
12137, 
12140 


Each,  6  inches  in  diameter 50 


Each,  8  inches  in  diameter. 


.60 


.60 
.65 


.75 
.80 


.90 
1.00 


1.10 
1.25 


3.20 
3.50 


SIEVES,  Wood  Frame,  consisting  of  a  heavy  wooden  frame  provided  with  a  slot  in  which  may 
be  placed  bottoms  of  perforated  steel,  and  hinged  at  one  end  to  facilitate  removal  and  replace- 
ment of  these  metal  bottoms.  Inside  dimensions  of  frame,  17%  x  14  x  5  inches.  Ten  bottoms 
are  included  with  perforations  of  %,  *4,  %,  %,  1,  1*4, 1%,  2,  2%,  and  3  inches 18.00 

12148.  SIEVE  SHAKER,  for  Power,  for  use  with  No.  12110  Sieves.  A  motor  of  1/20  h.  p.  is  mounted 
on  the  same  base  with  an  eccentric  shaft,  to  which  it  is  belted.  The  set  of  sieves  is  clamped 
in  a  frame  at  the  end  of  a  long  lever  arm  which  rests  on  the  eccentric.  This  lever  arm  is  so  at- 
tached to  the  eccentric  that  with  each  revolution  of  the  cam  the  sieves  are  struck  sharply,  raised 
and  dropped  with  a  motion  similar  to  that  used  in  shaking  by  hand.  Without  sieves.  (See 
Bulletin  No.  84,  United  States  Department  of  Agriculture,  Bureau  of  Soils.) 

No A                  B  C                  D 

A.C.  D.C. 

For  volts 110  220  110  220 

Each    50.00  51.00  45.00  46.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  II.  S.  A. 


443 


Nos.  12152-3. 


1J].")L'.  SIEVE  SHAKER,  Ro-Tap,  Electrically  Driven.  This  machine  reproduces  the  circular  and  tapping 
motions  of  hand  sieving,  with  a  uniform  mechanical  action,  which  produces  reliable  results  and 
standardizes  laboratory  methods.  Ruggedly  constructed  with  heavy  base  and  substantial  sup- 
porting columns.  Running  parts  operate  in  oil.  By  means  of  No.  12153  Stop-Rite  Time  Switch, 
the  process  may  be  made  entirely  automatic,  as  the  switch  may  be  set  for  any  desired  time 
interval,  and  the  test  will  be  automatically  stopped  at  the  end  of  that  time.  Capacity  of  the 
machine,  6  standard  height  8  inch  sieves  with  bottom  pan,  or  13  half  standard  height  sieves 
with  bottom  pan.  Complete  with  direct  connected  110  volt  motor,  but  without  sieves  or  Stop- 
Kite  Time  Switch.  No A  B  CD 

A.C.  D.C 

For  volts  . .». 110  220  110  220 

Each   $200.00  205.00  200.00  200.00 

12153.  STOP-RITE  TIME  SWITCH,  for  use  with  No.  12152  Ro-Tap  Sieve  Shaker.  May  be  set  for  any 
desired  interval  and  will  automatically  stop  machine  at  the  end  of  the  pre-determined  period 

20.00 

12158.  SIFTER,  Lightning  No.  0,   for  hand  power.    Complete  with  one  sieve  of  any  mesh  up  to  50  9.00 

In  ordering,  kindly  state  mesh  of  sieve  desired. 

12166.  SILICA  RODS,  Opaque  Fused  Silica,  for  use  in  stirring  fusions  and  high  temperature  mixtures. 
In  lengths  up  to  5  feet. 

Diameter,    mm 1-2  3  4-5          6-7  8  9-10 

Per  foot 50  .63  .94         1.25         1.56         1.75 

SILICA  TUBING,  Opaque  Fused  Silica,  glazed  at  the  ends  and  smooth  inside.     Sizes  up  to  % 

inch  have  satin  finish.     Very  resistant  to  sudden    changes    of    temperature.      For    combustion 

work,  the  glazed  Combustion  Tubing  No.  3186  glazed  inside  and  outside  and  gas  tight  should 

be  selected.    In  lengths  up  to  8  feet. 

In  ordering  specify  diameter  and  thickness  of  wall. 


12168. 
12169. 

12174. 
12180. 


Diameter,  inside,  mm..        3  4-5  6-7  8  9-10  12-13  15-16        19  22 

Thickness  of  wall,  mm.    .5-2.5  .5-2  .5-2  .5-2  1-2  1-2  1-2.5  1-3  1-3 

Per   foot 56  .94  1.13  1.38  1.88  1.88  2.19  2.63  2.88 

For  one  end  closed,  per 

tube,   add 19  .25  .25  .25  .31  .31  .44        .63  .81 

SILK,  Oiled,  in  sheets  12x14  inches,  each  in  a  box Per  sheet 

SIPHONS,  Glass,  plain  form. 


No. 


Length  of  delivery  tube,  inches 

Each 

12182.  SIPHONS,  Glass,  with  suction  tube. 

No 

Length  of  delivery  tube,  inches 

Each 

12184.  SIPHONS,  Glass,  with  suction  tube  and  stopcock. 

No 

Length  of  delivery  tube,  inches 

Each  .  


A 
12 
.40 

A 
12 

.70 

A 

12 

2.50 


B 
18 
.50 

B 
18 
.80 

B 

18 
2.75 


25 

1-3 

3.13 

.94 

.45 

C 
24 
.60 

C 
24 
.90 

C 

24 
3.00 


444 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  12196. 


No.  12200. 


SLEEVES,  see  Aprons,  Oversleeves  and  Laboratory  Coats. 
SLIDES,  Microscopic,  see  Microscope  Accessories. 
SLIDE  BOXES,  see  Microscope  Accessories. 

12190.  SLIDE  RULE,  Woodworth,  a  simple  machine  for  multiplying  and  dividing.  It  is  printed  on 
heavy  bristol  board,  ready  for  the  student  to  cut  and  fit  together.  Recommended  by  the  Cen- 
tral Association  of  Science  and  Mathematics  Teachers Each  $0.10 

Per  dozen      1.00 

12192.  SLIDE  RULE,  Mannheim,  10-inch,  graduations  on  white  paper,  with  a  protective  coating, 
mounted  on  hardwood 1.40 

12194.    SLIDE  RULE,  Mannheim,  fine  quality,  10-inch,  in  case  with  book  of  instructions 4.00 

12196.  SLIDE  RULE,  Multiplex,  10-inch,  useful  in  solving  all  arithmetical,  trigonometrical,  and  log- 
arithmetical  problems  which  are  possible  with  the  Mannheim,  and  has  also  the  following  char- 
acteristic advantages:  Multiplication  of  three  numbers  in  one  setting;  division  of  one  number 
by  two  numbers  in  one  setting;  more  convenient  solution  of  inverse  proportion;  direct  solu- 
tion in  a  single  setting  of  a  series  of  divisions  with  constant  dividend;  direct  reading  of  cubes 
and  cube  roots;  direct  reading  of  three-halves  and  two-thirds  powers;  direct  solution  in  a 
single  setting  of  many  combined  operations.  In  case  with  book  of  instructions 6.25 

12200.  SLIDE  RULE,  Chemists'  Duplex,  10  inches  in  length,  engine  divided.  The  rule  carries  138 
chemical  symbols  which  include  the  common  acids,  bases,  salts,  oxides,  and  elements  em- 
ployed by  the  average  chemist.  As  each  symbol  has  its  individual  position  corresponding 
to  the  logarithm  of  its  molecular  weight,  the  number  of  permutations  and  combinations  pos- 
sible covers  the  requirements  of  almost  any  problem.  By  using  the  logarithmic  and  cologarith- 
mic  scales  in  conjunction  with  the  chemical  gage  points,  problems  in  Stoichiometry,  such  as 
Gravimetric  Analysis,  Volumetric  Analysis,  Equivalents,  Percentage  Composition,  Conversion 
Factors,  Volume  of  Gas  from  a  given  weight  of  substance  at  different  temperatures  and  pres- 
sures, and  many  other  analogous  problems  are  readily  solved.  Aside  from  the  solution  of  the 
chemical  problems  above  referred  to  any  arithmetical  problems  solvable  by  logarithms  are 
readily  and  accurately  done  with  a  minimum  number  of  settings.  With  glass  indicator,  in 
morocco  covered  case  with  full  directions 8.00 

SNIPS,  Tinners',  see  Shears. 

12210.  SOAP,  Green  Oil,  U.  S.  P.  Quality,  a  soft  soap  of  potash  base  with  strongly  detergent  properties. 
Widely  used  for  antiseptic  purposes  in  connection  with  surgical  and  bacteriological  work. 
Useful  for  many  purposes  around  the  chemical  laboratory,  such  as  cleaning  glass  and  porce- 
lain, desk  tops,  sinks,  stained  hands,  etc.  In  concentrated  form,  for  solution  in  water. 

No A  B  C 

Style   package jar  can  pail 

Weight,    pounds 1  2  5 

Each   60  .95  1.90 

SOAP,  Palm  Oil,  see  No.  8952. 
SODIUM  SPOONS,  see  Spoons,  Sodium. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


445 


No.  12228. 


No.  12234. 


SOIL  ANALYSIS  APPARATUS 

INCLUDING  APPARATUS  FOR  PHYSICAL  PROPERTIES  OF  SOILS 

(Arranged  Alphabetically.) 

12220.  ABSORPTION  APPARATUS,  Heat,  for  absorption  of  heat  by  soils,  as  described  by  Steven- 
son &  Schaub.  This  apparatus  is  nsed  to  compare  the  temperatures  of  various  soils  at  differ- 
ent depths  when  the  soils  are  exposed  to  the  direct  rays  of  the  sun,  and  consists  of  four  zinc 

boxes  4x4x8  inches  deep,  enclosed  in  a  wooden  box  open  at  the  top $5.00 

12222.  ABSORPTION  APPARATUS,  Moisture,  for  determining  the  power  of  dry  soils  to  absorb  hygro- 
scopic moisture  from  a  saturated  atmosphere.  A  water-tight,  water-proofed  substantial 
wooden  box  with  heavy  cover  so  designed  that  it  may  be  clamped  air-tight  to  the  box.  (A 
metal  box  is  not  satisfactory,  because  it  is  so  affected  by  temperature  conditions  that  the 
results  obtained  have  little  or  no  value.)  Wooden  strips,  not  shown  in  the  illustration,  sup- 
port the  soil  pans  and  have  a  device  for  holding  the  strips  of  absorption  paper  which  by 
capillary  action  absorb  water,  keeping  the  air  within  the  box  in  a  saturated  condition.  Com- 
plete with  six  soil  pans 17.50 

SOIL  PAN  of  zinc,  6%x6%xl%  inches,  as  used  in  Xo.  12222  Absorption  Apparatus.  These  pans 
are  water-tight  and  will  be  found  convenient  for  use  in  drying  ovens.  Each 30 

ASPIRATOR,  McCall,  for  studying  the  rate  of  the  flow  of  water  through  soils  of  different  tex- 
tures. This  aspirator  has  no  moving  parts  to  cause  errors  from  friction  and  the  method  of 
operation  is  exceedingly  simple.  The  bottle  is  first  filled  with  water  to  a  definite  mark  on 
the  scale  and  connections  are  made  as  shown  in  the  illustration.  The  pincheock  is  then 
opened  and  water  allowed  to  run  from  the  bottle  until  it  stands  at  a  much  lower  level.  By 
noting  the  time  required  with  different  soils,  the  relative  rate  of  flow  is  readily  determined. 
Complete  as  illustrated,  with  metal  support,  but  without  soil  tube  or  beaker 8.00 

SUPPORT  only  of  No.  12228 3.00 

ASPIRATOR  BOTTLE  only  of  No.  12228.  Complete  with  rubber  stoppers,  rubber  tubing,  and 
pincheock 5.00 

ASPIRATOR,  for  determining  the  comparative  porosity  of  soils  by  measuring  the  rate  of  flow 
of  air  through  them  under  constant  pressure.  This  apparatus  consists  essentially  of  a  closed 
pressure  chamber  formed  by  a  rubber  diaphragm  or  bag  placed  between  a  movable  weight 
and  a  wooden  base  15  inches  in  diameter.  To  the  weight  is  attached  a  graduated  rod,  by 
reference  to  which  definite  quantities  of  air  may  be  forced  through  the  different  soils  under 
consideration.  The  pressure  chamber  is  enclosed  in  a  suitable  casing  for  protection..  17.50 


12223. 

12228. 


12229. 

12230. 

12234. 


446 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  12238. 


No.  12242. 


AUGERS,  see  Soil  Sampling  Apparatus. 

BINS  OE  CONTAINERS  for  Soil,  see  general  heading  Bins  or  Containers. 

12238.  BOTTLE,  Mechanical  Analysis,  convenient  for  separating  soils  into  their  constituent  parts,  as 
described  in  Hosier  and  Gustaf son's  "Soil  Physics  Laboratory  Manual."  Complete  with  in- 
verted rubber  stopper  and  tubes $0.75 

CARBONIC  ACID  APPARATUS,  see  general  heading  Carbon  Dioxide  Determination  Apparatus. 

12242.  CENTRIPUGE,  Soil,  for  preparing  soil  samples  for  Mechanical  Analysis.  This  machine  is  of 
excellent  design,  having  features  suggested  by  agronomists.  The  motor  is  mounted  with  shaft 
vertical,  thus  obviating  considerable  vibration  and  allowing  easy  access  to  the  soil  tubes.  A 
brass  trunnion  arm,  mounted  on  this  shaft,  carries  eight  soil  tubes,  which  are  of  heavy  well 
annealed  glass  and  are  encased  in  aluminum  sheaths.  These  sheaths  are  held  in  trunnions  to 
the  trunnion  arm  by  hardened  steel  bearings.  The  whole  is  protected  by  a  metal  covering, 
which  extends  to  the  floor  or  table  on  which  the  motor  rests,  access  to  motor  and  tubes  being 
gained  by  means  of  a  hinged  cover. 

Complete  with  %  h.  p.  motor,  of  1800  r.  p.  m.  no  load  speed,  ready  for  mounting  on  a  table  top, 

and  eight  soil  tubes.      No A  B  C  D 

A.C.  D.C. 

For  volts 110  220  110  L'i'O 

Each    100.00        95.00        110.00 


12243.  EXTRA  SOIL  TUBES,  heavy  glass,  as 

used  in  No.  12242 each         .15 

per  dozen      1.50 

12246.  CENTRIFUGES,  International,  Electric, 
with  equipment  for  mechanical  analysis 
of  soils,  including  speed  control  rheo- 
stat; No.  2685  Eight-tube  Head;  eight 
No.  2710  Metal  Tubes,  100  cc,  with  No. 
2711  Trunnion  Kings;  eight  No.  2718 
Eubber  Cushions;  72  No.  2716  Plain 
Glass  Tubes,  100  cc;  and  an  8-tubo 
Hack.  Dimensions:  23  inches  high, 
closed;  35  inches  high,  open;  and  24 
inches  in  diameter,  with  a  shipping 
weight  of  about  300  pounds. 

No A          B          C          D 

A.C.  D.C. 

For  volts  . .       110      220        110    220 
Each    138.00  138.00  108.00  108.00 

2716.  TUBES,  Glass,  plain,  lipped,  100  cc,  for 
No.  12246  Centrifuge,  .per  dozen  $2.30 


No.  12246. 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


447 


No.  12252. 


12252.  CENTRIFUGES,  Moisture  Equivalent,  Briggs-McLane,  as  described  in  the  Proceedings  of  the 

American  Society  of  Agronomy,  Volume  2,  1910. 

This  centrifuge  is  used  for  determining  the  relative  moisture  equivalents  of  soils  where  the 
term  moisture  equivalent  designates  the  maximum  percentage  of  moisture  which  a  soil  can 
retain  in  opposition  to  a  known  centrifugal  force.  For  a  standard  of  comparison,  a  centrif- 
ugal force  equal  to  1,000  times  the  force  oi  gravity  has  been  adopted.  In  making  the  deter- 
minations, the  soils,  suitably  moistened,  are  placed  in  cups  with  perforated  bottoms.  These 
cups  are  then  placed  in  the  cylinder  of  the  centrifuge  and  rotated  at  a  constant  speed,  so 
chosen  as  to  develop  the  required  centrifugal  force.  "Each  soil  now  loses  water  until  the 
capillary  forces  have  increased  sufficiently  to  balance  the  centrifugal  force  acting  on  the 
soil  moisture.  Since  the  moisture  content  of  each  soil  which  has  been  treated  in  this  way 
is  in  capillary  equilibrium  with  the  same  force,  it  follows  that  if  these  moist  soils  are  placed 
in  contact  in  any  order  whatever  no  movement  of  water  from  one  soil  to  another  will  take 
place.  A  condition  of  complete  equilibrium  exists  throughout  the  series  of  soils  thus  treat- 
ed." It  is  then  necessary  only  to  determine  the  moisture  content  of  each  soil  correspond- 
ing to  this  condition  of  equilibrium  in  order  to  determine  its  quantitative  position  in  the 
scale  of  moisture  retentiveness.  The  centrifuge  here  described  is  capable  of  maintaining  the 
required  centrifugal  force  well  within  the  desired  limit  of  accuracy. 

The  instrument  consists  of  a  bronze  disk  cylinder  containing  16  soil  boxes  with  wire  gauze 
bottoms,  and  attached  to  the  shaft  of  a  vertically  mounted  D.  C.  motor.  The  motor  is  pro- 
vided with  a  Kellogg  Constant  Speed  Governor  and  a  Frahm  Tachometer  (not  shown  in  the 
illustration)  is  supplied  which  has  a  range  from  2380  to  2500,  thus  bringing  the  desired  point 
of  speed,  2440  r.  p.  m.,  about  the  middle  of  the  dial.  If  alternating  current  only  is  avail- 
able, a  motor-generator  set  should  be  used  to  produce  the  direct  current  necessary.  See 
Nos.  4824  to  4848.  Complete  as  described. 

Xo A  B 

For  volts   110  220 

Each    $285.60       285.60 

For  other  CENTRIFUGES,  see  general  heading  Centrifuges. 
COLORIMETERS,  see  general  heading  Colorimeters. 

1225fi.  COMPACTING  MACHINE,  designed  for  obtaining  uniform  compaction  of  soils  in  tubes  18 
inches  or  less  in  length  and  four  inches  or  less  in  diameter.  It  consists  of  two  uprights  hav- 
ing sockets  at  their  lower  ends  for  attachment  to  the  floor  and  a  cross  bar  with  wall  attach- 
ments at  their  upper  ends.  A  cross  bar  fastened  rigidly  to  these  uprights  carries  a  rotating 
tube  socket  or  holder  which  is  rotated  by  means  of  a  crank.  Twice  during  each  revolution 
the  tube  is  raised  to  the  height  of  *4  inch  by  means  of  inclined  surfaces  under  the  tube 
holder,  and  automatically  dropped,  which  process  jars  the  soil  into  position.  A  small  propel- 
ler is  attached  to  the  end  of  the  rod  extending  down  from  the  sliding  cross  bar.  This  pro- 


448 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  S.  A. 


No.  12268 


No.  12264  v^- tj  No   12272_ 

COMPACTING  MACHINE,  Continued. 

peller  is  placed  at  the  bottom  of  the  tube  to  be  filled  and  soil  then  poured  into  the  tube. 
Twice  during  each  revolution  it  drops  with  the  soil  tube,  thus  striking  a  definite  number  of 
blows  on  the  soil  column  as  it  rises. 

This  compactor  is  built  to  compact  soils  to  approximately  the  same  condition  in  which  they 
are  found  in  the  fields  and  to  give  uniform  compaction  for  comparative  tests.  It  is  simple 
in  principle  and  does  its  work  quickly  and  easily.  With  two  propellers  (one  for  2-inch  tubes 
and  the  other  for  4-inch  tubes),  weight  holder,  and  weights $30.00 

12258.  COMPACTOE,  Spring  Board,  necessary  for  compacting  soils  in  glass  tubes.  Base  of  wood  8x24 
inches;  spring  board  firmly  fastened  to  base  at  one  end;  massive  slip-weight  slides  on  nickel- 
plated  rod.  A  very  substantial  and  well-finished  piece  7.00 

12262.  CONDUCTIVITY  APPARATUS,  for  determining  the  thermal  conductivity  of  soils.  This  design 
has  been  modified  from  the  original  design  in  use  at  the  University  of  Illinois  Soils  Labora- 
tory. A  galvanized  iron  soil  tray,  16x4x5  inches,  has  at  one  end  a  water-tight  boiling  tank, 
4x4x5  inches.  Attached  to  this  tank  is  a  heating  coil,  as  shown  in  the  illustration,  by  which 
the  water  in  the  tank  can  be  kept  at  the  boiling  point  indefinitely.  By  this  method  of  heat- 
ing, the  errors  present  in  the  old  apparatus  due  to  direct  heating  from  the  flame  are  entirely 
avoided.  The  boiling  tank  is  provided  with  tubulatures  for  thermometer  and  for  reflux  con- 
denser which  may  be  used  if  desired.  Complete  as  illustrated 6.00 

32264.  CONDUCTIVITY  APPARATUS,  similar  to  No.  12262,  but  without  heating  coil  and  with  an 
electrical  heating  unit.  This  method  of  heating  was  suggested  by  the  Department  of  Soil 
Technology  of  the  New  York  State  College  of  Agriculture  at  Cornell  University  and  has 
proved  very  satisfactory.  For  110-volt  current,  either  alternating  or  direct.  Power  consumed, 

350  watts  11.00 

For  CONDUCTIVITY  BRIDGE,  see  No.  12400. 

12268.  DIGESTION  CUP,  porcelain,  for  acid  digestion  of  soils  (Hilgard's  Method).      Capacity,  50  cc       .35 
DISHES,  Moisture,  see  general  heading  Dishes. 

12272.  DRAINAGE  AND  WATER  TABLE  APPARATUS,  Graham  &  McCall's,  designed  to  show  the 
behavior  of  capillary  and  free  water  in  the  soil,  and  the  principles  involved  in  the  proper 
construction  of  a  barnyard  to  prevent  loss  of  plant  food;  of  copper,  3x6x12  inches  high,  with 
a  solid  bottom  to  represent  hard  clay  or  stone.  Through  the  vessel  are  two  brass  tubes,  sawed 
transversely,  which  communicate  with  the  outside,  representing  tile  drains  at  different  depths. 
A  standpipe  shows  the  height  of  free  water  inside  the  vessel. 

To  operate,  fill  the  vessel  with  soil  and  pour  on  water  at  regular  intervals,  giving  it  time  to 
soak  into  the  soil.  The  water,  instead  of  coming  out  at  the  tubes,  will  pass  downward  through 
the  soil  until  the  solid  bottom  is  reached,  when  a  water-table  of  free  water  will  be  formed 
at  a  height  indicated  by  the  free  water  in  the  glass  standpipe.  When  the  free  water  has  risen 
to  the  first  opening  it  will  pass  outside  the  vessel,  thus  proving  that  a  tile  drain  placed  as 
low  as  soil  conditions  will  permit  removes  free  water  before  one  placed  not  so  deep. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


449 


No.  12278. 


No.  5644. 


No.  12282. 


No.  12286. 


No.  12276. 


DRAINAGE  AND  WATER  TABLE  APPARATUS,  Continued. 
Some  Things  Which  the  Apparatus  Will  Show: 

Tile  drains  do  not  remove  capillary  water.    A  deep  drain  removes  the  first  water. 

Xo  water  is  removed  until  the  soil  at  the  drain  line  is  beyond  the  point  of  saturation. 

The  volume  of  soil  available  for  plant  food  is  greater  in  a  drained  soil. 

The  volume  of  soil  retaining  capillary  water  is  greater  where  the  drains  are  deep. 

Plant  food  would  not  be  wasted  by  leaching  from  a  barnyard  having  a  tight  floor  of  elay  or 
cement  and  some  kind  of  retaining  wall  around  the  outside $7.50 

DRYING  OVENS,  see  general  heading  Ovens. 
5644.     ELUTRIATING  FLASK,  Benningsen's.     The  bulb  has  a  capacity  of  about  400  cc,  and  the  neck 

is  graduated  to  40  cc  in  1  ce  divisions 1.50 

12270.  EVAPORATION  GAGE,  micrometer  screw  form,  for  measuring  rate  of  evaporation,  as  described 
in  Bigelow's  "Manual  for  Observers  in  Climatology  and  Evaporation"  (TJ.  S.  Weather  Bu- 
reau Xo.  409).  A  micrometer  screw  is  mounted  on  a  cap  suitable  for  supporting  it  on  the 
top  of  a  still  well  3  inches  in  diameter.  The  screw  proper  is  5  inches  long  with  20  threads  to 
the  inch.  The  micrometer  head  is  graduated  in  50  divisions  so  that  readings  may  be  taken  to 
*iooo  °f  an  inch.  For  convenience  in  reading  a  linear  scale  graduated  in  20ths  of  inches  is 
provided.  The  total  distance  from  the  head  to  the  end  of  the  pointer,  which  is  of  incorrod- 
ible material,  is  12  inches.  The  pointer  may  be  unscrewed  and  a  hook  screwed  in  its  place, 
thus  making  the  instrument  serve  as  a  hook  gage.  Complete  as  described,  with  pointer  and 

hook    12.00 

1227S.  EVAPORATION  TANK  for  use  with  Xo.  12276  Evaporation  Gage,  of  heavy  galvanized  iron 
6  feet  in  diameter  by  2  feet  deep.  A  still  well  3  inches  in  diameter  is  firmly  attached  to  one 
side  of  the  tank  and  connected  with  the  tank  at  the  bottom  by  a  galvanized  pipe  of  sufficient 
size  to  allow  free  flow  of  water  between  the  tank  and  still  well 50.00 

Note. — Tanks  of  different  dimensions  can  be  furnished  if  desired. 

12282.  EVAPORIMETER,  for  determining  the  amount  of  water  evaporated  from  the  surface  of  various 

soils  in  a  given  time;  for  determining  the  effect  on  evaporation  produced  by  different  fertil- 
izers, and  different  methods  of  cultivation.  It  consists  of  a  brass  tube  4  inches  in  diameter 
and  9  inches  long  having  a  perforated  metal  bottom  to  allow  free  ingress  of  water.  This  tube 
fits"  into  a  water-tight  spun  brass  base. 

In  operation  the  tube  is  filled  with  soil  which  is  compacted  by  means  of  the  Soil  Compacting 
Machine  (Xo.  12256).  It  is  then  placed  in  position  in  the  base.  Water  of  known  weight  is 
placed  in  the  base  whence  it  passes  through  the  perforated  bottom  of  the  tube  to  the  soil 
and  is  evaporated  from  its  surface. 

The  apparatus  is  entirely  of  brass,   durably  made,  highly  polished  and  lacquered 5.00 

12283.  EVAPORIMETER,  same  as  Xo.  12282,  but  with  brass  tube  18  inches  long 5.50 

12286.  EVAPORIMETER,   for  finding   the   co-efficient  of  evaporation  from  soils.     The  soil  container  is 

of  copper  with  brass  bottom  perforated  with  one  millimeter  circular  openings.  This  container 
is  placed  in  a  copper  water  jacket  3x8  inches  3.50 


450 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


No.  12290. 


No.  12298. 


No.  12302. 


No.  12308. 


FILTERS,   Soil,   see  general  heading  Filtering  Apparatus. 
FURNACES,  Muffle,  see  general  heading  Furnaces. 

12290.  LIMESTONE  TESTER,  Hopkins,  for  determining  the  purity  of  limestone.  The  outfit  consists 
of  two  glass  vessels  joined  together,  one  for  holding  the  limestone  sample,  the  other  for  the 
charge  of  acid.  The  apparatus  is  light  and  easily  weighed.  (See  Bulletin  No.  194  of  the  Uni- 
versity of  Illinois  Agricultural  Experiment  Station) $3.50 

For  other  LIMESTONE  TESTERS,  see  Carbon  Dioxide  Determination  Apparatus. 
MICROSCOPES,  see  general  heading  Microscopes. 
MILLS,  Grinding,  see  Crushing  and  Grinding  Apparatus. 
MOISTURE  DISHES,  see  general  headings  Boxes,  Dishes. 

12298.  MULCH  CYLINDER,  McCall's,  for  determining  the  effect  of  mulches  upon  the  rate  of  evapora- 
tion from  soils.  Design  as  illustrated;  of  galvanized  iron,  19  inches  high;  approximate  diam- 
eter at  top  4  inches;  at  bottom  8  inches 2.80 

12300.  MULCH  CYLINDER,  McCall's,   same  as  No.  12298,  but  29  inches  high 3.00 

12302.  MULCH  CYLINDER,  Stevenson  &  Schaub's,  of  galvanized  iron  11  inches  in  diameter  by  13  inches 

high,  with  water  supply  tube 1.60 

NITROGEN  DETERMINATION  APPARATUS,    see    general    heading    Nitrogen    Determination 

Apparatus. 

12308.  ORGANIC  MATTER  DETERMINATION  APPARATUS,  for  determination  of  organic  matter 
in  soils  by  the  wet  combustion  method.  Consists  of  two  flasks,  two  Mohr-Geissler  Potash 
Bulbs,  one  Peligot  Tube,  two  Winkler  's  Spiral  Potash  Bulbs,  Condenser,  Dropping  Funnel,  rub- 
ber stoppers  and  connecting  tubes.  (See  Bulletin  24,  U.  S.  Bureau  of  Soils) 13.50 

10932.     POTASH  TUBE,  Peligot  (A) 40 

10938A.  POTASH  BULB,  Winkler's,  100  mm  (B) 2.00 

10916.    POTASH  BULB,  Mohr-Geissler  (C) 1.50 

5550B.  FLASK,  Potassium  Hydrate,  200  cc  (D) 22 

5550C.  FLASK,  Round  Bottom,  300  cc  (E) 28 

6160B.  FUNNEL.  Separatory,  60  cc  (F) 1.45 

3224C.  CONDENSER,  15  inch  (G) 1.40 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


451 


No.  12324. 


No.  12336. 


12314. 
12316. 


12318 
12324 


ORGANIC  MATTER  JAR.  A  1-gallon  glass  jar  provided  with  a  round  hole  for  drainage,  1  cm 
in  diameter,  located  1  cm  above  the  bottom  $0.75 

PAN,  of  metal,  water  tight,  4^4x4*4x1%  inches.    For  use  in  Drying  Ovens 25 

PAN,  of  zinc,  6^x6^x1%  in.,  as  used  in  No.  12222  Absorption  Apparatus.  These  pans  are 
water  tight  and  will  be  found  convenient  for  use  in  drying  ovens 30 

PAN  or  BOX,  of  zinc,  4x4x4  inches,  for  volume-weight  experiments 50 

SAMPLE  CANS  OR  BOXES,  see  general  heading  Boxes. 

PENETROMETER,  for  determining  the  firmness  of  soil  due  to  its  cohesion,  by  means  of  the 
resistance  offered  to  the  introduction  of  a  sharp  instrument.  The  apparatus  is  essentially  as 
described  in  the  Bulletin  referred  to,  but  is  supplied  with  a  device  for  making  electrical  con- 
tact when  the  soil  has  been  penetrated  to  the  desired  depth,  as  suggested  by  Prof.  Charles  F. 
Shaw  of  the  University  of  California.  Complete  as  illustrated.  (See  Bulletin  No.  50,  Bureau 

of  Soils)  50.00 

12328.  PERCOLATION  APPARATUS,  McCall's,  for  determining  percolation  of  water  through  soils. 
Glass  percolator,  1%  pint,  with  brass  extension  having  lateral  tubes.  Complete  with  rubber 
gasket,  copper  gauze,  etc 6.50 

PERCOLATORS,  see  general  heading  Percolators. 

PESTLE,  Rubber,  for  preparing  soils  for  analysis;  7  inches  long,  wood  handle  with  rubber 
tip  30 

PLASTICITY  APPARATUS,  for  determining  the  effects  of  lime  on  plastic  soils.  Consists  of  a 
clamp  with  two  knife  edges  about  4  inches  apart,  across  which  the  briquet  to  be  tested  is 
placed  for  breaking,  a  heavy  canvas  bag  for  holding  weights  and  shot  and  one  No.  12337 
Mold,  5  inches  long,  1  inch  wide  and  %  inch  deep,  as  illustrated.  For  those  who  wish  a  mold 
of  more  accurate  dimensions,  the  purchase  of  No.  12338  Mold  is  recommended.  (This  design 
has  been  developed  from  the  original  in  use  at  the  University  of  Illinois,  in  co-operation  with 
the  Soil  Physics  staff  of  the  University) • 2.50 

MOLD  only  o'f  No.  12336 ., 25 

MOLD,  improved  form,  for  No.  12336,  as  suggested  by  A.  F.  Gustafson  of  the  University  of 
Illinois.  Of  cast  brass,  accurately  milled  to  shape.  All  molds  are  therefore  identical  and 
always  occupy  the  same  position  on  the  table,  so  that  the  bricks  of  soil  obtained  are  accurate 
and  uniform  in  shape.  Inside  cross  section  %  square  inch,  length,  5  inches 1.00 


12332 
12336 


12337. 
12338. 


452 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  12342-3. 


Nos.  12346-8. 


No.  12350.  No.  12351. 


No.  12354. 


SOIL  SAMPLING  APPARATUS 


12342. 


12343. 
12346. 


12348. 
12350. 


12351. 
12352. 
12354. 


SOIL  AUGER  for  obtaining  soil  samples.  Length  36  inches  with  graduations  every  6  inches; 
handle  detachable;  steel  cutting  edge  1%  inches  in  diameter.  The  length  may  be  increased 
to  72  inches  by  the  insertion  of  No.  12343  Extension.  Complete  with  handle  but  without 
additional  length $3.50 

EXTENSION  of  36  inches  for  use  with  No.   12342 1.00 

SOIL  AUGER,  improved  form  with  stem  and  handle  of  smooth  finished  steel.  The  handle  is 
attached  by  means  of  a  lock  nut  of  new  design  which  entirely  does  away  with  the  loosening 
and  tightening  up  at  the  joint  which  has  caused  so  much  difficulty  in  the  earlier  types  of  Soil 
Augers.  This  Auger  has  been  made  24  inches  long  for  convenience  in  carrying  when  in  the 
field.  For  use  at  greater  depths  extensions  2  feet  long  and  4  feet  long  have  been  provided. 
(See  Nos.  12351  and  12352.)  The  auger  bit  is  1%  inches  in  diameter  and  the  stem  is  gradu- 
ated every  6  inches.  This  is  a  thoroughly  high-grade  tool  for  the  most  exacting  service  7.50 

SOIL  AUGER,  same  as  No.  12346  but  with  auger  bit  2  inches  in  diameter 9.00 

SOIL  AUGER,  with  Sleeve,  for  use  in  dry  soils.  This  Auger  is  the  same  as  No.  12346  except 
that  it  is  provided  with  a  steel  sleeve  wh.ch  fits  over  the  auger  bit,  resting  on  a  projection  at 
the  lower  end  so  that  the  diameter  of  the  cutting  edges  is  larger  than  the  outside  diameter 
of  the  sleeve.  This  sleeve  is  held  firmly  in  position  at  the  upper  end  by  an  ingenious  lock- 
ing device  and  serves  to  hold  in  position  the  dry  soil  which  otherwise  would  not  cling  to  the 
Auger  when  removed  from  the  ground.  2  feet  long,  graduated  every  6  inches.  Complete  with 
sleeve  and  handle 9.00 

EXTENSION,  for  use  with  Nos.  12346  to  12350  Soil  Augers.  Complete  with  lock  nut.  Exactly 
24  inches  long  and  graduated  every  6  inches 3.00 

EXTENSION,  for  Nos.  12346  to  12350  Soil  Augers.  Same  as  No.  12351  but  exactly  48  inches 
long  4.00 

SOIL  AUGER,  Nebraska  Design,  designed  for  general  work  in  soil  investigation;  especially 
adapted  to  work  where  samples  at  exact  depths  are  desired,  since  with  this  instrument  it  is 
possible  to  secure  samples  of  soil  one  inch  in  thickness  to  a  total  depth  of  two  feet.  This  type 
of  auger  has  been  used  with  satisfactory  results  by  the  Nebraska  Agricultural  Experiment 
Station  in  securing  samples  of  soil  for  chemical  analysis  and  soil  moisture  studies.  The  auger 
is  also  well  adapted  for  use  in  making  determinations  of  the  apparent  specific  gravity  of 
soils  under  field  conditions,  since  a  definite  volume  of  soil  may  be  removed  without  the  neces- 
sity of  digging  around  a  tube  and  cutting  the  soil  off  even  with  the  lower  edge. 

In  use  the  auxiliary  tube  is  driven  into  the  soil  to  such  a  depth  that  when  the  auger  blade 
is  just  resting  on  the  surface  of  the  soil,  the  adjustable  gage  may  be  set  in  the  first  notch  on 
the  auger  stem,  and  at  the  same  time  rest  on.  the  top  of  the  tube.  The  gage  is  then  raised 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


453 


No.  12356. 


No.  12362. 


Nos.  12370-2. 


No.  12360. 


No.  1878. 


to  the  next  notch  and  the  auger  turned  until  the  gage  again  conies  in  contact  with  the  top  of 
the  tube,  or,  in  other  words,  has  removed  one  inch  of  soil,  since  the  notches  are  one  inch 
apart.  In  this  manner,  a  sample  of  soil  from  each  inch  may  be  obtained  to  a  depth  of  2 
feet.  Complete  with  auxiliary  tube .' 9.00 

12356.  SOIL  AUGER,  Pugh's.    According  to  Dupont  specifications  this  anger  is  especially  designed  for 

use  in  hard  ground,  and  is  the  best  tool  on  the  market  for  penetrating  the  hard  pan.  It  is 
hand-made  out  of  special  steel,  and  actual  tests  made  in  all  parts  of  the  world  have  proved 
that  one  Pugh  will  outwear  and  outbore  a  dozen  or  more  of  any  other  make.  Useful  for  soil 
sampling,  tree  planting,  ditching,  drainage  and  other  earth  boring  where  deep  holes  are  re- 
quired, or  where  the  ground  is  hard.  With  extensions  it  can  be  lengthened  so  as  to  reach  to 
any  desired  depth;  it  is  used  very  extensively  for  prospecting  or  for  well  boring,  as  well  ac 
for  agricultural  work.  Length,  4%  feet;  weight,  10  to  12  pounds;  bit,  1%  inches  in  diam- 
eter: complete  with  handle  18  to  21  inehhes  long $5.10 

12357.  EXTENSION  for  No.  12356  Soil  Auger.    Length,   3    feet 1.00 

12360.  FOOT  PLATE,  for  use  with  any  Soil  Auger  2  inches  or  less  in  diameter  to  prevent  the  crumb- 
ling away  of  the  soil  around  the  edge  of  the  hole.     Consists  of  a  steel  tube  slightly  over  2 
inches  in  diameter  provided  at  the  upper  end  with  a  steel  plate  about  4.5x10  inches.     The 
tube  is  driven  into  the  ground  before  the  sampling  hole  is  started  and  the  Plate  makes  a 
convenient  rest  for  the  feet  during  the  entire  operation  of  removing  samples 2.50 

12362.  CARRYING  CASE,  for  Auger  Field  Set,  substantially  made  of  hard  black  fiber  with  lock  and 
clasps,  and  handle  for  carrying.  Compartments  are  provided  for  holding  one  No.  12346  Auger 
(or  one  No.  12350  Auger),  one  No.  12348.  Auger,  two  handles  for  the  above,  four  No.  12351 
Extensions,  and  a  wrench  for  the  lock  nuts.  Complete  with  Wrench,  but  without  Augers  or 

Extensions 7.50 

12:JG4.  AUGER  FIELD  SET,  consisting  of  No.  12362  Carrying  Case  with  wrench,  one  No.  12346  Auger, 

one  No.  12348  Auger,  and  four  Xo.  12351  Extensions     27.00 

12366.  AUGER  FIELD  SET,  same  as  Xo.  12364,  but  with  No.  12350  Auger  instead  of  No.  12346.    27.00 
12370.  SOIL  SAMPLING  TUBE,  King's.     Tube  of  brass,  5  feet  long,  graduated  every  6  inches.     Cut- 
ting head  of  steel  with  area  of  opening  one-ten  millionth  of  an  acre.     Steel  collar  at  top  to 
receive  blows  of  hammer  shown  in  illustration.     This   hammer   is   of   east   iron,  weighing  8 
pounds,  and  is  of  suitable  shape  to  be  held  easily  in  the  hand. 

To  obtain  soil  samples  the  tube  is  driven  into  the  ground  to  the  desired  depth  by  means  of  the 
hammer.  A  column  of  soil  is  thus  forced  up  into  the  tube  from  which  it  is  jarred  after  re- 
moval from  the  ground.  The  outside  of  the  cutter  being  larger  than  the  tube  allows  it  to 
be  drawn  from  the  ground  more  easily.  If,  however,  the  tube  is  not  withdrawn  from  the 
ground  with  sumcient  readiness,  No.  12374  Tube  Hoist  should  be  used. 

With    Hammer 8.00 

12372.  SOIL  SAMPLING  TUBE,  King's,  same  as  No.  12370,  but  3  feet  long.     With  hammer. . .      7.00 

1878.     SAMPLING  TUBE  BRUSH,  for  cleaning  Nos.   12370   and   12372   Soil   Sampling  Tubes.     Bristle 

brush,  with  strong  wire  handle.    Total  length,  65  inches .25 


454 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


12376. 


12378. 


No.  12388.  No.  12376. 

12374.  SOIL  SAMPLING  TUBE  HOIST.  This  contrivance  will  fill  the  need  for  some  device  for  remov- 
ing Soil  Sampling  Tubes  from  the  ground.  Movement  is  imparted  upward  on  the  handle  and, 
the  leverage  being  ample,  no  great  effort  is  needed  to  remove  tubes  from  the  most  solid  soils. 

Hoist  only,  without   Sampling  Tube $8.00 

SOIL  SAMPLING  TUBE,  Whitney's,  especially  useful  for  obtaining  samples  for  determination 
of  moisture  content  and  nitrifying  power  of  soils;  a  brass  tube  9  inches  long,  sharpened  at 
one  end  and  with  a  mark  6  inches  from  that  end,  provided  with  rubber  caps  for  closing  each 

end  air  tight '. 70 

SOIL  SAMPLER,  Bacteriologist's,  after  specifications  by  H.  A.  Noyes  of  the  Purdue  University 
Agricultural  Experiment  Station.  This  sampler  is  a  brass  cylinder  11  inches  long  by  2  inches 
in  diameter,  with  an  especially  constructed  cutting  edge.  The  end  having  the  cutting  edge 
is  furnished  with  a  tight  fitting  brass  cap  2  inches  in  height.  When  the  upper  end  is 
plugged  with  absorbent  cotton,  the  sampler  is  ready  for  sterilization.  The  sampler  is  easy  to 
sterilize,  easily  kept  clean,  easy  to  use,  and  durable,  and  hence  will  be  found  valuable  in  bac- 
teriological work.  This  apparatus  will  (1)  sample  accurately  soil  subjected  to  any  system  of 
management;  (2)  not  interfere  with  the  field  conditions  existing  where  the  sample  is  taken, 
thus  making  future  samples  comparable;  (3)  give  a  representative  sample  of  soil;  and  (4) 
keep  the  sample  practically  under  field  conditions  until  analyzed,  since  the  tube  itself  acts  as 
container  for  the  sample.  Graduated  as  shown  in  the  illustration,  and  with  directions  for 

use  2.50 

DRIVING  HEAD,  of  cast  iron,  for  use  with  No.  12378  Soil  Sampler 40 

SAMPLING  CLOTH,  18x18  inches,  for  receiving  soil  samples  from  Soil  Samplers.     Impervious 

to  moisture * per   dozen      1.00 

12386.  SAMPLE  CARRYING  OUTFIT.     The  inconvenience  of  cumbersome  fruit  jars  and  soil  bags  is 

done  away  with  in  the  design  illustrated.     A  neatly  finished  carrying  case,  with   door  and 

handle,  holding  one  dozen  seamless  tin  cans  of  one  pint  capacity,  with  tight-fitting  lids.     (See 

.    No.  1828.)     The  suitability  of  these  cans  for    drying    pans    makes    this    an    economical    outfit, 

since  special  pans  for  the  drying  oven  are  not  needed.     Complete  with  one  dozen  cans.  .  .    4.50 

1828.     SOIL  SAMPLE  CANS,  Seamless  Tin,  same  style  as  used  in  No.  12386. 

Capacity,    ounces %  1  2  4  8  16  24 

Per  dozen 25  .30  .50  .70  1.00  1.60  1.80 

For  other  SOIL  SAMPLE  CANS  AND  BOXES,  see  Boxes. 
SOIL  SAMPLE  JARS,  see  Jars. 
SOIL  SCOOPS,  see  general  heading  Scoops. 

12388.  SHAKER,  Chest  of  Drawers  Design,  for  preparing  soils  for  mechanical  analysis.  Essentially 
as  described  in  Bulletin  84  of  the  Bureau  of  Soils,  but  with  hinge  mounting  similar  to  that 
described  under  No.  12060  Shaker.  The  gearing  is  of  the  enclosed  type  and  is  arranged  to  be 
belted  to  any  %  h.  p.  motor  having  V-groove  pulley.  The  chest  is  substantially  made  of 
hardwood  nicely  finished,  and  has  six  drawers  each  with  eight  compartments  for  holding 
No.  12391  Sterilizing  Bottles.  Complete  on  a  massive  hardwood  base  with  forty-eight  No. 

12391  Sterilizing  Bottles,  but  without  motor 78.50 

For  MOTORS  for  use  with  No.  12388,  see  general  heading  Electrical  Instruments. 


12379 
12382, 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


455 


No.  12391. 


No.  12394. 


No.  12400. 


12390.  SHAKER,  Tray  Design,  for  preparing  soils  for  mechanical  analysis.     Two  trays  with  compart- 

ments for  eight  bottles  each  are  mounted  on  a  wooden  platform  attached  to  a  substantial 
wooden  base  by  four  hinged  metal  supports.  The  shaking  movement  is  imparted  through  a 
worm  gear  mounted  on  the  same  base.  Sufficient  power  will  be  furnished  by  a  %  h.  p. 
"motor.  The  trays  are  both  made  removable  for  convenience  in  handling  and  filling.  Com- 
plete with,  sixteen  bottles,  but  without  motor  $53.50 

12391.  BOTTLES,  Sterilizer,  for  use  in  Nos.  12388  and  12390.    Capacity,  8  oz per  dozen       .90 

SHAKER,  Soil  Sieve,  see  No.  12148. 

12394.  SHRINKAGE  APPARATUS  for  determining  the  shrinkage  of  soils,  as  described  in  Hosier  and 
Gustaf son's  "Soil  Physics  Laboratory  Manual,"  and  used  at  the  University  of  Illinois.  This 
is  a  tray  of  brass,  3  inches  square  at  the  top,  with  beveled  sides  to  facilitate  removal  of 
the  soil  sample.  In  use,  a  piece  of  cheese  cloth  is  placed  on  the  bottom  of  the  tray,  which 
is  then  filled  with  moist  soil.  The  soil  block  is  then  removed  from  the  tray  and  allowed  to 

dry.     The  shrinkage  in  area  may  readily  be  determined  by  measurement 45.00 

SIEVES  for  Soil  Analysis,  see  general  beading  Sieves. 

SOIL  CONTENT  TESTERS 

12400.  CONDUCTIVITY   BRIDGE,  for  determining  the  soluble  salt  content  of  soils;  made  after  designs 

approved  by  the  TJ.  S.  Bureau  of  Soils. 

The  use  of  this  bridge  depends  on  the  fact  that  the  electric  current  is  conducted  by  the  salt 
in  solution  and  that  the  conductance  of  the  solution  or,  conversely,  its  resistance  to  the  pas- 
sage of  the  current,  is  determined  largely  by  -its  concentration.  The  magnitude  of  current 
that  will  pass  is  increased  by  an  increase  of  salt  in  solution;  or  the  resistance  to  the  pas- 
sage of  the  current  decreases  with  the  increase  of  salt.  The  instrument  is  of  general  util- 
ity in  measuring  the  resistances  of  solutions  of  soils.  It  is  designed  primarily  for  use  as  a 
field  instrument,  and  finds  its  greatest  use  in  determinations  of  "alkali"  or  harmful  excess 
of  soluble  salts,  frequently  present  in  the  soils  of  arid  and  semiarid  areas.  In  survey  work 
it  gives  a  convenient  method  for  determining  in  the  field  the  percentage  of  alkali  in  a  soil, 
so  that  the  mapping  may  be  carried  on  concurrently.  It  is  also  useful  in  determining  the  salt 
content  of  irrigation  and  seepage  waters. 

The  instrument,  by  means  of  which  resistances  are  measured,  is  a  modified  form  of  slide-wire 
Wheatstone  'a  bridge.  In  operating  the  bridge,  the  cup  is  filled  with  the  soil  saturated  with 
water,  and  placed  in  the  clips  provided  for  it.  The  resistance  of  the  cup  contents  is  then 
read,  and  from  the  resistance  the  amount  of  soluble  salt  present  determined  by  reference 
to  the  tables  given  in  the  Bulletin  mentioned  above.  (See  Bulletin  6,  U.  S.  Bureau  of  Soils.) 

Complete  as  described $150.00 

Note. — Bridges  of  the  above  type  made  by  us  have  proved  satisfactory  to  and  met  the  require- 
ments of  the  U.  S.  Bureau  of  Soils,  Washington,  D.  C. 

Bridges  of  this  type  are  used  by  the  Atchison,  Topeka  &  Santa  Fe  Railway  Company  for  testing 
the  alkali  content  of  their  tank  water. 

12401.  DRT  BATTERY,  complete,  as  used  in  No.  12400   Conductivity  Bridge 1.25 


456 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  12404. 


No.  12420. 


No.  F2333. 


12404.  SOIL  ACIDITY  TESTER,  Truog.     This  apparatus  is  made  after  specifications  by  E.  Truog  of 

the  University  of  Wisconsin.  The  principle  employed  is  an  entirely  new  one  and  indicates 
clearly  not  only  the  presence  of  soil  acidity  but  the  degree  of  the  acidity.  Consists  of  a 
specially  designed  Alcohol  Heater  together  with  a  Graduated  Boiling  Flask,  Brass  Measuring 
Cup,  Brass  Measuring  Spoon,  Spatula,  and  all  necessary  reagents.  The  test  is  completed  in 
from  10  to  15  minutes,  and  the  presence  of  acidity  is  shown  by  discoloration  of  the  white 
test  paper  used,  and  the  degree  of  acidity  by  the  exact  color  assumed  by  the  paper  as  com- 
pared with  a  chart  of  standard  colors  furnished.  A  full  set  of  directions  giving  exact  de- 
scription of  the  test  with  all  precautions  is  included.  Complete  as  described,  in  a  neat  hard- 
wood carrying  case $7.50 

Parts  for  No.  12404. 

12405.  FLASK,  300  cc  capacity,  with  mark  at  100  cc 75 

12406.  MEASURING  CUP  for  soil 20 

12407.  MEASURING  SPOON  for  reagents 15 

12408.  TEST  PAPER,  50  sheets  in  glass  vial per  vial       .15 

12409.  SET  OF  REAGENTS,  sufficient  for  making  50  tests,  consisting  of  a  bottle  containing  55  grams 

of  a  mixture  of  calcium  chloride  anfl  zinc  sulphide  specially  prepared,  vial  of  test  paper  (50 
strips),  and  measuring  spoon 75 

F2333.  SPECIFIC  HEAT  APPARATUS  (modified  design  after  Prof.  A.  G.  McCall)  for  determining 
the  Specific  Heat  of  Soils;  may  also  be  used  for  determining  the  specific  heat  of  any  substance. 
Consists  of  a  double-walled  heater  or  steam  jacket  with  large  rectangular  base  and  support 
rod,  and  a  double-walled  calorimeter.  Both  heater  and  calorimeter  are  of  very  substantial 
construction,  and  are  well  insulated.  The  heating  chamber  extends  through  the  heater  and 
is  closed  at  both  ends  with  heavy  insulated  covering.  The  top  cover  has  two  openings,  one 
for  a  thermometer,  and  the  other  for  suspending  the  sample  to  be  tested.  The  clamp  which 
holds  the  heater  rests  on  a  collar  which  is  clamped  to  the  support  rod,  so  that  when  the  sam- 
ple has  come  to  a  constant  temperature  the  lower  cover  of  the  heater  can  be  swung  back  out 
of  the  way  and  the  heater  rapidly  swung  around  to  a  position  over  the  calorimeter.  The 
transfer  of  the  specimen  from  heater  to  calorimeter  can  thus  be  readily  and  quickly  effected. 
Heater  and  calorimeter  complete  as  described,  but  without  thermometers 30.00 

F2334.  CALORIMETER  only  of  No.  F2333  without  thermometers     10.00 

12420.  TANK  for  holding  water,  of  galvanized  iron,  12  inches  in  diameter,  with  drop  handles,  for  use 
with  all  soil  tubes  14  inches  long,  or  under  (e.  g.,  No.  12492) 1.90 

12422.  TANK  for  holding  water,  of  galvanized  iron,  12  inches  in  diameter.  For  use  with  soil  tubes  3fi 
inches  long,  or  under;  made  especially  for  No.  12444  Tube 3.50 

12424.  TANK  for  holding  water,  of  galvanized  iron,  26x6x6  inches.  For  use  in  all  capillarity  experi- 
ments. Used  with  Tubes  Nos.  12444-12464 1.80 


CEXTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


457 


No.  12444. 


No.  12448. 


No.  12454. 


No.  12445.  No.  12434, 

12430.  TENACITY  OF  SOILS  APPARATUS,  for  determining  the  tenacity  of  moist  soils.  In  this  new 
and  improved  design,  which  has  been  daveloped  from  the  original  in  use  at  the  University  of 
Illinois,  the  inaccuracies  due  to  friction,  caused  particularly  by  a  collection  of  dirt  on  the 
moving  parts  of  the-  instrument,  have  been  completely  obviated,  and  constant  conditions 
thereby  assured.  Two  brass  soil  containers  are  supported  on  a  hinged  frame  which  in  turn 
is  securely  clamped  to  the  table  top.  The  soil  containers  are  removable  from  the  frame  and 
are  so  constructed  that  they  may  be  immediately  replaced  in  exactly  the  same  relative  posi- 
tion. In  use,  the  containers  are'held  firmly  together  by  means  of  the  metal  stirrup  shown  in 
the  illustration;  the  moist  soil  is  compacted  in  the  containers  and  smoothed  level  with  the  top, 
thus  leaving  one  square  inch  section  for  testing.  Weights  are  now  placed  in  the  hanger  suf- 
ficient to  pull  the  soil  apart.  Complete,  as  illustrated,  with  canvas  hanger,  but  without 

weights     $12.00 

THERMOMETERS,  Soil,  see  general  heading  Thermometers. 

12434.  TRAY,  Color,  for  testing  effects  of  color  of  soils  on  temperature.  Waterproofed  wooden  tray, 
6  ft.  x  3  ft.  x  6  inches  deep,  with  drainage 15-00 

12436.  TRAYS,  Drainage,  for  showing  effects  of  drainage  on  temperature  of  soils.  Two  water-proofed 
wooden  travs,  each  3  ft.  x  4  ft.  x  6  inches  deep,  one  made  water  tight,  the  other  provided 
with  drainage Per  set  25.00 

12438.  TRAY,  Puddling,  for  mixing  and  working  soils.      Water    tight,    waterproofed    wooden    tray,    2 
inches  x  25  inches  x  2%  inches. '  Will  not  warp 3.50 

TUBES,  SOIL,  ALL  KINDS 

12444.  TUBE,  Capillarity,  McCall.  with  side  tubes  for  studying  the  distribution  of  moisture  in  vertical 

columns  of  soil;  also  for  determining  the  lateral  movement  of  capillary  moisture.  Of  brass, 
36  inches  long  by  2  inches  in  diameter,  with  perforated  bottom  and  small  lateral  tubes  at 
definite  intervals 3.75 

12445.  TUBE,  Sampling,  for  use  in  obtaining  samples  from  the  side  openings  of  No.  12444  Capillarity 

Tube  as  suggested  by  Prof.  John  A.  Slipher  of  Purdue  University.  A  brass  tube  with  diam- 
eter slightly  contracted  at  the  sharpened  end  is  provided  with  a  plunger  by  which  the  sample 

of  soil  may  be  ejected 90 

12448.  TUBE,  Capillarity,  McCall,  for  determining  the  rate  of  the  capillary  rise  of  water  in  soils.  Of 
brass,  36  inches  long  by  2  inches  in  diameter,  with  perforated  bottom.  Running  lengthwise  of 
the  tube  is  a  slot  fitted  with  a  window  of  thin  celluloid  through  which  the  moisture  height 
may  be  noted.  The  construction  of  this  tube  is  such  that  an  additional  length,  which  the 
illustration  shows  in  place,  may  readily  be  attached.  Without  additional  length 4.50 

12450.  TUBE,  Extension,  with  coupling  for  studying  rise  of  moisture  to  greater  height  than  is  possi- 

ble with  Xo.  12448  alone.     Of  brass,  36  "inches  long. 
With   coupling    5.00 

12451.  CELLULOID  STRIP,  36x3  inches,  for  either  Xo.  12448  or  Xo.  12450 60 

12454.  TUBES,  Capillarity,  of  celluloid  protected  by  wire  gauze.    These  tubes  consist  of  a  cylinder  of 

galvanized  iron  wire  gauze  2  inches  in  diameter,  surrounding  a  cylinder  of  thin  transparent 
celluloid  formed  of  a  strip  of  celluloid  sufficiently  wide  to  go  1%  times  around  the  tube. 
These  tubes  are  soil  tight,  transparent,  and  durable,  and  are  very  satisfactory  for  studying 
the  distribution  of  water  in  capillary  *ise  experiments,  since  the  inner  tube  may  be  with- 
drawn and  unrolled,  exposing  the  soil  for  easy  sampling. 

Length,   inches ." 12  24  36  48 

Each    .  66  1.00  1.50  2.80 


458 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  12465. 


No.  2818. 


No.  12472. 


I 


J 


I 


n 


No.  12464. 


CB 

No.  12458 


No.  12462. 


12455. 


12458. 


12459. 
12462. 


VI  -1  til. 


12465. 


2818. 

12468. 

12472. 

P3355 


CELLULOID  STRIPS  for  No.  12454  Tubes. 

Length,  inches   12  24  36  48 

Each   $0.18          .38  .54  .96 

For  CLEANING  BRUSH,  see  No.  1876. 

For  SUPPORT,  see  No.  12462. 

TUBES,  Capillarity,  Sectional,  for  determining  capillary  rise  of  water  in  soils.  These  sections 
are  made  of  heavy  brass  tubing  and  are  8  inches  long  by  1%  inches  in  diameter.  Each  sec- 
tion is  threaded  at  both  ends  to  receive  brass  couplings  so  that  the  tubes  may  be  built  up  to 
any  desired  length.  The  tubes  may  readily  be  cleaned,  and  the  breaking  of  the  soil  column 
which  causes  so  much  annoyance  in  long  brass  and  glass  tubes  is  obviated,  because  the  sec- 
tion joints,  which  are  tight  enough  to  prevent  evaporation  losses  from  the  soil,  are  loose 
enough  to  permit  equalization  of  air  pressure  inside  and  outside  of  tube.  (For  Bottom  Tube, 
see  No.  12459  below.)  Per  section  (with  one  coupling) 1.25 

BOTTOM  TUBE,  for  No.  12458  with  perforated  bottom.     For  use  as  lowest  tube  of  set. .      1.50 

CAPILLARITY  TUBE  SUPPORT  for  supporting  2-inch  tubes  32  inches  long  or  longer  in  a 
vertical  position.  Will  hold  six  tubes  which  may  be  readily  removed  or  put  in  place.  The 
base  is  constructed  in  form  of  a  tray  and  holds  a  water-tight  zinc  tank.  A  rod  and  ring  at 
the  side  of  the  tray  is  designed  to  hold  an  inverted  flask  so  that  the  height  of  the  water  in 
the  tray  may  be  kept  constant.  Complete  as  illustrated,  but  without  flask  or  tubes..  9.00 

TUBES,  Capillarity,  Glass. 

Diameter,   inches 2  2  2  1 

Length,  inches 8  15  24  60 

Each    70          1.20          1.30  .80 

PERFORATED  BOTTOM  for  2-inch  Glass  Soil  Tubes.  May  be  used  with  tubes  from  Ii»/i6 
inches  to  2^g  inches  in  diameter.  Clamps  firmly  to  the  bottom  of  the  tube,  but  may  readily  be 
removed  for  changing  from  one  tube  to  another  30 

For  CLEANING  BRUSH,  see  No.  1876. 

CAPILLARITY  TUBES,  Glass,  student's  lamp  chimney  form per  dozen      1.80 

SUPPORT,  of  wood,  x-or  holding  four  No.  2818  Capillarity  Tubes 1.40 

SUPPORT,  for  four  No.  2818  Capillarity  Tubes,  more  substantial  than  No.  12468.  Base  of  wood 
with  metal  uprights  and  adjustable  shelf  for  supporting  tubes;  finely  finished 2.50 

TUMBLERS,  for  use  with  No.  2818  Tubes;  ^-pint  size per  dozen       .60 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


459 


No.  8386.      Nos.  12500-6. 


No.  12479. 


Nos.  12487-8. 


No.  1876. 


12476. 
12478. 

12479. 

12484. 

124S6. 
12487. 

12488. 
8386. 

12492. 

12494. 
12496. 

1876. 
12500. 


For  ORGANIC  MATTEB,  TUBES,  see  Xo.  12464. 

TUBE,  Percolation  of  Air,  for  comparing  the  rate  of  the  flow  through  soils.  Made  of  brass, 
18  inches  long  by  2  inches  in  diameter,  with  outlet  tube  near  bottom $2.00 

TUBE,  Percolation  of  Water,  for  determining  the  rate  of  percolation  of  water  through  soils.  Of 
brass,  18  inches  long  by  2  inches  in  diameter,  with  lateral  inlets  and  drainage  tube,  and  with 
solid  bottom  below  and  perforated  bottom  above  drainage  tube 2.00 

SUPPORT  BLOCK,  for  use  with  Xo.  12478  Percolation  Tube.  This  block  is  necessary  when 
several  soils  are  to  be  compared 1.75 

For  CLEANING  BRUSH,  see  Xo.  1876. 

TUBE,  Specific  Gravity,  for  determining  the  apparent  specific  gravity  of  surface  soils  under 
field  conditions.  Of  steel,  12  inches  long  by  3  inches  outside  diameter,  with  cutting  edge  2.75 

TUBE,  Specific  Gravity,  same  as  Xo.  12484,  but  4  inches  inside  diameter 5.00 

DRIVING  HEAD,  of  cast  iron,  for  use  with  Xo.   12484  Specific  Gravity  Tube  to  prevent  bat 
tering  the  upper  edge  when  the  tube  is  driven  into  the  ground 50 

DRIVING  HEAD,  same  as  Xo.  12487,  but  for  use  with  Xo.  12486  Tube 1.50 

MAUL  for  driving  Xo.  12484  Specific  Gravity  Tube.  Substantially  made  of  iron  with  hardwood 
faces.  The  handle  is  two  feet  long,  and  the  Maul  is  sufficiently  heavy  for  its  purpose,  with- 
out being  clumsy net  1.40 

TUBE,  Volume  Weight,  for  determining  volume  weight  and  pore  space.  Of  brass,  12  inches 
long  by  2  inches  in  dameter,  with  solid  bottom,  and  crease  one  inch  from  the  top 1.25 

TUBE.  Volume  Weight,  for  elementary  work,  of  brass,  1^x3%  inches 40 

TUBE,  Water  Holding  Capacity,  brass,  12  inches  long  by  2  inches  in  diameter,  with  perforated 
bottom,  !*>?  mm  perforations,  and  crease  one  inch  from  top 1.25 

TUBE  BRUSH,  for  cleaning  soil  tubes  of  2  inch  diameter;  has  a  wooden  handle  3  feet  long  and 
is  provided  with  a  tuft  of  bristles  at  the  end  for  reaching  the  bottom  corners  of  the  tube  .60 

TUBES,  Soil,  so  constructed  that  one  style  of  tube  may  be  used  for  all  experiments.  They  are 
made  from  brass  tubing  10  inches  long  and  2  inches  in  diameter.  A  cast  brass  base,  which  is 
corrugated  on  its  upper  surface,  is  soldered  into  the  bottom  of  the  tube.  On  the  lower  sur- 
face of  this  casting  is  a  connection  for  rubber  tubing.  A  brass  disk  with  circular  perfora- 
tions, and  somewhat  smaller  than  the  inside  of  the  soil  tube,  is  dropped  to  the  bottom  of  the 
tube  and  rests  on  the  corrugated  surface  of  the  brass  base,  allowing  free  passage  of  air  or 
water  through  the  tube.  The  tubes  are  so  constructed  that  they  can  be  connected  in  series 
bv  means  of  rubber  tubing  so  that  a  constant  water  level  may  be  obtained  in  all  the  tubes. 
'  Each  1.50 


460 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  12512. 


No.  12538. 


No.  12540. 


No.  12552. 


12502.  TUBE  BACK  for  6  No.  12500  Soil  Tubes.  The  tube  rack  consists  of  a  cast  iron  base,  smoothly 
finished  and  japanned,  to  which  is  attached  an  upright  standard.  On  this  standard  are  car- 
ried two  castings,  the  lower  one  being  arranged  to  take  and  hold  the  lower  ends  of  the  soil 
tubes  by  means  of  lugs  on  its  upper  surface,  and  the  upper  consisting  of  a  series  of  rings  to 
support  the  upper  ends  of  the  soil  tubes  in  a  concentric  position.  This  arrangement  holds  the 
tubes  securely,  but  still  allows  them  to  be  removed  or  replaced  very  easily.  At  the  same  timo 

it  is  compact,  the  rack  and  tubes  occupying  less  than  one  square  foot  of  desk  room $2.00 

(For  illustration,  see  page  459.) 

12506.  SUPPLY  TANK,  used  in  determining  the  comparative  rate  of  flow  of  water  through  various 
soils.  This  tank  is  made  of  polished  brass  and  rests  on  the  top  of  the  standard  of  the  tube 
rack  by  means  of  a  socket  in  its  base.  Two  short  brass  tubes  extend  downward  from  the  base 
of  the  tank  in  such  a  position  as  to  fall  within  the  two  soil  tubes  on  opposite  sides  of  the 
rack.  The  six  soil  tubes  having  been  connected  in  series,  the  water  flows  from  the  tank  to 

the  soil  tubes,  maintaining  a  constant  water  level  therein 3.50 

(For  illustration,  see  page  459.) 

12508.  SOIL  TUBE  AUGER  for  removing  wet  soil  from  tubes.  This  auger  is  1%  inches  in  diameter, 
of  twist  pattern  and  made  from  polished  cast  steel.  Will  clean  tubes  to  the  bottom 2.50 

12512.  WATER  RETENTION  CUP,  for  determining  the  maximum  water  retained  by  soil.  Of  brass 
2  inches  in  diameter  by  %  inch  high,  with  diaphragm  of  perforated  metal  fastened  about 
%6  inch  below  top.  This  cup  is  used  in  studying  the  wilting  point  by  means  of  the  direct 
relationship  which  exists  between  the  maximum  water  retained  by  any  soil  and  the  wilting 
point.  (See  Hilgard's  "Soils,"  page  209) 30 

1253U.    SOLDER,  Bar  Form,  half  lead  and  half  tin.     Approximate  weight,  iy»  Ibs Per  bar       1.50 

12532.    SOLDER,  Wire  Form,  half  lead  and  half  tin Per  pound      1.00 

12534.  SOLDER,  Wire  Form,  with  resin  center;  half  lead  and  half  tin.  Used  for  all  electrical  joints 
and  splices  where  danger  of  corrosion  must  be  eliminated.  No  flux  required  when  using  this 
solder.  In  1-pound  packages Per  package  1.25 

12538.    SOLDERING  COPPER,  %  lb.,  with  handle 60 

12540.  SOLDERING  COPPERS,  Electric,  for  either  A.  C.  or  D.  C.  circuits.  Tip  interchangeable  and 
can  be  replaced  instantly.  With  cord  and  plug.  In  ordering  please  state  exact  voltage. 

No " A  B 

Length,  inches 10  14% 

Weight,  ounces 9  18 

Diameter  of  tip,  inches %  % 

Watts  60  150 

Each 7.50  9.50 

12544.    SOLDERING  COPPER,  Jewelers',  1  ounce,  high  grade,  for  instrument  use 25 

12548.  SOLDERING  PASTE,  easy  to  apply,  non-acid,  fumeless,  non-corrosive.  Especially  useful  for 
electrical  work  and  in  out-of-the-way  places.  In  metal  cans. 

No A  B 

Size,  ounces 8 

Each 35  .85 

12552.  SOLDERING  OUTFIT,  consisting  of  a  soldering  iron,  bar  of  solder,  scraper  and  flux,  in  a  neat 
wood  box .60 

12554.    SOLDERING  OUTFIT,  less  elaborate  than  No.  12552,  consisting  of  soldering  iron,  piece  of  wire 

solder,  and  flux .25 

SOLDERING  IRON  HEATER,  SOP  Burners  Nos.  2114-6. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


461 


No.  12564.   No.  12568.  No.  12572.  No.  12573.   No.  12574.  No.  12576.     No.  12578.    No.  12580.  No.  12582. 


12564. 
12568. 


12572. 

• 

12573. 
12574. 
12576. 
12578. 

12580. 
12582. 

12588. 


No.  12588. 


SPATULA,  Glass,  6  inch  blade  ground  on  both  sides.     Width  of  blade,  %  inches  ........     $0.25 

SPATULAS,  Horn,  double,  with  spatula  on  each  end. 

Length,  mm  ...............................................     100          125          150          200 


.12 


.15 


.25 


275 
.85 


310 
1.10 


195 
.55 


4 
30 


8 
.95 


345 
1.30 

212 
.72 

6 
.40 

10 
1.50 


Each    ......................................................  10 

SPATULAS,  Platinum,  see  Platinum  Ware. 

SPATULAS,  Porcelain,  -with  paddle  at  one  end,  knob  at  the  other,  glazed  throughout. 
Length,  mm 
Each 
SPATULAS,  Porcelain,  double,  with  spatula  at  each  end. 

Length,  mm  ...............................       105          120          150 

Each   ......................................  25          .35          .42 

SPATULAS,  Hard  Rubber,  solid,  with  flexible  blade. 

Length,  inches   ................................................. 

Each 
SPATULAS.  Steel,  Flexible,  with  cocoa  wood  handle. 

Length  of  blade,  inches  .............          3456 

Each   ...............................  36          .40          .45          .60 

SPATULAS,  Steel,  Very  Flexible,  with  narrow  point  for  weighing,  and  wood  handle. 
Length  of  blade,  inches  ...................................................         4 

Each   .....................................................................  60 

SPATULA,  Steel,  with  special  4  inch  blade,  very  stiff.     Widely  used  in  baking  and  milling  labor- 
atories for  gluten  mixing  ........................................          ..............          .90 

SPATULAS,  Solid  Steel,  Flexible,  with  balanced  handle,  nickel-plated. 

Length  of  blade,  inches  ..................................        3  4  o  6 

Each   ...................................................  60  .70  .75  .85 

SPECIFIC  GRAVITY  APPARATUS,  soe  Bottles,  Specific  Gravity;  Hydrometers;  also  Xos.  392, 

1734,  2500  and  11048. 

SPECIMEN  MOUNTS,  Riker's,  suitable  for  mounting  insects,  butterflies,  fungi,  shells,  etc.,  or 
thick  bulbs  or  plants  too  large  for  thp"Botanical  Mounts,  No.  1556. 

Size,  inches  .............................      2#>x3       4x5         5x6     e^-xS1/^     8x12       12x16 

Each   ....................................  15          .20          .25        "  .30          .50          1.00 

Per  dozen  ...............................        1.75         2.30         2.80         3.50         6.00         12.00 


442 
2.65 

225 
.85 

8 
.50 

12 
2.30 

5 
.80 


462 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  12736. 


No.  12748. 


12692.  SPEED  COUNTER  or  REVOLUTION  COUNTER,  suitable  for  any  purpose  requiring  a  small, 
light  and  accurate  counter.  Registers  up  to  99,999.  Its  action  is  very  smooth  and  uniform 
and  it  will  stand  a  very  high  rate  of  speed.  If  run  backwards,  it  counts  backwards.  Illustra- 
tion is  full  size.  Nickel-plated $1.50 

12694.  SPEED  COUNTER  or  REVOLUTION  COUNTER,  with  ball  thrust  bearing  and  spring  clutch 
which  allows  the  spindle  to  turn  freely  until  the  second  hand  of  one's  watch  has  come  to  zero; 
a  slight  pressure  on  the  end  of  the  instrument  starts  the  count;  when  pressure  is  released  the 
count  stops.  Registers  9,999,  and  can  be  used  on  either  high  speed  or  low  speed  machinery. 
One  pointed  and  one  flat  rubber  tip  furnished  which  serve  as  insulators  when  taking  the  speed 
of  electric  machinery.  The  flat  tip  can  also  be  used  on  flat  or  pointed  shafts.  Nickel-plated.  4.00 

12698.  SPEED  INDICATOR,  improved  form,  may  be  run  at  highest  speed  required  without  heating; 
dial  plate  has  two  rows  of  figures  reading  right  or  left;  rubber  tips  for  both  pointed  and  cen- 
tered shafts,  which  not  only  remove  the  jar  and  run  smoothly,  but  produce  a  stronger  fric- 
tional  contact  with  the  shaft.  The  rotating  disc,  being  carried  by  friction,  may  be  moved  to 
the  starting  point  where  the  raised  knobs  coincide.  Pressing  the  raised  knob  on  the  rotating 
disc  with  the  thumb  prevents  the  disc  from  moving  until  the  hand  of  the  watch  gets  to  the 
right  position  to  take  the  time.  Every  hundred  revolutions  may  be  noted  by  feeling  the  knob 
pass  under  the  thumb,  thus  relieving  the  eye  which  has  only  to  look  on  the  watch  to  note  the 

time.  Nickel-plated 1.26 

See  also  DE  LAY  STOP-WATCH  AND  REVOLUTION  COUNTER  No.  12968. 


12714. 
12718. 
12722. 

12730. 
12731. 
12734. 


SPINTHARISCOPE,  see  Radioactivity  Apparatus. 

SPLINTS,  100  in  package per  package 

SPONGES,  for  cleaning  purposes,  16  to  a  pound   per  pound 

SPOON,  Aluminum,  table  size,  handle  with  ribbed  center 

SPOONS,  Deflagrating,  see  Deflagrating  Spoons. 

SPOON,  Glass,  lamp  blown,  teaspoon 

SPOON,  Glass,  lamp  blown,  tablespoon 

SPOONS,  Horn,  plain  form. 

Length,  mm 100 


.11 


150 
.18 


Each 

12736.    SPOONS,  Horn,  with  spatula  end. 

Length,  mm 

Each 

SPOONS,  Platinum,  see  Platinum  Ware. 
SPOONS,  Porcelain,  with  spatula  end. 

Length,    mm 96 

Each   21 

SPOON.^Sodium,  of  brass  gauze,  with  cover  and  wooden  handle 

SPOON,  Sodium,  Capsule,  with  ram-rod,  according  to  Brownlee 

SPOONS,  Sodium,  cartridge  shells,  8x13  mm  inside Per  dozen 


12742. 


120 
.2V 


140 
.38 


160 
.50 


100 
.20 


200 
.75 


150 
.22 


247 
.85 


12744, 
12746 
12748 


.10 

2.00 

.20 

.30 
.40 

200 
.25 

200 
.30 


490 

2.75 

.30 

.25 

.10 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


463 


No.  12796. 


SPRAYING  MATERIAL,  see  Catalog  A  of  Agricultural  Apparatus. 
SPRING  BALANCES,  see  Balances. 

12754.  SPRINKLER,  Rubber,  bulb  of  extra  quality,  8  ounce  size,  with  straight  neck $1.00 

12756.  SPRINKLER,  Rubber,  same  as  No.  12754,  but  with  bent  neck 1.00 

SPROUTING  APPARATUS,  see  Grain  Testing  Apparatus. 
SPUTUM  BOTTLES,  Square,  see  No.  2757. 

12760.  SPUTUM  DISH,  according  to  Webster,  consisting  of  a  100  mm  Petri  dish  with  one  half  black- 
ened           .50 

12766.  SQUARE,  all  steel,  nicely  polished,  length  2  feet,  width  2  inches,  face  marked  in  4ths,  8ths, 
and  16ths  of  inches,  back  in  4ths  and  12ths  of  inches,  with  board  and  brace  measure. .  1.60 
12768.  SQUARE,  Combination.  The  equivalent  of  a  set  of  try  squares,  a  depth  gage,  a  level,  a  mitre, 
and,  with  the  auxiliary  center  head,  a  centering  square,  both  inside  and  outside.  Convenient 
for  transferring  exact  measurements,  laying  out  work,  or  to  square  in  a  mortise.  Twelve  inch 
blade  graduated  on  one  side  in  %  mm  and  32nds  of  inches;  on  the  other  in  millimeters  and 

64ths  of  inches.     Complete,  with  center  head  and  level 3.00 

12772.    SQUARES,  Try,  blued  steel  blade  graduated  in  8ths  of  inches,  and  rosewood  handle. 

Size,  inches 6  9 

Each 60  .70 

STAGES,  Mechanical,  see  Microscope  Accessories. 
STAGES,  Warm,  see  Microscope  Accessories. 

12780.  STAINING  APPARATUS,  Corper-DeKhotinsky,  see  aext  page. 
STAINING  DISHES,  see  Dishes,  Staining. 
STAINING  JARS,  see  Jars,  Staining. 
12790.  STENCIL,  Cenco,  transparent,  for  quickly  and  easily  drawing  assembled  apparatus  in  student 

note  books  _JQ 

12794.  STENCIL  FIGURES.  Each  figure  has  a  beaded  lock  on  its  edge  so'  that  the  figures  can  be 
joined  together,  permitting  the  use  of  combinations  of  figures  at  one  time  instead  of  single 
figures.  Complete  set  of  one-inch  numbers  from  0-9,  dollar  mark,  cent  mark,  beginner  ender 

and  period    gQ 

12796.  STENCIL  LETTERS.  Same  style  as  No.  12794.  Complete  set'  of  one-inch 'letters  from  'A  to  & 
with  beginner  and  ender,  period,  apostrophe,  comma  and  blank 1.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  S.  A. 


No.  12784.     (Patent  Pending.) 

STAINING  APPARATUS,  Corper-DeKhotinsky,  Electrically  Heated,  as  used  at  the  Municipal 
Tuberculosis  Sanitarium  of  Chicago,  a  clean  and  neat  device  for  hot  staining  and  fixing. 
By  its  use  it  is  possible  to  fix  smears  of  sputum,  etc.,  without  danger  of  burning,  to 
stain  them  without  danger  of  boiling  the  carbolfuchsin  solution  and  also  to  avoid  drop- 
ping carbolfuchsin  over  the  laboratory  tables  and  floors.  It  consists  of  an  asbestos 
wood  frame  with  base  which  will  stand  red  heat  without  destruction.  In  the  bottom  is 
a  sliding  metal  shelf,  to  be  filled  with  sand  for  catching  any  drippings  and  to  aid  in  reflecting 
all  the  heat  upward  front  the  heating  units,  of  which  there  is  one  for  every  two  sides.  These 
units,  which  are  easily  replaceable,  are  wound  with  nichrome  wire,  which  is  insoluble  in  boil- 
ing carbolfuchsin.  The  slide  carriers  are  nickel-plated  brass  frames  made  to  fit  in  the  asbes- 
tos frame  at  a  suitable  height  above  the  electrical  units.  The  base  is  provided  with  leveling 
screws.  A  set  of  fuses  is  placed  on  the  apparatus,  so  that  there  is  no  danger  from  accidental 
short  circuit.  The  apparatus  is  made  in  two  sizes,  as  listed  below,  and  is  intended  for  stand- 
ard 3x1  inch  slides.  It  consists  of  heating  box,  slide  carrier,  tray,  cross  test  level  and  five 
feet  of  asbestos  covered  cord  and  two  plugs.  Complete  with  rheostat  for  close  regulation 

of  heat.     No A  B 

For    slides 10  20 

12780.  For  110  volts $40.00        50.00 

12781.  For  220  volts 41.00         51.00 

12782.  SLIDE  CARRIERS,  extra,  for  Nos.  12780  and  12781. 

No A  B 

For    slides 10  20 

Each    3.25  4.00 

12784.  STAINING  APPARATUS,  Corper-DeKhotinsky,    Electrically   Heated   and   Regulated  (Patent 

Pending),  constructed  for  the  same  purpose  as  No.  12780,  with  the  addition  of  the  DeKhotinsky 
Automatic  Thermo-Regulating  System  to  facilitate  maintaining  a  constant  temperature,  which 
is  especially  convenient  in  research  work.  In  addition  to  its  use  in  fixing  and  staining,  it 
may  be  used  as  a  hot  plate  for  evaporating,  concentrating,  drying  and  boiling,  etc.  It  is  very 
economical  in  consumption  of  electrical  energy,  requiring  only  180  watts  to  maintain  a  tem- 
perature of  180°C.,  over  82  square  inches  of  surface  of  aluminum  plate.  For  20  slides. 

No A  B  C  D 

A.C.  D.O. 

For  volts 110  220  110  220 

Each    92.50         95.00         90.00         92.50 

12785.  SLIDE  CARRIER,  extra;  for  No.  12784 5.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


465 


No.  12802. 


Nos.  12810-11. 


STERILIZERS,  ALL  KINDS 

STERILIZERS.  Autoclaves,  see  Autoclaves. 

12800.  STEEILIZEE,  Instrument,  Electrically  Heated,  with  three  heats.  Made  of  heavy  copper,  nickel- 
plated  and  double  tin  lined  with  perforated  tray.  Provided  with  automatic  cut-out  which 
cuts  off  the  current  if  the  sterilizer  should  run  dry.  The  hinged  lid  is  provided  with  a  ven- 
tilator which  prevents  dripping  when  opening  the  instrument.  Operates  on  either  A.C.  or 
D.C.  Current  consumption  on  low  heat,  125  watts;  on  high  heat,  500  watts.  Size,  10x4%x2% 
inches  deep.  Complete  with  five  feet  of  attachment  cord,  connector,  and  lamp  socket 

plug $24.00 

12802.  STEETLIZEB,  Instrument,  Lewis  Form,  with  lifting  tray,  for  sterilizing  small  instruments  in 
pathological  and  bacteriological  laboratories.  The  tray  carrying  the  instruments  is  raised 
clear  of  the  hot  water  by  opening  the  lid,  and  is  held  there  until  the  lid  is  closed.  Made 
of  copper  nickel-plated.  Dimensions,  10x5x3  inches  deep;  total  height  closed,  6  inches.  Com- 
plete with  burner  and  base  as  illustrated 21.00 

STERILIZER,  Combination  Instrument  and  Dressing,  with  control  valve,  for  sterilizing  instru- 
ments and  dressings.  Consists  of  a  double  walled  chamber  resting  on  a  removable  base 
which  is  used  to  contain  water  for  generating  steam.  The  steam  passes  between  the  double 
walls  and  after  the  contents  of  the  inner  chamber  have  become  heated  to  212°F.,  the  live 
steam  is  admitted  by  a  control  valve  at  the  top  and  forced  through  the  contents  and  out  at 
the  bottom  of  the  other  end.  VThen  sterilization  is  completed,  the  steam  is  again  cut  off  and 
the  contents  are  left  in  the  chamber  until  thoroughly  dried.  The  base  can  be  used  separately 
with  the  cover  and  one  rack  as  an  instrument  sterilizer.  Complete  with  two  wire  cloth  racks 
and  valve  opening  for  thermometer. 

No A 

Length,  inches 14 

Width,    inches 6 

Depth,   inches 6 

Made  of  heavy  tin,  copper  bottom 9.50 

Made  of  polished  copper,  tin  lined 19.50 

STERILIZEK,  Combination  Instrument  and  Dressing,  Electrically  Heated,  of  polished  copper, 
tin  lined,  same  as  No.  12807,  but  with  Prometheus  electric  heater  mounted  in  the  base.  Can 
be  attached  to  any  lamp  socket.  Complete  with  three-heat  plugs,  attachment  cord  and  plug. 

No ...'. A  B 

Length,  inches 14  18 

12810.  For  110  volts 38.00 

12811.  For  220  volts 38.00        53.50 


12806. 
12807. 


B 

18 

7% 

8 

12.00 
26.00 


466 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  12816-17. 


Nos.  12820-21. 


12816. 
12817. 


12820. 
12821. 


12822. 
12823. 


Nos.  12822-23. 


STERILIZERS,  Hot  Air,  DeKhotinsky  Electrically  Heated  and  Regulated,  Triple  Wall,  con- 
structed to  secure  uniformity  of  temperature  throughout  heated  chamber  and  dependable 
temperature  regulation.  Provided  with  the  DeKhotinsky  standard  system  of  heating,  bi- 
metallic thermo-regulator  for  temperatures  up  to  160°C.,  and  with  inner  glass  door  for  obser- 
vation of  contents.  Complete  with  five  feet  of  cord,  Hubbell  receptacle  and  separable  Hub- 
bell  plug  for  attachment  to  any  lamp  socket. 

No A  B  C 

Inside  dimensions,  inches 105/8x7x6%     14%xlL'xll%     19%xl7xl4 

Shelf  space,  square  inches 91  282  476 

For  110  volts  A.C.  and  D.C $55.00  90.00  145.00 

For  220  volts  A.C.  and  D.C 57.50  92.50  147.50 

For  full  description  of  construction,  heating  and  ventilating  system  and  temperature  control, 

see  No.  9830  Drying  Ovens. 

For  EXTRA  FUSES  for  Nos.  12816-7,  see  No.  9838. 

STERILIZERS,  Hot  Air,  DeKhotinsky  Electrically  Heated  and  Regulated,  Single  Wall,  de- 
signed to  supply  the  need  for  a  moderate  priced  sterilizer  with  dependable  temperature  con- 
trol and  uniform  temperature  throughout.  With  same  system  of  heating  and  temperature 
control  as  No.  12816,  but  of  simpler  construction.  For  full  description,  see  No.  9846  Drying 
Ovens. 

Width,  Depth,  Height,          Vol.  Inside,     Shelf  Space,        Voltage 

Inches  Inches  Inches  Cu.  Inches        Sq.  Inches       A.C.  &  D.C.  Price 

11  10  12  1320  220  110  40.00 

11  10  12  1320  220  220  42.50 

STERILIZERS,  Hot  Air,  DeKhotinsky  Electrically  Heated  and  Regulated,  Single  Wall,  of  same 
construction  as  No.  12820,  but  larger,  with  two  doors  and  with  twelve  115  watt  heating  units. 
With  same  equipment  as  No.  12820. 

Width,  Depth,  Height,          Vol.  Inside      Shelf  Space,        Voltage 

Inches  Inches  Inches  Cu.  Inches        Sq.  Inches       A.C.  &  D.C.  Price 

18  12  14  3024  430  110  60.00 

18  12  14  3024  430  220  62.50 

For  EXTRA  FUSES  for  Nos.  12820-3,  see  No.  9850. 
For  EXTRA  HEATING  UNITS  for  Nos.  12816-23,  see  Nos.  7526-7. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


467 


No.  12826. 


No.  12828. 


No.  12830. 

1282t'>.  STERILIZERS.  Hot  Air,  Double  Wall,  of  sheet  iron,  with  enclosed  base,  asbestos  mat,  and 
perforated  shelves.  Without  burner. 

No A  B 

Height  inside,  inches 9  10 

Width   inside,   inches 9  12 

Depth  inside,  inches 6  10 

Height  over  all,  inches 19%  21% 

Number  of  shelves 1  2 

Each    $13.00  21.50 

Tor  BURNERS  for  use  with  No.  12826,  see  Nos.  2108  and  2220. 

1282S.  STERILIZERS,  Hot  Air,  Low  Form,  for  gas  only,  double  walled,  made  of  sheet  iron  covered 
with  asbestos.  The  instrument  is  heated  by  a  row  of  small  Bunsen  burners  around  the  sides 
of  the  base,  insuring  an  even  circulation  of  heat.  The  air  is  introduced  through  openings  in 
the  sides.  With  two  shelves,  ventilator  in  top  and  tubulations  for  thermometer  and  gas  regu- 
lator. Without  thermometer  or  gas  regulator. 

No A  B 

Height  inside,  inches 12  18 

Width  inside,  inches 24  24 

Depth  inside,  inches 12  14 

Each   45.00        67.00 

12830.  STERILIZER,  Hot  Air,  High  Form,  similar  in  construction  to  No.  12828,  but  tall  and  narrow 
in  shape.  Height  inside,  19  inches;  width  inside,  12  inches;  depth  inside,  9%  inches.  With 
three  perforated  shelves 33.00 


468 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  8.  A. 


Nos.  12834-6. 


Nos.  12840-2. 


12834. 
12835. 
12836. 


STERILIZERS,  Hot  Air,  Lautenschlaeger  Form,  of  Russia  iron,  covered  with  asbestos.  This 
sterilizer  has  three  walls,  providing  two  air  spaces  through  which  currents  of  air,  heated 
(when  provided  with  burners  for  gas)  by  a  row  of  small  Bunsen  burners  between  the  outer 
walls,  pass  continuously.  An  even  temperature  is  thereby  maintained.  They  can  be  heated  to 
150°C.,  in  about  5  minutes.  Without  thermo-regulator  or  thermometer. 

No A              B              C  D 

Height  inside,  inches 12              18              24  30 

Width   inside,   inches 18  24              30  36 

Depth   inside,    inches 9  14              18  20 

Number  of  shelves 1                2                3  3 

With  gas  heater $  48.00  62.00  108.00  150.00 


With  oil  heater 90.00       123.00  190.00  247.50 

With  electric  heater 122.50      165.00  275.00  330.00 

STERILIZERS,  Hot  Air,  Lautenschlaeger  Form,  same  as  No.  12834,  but  mounted  on  stand  24 
inches  high. 

No A  B 

Height  inside,  inches 24  30 

Width  inside,  inches 30  36 

Depth  inside,  inches 18  20 

Number  of  shelves 3  3 

12840.  With  gas  heater 121.00  158.50 

12841.  With  oil  heater 203.00  261.00 

12842.  With  electric  heater 288.00  345.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


469 


12846. 
12847. 


Nos.  12846-7. 


No.  12854. 

STERILIZERS,  Arnold  Steam,  with  side  door  and  two  removable  perforated  disks.  These  steril- 
izers are  well  known  for  their  compactness  and  economy.  They  maintain  the  unvarying  tem- 
perature of  boiling  water  in  all  parts  of  the  sterilizing  chamber. 

No A  B              C              D 

Height,    inches 7%  10%  11%  12% 

Diameter,   inches 8%  9  10%  10% 

Made  of  heavy  tin,  copper  bottom $6.25  7.25          8.75  9.75 

Made  of  copper 14.50  20.00  23.00  24.75 


12850.  STERILIZERS.  Arnold  Steam,  Boston  Board  of  Health  Pattern.     Made  of  copper  throughout 
with  double  walls  and  doors,  and  with  two  removable  wire  cloth  trays. 

No A              B 

Height  inside,  inches 14%  15% 

Width   inside,   inches 8%  12% 

Depth  inside,  inches 9  12% 

Each    55.00  60.00 

12854.  STERILIZER,  Test  Tube,  Electric,  consisting  of  a  small  cylindrical  drum,  2%x3*£  inches,  hav- 

ing a  nickel-plated  metal  body  with  a  top  and  bottom  of  %-inch  transite,  mounted  upon  three 
legs.  Near  the  center  is  a  metal  cylinder  li^6  inches  in  diameter  and  1%  inches  in  dep^h, 
surrounded  by  a  resistance  coil  which  heats  its  entire  surface  uniformly  and  quickly.  The 
heating  unit  "is  controlled  by  an  automatic  electro  thenno-regulator,  contained  within  the 
drum,  adjusted  by  means  of  a  screw  reached  by  a  small  screw  driver.  The  thermo-regulator 
completely  controls  the  temperature  so  that  the  contents  of  the  test  tube  may  be  brought  to 
the  boiling  point  without  boiling  over.  Metal  rings  are  provided  for  the  receptacle,  permit- 
ting the  use  of  %,  %,  %  and  1-inch  test  tubes.  Complete  including  test  tube  and  small  cru- 
cible, as  illustrated 15.00 

12855.  STERILIZER  ATTACHMENT,   for  use  with    No.    12854,   for   sterilizing   hypodermic   syringes. 

needles,  etc.  Constructed  of  metal,  nicely  finished  and  polished,  arranged  to  fit  into  the 
heating  tube  of  No.  12854.  Dimensions  of  the  sterilizer  are:  diameter,  3%  inches;  depth, 
%  inch.  The  wire  basket  can  be  removed  by  means  of  an  adjustable  wire  tongs,  which  fits 
into  loops  shown  on  wire  basket.  Similar  loops  are  attached  to  the  body  of  the  sterilizer 
so  that  the  entire  apparatus  may  be  easily  removed  from  heated  receptacle  (the  loops  on 
sterilizers  are  not  shown  in  cut.)  A  nest  of  four  test  tubes  is  furnished  with  the  sterilizer, 
the  largest  one  (1  inch  in  diameter)  having  a  cork  disk  in  the  bottom  to  protect  the  point 
of  scalpel.  This  outfit  in  connection  with  No.  12854  makes  an  ideal  small  sterilizer  for 
hvpodermic  syringes  and  needles,  as  well  as  catheters,  probes,  scalpels,  etc.  Complete  as 
illustrated  7.50 


470 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  12882. 


No.  6156. 


C 
No.  12868. 


D 


E 


STIRRING  APPARATUS 


B 

10 

% 
5 

Me 
6.50 


C 
12 

1% 
8 

Via 
7.00 


12864.  STIRRERS,  High  Speed  Turbine,  for  use  in  water  baths,  etc.,  where  rapid  stirring  must  be 
maintained.  They  are  compact  and  efficient,  operating  without  noise  or  violent  disturbance 
of  the  water.  Especially  adapted  for  use  in  thermostats,  in  physical  chemistry  laboratories 

No A 

Length,  inches 8 

Diameter,   inches % 

Capacity,  liters  per  minute 5 

Power  required  to  operate,  h.  p Me 

Each    $6.00 

STIRRING  APPARATUS,  consisting  of  a  three  step  cone  pulley  with  chuck  for  holding  glass 
stirring  rods,  mounted  in  bracket  with  rod   for   attachment   to   support   stand.     Diameter   of 

largest  pulley,  3%  inches.     For  rods  up  to   *,4   inch 4.00 

STIRRING  RODS,  of  glass  for  use  with  No.  12866. 

Style   A  B  C  D  E 

Each    80  .80  1.25          1.00  .80 

STIRRING  APPARATUS,  Blair's,  as  used  in   iron   analysis.     Complete   with   stirrers,   asbestos 

plate,  6  beakers  and  covers,  without  motor 20.00 

STIRRING  APPARATUS,  Electric,  with  adjustable  bracket,  spindle  with  chuck  to  hold  stirring 
rods,  and  three  step  pulley.     Diameter  of  largest  pulley,  3%   inches.     A  rheostat  is  provided 


12866. 

12868. 

12872. 
5156. 


for  controlling  the  speed.     For  rods  up  to  }4  inch.     No. 


A  B  C  D 

A.C.  D.C. 

For  volts  .............................................        110  220  110  220 

Each    ................................................      27.50         31.50         27.50         31.50 

STIRRING  RODS,  see  Glass  Rods. 
STILLS,  see  Distilling  Apparatus. 


STOP-COCKS,  ALL  KINDS 


to  %  inch  rubber 


12880.    STOP-COCKS,  Brass,  for  gas,  nickel-plated,  with  long  taper  hose  end  for 
tubing;  male  thread  for  attaching  to  gas  pipe  coupling.     Not  for  water. 

Diameter  of  gas  pipe  inside,  inches  ..............................          ^4  %  l/2 

Size  of  I.  P.  thread,  inches  .....................................          J/4  %  % 

Each  ..........................................................  40  .50  .60 

12882.    STOP-COCKS,  Brass,  for  gas,  same  as  No.  12880,  but  with  female  thread  for  attaching  to  gas  pipe. 

Diameter  of  gas  pipe  inside,  inches  ..............................          %  %  % 

Size  of  I.  P.  thread,  inches  .....................................          Vt  %  % 

Each  .                                                            ............................  40  .50  .60 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


471 


No.  12890.      No.  12891. 


No.  12908. 


No.  12912. 


12885. 
12886. 


12884.  STOP-COCK,  Brass,  for  gas,  single,  nickel-plated.  Especially  suited  for  laboratory  use.  The 
nipple  is  2%  inches  long,  tapering  from  %  inch  diameter  at  the  valve  to  *4  inch  diameter  at 
the  end.  The  serrations  prevent  rubber  tubing  from  slipping  off.  With  %  inch  iron  pipe 

male  thread   ?0.60 

STOP-COCK,  Brass,  two-way,  consisting  of  two  No.  12884  Single  Stop-Cocks,  with  flange.       2.50 
STOP-COCK,  Brass,  four-way,  consisting  of  four  No.  12884  Single  Stop-Cocks,  with  flange.       4.00 

STOP-COCKS  AND  NIPPLES  FOR  AIR  PUMPS. 

The  following  nipples  and  stop-cocks  are  accurately  made  of  brass,  polished  and  lacquered,  and  in 
order  that  they  may  be  capable  of  the  greatest  service  in  the  laboratory  we  have  not  threaded  them  for 
use  with  iron  pipe  fittings,  but  have  used  the  same  threads  as  are  used  on  all  our  Air  Pump  Plates  and 
Air  Pump  Accessories  (v^g-inch  in  diameter  and  16  threads  to  the  inch).  Stop-cocks  are  ^  inch  bore; 
nipples,  %6  inch  bore. 

12890.  NIPPLE,  of  brass,  female  screw 

12891.  NIPPLE,  of  brass,  male  screw 

STOP-COCK,  double  male  screw 

STOP-COCK,  one  end  for  tubing,  the  other  with  male  screw 

STOP-COCK,  both  ends  for  tubing 

STOP-COCK,  one  male  and  one  female  screw 

STOP-COCK,  one  end  for  tubing,  the  other  with  female  screw 

STOP-COCK,  both  ends  with  female  screws 


12892. 
12893. 
12894. 
12895. 
12896. 
12897. 
12900. 


.40 
.40 
.60 
.60 
.60 
.80 
.80 
1.00 


STOPCOCK,  Brass,  for  No.  6720  Gas  Bags.     One  end  for  attaching  rubber  tubing,  the  other  a 

%x21/£-inch  brass  tube  for  nozzle  of  gas  bag .90 

12908.    STOP-COCKS,  Glass,  straight. 

Bore,  mm 1  2  3  4  5 

Each 1.25  1.38  1.75  2.00  2.25 

12910.  STOP-COCKS,  Glass,  same  as  No.  12908,  with  curved  outlet  for  aspirator  bottles,  etc. 

Bore,  mm  1  2  3  4  5 

Each    1.50  1.65  2.00  2.25  2.50 

12912.  STOP-COCKS,  Glass,  same  as  No.  12908,  but  with  capillary  tubes  for  use  in  gas  analysis  appara- 
tus, etc.     Outside  diameter  of  tube,  6  to  7  mm. 

Bore  of  stopper,  mm ; 1  3 

Each    1.40  1.50 


472 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  12938. 


No.  12940. 


12916.    STOP-COCKS,  Glass,  three-way  lamp  blown  form. 

Bore  of  stopper,  mm 

Each  . 


No.  12942. 


1 


4 
2.75 


$1.80  2.00 

12918.  STOP-COCK,  Glass,  same  as  No.   12916,  but  with  capillary  tubes.    Bore  of  stopper,  2  mm      2.25 
12920.    STOP-COCK,  Glass,  four- way.     Bore  of  stopper,  2  mm 2.50 

12922.    STOP-COCKS,  Glass,  three-way,  with  downward  outlet  through  stop-cock  plug. 

Bore  of  stopper,  mm 1 

Each 2.65 

12924.  STOP-COCKS,  Glass,  three-way,  same  as  No.  12922,  but  with  capillary  tubes. 

Bore  of  stopper,  mm 

Each    .  


1 
3.00 


o 
2.75 

o 
3.15 


12928. 
12930. 


STOP-COCK,  Glass,  two-way,  with  plug  bored  at  an  angle.    Bore  of  stopper,  2  mm 1.75 

STOP-COCK,  Glass,  two-way,  same  as  No.  12928,   but  with   capillary   tubes.     Bore   of   stopper, 
2   mm    2.15 

12932.  STOP-COCKS,  Glass,  three-way,  with  plug  with  two  holes  bored  at  an  angle,  and  with  two  out- 
lets on  one  side. 

Bore  of  stopper,  mm 2  4 

Each    2.50  4.40 

12934.  STOP-COCKS,  Glass,  three-way,  same  as  No.  12932,  but  with  capillary  tubes.     Bore  of  stopper, 
2   mm    3.00 

12938.  STOP-COCKS,  Glass,  two-way,  with  mercury  seal,  and  plug  bored  at  an  angle. 

Bore  of  stopper,  mm 

Each   


2 
4.00 

12940.    STOP-COCKS,  Glass,  Burette,  with  outlet  drawn  to  a  tip,  for  attaching  to  burettes. 

Bore  of  stopper,  mm 1 

Each 1.40 

12942. 
12946. 


4 
5.50 

2 
1.50 

STOP-COCK,  Glass,  Presenius  form,  for  burette  tips.    With  inlet  tube  bore,  5  mm;  outlet  bore, 
2  mm 1.20 

STOP-COCK  GREASE,  for  lubricating  and  preventing  leakage.     Heavier  and  more  resistant  to 
reagents   than  vaseline per  ounce  bottle       .25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


473 


No.  12954. 


No.  12962. 


No.  12956. 


STOP-WATCHES 

FOR  TIMING  A  SINGLE  PERFORMANCE. 

12954.  STOP-WATCH,  Ordinary  Design.  Xickeled  case,  stem  wind,  lever  escapement,  %  second  divi- 
sions. Convenient  for  testing  and  experimental  work,  being  non-magnetic $11.00 

12956.  STOP-WATCH,  Decimal  Design.  The  minute  is  divided  into  100  parts  so  that  the  watch  is  very 
useful  in  all  timing  operations  in  which  the  minute  is  the  unit  of  time.  Readable  to  %  of  a 
division,  L  e.,  1/300  minute.  Otherwise  same  as  No.  12954  described  above 11.00 

FOR  TIMING  TWO  EVENTS  WHICH  START  SIMULTANEOUSLY  BUT  END  AT 

DIFFERENT  TIMES. 

12960.  STOP-WATCH.  Xickeled  case,  stem  wind,  lever  escapement,  %  second  divisions,  non-magnetic, 
provided  with  two  hands  for  timing  two  events  which  start  simultaneously  but  end  at  different 
times.  Useful  in  timing  laboratory  operations,  and  in  timing  first  and  second  places  in  a  race. 
Has  a  higher  grade  movement  than  Xo.  12954 25.00 

FOR  TIMING  AN  INTERRUPTED  PERFORMANCE. 

12962.  STOP-WATCH.  Xickeled  ease,  stem  wind,  lever  escapement,  7  jewels,  %  second  divisions,  non- 
magnetic. This  watch  is  operated  by  moving  a  "side  piece"  instead  of  pushing  the  "crown." 
This  method  is  easier  on  the  mechanism,  giving  the  watch  much  longer  life.  It  also  operates 
more  smoothly  than  the  old  style  and  will  record  the  time  of  an  interrupted  performance, 
giving  exactly  the  time  used  for  the  performance  itself,  excluding  the  interruption.  The  hands 
will  come  back  to  their  original  starting  point  only  by  pushing  the  "crown" 12.50 

12966.  STOP-WATCH,  DeLay,  Electrically  Operated.  A  high  grade  American  made  stop-watch,  with 
an  electromagnet  attachment  by  means  of  which  the  starting  and  stopping  of  the  watch  may 
be  accomplished. 

The  watch  is  a  seven  jewel  movement  in  a  nickeled  case.  A  chronometer  with  stop-watch  attach- 
ment is  used,  as  this  type  of  stop-watch  is  more  rugged  and  reliable.  The  chronometer  is  a 
good  time  keeper  and  the  electromagnet  attachment  does  not  in  any  way  interfere  with  the  use 
of  the  watch  as  a  time  keeper  or  as  an  ordinary  stop-watch. 

This  device  is  very  useful  in  many  laboratory  experiments,  such  as  the  accurate  determination 
of  the  velocity  of  moving  bodies  and  the  timing  of  various  operations  by  automatically  opening 
and  closing  the  electric  circuit. 


474 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Nos.  12966-8. 


STOP-WATCH,  DeLay,  continued. 


The  speed  of  rotating  shafts  can  be  determined  by  using  this  stop-watch  in  connection  with  a 
special  revolution  counter  (see  No.  12968  below).  Great  accuracy  is  obtained  because  of  the 
fact  that  both  the  revolution  counter  and  stop-watch  are  started  and  stopped  simultaneously 
and  are  in  positive  connection  through  an  electric  circuit.  A  small  flash  light  battery  gives 
sufficient  power  for  operating  this  stop-watch  $20.00 

12968.  STOP-WATCH  and  REVOLUTION  COUNTER,  DeLay.  An  accurate  and  reliable  revolution 
counting  device.  This  device  consists  of  No.  12966  Electrically  Operated  Stop-wateh  and  a 
special  revolution  counter,  connected  together  in  such  a  manner  that  the  time  taken  to  make 
any  number  of  revolutions  may  be  accurately  determined.  The  starting  and  stopping  of  the 
watch  is  simultaneous  with  the  starting  and  stopping  of  the  speed  counter.  No  error  can  pos- 
sibly enter  in.  This  device  is  easily  more  accurate  than  any  other  speed  counter  on  the  market. 

The  revolution  counter  is  the  best  worm  gear  counter  made  and  is  equipped  with  a  small  special 
attachment  for  this  work.  This  attachment  does  not  interfere  with  the  use  of  the  counter  in 
the  ordinary  manner,  and  it  can  be  used  for  either  direction  of  rotation.  A  battery  of  the 
pocket  flash-light  type  is  used  to  operate  the  device. 

To  use  the  device,  the  circuit  is  first  closed,  which  places  the  watch  under  electrical  control. 
The  stem  is  then  pressed,  which  releases  the  hand  mechanically.  Placing  the  rubber  tip  of  the 
counter  in  the  shaft  center  opens  the  watch  circuit  and  starts  the  long  second  hand.  The 
stop-watch  continues  to  run  until  the  speed  counter  is  removed  from  the  shaft,  when  the  elec- 
tric circuit  is  again  closed,  stopping  the  second  hand.  Pressing  the  stem  of  the  watch  holds 
the  hand  mechanically  so  that  the  electric  circuit  may  be  opened.  After  the  reading  of  both 
instruments  has  been  taken,  the  indicators  may  be  returned  to  zero  and  it  is  then  ready  for 
the  next  reading.  The  revolutions  may  be  taken  for  any  number  of  seconds  or  the  time  for 
any  number  of  revolutions  accurately  determined.  When  great  accuracy  is  desired  a  curve 
may  be  plotted  from  which  accurate  readings  may  be  taken  for  fractions  of  a  second. 

Watch  and  Revolution  Counter  complete 30.00 


12969.    REVOLUTION  COUNTER  only,  of  No.  12968,  with  battery  and  cords. 
STORAGE  TANKS,  see  Jars. 
STOVES,  see  Burners. 


12974.    STRAIGHT  EDGE,  cherry,  one  edge  beveled;  24-inch 

For  T-SQUARES,  see  general  heading  Drawing  Instruments. 
STREAK  PLATES,  see  Arsenic  Plates. 
STROPS.  Razor,  see  Microtome  Accessories. 
SUBERITE  RINGS,  see  Cork  Rings. 


10.00 


.35 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  &  A. 


475 


No.  12982. 


No.  12988. 


No.  13002.     No.  10486.  No.  10510. 


SUGAR  ANALYSIS  APPARATUS 


No.  13010. 


BEAKERS,  Copper,  see  general  heading  Beakers. 
BEAKERS,  Glass,  see  general  headings,  Beakers. 

12982.  BEAKER,  Digestion,  for  determining  sncrose  in  beeta  by  the  Herzfeld  modification  of  the  Sachs 
Le  Docte  method.  Made  of  nickel-plated  copper  14  em  high,  6  cm  in  body  diameter,  and  4  cm 
in  diameter  at  the  top.  Complete  with  selected  cork  stopper  covered  with  tin  foiL  (See 
Journal  of  the  Association  of  Official  Agricultural  Chemists,  VoL  n,  No.  1,  Part  n,  page 
81)  **-°0 

CRUCIBLE.  Alundum  Filtering,  see  general  heading  Crucibles. 

CRUCIBLE  HOLDERS,  see  Nos.  3446  and  3448. 

CRUCIBLES,  Gooch.  Opaque  Fused  Silica,  see  general  heading  Crucibles. 

DISHES,  Lead,  Bottle  Caps,  see  general  heading  Dishes. 

FLASKS,  Volumetric  Sugar,  see  general  heading  Flasks. 

12988.  FLASK,  Spencer  Inversion,  for  use  in  inverting  sugar  for  polarization,  with  three  marks  divid- 
ing the  total  100  ce  capacity  into  75,  5  and  20  cc  divisions 1.25 

FUNNELS,  Sugar,  see  general  heading  Funnels. 

13002.  HORTVET  TUBE,  for  determining  the  lead  number  of  maple  products,  etc.,  for  use  in  a  cen- 
trifuge. Length  of  tube,  15.2  cm;  diameter  of  wide  part,  3  cm;  diameter  of  neck,  2  em;  stem 
graduated  to  5  ec  in  Vio  cc  divisions,  with  5  cc  line  5  mm  below  beginning  of  wide  part.  With 
etched  spot  to  facilitate  numbering 80 

HYDROMETERS,  Brix,  see  general  heading  Hydrometers. 
MUFFLE  FURNACE,  see  general  heading  Furnaces. 
OVEN,  Vacuum,  see  general  heading  Ovens. 

10486  PIPETTE,  Spencer's  Glucose,  capacity  50  cc,  graduated  from  5°  to  20°  Brix  in  1/5°  divisions 
2.00 

10510.  PIPETTE,  Sucrose,  capacity  52.096  ec,  graduated  from  5°  to  25"  Brix  in  1/10°  divisions. .       2^0 
PLATINUM  SUGAR  DISHES,  see  general  heading  Platinum  Ware. 
POLARISCOPES,  see  general  heading  Polariscopes. 
PYCNOMETERS,   see  Bottles,  Specific  Gravity. 
REFRACTOMETERS,  see  general  heading  Refractometers. 
ROEHRIG  TUBES,  -.-e  general  heading  Extraction  Apparatus. 
WEIGHING  DISH  and  COUNTERPOISE,  see  general  heading  Balances. 
WEIGHTS,  Normal  Sugar,  see  general  heading  Balances. 

SULPHUR  DETERMINATION  APPARATUS 

13010.  SULPHUR  APPARATUS   Dudley's  Improved,  for  the  determination  of  sulphur  in  iron  by  the 

bromine  method.     Mounted  on  iron  support  as  illustrated 15.00 

13011.  SULPHUR  APPARATUS,  Dudley's,  glass  parts  only  of  No.  13010 12.00 


476 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U-.  S.  A. 


No.  13028. 


No.  5732. 


No.  13032. 


13014.     SULPHUR  APPARATUS,  Meyer's,  for  the  determination  of  sulphur  in  iron  and  steel  by  the 
bromine  method. 

No A  B 

Number  of  bulbs 6  10 

Each $1-50  2.00 

13016.  SULPHUR  APPARATUS,  Meyer's,  same  as  No.  13014,  but  with  stop-cock  ground  to  fit  bulb. 

No A  B 

Number  of  bulbs 6  10 

Each   r 4.00  4.50 

13020.  SULPHUR  APPARATUS,  for  the  determination  of  sulphur  in  oils,  consisting. of  three  glass  parts 
with  wooden  base i 3.00 

13024.  SULPHUR  APPARATUS,  Norris,  for  the  determination  of  sulphur  in  iron  and  steel.     Complete 
as  illustrated 3.50 


3141.  SULPHUR  BULB  only  of  No.  13024 70 

SULPHUR  PHOTOMETER,  Parr's,  see  No.  2378. 

13028.  SULPHUR  RACK,  Illinois  Steel  Company  Form,  consisting  of  an  iron  stand  with  a  row  of  high 
temperature  burners  with  individual  stop-cocks,  and  with  adjustable  flask  supports  and  clamps. 
A  rack  is  provided  with  hooks  to  support  sulphur  bulbs.  Without  glassware 35.00 

5732.  SULPHUR  APPARATUS,  for  determining  whether  grain  has  been  bleached,  as  recommended  in 
Circular  No.  Ill  of  the  United  States  Bureau  of  Plant  Industry.  Consists  of  an  Erlenmeyer 
flask  with  ground  in  connecting  tube.  Capacity,  500  cc 1.95 

SULPHUR  APPARATUS,  Pennock  and  Martin,  see  general  heading  Crucibles. 

13032.  SUNSHINE  RECORDER.     This  instrument  records  the  duration  and  intensity  of  sunshine  for 

twenty-four  hours  on  a  specially  prepared  photographic  chart,  which  merely  requires  washing 
in  cold  water  to  become  permanent.  The  chart  being  divided  into  hours,  an  exact  record  ia 
thus  obtained  with  the  minimum  of  trouble.  Complete  with  divided  arc  for  adjustment  of  in- 
strument to  any  latitude,  with  100  charts  and  directions  for  use 25.00 

13033.  EXTRA  CHARTS  for  No.  13032..  .  .Per  100       3.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


477 


No.  13036. 


No.  13050. 


No.  13038. 


NO.  13054. 


SUPPORTS,  ALL  KINDS 


13036.     SUPPORTS,  Iron,  rectangular  base,  with  coppered  steel  rod. 

No A  B  C  D 

Size  of  base,  inches 4x6%  5x8  5%x9  6x11 

Length  of  rod,  inches , 18  20  24  36 

Diameter  of  rod,  inches 'Ho  %  %  % 

Each   $0.45  .60  .80  1.70 

13038.    SUPPORTS,  Iron,  tripod  base,  with  coppered  steel  rod. 

No A  B  C  D 

Length  of  leg,  inches 4»4  5¥>  6Vj  7% 

Length  of  rod,  inches 18  20  24  36 

Diameter  of  rod,  inches %o  %  %  % 

Each    50  .65  .90  1.75 

13040.    SUPPORTS,  Iron,  rectangular  base,  consisting  of  Support  No.  13036,  with  Rings  No.  11502. 


13042. 

13044. 
13048. 
13050. 
13051. 
13054 


No A             B  C 

Xumber  of  rings 2  4 

Diameter  of  rings  outside,  inches 3.4        3,4.5  3.4.0.6 

Each   85        1.25  1.65 

SUPPORTS,  Iron,  tripod  base,  consisting  of  Support  No.  13038  with  Rings  No.  11502. 

No A             B  C 

Number  of  rings 2  4 

Diameter  of  rings  outside,  inches. 3.4        3,4.5 

1.35 


D 

4 

3.4.5,7 
2.40 


D 
4 


Each 


.90 


3,4.5.6     3,4,5,7 
1.80         2.50 


SUPPORT,  Iron,  tripod  base,  consisting  of  Xo.   13038B,  with  one   each   Extension   Rings   No. 
11504,  3,  4  and  5  inches,  and  3  Xo.  2914  Clamp  Holders.     Complete  as  illustrated 2.20 

SUPPORT,  Hardwood,  Gay-Lussac's,  with  elnmp    cork    lined,    adjustable    in    three    directions. 
Length  of  upright  rod,  16  inches 1-40 

SUPPORT,  Hardwood.     Improved  form  of  Gay-Lussac  's,  with  clamp  on  a  %-ineh  extension  rod, 
10  inches  long 1-50 

WOODEN  CLAMP  only  of  No.  13050,  for  use  with  clamp  holders,  etc.,  in  connection  with  iron 
supports .80 

SUPPORT,  Hardwood,  Schellbach's.    Clamp  cork  lined,  universal  movement 1.70 


478 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TI.  S.  A. 


No.  13060. 


No.  13064. 


No.  13072. 


No.  2248. 


No.  10286. 


No.  13076. 


No.  5292. 


No.  13094  (in  use). 


13058.  SUPPORT,  Burette,  hardwood,  with  cork-lined  clamp,  for  one  burette.  Length  of  rod.  16 
inches  u  .  $0.90 

13060.     SUPPORT,  Burette,  hardwood,  same  as  No.  13058,  but  for  two  burettes 1.25 

13064.  SUPPORT,  Burette,  Hardwood,  round  base,  with  nickel-plated  steel  rod,  22x%6  inches,  and  re- 
volving spring  clamps  for  four  burettes.  Adjustable  in  height 4.50 

13072.  SUPPORT,  Burette,  hardwood,  Chaddock's,  improved  form.  The  rod  and  base  are  of  polished 
hardwood.  On  top  of  the  base  is  a  rectangular  piece  of  white  glass.  The  clamp  is  of  spring 
brass,  which  holds  the  burette  firmly  in  place  without  danger  of  breakage.  The  burette  is 
readily  placed  in  position  or  removed  by  simply  pushing  back  the  brass  spring.  For  two  bu- 
rettes    3.00 

13076.  SUPPORT,  Burette,  Iron,  consisting  of  Support  No.  13036B,  with  Clamp  No.  2842 1.00 

13078.  SUPPORT,  Burette,  Iron,  consisting  of  Support  No.  13038B,  with  cork-lined  hardwood  clamp 
for  two  burettes 2.50 

2248.  SUPPORTS,  Burner,  Iron,  with  flat  top  and  heavy  screw  for  attachment  to  support  stand.  Use- 
ful for  supporting  burners  and  many  other  laboratory  devices. 

No A  B 

Diameter,   inches 3%  5 

Each    25  .60 

10286.  SUPPORT,  Conductivity,  for  use  in  thermostats  for  holding  flasks,  calomel  electrodes,  etc. 
Heavy  base  of  white  metal  with  rod  and  clamp  of  brass,  nickel-plated 2.75 

SUPPORTS,  Electrolytic,  see  Electrolytic  Apparatus. 
5292.     SUPPORT,  Fermentation  Tube,  copper,  for  10  tubes,  without  foot,  as  No.  5280 1.60 

13094.  SUPPORT,  Funnel,  hardwood,  for  one  funnel,  with  arm  large  enough  to  accommodate  beakers. 
Height  of  rod,  16  inches 80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


479 


No.  13106. 


No.  13110. 


No.  13122. 


13096.    SUPPORT,  runnel,  hardwood,  for  two  funnels $0.75 

13098.  SUPPORT,  Funnel,  hardwood,  similar  to  No.  13096,  but  for  four  funnels,  and  with  holes  slotted 
enabling  funnels  to  be  removed  from  the  side 80 

13100.  SUPPORT,  Funnel,  hardwood,  with  iron  clamp  for  attachment  to  support  stand.  With  slotted 
holes  for  four  funnels.  Without  support  stand .45 

13102.  SUPPORTS,  Funnel,  hardwood,  improved  form,  with  slotted  holes.  Adjustable  in  height  from 
7%  to  12  inches. 

No A  B 

For  funnels 6  12 

Each    4.00  8.00 

13106.  SUPPORT,  Funnel,  hardwood,  Leach,  for  separatory  funnels.  Both  bars  adjustable  in  height.  For 
six  funnels 7.00 

13110.  SUPPORT,  Funnel,  Stoddard's  Aluminum,  with  set  screw  for  use  with  No.  13113  Bas?  and  Rod. 
For  four  2  inch  funnels 1.20 

13112.  SUPPORT,  Funnel,  Stoddard's  Aluminum,  same  as  No.  13110,  but  for  four  2%  inch  funnels       2.00 

13113.  BASE  AND  ROD,  for  use  with  No.  13110  and  13112.     Heavily  weighted.     Length  of  rod,  16 

inches;  diameter  of  rod,  *4  inch;  diameter  of  base,  3%  inches .65 

SUPPORTS,  Pipette,  see  No.  10560. 
13122.  SUPPORT   TABLES,   hardwood,    with   leaded  base,  adjustable  in  height. 

No A  B 

Diameter  of  top,  inches 4  4 

Height  closed,  inches 8%  10 

Height  open,  inches 13%  15 

Each    1.50  1.50 


480 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


No.  13134A. 


No.  13124. 


No.  13130. 


No.  13134B. 


No.  13140. 


No.  13138. 


No.  13146. 


13124.  SUPPORT  TABLES,  hardwood  top  with  iron  tripod,  and  brass  tube,  adjustable  in  height.  The 
heaviness  of  the  base  and  support  rods  make  this  an  unusually  stable  support  for  heavy  appa- 
ratus or  for  apparatus  which  should  be  supported  free  from  vibration.  All  surfaces  are 
turned  true  on  the  lathe,  insuring  a  horizontal  surface. 

No A  B 

Diameter  of  top,  inches 6  8 

Height  closed,  inches 12  16 

Height  extended,  inches 18  26 

Each    $4.00         6.00 


C 
12 
17 
27 
7.00 

Dimen- 


13126.  SUPPORT  TABLES,  same  as  No.  13124,  but  with  top  of  iron  machined  to  a  true  plane, 
sions  same  as  No.  13124. 

No A  B               C 

Each    4.25  7.00          8.00 

13130.  SUPPORTS,  Test  Tube,  copper,  round,  for  use  in  water  baths.     Widely  used  in  incubation  and 
inactivation  work.     For  tubes  up  to  %  inch  diameter. 

No A  B               C 

Diameter,   inches 5  6                8 


Number  of  holes 14 

Each   1.00 

13134.    SUPPORTS,  Test  Tube,  hardwood,  with  heavy  base  and  drying  pins. 

No 

For  tubes 

Each  . 


24 
1.25 

A 

6 

.30 


36 
1.50 

B 

10 
.40 


13136.    SUPPORT,  Test  Tube,  hardwood,  Griffith's,  similar  to  No.   13134,  but  with  trough  in   base  for 
draining,  or  for  holding  stirring  rod,  pipettes,  etc.     With  10  holes  for  %  inch  tubes,  2  for  1 


.65 


inch  tubes  and  12  drying  pins 

13138.    SUPPORTS,  Test  Tube,  hardwood,  for  twelve  tubes  in  two  rows. 

No 

Diameter  of  holes,  inches 

Each t 

13140.    SUPPORT,  Test  Tube,  hardwood,  for  12  tubes  in  two  rows  with  12  drying  pins. 

holes,  lYs  inches 

13144.    SUPPORTS,  Test  Tube,  hardwood,  with  two  shelves,  and  drying  pins. 

No A 

For  test  tubes 13 

Each  .  40 


.45 


.70 


Diameter  of 
.80 


B 

25 
.70 


13146.    SUPPOBff,  Test  Tube,  hardwood,  without  glued  joints,  shipped  knocked   down,  with  directions 
for  putting  together;  for  16  tubes,  with  8  drying  pins   .60 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


481 


No.  13172. 


No.  13174. 


13150.  SUPPORTS,  Test  Tube,  hardwood,  with  pins  onlv,  for  drying  test  tubes,  bottles,  flasks,  etc. 

No A  B 

For  test  tubes 25  50 

Each   $0.90          1.10 

13154.    SUPPORTS,  Test  Tube,  stamped  stael,  finished  with  hard  baked  black  enamel. 

No A  B 

For  test  tubes 14  18 

Holes  for  %  inch  tubes 9 

Holes  for  1  inch  tubes 9 

Drving  pins 7  9 

Each 40  .60 

13158.    SUPPORT,  Test  Tube,  tinned  iron    wire.     Will  hold  40  tubes.     Size,  9%  inches  long  by  4Vj 

inches  wide  by  3!£  inches  high $1.10 

13160.    SUPPORT,  Test  Tube,  tinned  iron  wire,  round  form,  for  forty-four  %  inch  test  tubes.     Diameter, 

7%  inches;  height,  3%  inches 1.10 

13162.    SUPPORT,  Test  Tube,  tinned  iron  wire,  square  form,  for  forty-eight  %  inch  test  tubes.     Dimen- 
sions, 7%  inches  by  7%  inches  by  Z%  inches  high 1.10 

131G4.  SUPPORT,  Test  Tube  Basket,  tinned  iron  wire,  cylindrical  form,  for  sterilizing  and  incubating 

culture  tubes.     Diameter,  6  inches:  height,  6  'inches 80 

13166.  SUPPORTS,  Test  Tube  Basket,  tinned  iron  wire,  rectangular  form. 

No A  B 

Height,   inches 6  5% 

Width,   inches 6  4 

Length,  inches 6  5 

Each   1.00  .90 

13168.  SUPPORT,  Test  Tube  Basket,  tinned  iron  wire,  rectangular  form,  with  partition  in  the  middle. 

Length,  8%  inches;  width,  5  inches;  height,  5%  inches 1.30 

13172.  SUPPORT,  Test  Tube,  Vaccine,  nickel-plated  brass,  for  18  vaccine  tubes.     For  use  in  DeKho- 

tinsky  Wassennann  Bath  No.  14332 '. 5.00 

13174.  SUPPORT,  Test  Tube,  Wassennann,  nickel-plated  brass,  with  holes  for  48  tubes  3x%  inches. 

For  use  in  DoKhotinsky  Wassermann  Bath  No.  14332 4.50 

SUPPORT,  Weighing  Tube,  see  Balance  Accessories. 


482 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  13190. 


SURVEYING  INSTRUMENTS,  SIMPLE  TYPE 

For  Forestry,  Mining1  and  Geological  Work. 

BAROMETERS,  see  general  heading  Barometers. 

13182.  CLINOMETER,  Abney's  Reflecting  Level  or  Pocket  Altimeter,  for  measuring  the  height  of 
buildings,  trees,  hills,  etc.,  and  also  for  fixing  the  slopes  for  railroads,  the  rise  and  fall  of 
ground  for  drainage  purposes,  and  all  operations  where  angular  distance  or  inclination  of 
surface  is  desired.  Sighting  tube  5  inches  long,  large  German  silver  arc,  extra  long  draw 
eye-piece,  improved  fixing  clamp  to  vernier.  The  arc  has  two  graduated  scales  upon  it,  one 
giving  the  angular  measurements  by  degrees,  and  subdivided  to  5  minutes  by  the  vernier 
divisions  on  the  index.  The  other  scale  is  figured  1  to  10  with  their  subdivisions.  Com- 
plete in  leather  case,  with  directions $13.50 

F2625.  COMPASS,  Sight,  watch  case  form,  50  mm  diameter,  with  raised  dial  and  full  circle  divisions. 
Bar  needle,  30  mm  long,  with  agate  cap.  Sights  and  spring  cover 11.50 

13190.  COMPASS,  Surveying,  Brunton  Patented  Pocket  Transit,  for  surface  and  underground  survey- 
ing in  mining  and  geological  work.  Case  is  of  aluminum  2%x2%xl  inch.  Weight,  8 
ounces  25.00 


13202.  LEVEL,  Hand,  Reflecting,  for  measuring  slopes  and  gentle  elevations, 
bronzed  tube  with  level,  cross-hair,  and  fixed  eye-piece;  length,  5 
ounces  


Consists   of   a   square 

inches;     weight,     2% 

4.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


483 


Ko.  13208. 


No.  13216. 


13206.  LEVEL,  Simple  Tonn,  consisting  of  a  metal  level,  a  pair  of  level  sights  and  a  stand  for  sup- 
porting the  level  upon  a  flat  surface  or  on  the  end  of  a  stake  or  crow  bar.  By  its  use  one 
can  readily  determine  levels  from  a  given  point  to  one  at  a  distance,  such  as  locating  or 
setting  the  profiles  for  foundation  work,  ascertaining  the  proper  grades  for  drains,  ditches, 
etc.  All  parts  of  the  stand  are  of  metal,  nickel-plated.  The  level  is  of  metal,  nickel-plated 
and  japanned,  and  provided  with  a  3%  inch  horizontal  spirit  level  and  two  1^  inch  vertical 
spirit  levels.  The  sights  are  adjustable  and  clamp  to  the  top  of  the  level  by  set  screws. 
One  sight  is  provided  with  a  peep  hole  and  the  other  with  a  horizontal  cross  wire.  Com- 
plete as  described,  without  stake  or  support  $4.50 

13208.  LEVEL,  Bostrom's  Improved,  provided  with  telescope  which  has  a  magnifying  power  of  eight 
diameters  which  enables  the  cross  on  the  target  to  be  read  at  a  distance  of  one-quarter  of  a 
mile  in  any  direction.  A  circle  graduated  in  degrees  is  provided  for  obtaining  angles,  squar- 
ing up  buildings,  and  all  such  work.  Included  in  the  outfit  is  a  sliding  target  rod,  graduated 
in  feet,  inches,  and  quarter  inches,  telescoping  to  five  feet  when  closed  and  to  nine  and  one- 
half  feet  when  extended,  and  having  a  sliding  target  of  the  usual  form  with  thtfmb-screw 
for  securing  in  any  position.  The  metal  parts  are  of  iron  and  brass,  and  the  wood  parts,  in- 
cluding the  target,  are  of  pine.  Complete  in  neat  wood  box  with  tripod,  sliding  target  rod. 
target  and  plumb  bob 18.00 

13210.  LEVEL,  Bostrom's  Improved,  similar  to  No.  13208,  but  more  substantial  and  of  finer  finish. 
The  telescope  has  a  magnifying  power  of  twelve  diameters  so  that  the  instrument  has  a  much 
greater  range.  All  wood  parts  are  of  hardwood  and  all  metal  parts  of  brass  except  the  tar- 
get. Complete  in  neat  wood  box  with  tripod,  sliding  target  rod,  target  and  plumb  bob  30.00 

13216.  QUADRANT,  for  measuring  altitudes.  A  sector  6  inches  in  diameter,  graduated  from  0°-90° 
in  single  degree  divisions,  mounted  on  polished  wood  base,  with  indicator  and  sight  attach- 
ment. A  level  is  mounted  on  the  base  so  that  it  may  be  adjusted  to  a  true  horizontal  posi- 
tion ...  2.50 


484 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  13226. 


Nos.  13242-3. 


13220. 
13224. 


SURVEYORS'  ARROWS,  made  of  %4  inch  round   steel   fourteen   inches   long,   and   with   rings 

enameled  in  bright  vermilion per  set  of  eleven    $1.25 

TAPES,  Surveyors'  Chain.  Heavy  ^4  inch  steel  tape;  nicely  finished  hardwood  reel,  with 
metal  folding  handle  and  two  large  and  strong  detachable  rings.  Trimmings  nicely  nickel- 
plated.  Graduated  in  feet,  with  end  feet  in  tenths;  or  in  links,  with  end  links  in  tenths, 
graduations  etched  on. 

Length    feet 100          200          300     links    100          200          300 

Each    8.00       12.50       17.50  7.00       10.00       12.50 

13226.  TAPES,  Surveyors'  Chain,  graduated  on  Babbitt  Metal.  This  tape  will  answer  the  require- 
ments of  the  most  severe  usage  and  take  the  place  of  the  old-time  steel  chain.  It  is  made 
of  practically  unbreakable  steel,  heavily  coated  with  white  metal  to  prevent  rusting  and  cor- 
rosion, and  somewhat  heavier  than  the  ordinary  chain  tape.  The  graduations  are  stamped  into 
Babbitt  Metal  at  each  foot  (end  feet  in  tenths),  or  at  each  link  (end  links  in  tenths),  so  that 
the  graduations  can  readily  be  felt  as  the  tape  is  allowed  to  pass  through  the  hand.  Each 
tape  is  provided  with  a  pair  of  detachable  handles,  and  the  reel,  which  is  built  especially  for 
such  tapes,  has  a  nickel-plated  frame  with  folding  winding  handles,  is  easily  wound  and  of 
beautiful  finish. 

Length    feet       100          200          300     links    100          200          300 

Each    7.70       14.00       18.00  7.50       11.00       14.00 

TRANSIT,  Pocket,  see  No.  13190. 

13232.  SWIMMING  CUPS,  Porcelain,  with  perforations,  for  washing  specimens.  With  cork  stopper 
which  floats  the  cup  in  the  washing  fluid. 

No 

Diameter,   mm    

Height,  mm  

Each    

SYRINGES,  ALL  KINDS 

SYRINGES,  Hypodermic,  Luer,  all  glass,  entirely  aseptic,  without  packing,  threads  or  washers. 
Easily  sterilized.  With  slip-on  needles. 

Capacity,   cc    1 

Graduated  in,  cc ^oo 

Syringe  only,  without  needles 1.75 

Syringe   in    pasteboard    box,    with    two 

steel  needles  2.25 

Syringe  in  nickel-plated  case,  with  two 

steel  needles  3.00 


13240. 
13241. 

13242. 
13243. 


1.25 


1.50 


2.25 


2.75 


10 


3.00 


3.50 


A 

27 
35 
.50 


20 
1 

4.00 
4.50 


B 

35 
50 
.65 


30 

1 

5.00 

6.00 


Syringe  in  nickel-plated  case,  with  two 
platinum-iridium  needles  ............     4.75 


2.15 


4.15 


3.90 


9.00 


4.50 


6.25 


10.00         13.50 


7.75 


15.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


485 


j^j  _.  .  ••-.^EjS  f 

'    -     ^  -     -    -     ^-»     -   -     -   .. 
^    .—  .-5  |  -v-    -  -    -  -    -  -T> 

I        _ '      ^ 


,  f°T  subcutaneous  injections. 
i  f°r  subcutaneous  injections. 


F 
22 


G 

22 


H 
20 


J 

20 


2.25   2.25   2.25   2.25 


K 

18 

2 

3.00 


No.  13260.  "  No.  13264. 

13246.  SYRINGES,  Hypodermic.  Luer  Assortment,  consisting  of  16  assorted  needles  for  bacteriological 
and  serological  work  together  with  one  each  of  the  following  syringes,  in  metal  case: 
Luer  Syringe,  %  cc,  graduated  in  I4otn>  for  gray  oil. 
Luer  Syringe,  1  cc,  graduated  in  }iootn>  ^or  tuberculin. 
Luer  Syringe,  double  scale,  25  minims  and  1%  cc  in 
Luer  Syringe,  double  scale,  30  minims  and  2  cc  in 
Luer  Syringe,  5  cc,  graduated  in  ^th,  for  antitoxins. 
Luer  Syringe,  10  cc,  graduated  in  %th,  for  antitoxins  and  salvarsan, 
Luer  Syringe,  20  cc,  graduated  in  }£th,  for  antitoxins  and  salvarsan. 

This  outfit  contains  all  of  the  syringes  required  for  investigation  or  practical  work  in  bacte- 
riology or  serology  ................................................................    $27.00 

13248.  NEEDLES,  Hypodermic,  steel,  slip-on  type,  for  Luer  Syringes. 
No  ...................       A          B          C          D          E 

Gage    ................       26          26          24          24          24 

Length,  inches   .......       %          %          %  1          1% 

Per   dozen  ............     1.50      1.50      1.50       1.50      2.00 

Note:  —  Other  needles  not  regularly  carried  in  stock  will  be  furnished  upon  short  notice. 

13254.  SYRINGES,  Hypodermic,  Sub-Q  Safety,  with  plunger  of  black  glass,  provided  with  prongs  to 

prevent  the  asbestos  packing  from  loosening.     The  6  ce  and  larger  sizes  are  supplied  with 

ring  handle  and  with  rubber  coupling  for  needle.     Complete  with  two  polished  steel  needles 

in  cardboard  case.    Capacity,  cc          1  24  6  12  20  50  100 

Graduated  to,  ce  ............     #00          ^0          tf0          i{<»  %  %  J£  % 

Each     ......................     1.50         1.00        1.50         1.75        2.00         2.50         5.00         7.50 

13256.  STEEL  NEEDLES,  for  No.  13254,  with  threaded  hub. 

For  syringe,  capacity,  ee  .....        1  24  6  12  20  50  100 

Gage  "  ......................       25  25          22  22  21  18  18  18 

Length,  inches  ..............       %  %  1  1  1%          1%          1%  1% 

Per  dozen  ...................     1.50         1.50        2.25         225         2.25         2.50         2.50         2.50 

Per  gross  ...................   15.00       15.00      22.50       22.50       22.50       25.00       25.00       25.00 

Note:  —  Other  needles  not  regularly  carried  in  stock  will  be  furnished  upon  short  notice. 

13260.  SYRINGE,  Aspirating,   with  piston  graduated  to  14  dram,  glass  barrel  with  nickel-plated  metal 

trimmings,  finger  rings,  3  aspirator  needles   (1  each  15  gage  3  inch,   17  gage  2%  inch  and 

19  gage   1%   inch),  one  3  inch  trocar  and  canula,  and  nickel-plated  stop-cock.     Capacity,  2 

drams.     Complete  in  nickel-plated  case  .............................................      4.50 

13264.  SYRINGE,  Injecting,  of  brass,  nickel-plated;  capacity,  45  ce.  For  use  in  injecting  reagents  and 
masses  into  different  blood  vessels.  With  two-way  stop-cock,  four  straight  canulae  of  different 
calibers,  and  two  T  canulae  for  injecting  in  both  directions.  Ends  of  canulae  are  grooved  to 
prevent  them  from  slipping  out  of  vessels,  and  projections  run  out  from  base  of  canulae  to 
fasten  threads  to.  Complete  as  described,  in  wooden  case  with  six  eanulae  and  stop-cock  9.00 


486 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


See  Note  on  Nos.  13318-20. 


No.  13320. 


13266.  SYRINGE,  Injecting,  Kitchen's  Form,  for  injecting  precise  amounts.    The  mixtures  are  made  in 

the  syringe  barrel  and  enough  sterile  salt  solution  is  placed  in  the  side  arm  to  wash  in  the 
entire  dose.  By  this  means  the  necessity  for  removing  the  bulb  of  the  syringe  during  injec- 
tion is  dispensed  with,  and  accuracy  of  dosage  is  insured.  Made  of  resistance  glass  which 
can  be  readily  sterilized.  Complete  with  rubber  bulb,  rubber  connection,  and  antitoxin  needle. 
(For  full  description  see  Kolmer's  Infection  Immunity  and  Specific  Therapy,  page  233) . .  $1.50 

13267.  GLASS  BARREL  only  of  No.  13266 60 

13268.  NEEDLES  only  of  No.  13266 per  dozen     3.00 

13300.  TACHOMETER,,  Hand,  with  three  scales,  rendering  it  unnecessary  to  change  gears.    The  instru- 
ment is  mounted  in  a  case  of  aluminum,  black  enameled  and  nicely  finished,  with  nickel-plated 
ring,  and  is  provided  with  three  dials,  reading  75  to  500  r.  p.  m.,  150  to  1000  r.  p.  m.,  and 
750  to  5000  r.  p.  m.    Diameter  of  dial,  3  inches;  length  over  all,  5  inches;  total  weight  with- 
out case,  2  pounds.    Complete  with  triangular  steel  tip,  rubber  tip,  rubber  muff,  extension  rod, 
and  center  punch  in  leather  carrying  case  with  handle 75.00 

TALLY,  Hand,  see  Counter  No.  3318'. 
13306.  TAPE,  Transparent  Adhesive,  for  mending  pages  of  books,  drawings,  papers,  maps,  etc.,  %  inch 

wide;  4  yards  on  spool  with  metal  holder per   spool        .06 

1536.  TAPE,  Gummed  Cloth,  heavy  mending  tape  for  strengthening  books,  pamphlets,  maps,   etc.,   % 
inch  wide.     A  10  yard  roll  in  special  box  with  slot  for  drawing  out  as  needed. . .  .per  roll     .20 
TAPE,  Insulating,  see  No.  5136. 

13310.  TAPES,  MEASURING,  Linen,  English.  Patent  leather  case,  waterproof  coated,  with  brass  fold- 
ing handle  and  trimmings.  Tape  %  inch  wide,  graduated  in  *4  inches. 

Length,  feet 40  100 

Each $1.20  2.25 

13312.  TAPES,  MEASURING,  Linen,  Metric.  Brass  bound  case  and  folding  handle.  Tape  13  mm  wide, 
graduated  in  centimeters. 

Length,  meters    10  25 

Each 65  1.35 

13314.  TAPES,  MEASURING,  Linen,  English  and  Metric.  Nickel-plated  brass  case  with  spring  wind 
and  center  stop.  Tape  %  inch  wide,  graduated  in  millimeters  and  %  inches. 

Length,  meters 1 

Each 60  .90 

13318.  TAPES,  MEASURING,  Metallic,  English  and  Surveyors.  Hard  leather  case,  folding  handle, 
nickel-plated  trimmings.  Tape  %  inch  wide,  made  of  best  woven  linen  with  metallic  warp, 
graduated  on  one  side  in  tenths  of  feet  and  on  the  other  side  in  links. 

Length,  feet 50  100 

Each 4.50  7.50 

13320.  TAPES,  MEASURING,  Steel,  English.  Metal  lined  hard  leather  case,  nickel-plated  trimmings, 
folding  winding  handle  opened  by  pressing  pin  on  opposite  side.  Tape  %  inch  wide,  gradu- 
ated in  feet,  tenths,  and  hundredths. 

Length,  feet 50  100 

Each 5.60  9.50 

NOTE:  Nos.  13318-20  Measuring  Tapes  are  provided  with  a  new  marking  by  means  of  which 
instantaneous  readings  of  both  feet  and  inches  can  be  made  without  the  necessity  of  referring 
back  to  the  last  entire  foot.  The  method  is  well  shown  in  the  accompanying  illustration. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


437 


_ 


No.  13324. 


No.  13326. 


No. 
13332. 


No.   No.    No.  No.  No.  No. 
13346.  13360.  13352.13354.13358.13360. 


13324.  TAPES,  MEASURING,  Steel,  English  and  Metric,  German  silver  case  with  spring  wind  and  stop. 
Tape  Vi  inch  wide  (5  meter,  ^6  inch),  graduated  in  millimeters  and  16ths  of  inches. 

Length,  meters 1  2  5 

Each $1.00  1.50  4.50 

13326.  TAPE,  Steel,  Diameter  Measuring,  giving  directly  the  diameter  of  a  circular  object  when  its 
circumference  is  measured.  In  metal  lined,  hard  leather  case  with  nickel-plated  trimmings, 
with  folding  flush  handle  opened  by  pressing  upon  a  pin  on  opposite  side.  The  tape  is  of 
steel  %  inch  in  width  and  50  feet  long,  graduated  on  one  side  in  feet,  tenths,  and  hundredths, 
and  on  the  other  side  in  diameters  (inches  and  tenths  of  inches).  Fitted  with  a  special  peg 

or  spike  for  fastening  to  tree  or  other  object  to  be  measured 7.00 

TAPERS,  Wax,  see  Wax  Tapers. 

TAR  TESTER,  see  Asphalt  and  Tar  Testing  Apparatus. 
13332.    TEST  GLASSES,  conical  form,  with  lip,  for  sedimentation. 

Capacity,  cc 30  60  125  175  250 

Each..' -    .50  .50  .60  .80  .90 

TEST  PAPER,  see  Paper. 

TEST  TUBES,  ALL  KINDS 

13346.  TEST  TUBES,  Thin  Wall,  ordinary  glass,  with  lip,  well  annealed,  free  from  lead,  for  chemical 
use. 

Xo A          B          C         D          E          F          G  H          J 

Length,  inches 345566678 

Diameter,  inches....       %%%%%%          1%          1 

Per  dozen 17        .20        .22       .24        .25        .27        .40  .45        .55 

Per  gross 1.65      1.85     2.10     2.20      2.40      2.60      3.90  4.40      5.40 

13350.    TEST  TUBES,  Thin  Wall,  ordinary  glass,  with  lip,  on  foot. 

No A               B  C                 D 

Length,  inches 4  6                  8 

Diameter,  inches %               %  %                  1 

Each 07              .12  .15              .26 

Per  dozen 65             1.20  1.50             2.60 

13352.    TEST  TUBES,  Thin  Wall,  ordinary  glass,  with  lip,  with  side  arm. 

Xo A  B                C 

Length,  inches 5  6                  8 

Diameter,  inches %  %                 1 

Each 13  .15              .18 

Per  dozen 1.30  1.50            1.80 

13354.    TEST  TUBES,  Thin  Wall,  ordinary  glass,  with  lip,  graduated. 

Capacity,  cc 5               10  20              25 

Graduated  to,  cc Mo              Mo  %              % 

Each  .                                                                                       .25             .30  .42             .50 


K 
10 
1 

.75 
7.25 


L 
12 

1 

1.38 
13.80 

E 
10 
1 

.40 
3.90 

D 
10 
1 

.24 
2.35 

30 

% 
.55 


13358.  TEST  TUBES,  Thick  Wall,  ordinary  glass,  without  lip,  culture  tubes  for  bacteriological  work, 
so-called  Board  of  Health  tubes. 

No A              B              C  .     D  E 

Length,  inches 

Diameter,  inches %              %               '-  % 

Per    dozen 30             .35             .40  .45  .85 

Per  gross 2.80          3.10          3.60  3.90  8.20 

13360.  TEST  TUBES,  Thick  Wall,  ordinary  glass,  without  lip,  flat  bottomed,  so-called  specimen  tubes. 

No A  B  C 

Length,  inches 4 

Diameter,   inches %  %  % 

Per   dozen 35  .40  .45 

Per  gross 3.10  3.60  3.90 


488 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  13364.  No.  13370.  No.  9332.  No.  13382.  No.  13390. 

No.  13366.  No.  9330.  No.  9334.  No.  13386.  No.  13400. 


13364.  TEST  TUBES,  Thin  Wall,  non-corrosive  glass,  with  lip,  for  chemical  work. 

No A              B              C  D 

Length,  mm    100            120            150  175 

Diameter,   mm    12              15              18  22 

Per   dozen $0.25            .30            .35  .65 

Per  gross 2.15          2.65          3.05  5.30 

13366.  TEST  TUBES,  Thick  Wall,  non-corrosive  glass,  without  lip,  for  bacteriological  work. 

No A              B              C  D 

Length,    inches 3  4  5 

Diameter,   inches %              %              %  % 

Per   dozen 40            .45            .50  .55 

Per  gross 3.40          3.80          4.30  4.65 


E 

200 
25 
.70 

6.60 

E 

8 

1 

1.10 
9.90 


13370.   TEST  TUBES,  Thick  Wall,  Pyrex  glass,  without  lip,  for  combustion  and  ignition  purposes,  thick- 
ness of  wall,  about  1M>  mm. 


No. 

Length,  mm..  . 

Diameter,  mm. 

Per  dozen 

Per  gross 


A 

100 

16 

1.25 

12.50 


B 

125 

16 

1.50 

15.00 


C 

150 

19 

1.80 

18.00 


9330. 
9332. 
9334. 

13382 
13386 


D 

200 
25 
7.20 
72.00 
.90 
.90 
.90 


TEST  TUBES,  Butter  Fat  Oil,  plain,  9x?4  inches per  dozen 

TEST  TUBES,  Butter  Tat  Oil,  with  line  5  inches  from  bottom per  dozen 

TEST  TUBES,  Cream,  heavy,  for  samples,  5x1%   inches per  dozen 

TEST  TUBES,  Ignition,  with  bulb  at  bottom,  see  Reduction  Tubes. 

TEST  TUBES,  Potato  Culture,  ordinary  glass,  with  lip,  with  constriction  and  bulb  at  the  bot- 
tom. Length,  150  mm;  diameter,  18  mm per  dozen  .90 

TEST  TUBE,  Titer  Tube,  ordinary  glass,  with  lip,  for  determining  the  melting  and  solidifying 
points  of  fats,  and  waxes.  Length,  4  inches;  diameter,  1  inch;  thickness  of  wall,  about  1  mm. 
(See  Journal  of  the  Association  of  Official  Agricultural  Chemists,  Vol.  II,  No.  3,  part  II, 
November  15,  1916,  page  303;  Journal  of  Industrial  and  Engineering  Chemistry,  Vol.  X,  No. 

4,  for  April   1918,  page  317) 90 

13390.  TEST  TUBES,  Wassermann,  Thin  Wall,  non-corrosive  glass,  with  lip,  for  serological  work. 

Length,   mm    75  100 

Diameter,   mm    10  12 

Per  dozen   20  .25 

Per  gross 2.00          2.15 

13394.  TEST  TUBES,  Opaque  Fused  Silica,  heavy  wall,  with  lip. 

Length,   inches 4  5  6  7 

Diameter,  inches V>  %  %  % 

Each    1.06  1 50  2.20  2.81 

13396.  TEST  TUBES,  Transparent  Quartz,   valuable  for  rapid  heating,  since  they  may  be  applied  to 
the  hottest  flame  without  fear  of  cracking. 

Length,   mm    100  100  120  125  150  150 

Diameter,  mm 10  15  15  20  20  25 

Each    1.32  3.12  3.60  4.80  5.40  6.90 

TEST  TUBE  BRUSHES,  see  Brushes. 

13400.  TEST  TUBE  FILLING  ATTACHMENT,   for  measuring  out  exact  quantities  of  culture  media 
and  other  chemical  fluids.     Consists  of  a  separatory  funnel  with  three-way  stop-cock,  to  one 

arm  of  which  is  attached  a  graduated  side  tube.     Capacity,  250  cc 3.50 

TEST  TUBE  HOLDERS,  see  Clamps. 
TEST  TUBE  SUPPORTS,  see  Supports. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


489 


No.  13410. 


No.  13412. 


No.  13416. 


TESTING  MACHINES  FOR  YARN,  CLOTH,  PAPER  AND  RUBBER 

13410.  TESTING  MACHINE,  Yarn,  Hand  Operated,  constructed  on  the  dead  weight  lever  or  pendulum 
principle,  without  springs  or  delicate  parts  to  wear  out  or  cause  trouble.  The  machine  will 
take  54  inch  skeins,  but  may  be  used  on  36  inch  skeins  by  the  addition  of  an  extension  hook. 
For  short  single  strands  special  clamping  screws  may  be  obtained.  The  pull  is  registered 
automatically  by  the  pointer  on  the  dial  until  reset  by  the  operator.  With  9  inch  heavy  iron 
hand  wheel,  mounted  on  oak  back  board,  with  all  metal  parts  finished  in  black  enamel  and 
nickel-plate. 

Capacity,  pounds 100  150  200  250 

Each   (F.   O.  B.  Factory) $62.50        67.50        74.75         80.00 

Note: — These  machines  are  not  carried  in  stock  and  we  can  not  guarantee  immediate  delivery. 

13412.  TESTING  MACHINES,  Cloth  and  Paper,  Hand  Operated,  similar  in  construction  to  No.  13410, 
but  with  clamps  for  use  with  cloth  or  paper,  designed  to  make  various  styles  of  tests.  The  open 
space  back  of  the  gripping  surfaces  allows  large  samples  to  be  used  without  cutting  or  strip- 
ping. Mounted  on  oak  back  board  with  iron  brackets  for  attachment  to  wall.  Total  length 
of  machine,  about  5  feet. 

Capacity,  pounds 100  150  200  250 

Each  (F.  O.  B.  Factory) 90.00       104.50       112.50       163.50 

Note: — These  machines  are  not  carried  in  stock  and  we  can  not  guarantee  immediate  delivery. 

13416.  TESTING  MACHINE,  Rubber,  for  Power  Operation,  vertical  type,  designed  to  be  fastened  to 

the  wall.  The  construction  is  similar  to  that  of  the  textile  testers  described  under  Nos.  13410 
and  13412,  but  modified  to  meet  the  requirements  of  the  rubber  trade.  The  dial  is  gradu- 
ated with  two  rows  of  figures,  the  outer  reading  from  0  to  250  pounds  in  1  pound  divisions, 
the  inner  from  0  to  50  pounds  in  }£  pound  divisions.  The  shift  is  made  by  removing  the  lower 
weight  from  the  lever.  The  stretching  screw  is  1%  inches  in  diameter  and  has  a  maximum 
stroke  of  48  inches,  the  length  being  controlled  by  a  vertical  rod  carrying  two  adjustable 
collars  which  mark  the  starting  point  and  the  reverse.  After  each  test  the  machine  reverses 
automatically,  stopping  in  the  proper  position  to  receive  a  new  sample.  The  normal  speed  of 
20  inches  per  minute  of  the  stretching  screw  may  be  varied  as  desired.  A  graduated  brass 
scale  at  the  left  of  the  machine  carrying  two  riders  connected  by  a  graduated  steel  tape  ena- 
bles the  total  stretch  of  the  sample  or  the  distance  between  any  two  marks  to  be  read  to 
1£0  of  an  inch.  This  machine  can  be  arranged  to  test  fabrics,  cord,  paper,  twines,  yarn  and 
other  materials  as  well  as  rubber.  Total  length  of  machine,  7  feet;  power  required  to  operate, 
%  h.  p.  With  one  pair  of  clamps  and  pulley  for  belt,  but  without  motor. 

F.  O.  B.  Factory 350.00 

Note: — This  machine  is  not  carried  in  stock  aand  we  can  not  guarantee  immediate  delivery. 

13417.  CLAMPS,  Flat  Grip,  for  use  with  Xo.  13416  to  adapt  it  for  paper  testing. 

Per  pair  (F.  O.  B.  Factory) 45.00 

For  other  PAPER  TESTING  MACHINES,  see  Paper  Testing  Apparatus. 
TEXTILE  BALANCES,  CONDITIONING  OVENS,  etc.,  write  for  information. 


490  CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 

THERMIT  FOR  LABORATORY  EXPERIMENTS 

We  list  the  necessary  equipments  for  a  series  of  four  interesting  experiments  with  Dr.  Gold- 
Schmidt's  Thermit,  a  compound  of  a  metallic  oxide  and  granulated  aluminum  which,  when  ignited, 
starts  a  chemical  reaction  which  will  produce  a  temperature  of  3000°  C.  This  is  now  used  extensively 
in  welding  fractures  in  iron  castings  and  rails,  as  the  molten  thermit  iron  has  the  property  of  melting 
the  surface  of  the  iron  it  comes  in  contact  with,  and  forming  a  solid  mass. 

13418.  THERMIT,  Experiment  I.    Welding  a  small  piece  of  steel  to  a  plate. 

Steel  Plate,  %6  inch  thick.                                                2  Cans  Thermit. 
2  Pouring  Cups.                                                                    Bottle  Ignition  Powder. 
Pair  Dark  Glasses  to  protect  Eyes. 
Complete  set " $2.50 

13419.  THERMIT,  Experiment  II.     Burning  a  hole  through  a  plate. 

Steel  Plate,  9  inch  square  x  %  inch  thick.  4  Packages  Plugging  Material. 

Tripod.  Bottle  Ignition  Powder. 

2  Cans  Thermit.  Pair  Dark  Glasses. 

Tapping  Spade.  Large  Crucible. 

Shipping  Weight,  102  Ibs. 
Complete  set 20.00 

13420.  THJ3RMIT,  Experiment  III.     Welding  a  large  boss  to  a  steel  plate  (showing  the  manner  of  weld- 

ing in  industrial  uses). 

2  Steel  Plates,  %  inch.  2  Fire-Brick  Molds,     i   . 

Large  Crucible.  Tripod. 

Bottle  Ignition  Powder.  2  Welding  Portions. 

Package  Luting  Material.  Tapping  Spade. 

2  Packages  Plugging  Material.  Pair  Dark  Glasses. 

Shipping  Weight,  152  Ibs. 
Complete  set 21.50 

13421.  THERMIT,  Experiment  IV.     Pipe  welding.     This  experiment  shows  the  following  peculiar  char- 

acteristics of  the  slag:     First,  its  very  high  temperature;  second,  that  it  sets  at  a  very  high 

temperature;  third,  that  in  plastic  condition  it  is  highly  refractory  remaining  in  a  layer  distinct 

from  the  steel. 

4  Pieces  Standard  Pipe,  6x1  inches.  3  Welding  Portions. 

Mold.  Small  Crucible. 

Pair  Tongs.  1  Set  Clamps. 

Bottle  Ignition  Powder.  Pair  Dark  Glasses. 

Shipping  Weight,  86  Ibs. 
Complete  set 35.00 

13422.  THERMIT  COMBINATION  SET,  suitable  for  all  four  experiments.     Shipping  weight,  270  Ibs. 

65.00 

13423.  THERMIT  COMBINATION  SET.     Experiments  I-III.     Shipping  weight,  230  Ibs 30.00 

13424.  THERMIT,  black per  pound  .65 

13425.  IGNITING  MIXTURE  (8  oz.  smallest  quantity  sold)   per  pound  1.50 

THERMO-COUPLES,  see  Pyrometers. 


No.  13426. 

THERMOMETERS,  ALL  KINDS 
THERMOMETERS  FOR  GENERAL  USE 

13426.    THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  general  use.     Diameter  of  stem,  about   V* 
inch.     Graduated  in  1°  divisions. 

No A                   B                 C                 D                 E  F 

Range,  degrees  C 0  to  60  -10  to  110  0  to  150  0  to  200  0  to  250  0  to  350 

Length,  inches  10       12      12       14       14  16 

Each 1.10     1.20     1.25     1.60     1.80  2.00 

13428.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  same  as  No.  13426,  but  graduated  in  Fahrenheit 
scale,  in  2°  divisions. 

No A                      B  C 

Range,  degrees  F 10  to  220    30  to  400  30  to  650 

Length,  inches 12         14  16 

Each 1.20       1.60  1.80 

13430.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  same  as  No.  13426,  but  with  double  scale. 

No A                      B  C 

Range,  degrees  C -10  to  110           0  to  200  0  to  350 

Range,  degrees  F 10  to  220         30  to  400  30  to  650 

Each 1.80                  2.00  2.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


491 


----- 


Xo.  ism 


No.  13444. 


No.  13464. 

13432.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  similar  to  No.  13426,  but  more  accurately  grad- 
uated and  furnished  with  factory  certificate.  No A  B  C 

Range,  degrees  C -10  to  100         -10  to  200         -10  to  320 

Each   $2.75  S.25  3.50 

13436.  THERMOMETERS,  Enclosed  Milk  Glass  Scale,  diameter  8  to  10  mm,  with  Centigrade  scale. 

No A  B  C 

Bange,  0°  to,  degrees  C 110  200  350 

Each  2.25  S.OO  3.50 

13438.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  with  fractional  divisions,  for  general  labora- 
tory work  where  highest  degree  of  precision  is  hot  required.  With  Centigrade  scale.  Diam- 
eter, about  7  mm.  No A  B  C  D  E  F  G 

Bange,  degrees  C 0-50          0-50          0-100         0-100       100-200       0-200       100-200 

Size  of  subdivisions,  deg.  C . .       %  }fo  H  Mo  %  %  Mo 

Length,   cm    30  38  40  60  50  60  60 

Each    3.50          4^0  4.00          4.50          4^5          6.00          7.00 

13442.  THERMOMETERS,  High  Range,  Solid  Stem,  Engraved  Scale,  filled  with  nitrogen  above  the 

mercury.     Diameter,  about  7  mm.        No A  B 

Bange,   degrees   C 100-400     100-550 

Size  of  subdivisions,  degrees  C 2  2 

Length,  cm   40  40 

Each S.50  5.00 

13444.  THERMOMETERS,  High  Range,  same  as  No.  13442,  but  graduated  in  Fahrenheit  scale. 

No A  B 

Bange,   degrees  F 200-750     200-950 

Size  of  subdivisions,  degrees  F 5  5 

Length,  cm    40  40 

Each   S.50  5.00 

13446.  THERMOMETERS,  High  Bange,  Solid  Stem,  Engraved  Scale,  filled  with  carbon  dioxide  under 
pressure  of  20  atmospheres.  Diameter,  7  to  8  mm. 

No A  B 

Bange,  degrees  C 100-500    180-550 

Size  of  subdivisions,  degrees  C 1  1 

Length,  cm  40  40 

Each    9.00  9.00 

13452.  THERMOMETER.  Low  Range,  Solid  Stem,  Engraved  Scale,  for  low  temperatures.    Bange,  -20° 

to  40°C.,  in  1"  divisions.     Length,  about  25  cm;  diameter,  8  mm 2.00 

1,",454.  THERMOMETER,  Low  Range,  Solid  Stem,  Engraved  Scale,  Alcohol  Filled,  for  low  tempera- 
tures.    Bange,  -50°  to  50°C.,  in  ige   divisions.  Length,  about  30  cm;  diameter  about  8  mm  4.50 
13456.  THERMOMETER,  Low  Range,  Solid  Stem,  Engraved  Scale,  Pentane  Filled,  for  very  low  tem- 
peratures.   Bange,  -200"  to  50°C.,  in  1°  divisions.     Length,   about   35   cm;    diameter,   about 

10  mm 10.00 

1345S.  THERMOMETER,  Low  Range,  Solid  Stem,  Engraved  Scale,  Toluol  Filled,  for  low  temperatures. 
Bange,  -100°  to  50"C.,  in  1°  divisions.  Length,  about  30  cm 7.50 

THERMOMETERS,  NORMAL  OR  PRECISION 

13464.  THERMOMETERS.  Normal  or  Precision.  Solid  Stem.  Engraved  Scale,  for  precision  measure- 
ments where  highest  accuracy  is  essential.  Thermometers  reading  above  250°C.  are  filled 
with  nitrogen.  Graduated  according  to  the  requirements  of  the  United  States  Bureau  of 
Standards.  Without  certificate. 

No A  B  C  D  E  F 

Range,  degrees  C -15  to  50      -15  to  100       -5  to  105      -10  to  110     0  to  250      0  to  300 

Size  of  subdivisions,  deg.  C.  ^0  1  %  ^0  %  1 

Length,  cm    38  30  38  60  45  45 

Each    12.00  8.00  10.00  18.00  9.50  7.50 

13463.  THERMOMETERS.  Normal  or  Precision,  same  as  No.  13464,  but  standardized  by  the  United 
States  Bureau  of  Standards,  with  certificate. 

No A  B  C  D  E  F 

Each    15.00         14.00         16.00         24.00         15.50         15.00 


492 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


1  'AUJi"    "1iU'"I"A'i1illl"liU>"J» 


No.  13500.  No.  13506. 

7373.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Use  with  Moisture  Testers.  Length,  12 
inches.  Range,  0°  to  200°  Centigrade  in  1°  divisions.  With  factory  certificate $2.00 

13486.  THERMOMETER,  Titer  Test,  Solid  Stem,  Engraved  Scale,  according  to  the  requirements  of  the 
Association  of  Official  Agricultural  Chemists.  Range,  10°  to  65°  C.,  in  1/10°  divisions  with 
zero  point  marked,  and  with  reservoirs  at  upper  end  and  between  0°  and  10°  marks.  Length 
of  thermometer,  38  cm;  length  of  bulb,  3  cm;  distance  between  top  of  bulb  and  10°  mark,  3  to 
4  cm;  diameter  of  stem  and  bulb,  about  6  mm.  (See  Journal  of  the  Association  of  Official  Agri- 
cultural Chemists,  Vol.  II,  No.  3,  Part  II,  November  15,  1916,  page  302;  Journal  of  Industrial 
and  Engineering  Chemistry,  Vol.  X,  No.  4,  for  April  1918,  page  317) 9.90 

THERMOMETER  FOR  SPECIAL  USES 

13496.  THERMOMETERS,  Armored,  Solid  Stem,  Engraved  Scale,  with  armor  of  seamless  steel  tubing, 
nickel-plated,  with  lower  end  perforated  around  bulb  to  permit  circulation.  Thermometer  is 
suspended  from  screw  cap  and  easily  removed.  Scaled  for  3  inch  immersion. 


13497. 
13498. 

13499. 
13500. 
13502. 


No  

A                B                 C 

Range,  degrees  F  

0-220         30-400         30  600 

Size  of  subdivisions,  degrees  F.. 

2                  2                   2 

Length,  inches   

12                 14                  16 

Each   

5.00             5.80              6.60 

THERMOMETER  TUBES,  extra,  for 

No.  13496. 

No  

ABC 

Each   

2.50             3.30             4.15 

THERMOMETERS,  Armored,  same  t 

is  No.  13496,  but  with  Centigrade  scale. 

No  

A                B                C 

Range,  degrees  C  

0-100         0  200         0  300 

Size  of  subdivisions,  degrees  C.  . 

1                 1                 1 

Length,  inches   

12               14               16 

Each  

5.00            5.80            6.60 

THERMOMETER  TUBES,  extra,  for 

No.  13498. 

No  

ABC 

Each   

2.50              3.30             4.15 

I) 

30-750 

2 

16 

8.25 

D 
5.80 

D 

0-400 
1 

16 
8.25 

D 
5.80 


E 

100-950 

5 

16 

11.55 

E 
9.10 

E 

50-510 
2 

16 
11.55 

E 
9.10 


Threaded  for 


inch  pipe   and  fitted  with 
2l/2  3V>  4% 

2.30  3.00  3.65 


13503. 
13506. 


WELLS,  Steel,  for  use  with  Nos.  13496  to  13499. 

screw  plug.     Length  below  thread,  inches  .............        iy, 

Each    .............................................        1.65 

THERMOMETERS,  Armored,  Asphalt  and  Sand  Testing,  Solid  Stem,  Engraved  Scale,  with  seam- 
less brass  tubing,  nickel-plated,  and  with  pointed    bulb    to    facilitate   introduction   into    the 
sample.      Constructed  of  glass  tubing  with    walls   of   double    thickness    to    withstand   severe 
usage.     Scaled  for  3  inch  immersion,  except  No.  A,  which  is  for  total  immersion. 
No  ..............  ..,.  ...............................  A  B  C 

Range,  degrees  F  .................................        200-400  100-600  200-750 

Size  of  subdivisions,  degrees  F  .....................  5  5  5 

Length,  inches   ...................................  6  16  16 

TTse  ..............................................      inspection  asphalt  sand 

Each   ............................................  5.00  6.60  8.25 

THERMOMETER  TUBES,  extra,  for  No.  13502.     No  ..............         A  B  C 

Each   .......................................................       2.50  4.15  5.75 

THERMOMETERS,  Armored,  Asphalt,  with  Protected  Bulb,  and  engraved  stem.   The  bulb  is  im- 
mersed in  a  bath  of  mercury  contained  in  the  long  slender  steel  cup  forming  ths  stem,  afford- 
ing protection  and  making  it  almost  as  quick  reading  as  a  bare  glass  bulb.     Length  of  case, 
10  inches.     No  ...................................................  A  B 

Range,  degrees  F  ...............................................        200-400  200-650 

Size  of  subdivisions,  degrees  F  ..................................  2  5 

Each  ......................  6.60  6.60 


CEXTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


493 


No.  13514. 


Nos.  13518-9.     Nos.  13518-9. 


No.  13522. 


13507.  THERMOMETER  TUBES,  extra,  for  No.  13506. 

Xo A  B 

Each..... $3.30  3.30 

No    13508  13508.  THERMOMETER,  Automatic  Alarm,  for  giving  an  alarm  the  instant  the  tem- 

perature registers  a  given   degree.  Consists  of  a  straight  mercury  tube,  into 
the  bore  of  which  a  fine  platinum  wire  is  fused  at  32°  F.,  or  at  any  other 
degree   desired.     Through  a  non-sparking  relay  attachment  a  bell  is  made 
to  ring  at  practically  any  distance  from  the  thermometer  itself,  at  the  exact 
moment  the  temperature  where  the  instrument  is  located  reaches  the  danger  point.      Strongly 
constructed  and  fully  protected  by  a  heavy  metal  weather-proof  case,  which  allows  circulation 
of  air.     May  be  installed  in  three  different  ways:     (1)    one  thermometer  and  simple  alarm; 
(2)  more  than  one  thermometer  and  simple  alarm;    (3)   more  than  one  thermometer  and  an- 
nunciator alarm  showing  exact  location  of  danger  point.     In  ordering,  kindly  state  the  tem- 
perature at  which  alarm  is  to  be  given.     Complete  with  relay,  but  without  batteries,  bell,  or 

wire 18.00 

13510.  THERMOMETER,  Automatic  Alarm,  similar  to  No.  13508,  but  arranged  to  ring  at  either  of  two 
temperatures  desired,  which  must  be  specified  when  ordering.  Complete  with  relay,  but  with- 
out batteries,  bell,  or  wire 24.30 

13514.  THERMOMETER,  Bake  Oven,  Medium  Grade,  consisting  of  a  glass  tube,  mercury-filled,  mounted 
on  5-inch  flanged  metal  scale  with  sand  blast  finish  and  white  figures.  With  round  removable 

base  with  asbestos  mat  attached.     Range,  about  100°  to  600°  F 1.50 

THERMOMETER,  Beckmann,  for  the  exact  determination  of  slight  changes  in  temperature. 
Widely  used  in  calorimetry  and  in  boiling  and  freezing  point  determinations.  Consists  of  a 
capillary  of  normal  glass  graduated  to  1/100  degree  over  a  range  of  5°  or  6°  C.,  with  an 
auxiliary  scale  at  the  top  graduated  from  -10°  to  120°  C.,  in  2°  divisions,  sealed  in  a  glass 
jacket  with  metal  cap.  The  thermometer  may  be  set  to  read  at  any  temperature  between  -10° 
and  120°  C.  Constructed  and  graduated  according  to  the  requirements  of  the  United  States 
Bureau  of  Standards. 

13518.  Without  certificate 20.00 

13519.  With  Bureau  of  Standards  certificate 32.50 

THERMOMETER,  Beckmann,  improved,  similar  to  Xo.  13518,  but  with  improved  method  of  ad- 
justment of  temperature.     In  the  reservoir  beneath  the  auxiliary  scale  is  a  short  capillary  (a), 
the  opening  of  which  is  adjusted  to  deliver  a  drop  of  mercury  of  sufficient  size  to  produce  a 
fixed  change  of  temperature  in  degrees  C.,  the  exact  amount  of  this  change  being  engraved  on 
the  scale  of  the  thermometer.     This  improved  construction  obviates  the  necessity  of  tapping 
the  mercury  column,  with  the  consequent  danger  of  breakage.     It  also  makes  easier  the  return 
of  excess  mercury  from  the  reservoir  to  the  bulb  which  takes  place  automatically  if  the  ther- 
mometer is  held  in  a  perpendicular  position.     Mercury  from  the  reservoir  may  be  transferred 
to  the  side  arms  by  merely  inclining  the  thermometer.      Graduated  according  to  the  require- 
ments of  the  United  States  Bureau  of  Standards. 

13-.22.  Without  certificate   25.00 

13523.  With  Bureau  of  Standards  certificate 37.50. 


494 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  13548. 


No.  13562. 


No.  13564. 


THERMOMETERS,  Calorimeter,  Solid  Stem,  Engraved  Scale,  as  used  with  oxygen 
bomb    calorimeters.     Graduated    to    meet  the  requirements  of  the  United  States 

Bureau  of  Standards.  No A  B 

Range,   degrees   C 18-30  20-30 

Size  of  subdivisions,  degrees  C 1/50  1/100 

Length,  inches   18  24 

13528.  Without  certificate $15.00  20.00 

No.  13558.    13529.  With  Bureau  of  Standards  certificate 30.00  35.00 

THERMOMETERS,  Calorimeter,  Solid  Stem,  Engraved  Scale,  as  used  with  Parr  Calorimeters. 
Graduated  to  meet  the  requirements  of  the  United  States  Bureau  of  Standards. 

No A  B 

Range,  degrees  F 65  to  90  65  to  105 

Size  of  subdivisions,  degrees  F 1/20  1/20 

13532.  Without  certificate  10.00  13.00 

13533.  With  Bureau  of  Standards  certificate 12.00  15.00 

THERMOMETERS,  Gas  Calorimeter,  Solid  Stem,  Engraved  Scale,  according  to  the  recommenda- 
tions of  the  American  Gas  Institute,  as  used  in  Junker  and  other  gas  calorimeters.     Length, 
about  45  cm;  diameter,  about  8  mm.     (See  Report  of  Committee  on  Calorimetry  for  1912.) 

No A  B 

Range 60°  to  110°F.         15°  to  40°C. 

Size  of  subdivisions,  degrees 1/10  1/10 

13536.  With  factory  certificate. 18.00  18.00 

13537.  With  Bureau  of  Standards  certificate 26.00  25.00 

13540.  THERMOMETER,  Gas  Calorimeter,  Solid  Stem,  Engraved  Scale,  high  grade.     Graduated  from 

30°  to  150°  F.,  in  1/10°  divisions 8.50 


13546.  THERMOMETER,  Clinical,  One  Minute,  first  grade,  with  magnifying  tube,  in  hard  rubber  case, 
with  factory  certificate  1.50 

13548.  THERMOMETER,  Clinical,  Veterinary,  first  grade,  pear-shapea  bulb,  ring  top,  with  magnifying 

tube,  in  hard  rubber  ease,  with  factory  certificate  1.75 

THERMOMETERS,  Dairy,  see  Milk  Testing  Apparatus. 

13558.  THERMOMETER,  Dough  Testing,  of  glass  in  7  inch  nickel-plated  iron  case,  with  11  inch  steel 
stem.  The  scale  is  of  silvered  metal  with  black  rilled  figures  and  graduations.  Range,  30°  to 
120°  F 8.00 

13562.  THERMOMETER,  Household,  standard  grade,  10  inch,  heavy  japanned  tin  case,  accurately  tested. 
Approximate  range.— 20°  to  120°F 1.35 

13564  THERMOMETER,,  Household,  8  inch,  metal  scale,  oak  back,  beveled  edge,  with  brass  guard  over 
bulb.  Approximate  range,— 20°  to  120°F 1.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


495 


No.  13568.     ^•j.Lrg^H^H        Ko'  1358t  No-  1359°-         No.  13592.        No.  13594. 

No.  13578. 

13568.  THERMOMETER,  Incubator,  Solid  Stem,  Engraved  Scale,  with  enlargement  in  stem  to  prevent 

slipping  through  hole  in  stopper.     Length,  about  20  cm.     Range,  0"  to  50°  C.,  in  1°  divisions 

.-- $2.50 

13572.  THERMOMETER,  Maximum  Registering,  XT.  S.  Weather  Bureau  Pattern,  12  inch,  cylindrical 
bulb,  graduation  etched  on  tube.  The  tub?  is  mounted  on  an  aluminum  scale  on  which  is 
marked  every  5  degree  line  of  the  scale,  and  the  figures  every  10  degrees.  Has  brafs  insulat- 
ing support  and  binding  screws.  Approximate  range,  -30°  to  120°  F.  With  manufacturer's 
certificate  7.20 


13574. 
13578. 


THERMOMETER.  Minimum  Registering,  U.  S.  Weather  Bureau  Pattern.  Same  general  descrip- 
tion as  No.  13572.  Mercury  filled  tube.  With  manufacturer 's  certificate 6.60 

THERMOMETESS,  Maximum  and  Minimum  Registering,  TJ.  S.  Weather  Bureau  Pattern.  Same 
thermometers  as  Nos.  13572  and  13J>74,  but  with  special  insulating  support.  Mounted  on  ma- 
hogany finish  back,  17x5  inches,  with  manufacturer's  certificate  for  each  thermometer. 

Per  set    14.40 

13579.  THERMOMETER,  Maximum,  only  for  No.  13578.    With  manufacturer's  certificate 7.20 

13580.  THERMOMETER,  Minimum,  only  for  No.  13578.     With  manufacturer's  certificate 6.60 

13584.    THERMOMETER,  Maximum  and  Minimum  Registering,  Six's  Pattern,  in  japanned  tin  ease 

with  metal  scale.     Length,  8  inches;  approximate    range,   — 20°    to    120°F.        Complete   with 

horseshoe  magnet  for  resetting 4.20 

13590.  THERMOMETERS,  Metal  Scale,  highest  grade,  with  scale  of  oxidized  brass  in  black  japanned 

tin  case.     Length,  10  inches.      No A  B  C 

Range,  degrees  F -20  to  120  0  to  220  50  to  350 

Each   1.25  1.25  1.50 

13592.  THERMOMETER,  Metal  Scale,  with  Copper  Cup,  highest  grade,  for  determining  the  average 
temperature  of  oil  or  other  liquids  in  tank  ears  or  tanks  and  securing  a  sample  at  the  same 

time.     Bange,  10°  to  220°  F.     Length,  12  inches   3.30 

13594.  THERMOMETER,  Metal  Scale,  Sugar  Factory,  standard  grade,  with  magnifying  tube  filled  with 
mercury,  silvered  brass  seale  with  black  figures,  and  brass  screw  clamps.    Bottom  of  copper  case 
is  closed  to  permit  samples  to  be  taken.     Length,  12  inches.     Bange,  about  0°  to  150°  Centi- 
.e 


grade 


2.75 


THERMOMETERS,  Metal  Frame,  Straight  and  Angle  Stem,  for  steam  boilers,  water  heaters,  oil 
stills,  etc.     Send  for  special  bulletin. 


496  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  13598. 


"T— 1 • 

iu     > 


No.  13612. 


i     i_  :--H-^rpgs!±^!L^ 

No.  13618. 

13598.  THERMOMETER,  METALLIC,  Demonstration  Form,  with  glass  back  to  show  the  internal 
mechanism,  which  consists  of  a  strip  of  two  metals  soldered  together  and  connected  with  an 
index  hand  by  a  multiplying  lever.  Diameter  6  inches.  Range,  — 50  to  150  degrees  F. .  $4.50 

THERMOMETERS  FOR  OIL  TESTING 

13606.  THERMOMETER,  Paper  Scale,  for  Cold  Test,  graduated  from  -20°  to  120°  F.,  in  2°  divisions. 

For  determining  the  congealing  point  of  lubricating  oils.  Length,  8  inches 3.30 

13608.  THERMOMETER,  Paper  Scale,  for  Flash  and  Fire  Test,  graduated  from  -20°  to  230°  F.,  in  1° 

divisions.  For  use  with  No.  9676  Open  Fire  Tester.  Length,  12  inches 3.30 

13610.  THERMOMETER,  Paper  Scale,  for  Wax  Test,  graduated  from  90°  to  150°  F.,  in  %°  divisions. 

For  determining  melting  point  of  waxes,  paraffines  and  greases.     Length,  12  inches.  . .  .       4.40 

13612.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Cold  Test,  graduated  from  -20°  to  140°  F.,  in 

2°  divisions,  for  determining  the  congealing  point  of  lubricating  oils.  Length,  8%  inches       2.50 

13613.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Cold  Test,  graduated  from  -40°  to  100°  F., 

in  1°  divisions.     Length,  30  cm 2.00 

13614.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Cold  Test,  same  as  No.  13613,  but  graduated 

from  -40°  to  40°  C.,  in  1°  divisions.     Length,  25  cm 2.00 

13616.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  Distillation.     Pointed  for  3  inch  immersion. 

No A  B  C 

Range,  degrees  F 30  to  400         30  to  750         100  to  950 

Size  of  subdivisions,  degrees  F 2  2  5 

Length,  inches 15  15  16 

Each  - 4.15  8.25  9.10 

13618.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  Distillation.  Same  as  No.  13616,  but  grad- 
uated in  Centigrade  scale.  No A  R  C 

Range,  0°  to,  degrees  C 200  400  510 

Size  of  subdivisions,  degrees  C 1  1  2 

Length,  inches 15  15  16 

Each   4.15  8.25  9.10 

13622.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Distillation  of  Gasoline,  graduated  to  read 
from  0°  to  270°  C.  Made  according  to  specifications  of  the  United  States  Bureau  of  Mines. 

(See  Technical  Paper  166,  May  1917,  page   21) 4.15 

13624.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  same  as  No.  13622,  but  graduated  from  20°  to 

520°  F.  in  2°  divisions 4.15 

9663.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  Flash  Test,  for  use  in  oil  cup  of  No.  9662 
Bureau  of  Mines  Flash  Tester.     Graduated  in  %  degree  divisions. 

No A  B 

Range,  degrees  C 0-50  40-110 

Each   8.25  8.25 

9669.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  Flash  Test,  for  use  in  oil  cup  of  No.  9668 
Bureau  of  Mines  Flash  Tester.     With  round  bulb,  graduated  in  1  degree  divisions. 

No A  B  C 

Range,  degrees  C 100-210  200-310  300-410 

Each   8.25  8.25  9.90 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


497 


No.  13636. 


No.  13640. 


No.  13652. 


NO.  13658  (glass  tube  only). 


f 

^^•••^^ 


No.  13662. 

13634.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Flash  and  Fire  Test,  for  low  flashing  oils. 
Graduated  from  -10°  to  110°  C.,  in  1°  divisions.  According  to  the  specifications  of  the  Ameri- 
can Society  for  Testing  Materials.  Length,  12  inches $2.50 

13636.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  Flash  and  Fire  Test,  pointed  for  1  inch  im- 
mersion. Length,  15  inches.  No A  B  C  D 

Range,  20°  to,  degrees  F 220         300         400          500          600  760 

Size  of  subdivisions,  degrees  F 1122222 

Each   2.50        2.65         3.30        3.95         4.62         4.95         5.80 

13640.  THERMOMETERS,   Solid  Stem,  Engraved  Scale,   for  Viscosity,   graduated  in  1/5°   divisions. 

Length,  8  inches.  No A  B  C 

Range,  degrees  F 98  to  108  128  to  138  208  to  218 

For  measuring  viscosity  at,  degrees  F 100  130 

Each   5.00  5.00  5.00 

13642.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  Viscosity,  graduated  in  1°  divisions.  Length, 

8  inches.  Xo A  B  C  D  E 

Range,  degrees  F 55  to  110    80  to  110    100  to  150    100  to  220    180  to  220 

Each 2.50  2.50  2.50  2.50  2.50 

9762.  THERMOMETERS,  Solid  Stem,  Engraved  Scale,  for  use  with  Xo.  9760  Saybolt  Viscosimeter. 

No A  B  C 

Range,  degrees  F 70  to  110     100  to  140     180  to  220 

Each   3.60  3.60  3.60 

9767.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  use  with  Xo.  9766  Scott  Viseosimeter.  Gradu- 
ated from  50°  to  120°  F.,  in  1/5°,  for  use  with  lubricating  oils 8.25 

9664.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Water  Bath  of  Xo.  9662  Bureau  of  Mines 

Flash  Tester.     Graduated  from  0°  to  85°  C.,  in  1°  divisions.     With  cylindrical  bulb 8.25 

13652.  THERMOMETER,  Solid  Stem,  Engraved  Scale,  for  Wax  Test,  graduated  from  80°  to  150°  F.,  in 
14°  divisions,  for  determining  the  melting  point  of  waxes,  paraffines,  and  greases.  Length, 

10  inches 3.30 

13658.  THERMOMETER,  Pocket,  Solid  Stem,  Engraved  Scale,  in  spiral-ribbed  aluminum  case.     Length, 

~>  inches.     Range,  0*  to  220°  F.,  in  2°  divisions    2.50 

13660.  THERMOMETER,  Pocket,  same  as  No.  13658,  but  with  Centigrade  scale.  Range,  0°  to  100°  C., 
in  1°  divisions 3.00 

13662.  THERMOMETER,  Pocket,  Maximum  Registering,    Solid   Stem,  Engraved   Scale;   in  aluminum 

case.     Length,  .",   inches.     Range,  0°   to  220°  F.,  in  2°  divisions 4.15 

13663.  THERMOMETER,  Pocket,  Maximum  Registering,  same  as  Xo.  13662,  but  with  Centigrade  scale. 

Range,  0°  to  100°  C.,  in  1°  divisions 4.15 


498 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  13666. 


No.  13670. 


13666.  THERMOMETERS,  Recording,  with  clock  movement  for  revolving  the   chart,  and  a  steel  coil 

spring  for  actuating  the  recording  pen  arm;  a  flexible  connecting  tube  through  which  the  ac- 
tion of  the  mercury  in  expanding  or  contracting  is  transmitted  from  the  sensitive  element 
(the  bulb)  to  the  coil  spring;  and  a  bulb  or  sensitive  element  which  is  inserted  at  the  point 
whose  temperature  is  to  be  determined.  The  spring,  the  steel  connecting  tube,  and  the  bulb 
are  welded  together,  forming  a  hermetically  sealed  mercury  filled  system.  In  black  enameled 
iron  case,  with  nickel-plated  ring,  complete  with  100  charts  divided  for  making  one  revolution 
in  seven  days,  extremely  sensitive  bulb  18  inches  long,  10  feet  of  flexible  protected  capillary 
tubing  (in  case  a  greater  length  of  tubing  is  desired,  state  exact  length  in  order  and  add  40c 
per  foot  for  each  foot  over  10)  and  supply  of  ink  and  pens. 

No A  B  C  D 

Range -40°  to  120°F.  30  to  230°F.  -20  to  60°C.  200  to  1000°F. 

Size  of  subdivisions,  degrees 2  5  1  10 

Each   $60.00  60.00  60.00  60.00 

Note: — Thermometers  of  other  ranges  will  bs  furnished  on  application;  also  for  24  hours  instead 
of  seven  days. 

13667.  CHARTS  for  No.  13666,  8  inches  in  diameter,  for  7  day  period. 

No "...          A  B  C  D 

Per  hundred 1.75  1.75  1.75  1.75 

13670.  THERMOMETER,    Recording,    Self    Contained,    for    obtaining    continuous    weekly    records    of 

weather,  room  or  incubator  temperatures.  The  case  is  12  inches  in  diameter,  finished  in 
weather-proof  black,  with  polished  bronze  hinged  front.  Range,  0°  to  130°F.  in  2°  divisions. 
Complete  with  lock  and  key,  one  hundred  7-day  charts  and  bottle  of  special  recorder  ink. 
50.00 

13671.  CHARTS  for  No.  13670 Per  hundred      3.30 

13676.  THERMOMETER,  Recording  (Thermograph).  Made  in  America.  A  most  accurate  thermometer 
which  will  not  vary  its  standard  for  years.  A  complete  record  is  given  by  a  pen  upon  a 
printed  chart  for  an  entire  week,  and  by  its  form  the  exact  thermometric  reading  can  be  seen 
at  any  moment,  as  well  as  the  varying  line  traced  by  the  pen  for  the  time  preceding.  The 
charts  are  changed  at  the  beginning  of  each  week  and  can  be  retained  as  a  record  for  the  entire 
year.  Mechanism  consists  of  a  spiral  lamina  of  non-rusting  material,  which  is  exposed  to  the 
atmosphere  at  the  end  of  the  case.  It  is  extremely  sensitive  and,  having  no  levers  in  its  con- 
struction, is  very  rigid.  In  non-corrosive  metal  case  with  glass  front  and  screened  openings 
on  three  sides  about  the  lamina,  and  with  storage  space  for  charts.  Range,  0°  to  100°  F.  in 
2°  divisions.  May  ordinarily  be  used  for  any  range  of  100°  F.  between  — 20°  and  +  250"  by 
means  of  No.  13683  Unfigured  Charts.  Complete  with  full  directions  for  use,  charts  for  one 
year,  pen  and  ink 50.00 

(For  illustration  of  No.  13676,  see  page  499.) 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A, 


499 


No.  13712. 


No.  13716. 


No.  13720. 


13678.  THERMOMETER,  Recording  (Thermograph).  Same  as  No.  13676,  but  with  charts  from  20°  to 
120°F  $50.00 

13680.  THERMOMETER,  Recording  (Thermograph).     Same  as  No.  13676,  but  with  unflgured  charts  for 

a  range  of  100°F.  in  2°  divisions 50.00 

13681.  THERMOGRAPH  CHARTS,  0°  to  100°F.,  for  use  with  No.  13676.     In  boxes  containing  a  year's 

supply Per  box      2.00 

13682.  THERMOGRAPH  CHARTS,  20°  to  120°F.,  for  use  with  No.  13678.     In  boxes  containing  a  year's 

supply    Per  box      2.00 

13683.  THERMOGRAPH  CHARTS,  Unfigured,  for  use  with  No.  13680.    Range,  100°F.  in  2°  divisions. 

In  boxes  containing  a  year's  supply Per  box      2.00 

13689.  THERMOGRAPH  CHARTS,  for  use  with  old  style  imported  high  drum  thermographs.  Style  No. 
46.  Range  — 62°  to  +128°F.  In  boxes  containing  a  year  'a  supply Per  box  2.25 

13691.  THERMOGRAPH  CHARTS,  for  use  with  old  style  imported  low  drum  thermographs.  Style  No. 
37.  Range  0°  to  100°F.  In  boxes  containing  a  year's  supply Per  box"  2.50 

13697.    BARO-THERMOGRAPH  CHARTS,  Style  No.  20.     In  boxes  containing  one  year's  supply. 

." Per  box      3.00 

13710.  THERMOMETER,  Soil,  Standard  Grade,  magnifying  tube,  mercury-filled,  mounted  on  15  inch 
turned  mahogany  frame  with  oxidized  brass  scale,  and  with  pointed  metal  end.  Range,  -30° 
to  180°  F ! 2.30 

13712.  THERMOMETERS,  Soil,  as  used  by  the  New  York  Agricultural  Experiment  Station.  With  solid 
stem  engraved  scale  thermometer  mounted  in  turned  wood  case  with  upper  part  cut  away  to 
expose  10  inches  of  the  scale  from  about  20°  to  120°  F.  Both  ends  are  protected  by  metal 
ferrules.  J 

No A  B  C 

For  use  at  depth,  inches 12  24  36 

Each   9.00  9.50  12.50 

13716.    THERMOMETER,  Three  Scale,  boxwood,  F.,  B.  and  C.  scales 80 

13720.  THERMOMETER,  Weather  Bureau  Standard,  12  inch,  cylindrical  bulb,  graduation  etched  on 
tube.  The  tube  is  mounted  on  an  aluminum  scale  on  which  is  marked  every  5  degree  line  of 
the  scale,  and  the  figures  every  10  degrees.  Has  brass  insulating  support  and  binding  screws. 
Approximate  range,  -30°  to  120^.  With  manufacturer's  certificate 6.00 

13724.  THERMOMETER,  Window,  for  weather  observations,  with  magnifying  tube,  alcohol  filled, 
mounted  on  nickel-plated  metal  back,  with  brackets  for  attachment  to  window  frame.  Length, 
10  inches;  approximate  range,  — 40°  to  120°F 1.20 

13728.  THERMOMETER,  Wood  Frame,  with  solid  stem,  engraved  scale  thermometer.  Floats  hori- 
zontally in  liquids.  No  metal  to  corrode.  Length,  12  inches;  range,  about  -20°  to  120°  F.  .80 


500 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  TI.  8.  A. 


No.  13756. 


No.  13748. 


No.  13744. 


13730. 


THERMOMETER  READING  ATTACHMENT,  designed  especially  for  use  with  Calorimeter  Ther- 
mometers. Supported  by  the  thermometer  stem,  thereby  maintaining  a  constant  angle  of 
vision  over  the  whole  scale $3.00 

13731.  THERMOMETER  READING  ATTACHMENT,  same  as  No.'  13730,  but  without  support. .         2.00 

1984.  THERMOMETER  READING  ATTACHMENT,  consisting  of  a  nickel-plated  brass  clamp  to  fasten 

011  the  thermometer  stem  with  an  adjustable  eyepiece 2.00 

13740.  THERMO-REGULATOR,  Electric,  DeKhotinsky  Bimetallic,  made  from  invar-brass  ribbon.  It 
can  be  set  at  any  desired  temperature  from  that  of  the  surrounding  atmosphere  or  less,  to 
250°  C.  or  higher  ;u  necessary.  The  precision  of  action  of  this  thermo-regulator  is  1/4°  C.  No 
relay  is  required  in  connection  with  it.  Maximum  capacity,  iy2  amperes 10.00 

13744.  THERMO-REGULATOR,  Electric,  DeKhotinsky  Standard,  for  precision  work  in  temperature  con- 
trol of  water  baths,  thermostats,  etc.  It  possesses  a  number  of  advantages  over  the  usual 
form.  To  reduce  the  lag  and  to  make  it  respond  quickly  to  changes  of  temperature  it  is  made 
of  steel,  which  has  about  66  times  the  thermal  conductivity  of  glass,  and  is  filled  with  mercury 
which  has  about  60  times  the  conductivity  of  toluene,  which  is  often  used  to  fill  thermo- 
regulators.  Attached  to  this  steel  tube  is  a  regulating  cap  provided  with  a  platinum  point, 
•which  makes  contact  with  the  surface  of  the  mercury  in  a  small  glass  capillary  tube,  so  that 
the  contact  is  visible.  This  capillary  is  ground  to  fit  exactly  the  metal  parts  of  the  head  so 
that  the  platinum  contact  point  is  exactly  centered.  When  the  regulator  is  to  be  used  in  water 
it  must  be  ordered  enclosed  in  a  thin-walled  brass  tube  to  prevent  rust.  The  sensitiveness  of 
this  thermo-regulator  depends  solely  on  tho  relation  between  the  diameter  of  the  capillary  and 
the  capacity  of  the  steel  tube  and  is  almost  unlimited.  A  relay  must  be  used  in  connection 
with  this  thermo-regulator,  as  the  current  which  passes  through  the  mercury-platinum  contact 
must  be  kept  infinitesimally  small.  Price  dependent  upon  length  and  accuracy  required. 
In  ordering,  specify  the  capacity  of  the  bath,  depth  of  water,  kind  of  current  and  accuracy  of 
regulation  desired. 

13748.  RELAY,  DeKhotinsky  Iron  Clad,  for  use  with  No.  13744  for  accurate  temperature  regulation. 
This  must  be  ordered  in  connection  with  No.  13744,  and  the  same  information  must  be  fur- 
nished. When  ordered,  complete  directions  will  be  furnished  including  a  wiring  diagram  show- 
ing all  connections  to  be  made.  Price  dependent  upon  conditions  to  be  met. 

13754.  THERMO-REGULATOR,  Electric,  simple  form,  consisting  of  a  strip  of  hard  rubber  and  metal 
riveted  together,  the  difference  in  their  expansion  causing  the  strip  to  bend,  thus  opening  or 
closing  an  electric  circuit  through  the  platinum  contact  points.  Useful  as  a  fire  alarm,  and  in 
roughly  controlling  the  temperature  in  hot-houses,  incubators  and  other  places  where  a  constant 
temperature  is  essential 2.25 

13756.  THERMO-REGULATOR,  Electric,  with  condenser,  for  use  in  incubators.  Will  control  tempera- 
tures automatically  to  %°  C.,  through  a  range  from  30°  C.  to  6C°  C.  Very  simple  in  construc- 
tion and  constant  in  operation.  For  full  description,  see  No.  7908 11.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


501 


N 


No.  13762.         No.  13766.  No.  13770.  No.  13772.    No.  13774.      No.  13778.        No.  13780.      No.  13784. 


No.  13786. 


No.  13806. 


13762.  THERMO-REGULATOR,  Gas,  Dunham's,  of  glass,  for  regulation  of  gas  flame.  Without  mer- 
cury    $2.00 

13766.  THERMO-REGULATOR,  Gas,  Greenman  Mercury,  constructed  entirely  of  steel,  widely  used  in 
connection  with  Greenman  Burner  No.  2102  for  heating  and  regulation  of  incubators.  A  brass 
jacket  is  supplied  for  the  thermo-regulator  which  is  to  be  filled  with  glycerine.  Length  of 
thermo-regulator  tube,  10  inches;  diameter  of  outer  jacket,  1  inch.  With  inlet  and  outlet  tubes 
threaded  with  %  inch  iron  pipe  thread  for  permanent  connection  with  gas  supply.  Without 
mercury .' 13.20 

13770.  THERMO-REGULATOR,   Gas,  Mercury-Toluene  type,  of  glass.     Length,  about  12  inches.       2.50 
13772.  THERMO-REGULATOR,  Gas,  same  as  No.  13770,   but   with   a  by-pass   to   keep  flame   burning. 

Without  screw  clamp 3.00 

13774.  THERMO-REGULATOR,  Gas,  same  as  No.  13770,  but  with  reservoir  and  glass  stop-cock  to  vary 

the  amount  of  mercury 7.50 

13778.  THERMO-REGULATOR,   Gas,  Reichert's,  of  glass  with  brass  adjusting  screw.      Length,  9% 

inches   4.80 

13780.  THERMO-REGULATOR,  Gas,  Reichert's  improved,  with  stop-cock  to  prevent  extinguishing  the 

flame 6.00 

13784.  THERMO-REGULATORS,  Gas,  Roux  Bimetallic,  operating  without  the  use  of  mercury  or  glass. 

Diameter  of  tube,  1  inch. 

Length,  inches 10  12 

Each  9.90  10.65 

13786.  GAS  FILTER  ATTACHMENT,  for  use  with  Nos.  13766  and  13784,  for  cleaning  the  illuminating 

gas  of  coal   tar  and  other  impurities.  . . . : 5.40 

For  GAS  PRESSURE  REGULATOR  for  use  with  Thermo-Regulators,  see  No.  7070. 
THERMOS  BOTTLES,  see  Vacuum  Bottles. 
THERMOSTATS,  see  Physical  Chemistry  Apparatus. 
THISTLE  TUBES,  see  Funnel  Tubes. 

13792.   THREAD,  Cotton,  White,  No.  70,  in  spools  of  150  yards Per  spool         .10 

Per  dozen      1.00 

13794.    THREAD,  Linen,  Black,  No.  30,  in  spools  of  200  yards. Per  spool          .40 

Per  dozen      4.00 

13796.    THREAD,  Silk,  Black,  No.  A,  in  spools  of  50  yards Per  spool          .10 

Per  dozen      1.00 

13800.    THUMB  TACKS,  stamped  steel,  made  of  one  piece,  head  $£6  inch Per  dozen        .09 

13806.  TIME  MARKER,  Electrically  Operated,  with  aluminum  stylus,  for  use  in  connection  with  No. 
F783  Metronome  (or  other  periodic  circuit  breaker)  and  a  Kymograph  (see  No.  F6065). 
Mounted  on  a  10  mm  rod  22  cm  long,  for  clamping  to  any  support.  Small  and  compact;  positive 
in  action  .  6.75 


502 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  13862. 


No.  13864. 


13810.  TIME  SWITCH,  for  automatically  disconnecting  electrically  operated  instruments  from  the  cir- 
cuit at  the  expiration  of  a  given  interval  of  time.  Consists  of  a  single  pole  knife  switch  oper- 
ated by  a  No.  3000  Interval  Clock  which  may  be  set  to  throw  the  switch  at  the  end  of  any  in- 
terval from  }4  minute  up  to  2  hours.  For  use  in  circuits  up  to  15  amperes.  Convenient  for 
use  with  electric  centrifuges,  incubators,  sterilizers,  shakers,  etc.  Complete  as  illustrated, 
mounted  on  slate  base  with  binding  posts $10.00 

TIN  BOXES,  see  Boxes. 

13818.  TONGS,  Crucible,  Single  Bent,  brass,  with  riveted  joint.    Length,  9  inches 65 

13820.  TONGS,  Crucible,  Single  Bent,  brass,  nickel-plated,  with  riveted  joint.    Length,  9  inches.         .95 

13824.  TONGS,   Crucible,   Double  Bent,   brass,   with  riveted  joint.    Length,  9  inches 35 

13826.  TONGS,  Crucible,  Double  Bent,  brass,  nickel-plated,  with  riveted  joint.    Length,  9  inches        .50 

13830.  TONGS,  Crucible,  Double  Bent,  steel,  with  riveted  joint.    Length,  9  inches 20 

13832.  TONGS,  Crucible,  Double  Bent,  steel,  nickel-plated,  with  riveted  joint.    Length,  9  inches        .30 
13836.  TONGS,  Crucible,  Double  Bent,  forged  steel,  nickel-plated,  with  lock  joint.    Length,  10  inches. 

With  corrugated  tips 3.00 

13840.  TONGS,  Crucible,  Double  Bent,  solid  nickel,  with  riveted  joint.     Length,  9  inches 1.00 

13842.  TONGS,  Crucible,  Double  Bent,  solid  nickel,  with  nickel-chromium  tips,  electrically  welded  on. 
The  tips  take  on  an  adherent  coating  which '  protects  hot  platinum  with  which  they  come  in 
contact.  With  riveted  joint 3.25 

13846.  TONGS,  Crucible,  Double  Bent,  steel,  nickel-plated  with  solid  platinum  tips;  lock  joint.  Length, 
8  inches.  Price  varies  with  market  price  of  platinum. 

13850.  TONGS,  Crucible,  Double  Bent,  solid  nickel,  with  solid  platinum  tips;  lock  joint.  Length,  8 
inches.  Price  varies  with  market  price  of  platinum. 

13854.  TONGS,  Crucible,  Double  Bent,  forged  steel,  nickel-plated  with  solid  Palau  tips;  lock  joint. 
Length,  10  inches.  Weight  of  Palau  tips,  about  4  grams 16.50 

13858.  TONGS,  Crucible,  Double  Bent,  steel,  nickel-plated,  with  riveted  joint.  For  use  in  handling  cru- 
cibles and  dishes  in  muffle  furnaces.  Length,  18  inches 3.00 

13862.  TONGS,  Crucible,  Single  Bent,  malleable  iron,  for  heavy  crucibles. 

Length,  inches  . .  1"  " 

Each 1-50  1.65 

13864.  TONGS,  Crucible,  Double  Bent,  wrought  iron,  for  heavy  crucibles.     Length,  30  inches. . .       1.80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


503 


O 


. 


No.  13866.  No.  13870.  No.  6020.  No.  13876.  No.  13878.  No.  13882. 


No.  13890  (Tools  only). 


No.  13894. 


13866 

13870, 

6020 


TONGS,  Crucible,  Double  Bent,  •wrought  Iron,  for  lifting  heavy  crucibles  vertically.     Length,  33 
inches.  "  For  crucibles  up  to  4  inches $1.80 

TONGS,  Crucible,  Julian's,  steel,  nickel-plated,  for  handling  crucibles  in  a  muffle  furnace.  Length, 
20  inches    .  2.50 


TONGS,  Cylinder  or  Crucible,  with  curved  jaws.    Designed  especially  for  use  with  No.  5906 
Baking  Cylinder.     Length,  24  inches 1.10 

13876.  TONGS,  Cupel,  steel,  with  bent  flat  ends.    Length,  30  inches 1.25 

13878.  TONGS,  Cupel,  steel,  with  curved  ends.     Length,  30  inches 1.25 

TONGS,  Gas,  see  Pliers. 

13882.  TONGS,  Scorifier,  spring  steel,  light.     Length,  30  inches 1.25 

13888.  TOOL  HOLDER,  with  hollow  wood  handle  and  ten  enclosed  tools.  Length  of  holder  over  all, 
6  inches.  Length  of  tools,  2 y2  inches .60 

13890.  TOOL  HOLDER.  Handle  similar  to  that  of  No.  13888,  but  larger  and  better  finished.  Has  9 
tools,  as  shown  in  the  illustration.  Length  of  handle  over  all,  7  inches.  Length  of  tools, 
3%  inches 1.60 

13894.    TOOL  SET  in  Case  of  polished  hardwood,  16x8V>x3%  inches,  containing  6-in.  and  1%-in.  ratchet 

screw  drivers,  hand  shave,  hack  saw  frame  with   11   blades  and   one  bone  saw,  glass  cutter, 

wood  handle  automatic  drill,  tool  handle  with   9  tools,  nail  set,  prick  punch,  saddlers'   drive 

i  !.  punch,  solid  punch,  and  oil  stone 11.00 


504 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


No.  13896. 


No.  13914. 


13896. 


13900. 


TOOL  SET  in  Case  of  polished  hardwood,  lexS^xS1/^  inches,  containing  6-in.  steel  try  square, 
6-in.  iron  level,  double  beam  roller  gauge,  washer  cutter,  gunsmiths'  screw  driver,  tool  holder 
for  small  square  shank  tools,  brass  hammer,  lever  metal  punch,  6-in.  and  l^-in.  ratchet  screw 
drivers,  hand  shave,  hack  saw  frame  with  11  blades  and  one  bone  saw,  glass  cutter,  wood 
handle  automatic  drill,  tool  handle  with  9  tools,  nail  set,  prick  punch,  saddlers'  drive  punch, 
solid  punch,  and  oil  stone  ........................................................  $18.70 

TOOL  SET  in  Chest  of  chestnut,  panelled  and  nicely  finished.  Contains  the  following  high  grade 
tools. 

Panel  saw,  brace,  3  gimlet  bits,  3  auger  bits,  3  chisels,  2  screw  drivers,  hack  saw  frame,  pocket 

level,  countersink,  scraper,  hammer,  tack  hammer,  tool  handle  with  10  tools,  spoke  shave,  block 

plane,  jack  plane,  2-foot  rule,  try  square,  marking  gage,  nail  sets,  wing  dividers,  gas  pliers, 

flat  nose  pliers,  nippers,  .saw  file,  oil  stone,  oil  can,  can  of  glue,  and  coping  saw.  Weight,  55  Ibs. 

.................................................................................     27.00 


Per  bolt 


TOOLS,  Miscellaneous,  see  various  headings,  as  Calipers,  Pliers,  Hammers,  etc. 

13906.    TOWELLING,  Crash,  good  quality,  16  to  17  inches  wide,  in  bolts  of  50  yards Per  yard 

TRANSITS,  see  Asbestos  Slate. 

TRANSITS,  see  Surveying  Instruments. 

TRAYS,  Germinating,  see  Grain  Testing  Apparatus. 

13914.    TRAYS,  Glass,  Photographic,  of  clear  flint  glass. 

No 

Size,  inches 

Each  . 


.17 
7.50 


B 


.27 


.30 


sy. 


13916. 
13920. 


TRAY,  Glass,  heavy,  6x8xiy2  inches  deep 

TRAYS,  Metal,  Photographic,  wire  bound  and  coated  with  acid-proof  japan. 


.40 


No. 

Size,  inches    

Each 

TRAYS,  Sampling,  see  Sampling  Apparatus. 
TRAYS,  Slide,  see  Microscope  Accessories. 
TRAYS  for  Soil  Analysis  Work,  see  Soil  Analysis  Apparatus. 
TRIANGLES,  Draftsman's,  see  Drawing  Instruments. 
TRIANGLES,  Glass  Dessicator,  see  No.  3804. 
13932.    TRIANGLES,  iron  wire,  twisted. 

No 

Length  of  side,  inches 

Each  

Per  dozen 

13934.    TRIANGLES,  iron  wire  covered  with  pipe  stems. 

No 

Length  of  side,  inside,  inches 

Each  

Per  dozen  . 


B 

7x9 
.45 


C 

8x10 
.60 


D 

10x12 
.90 


C 

xioy2 

.70 

.30 

E 

16x20 
2.50 


A 

1% 
.07 
.65 


.05 
.40 

B 
2 

.07 
.70 


.05 
.40 

C 

2% 
.08 
.75 


.05 
.40 

D 
3 

.08 
.80 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


505 


No.  13936. 


No.  13956. 


No.  13958. 


No.  13960. 


No.  13966. 


13936.   TRIANGLES,  iron  -wire  covered  with  pipe  stems  having  raised  centers,  so  that  the  crucible  rests 
on  these  points. 

No A  B  C 

Length  of  side,  inside,  inches 2  2M>  3% 

Each  $0.09  .10  .12 

Per  dozen 90  1.00  1.20 

13940.  TRIANGLES,  Nichrome  wire,  melting  point  about  3000°  F.,  non-corrodible,  costing  but  one-six- 
teenth as  much  as  platinum  and  lasting  longer  in  service. 

No A  B  C  D 

Length  of  side,  inside,  inches 1%  -  2%  3 

Each   16  .16  .22  .22 

13942.  TRIANGLES,  Nichrome  •wire,  covered  with  fused  silica  tubes,  superior  to  any  triangles  yet  pro- 
duced. 

No A  B  C  D 

Length  of  side,  inside,  inches 1%  2  2%  3 

Each   31  .31  .44~  .50 

13944.  TRIANGLES,  Hoskins'   Chromel,  made  of  h?avy  square-section  wire,  free  from  iron,  and  highly 
resistant  to  acids,  oxidation,  and  fusion. 

No A  B  C  D 

Length  of  side,  inside,  inches 1*4  2  2%  3 

Each   28  .28  .40  .40 

TRIANGLES,  Platinum,  see  Platinum  Ware. 

13950.  TRIANGLE  HOLDER,  adjustable,  for  Triangles  No.   10842,  with   clamp  for  attaching  to   sup- 

1.25 


13956. 
13958. 


port 
TRIPODS,  iron,  small,  for  alcohol  lamps.     Height,  6  inches;  diameter,  3»4  inches 

TRIPODS,  iron,  japanned,  with  easily  removable  legs  and  wide  rim.     Height,  9  inches. 
Diameter,  outside,  inches.. 


Each 


o 
.30 


6 
.35 


13960.    TRIPODS,  iron,  japanned,  same  as  Xo.  13958,  with  concentric  rings. 

No A  B 

Diameter,  outside,  inches 6 

Number  of  rings 2  3 

Each  .  .35  .50 


8 
.45 


C 

8 

4 

.70 


10 
.60 


D 
10 

5 
1.00 


12 
.70 


E 
12 

6 
1.30 


13966.  TRIPODS,  iron,  with  sheet  iron  chimney,  for  protecting  burner  flame  from  drafts.     Height  over 
all,  9  inches. 

Diameter,  inches 3V>  5  6 

Each   .  .90  L10  1.50 


506 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  13990. 


Nos.  13972-78. 


No.  13980. 


No.  13992. 


No.  14006. 


No.  14008. 


No.  H010. 


No.  14012. 


No.  14022. 


13972.    TROUGH,  Pneumatic,  of  japanned  tin  with  sliding  shelf  and  overflow;  students'  size,  41/!>x61/£xlO 

inches ?°-70 

13974.  TROUGH,  Pneumatic,  of  heavy  japanned  tin  with  sliding  shelf  and  overflow,  6x11x16  inches  1.60 
13978.  TROUGH,  Pneumatic,  heavy  galvanized  iron  with  sliding  shelf  and  overflow,  5x9x12  inches.  1.00 
13980.  SUPPORT,  Beehive,  for  use  with  Nos.  13972  to  13978,  for  supporting  the  inverted  receptacle  in 

collecting  gases;  of  zinc,  3  inches  in  diameter .40 

TROWEL,  6  inch  cold  rolled  steel  blade,  with  malleable  iron  shank  firmly  riveted  on  and  wood 

.12 


13988. 
13990. 
13992. 


handle 
TROWEL,  best  quality,  with  6  inch  blade  made  of  one  solid  piece  of  steel,  with  wood  handle. 

Will  outwear  all  others .55 

TROWEL,  Transplanting  or  Collecting,  with  narrow  and  deeply  curved  blade  6  inches  long,  and 

wood  handle.    Useful  with  the  collecting  case  or  as  a  transplanter,  dibber,  or  weed  digger         .15 
T  SQUARE,  see  Drawing  Instruments. 


14000. 
14002, 


14006. 
14008. 
14010. 
14012. 

14016. 
14020. 
14022. 


TUBES,  ALL  KINDS 

TUBES,  Absorption,  see  Absorption  Tubes. 

TUBE,  Air  Thermometer,  see  Air  Thermometer  Tubes. 

TUBES,  Arsenic,  see  Arsenic  Tubes. 

TUBES,  Calcium  Chloride,  see  Calcium  Chloride  Tubes. 

TUBES,  Centrifuge,  see  Centrifuge  Accessories. 

TUBES,  Color,  see  Colorimetric  Apparatus. 

TUBES,  Combustion,  see  Combustion  Tubes. 

TUBES,  Connecting,  Brass.     Approximate  length  of  arms,  1%  inches. 

No 

Diameter,  outside,  inches 

Diameter,  inside,  approx.,  inches 

TUBES,   T  shape 

TUBES,  Y  shape 

TUBES,  Connecting,  Glass. 

No 

Diameter,  outside,  mm 

Diameter,  inside,  mm 

Approx.  length  of  arms,  mm 

TUBES,  T  shape 

TUBES,  U  shape 

TUBES,  Y  shape 


A 

5 

3 

50 

.10 

.10 

.10 


B 

7 

5 

50 
.12 
.12 
.12 


9ie 
.40 
.40 

C 

8 

6 

60 
.20 
.20 
.20 


We 
.60 
.60 

D 
10 
8 

75 
.25 
.25 
.25 


C 

V, 

K« 

.70 
.70 

E 
12 
10 
100 
.40 
.40 
.40 


TUBE,  Connecting,  Glass,  T  shape,  with  two  stop-coeks.     Diameter  outside,  7  mm;  inside,  5  mm. 

3.00 

TUBE,  Connecting,  Lead,  Y  shape.     Diameter  outside,  8  mm;  inside,  5  mm.     Length  of  arms, 

about  1%  inches .30 

TUBE,  Connecting,  Hard  Rubber,  Y  shape.     Diameter  outside,  8  mm;  inside,  5  mm.     Length  of 

arms,  about  1  inch .15 

TUBE,  Connecting,  Reducer,  Brass,  for  connecting  ~/16  inch  to  %2  inch  tubing.  Without  threads. 
.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


507 


No.  F3355. 


No.  14030. 


No.  3102. 


TUBES,  Culture,  see  Test  Tubes. 

TUBES,  Drying,  see  Calcium  Chloride  Tubes. 

TUBES,  Fermentation,  see  Fermentation  Tubes. 

TUBES,  Filtering,  see  Filter  Tubes. 

TUBES,  Fractional  Distillation,  see  Distilling  Tubes. 

TUBES,  Fused  Silica,  see  Combustion  Tubes. 

TUBES,  Geissler,  see  Catalog  F  of  Physical  Apparatus. 

TUBE,  Hortvet,  see  Sugar  Analysis  Apparatus. 

TUBES,  Melting  Point,  see  Melting  Point  Tubes. 

TUBES,  Phosphorus,  see  Centrifuge  Accessories. 

TUBES,  Potato  Culture,  see  Test  Tubes. 

TUBES,  Pyrometer,  see  Pyrometer  Protection  Tubes. 

TUBES,  Transparent  Quartz,  see  Combustion  Tubes. 

TUBES,  SoU  Sampling,  see  Soil  Analysis  Apparatus. 

TUBES,  Specimen,  see  Test  Tubes. 

TUBES,  Test,  see  Test  Tubes. 

TUBES,  Vacuum  or  Dewar,  see  Vacuum  Tubes. 

TUBES,  Water  Analysis  Color,  sec  Color  Tubes. 

TUBES,  X  Ray,  demonstration  form,  see  Catalog  F  of  Physical  Apparatus. 

TUBING,  Flexible  Metallic,  see  Rubber  Tubing. 

TUBING,  Rubber,  see  Rubber  Tubing. 

TUBING,  SILICA,  see  Silica  Tubing. 

TUMBLERS,  Glass,  -with  lip,  see  Beakers. 

F3355.  TUMBLERS,  Glass,  Heavy,  capacity,  about  250  cc;  diameter  at  top,  60  to  65  mm. each  $0.06 

per  dozen        .60 
TUMBLERS,  Jelly,  see  Jars. 

14030.  TURBIDIMETER,  Jackson's,  for  determining  sulphates  in  water;  consisting  of  a  graduated  tube 

22  cm  long,  with  metal  ease  to  exclude  the  light,  and  a  support  for  tube  and  candle . . .     14.00 

14031.  CANDLES  for  use  with  No.  14030.  .  per  dozen       3.00 


14032.  GRADUATED  TUBES,  extra,  for  No.  14030. 

No 

Length,  cm 

Each    . 


A 

22 

2.50 


B 

75 
5.00 


14033.  BRASS  EXTENSION  for  use  with  No.  14030  when  using  long  graduated  tubes 4.50 

3102.  TURBIDIMETER,  United  States  Geological  Survey  Standard,  inade  of  aluminum,  8  inches  long, 
graduated  in  parts  per  million.  To  one  end  is  attached  a  tape  4  feet  long,  similarly  graduated. 
Into  the  other  end  is  fastened  a  nickel-plated  brass  screw  eye  containing  a  piece  of  rolled 
platinum  wire  to  be  viewed.  The  depth  of  its  disappearance  to  the  eye  indicates  the  turbidity. 
Complete  in  case.  (See  Bulletin  No.  151  of  the  United  States  Geological  Survey) 7.50 

TWINE,  Asbestos,  see  No.  312. 
14038.    TWINE,  Cotton,  3-ply Per  ball         .16 


14040.   TWINE,  Linen,  No.  9,  white Per  ball 


.45 


508 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TT.  8.  A. 


No.  14060. 


No.  14062. 


No.  14064. 


No.  14070. 


No.  14071. 


No.  14072. 


No.  14075. 


No.  14074. 


No.  10502. 


No.  156 


No.  14086. 


URINE  ANALYSIS  APPARATUS 


14060.  ALBUMINOMETER,  Esbach's,  for  the  quantitative  determination  of  albumin  in  urine;  gradu- 
ated to  read  grams  of  albumin  per  liter  of  urine.  Complete  with  directions $0.65 

14062.  ALBUMINOMETER,  Esbach's,  with  pointed  bottom,  for  testing  small  quantities,  on  foot       1.00 

14064.  ALBUMOSCOPE  (Horismascope),  for  the  detection  of  albumin  in  urine  ith  nitric  acid.  With 
this  instrument  the  nitric  acid  comes  in  contact  with  the  urine  in  full  strength,  thus  rendering 
the  test  much  more  delicate  than  ordinarily,  1/60  per  cent,  of  albumin  being  detectible.  Com- 
plete with  directions  for  use 1.25 

14066.  FEHLING'S  SOLUTION,  tablet  form  for  use  in  Urine  Analysis,  sufficient  to  make  one  ounce  of 
solution 25 

FOLIN'S  APPARATUS  FOR  THE  DETERMINATION  OF  AMMONIA,  TOTAL 

NITROGEN  AND  UREA  IN  URINE 

(See  Journal  of  Biological  Chemistry,  Vol.  XI,  No.  5.  for  June  1912.). 

14070.  AMMONIA  ABSORPTION  TUBE,  small,  with  perforated  end,  265  x8  mm 20 

14071.  AMMONIA  TRAP,  Glass 50 

14072.  CONDENSER  TUBE,  for  urea,  250  x  15  mm 30 

14074.  FUME  ABSORPTION  TUBE,  straight,  for  bending  to  desired  shape  in  the  laboratory.  .  .          .60 

14075.  CONNECTING  TUBE  or  Manifold  for  use  with  No.  14074  Absorption  Tubes. 

No A  B  C 

Number  of  arms 4  5  6 

Each    90  1.00  1.20 

10502.  OSTWALB  PIPETTES,  graduated  to  deliver  exact  amounts  at  20°C.  Capacity,  cc         1  2 

Each   1.00         1.00 

13364E.  TEST  TUBE,  non-corrosive  glass,  200  x  25  mm 15 

14078.  TEMPERATURE  BULB,  filled  with  mercury  chloride-iodide 40 

156.  AMMONIA  ABSORPTION  APPARATUS,  Folin's,  complete  with  cylinder,  two  hole  rubber  stop- 

per, drying  tube,  Folin  Absorption  Tube  No.  157  and  bottle 3.25 

157.  AMMONIA  ABSORPTION  TUBE  only  of  No.  156 1.60 

14086.  PURINOMETER,  Hall's,  for  the  riuan'titative  determination  of  purin  nitrogen  in  urine.      With 

glass  stop-cock,  glass  stopper  and  wooden  base,  graduated  from  0  to  100  cc  in  1  cc 10.00 

14087.  TEST  SOLUTION  No.  1,  for  use  with  No.  14086 . .  .per  6  oz.  bottle         .50 

14088.  TEST  SOLUTION  No.  2,  for  use  with  No.  14086 per  6  oz.  bottle         .55 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


509 


No.  14098.  No.  14102. 


No.  14116.  No.  14120.  No.  14122.  No.  14126. 

14092.  SACCHAEOMETER,  Einhorn's  Fermentation,  for  the  estimation  of  sugar  in  urine.     Consists  of 

a  graduated  fermentation  tube  on  foot  and  a  graduated  test  tube.  The  percentage  of  sugar 
is  read  directly  on  the  tube. $0.75 

14093.  GRADUATED  TEST  TUBE  only  for  No.  14092 30 

14096.  SACCHAROMETER,  Einhorn's  Fermentation,  set  of  two,  one  for  the  urine  under  examination, 

the  other  for  normal  urine  to  which  glucose  has  been  added  to  test  the  efficiency  of  the  yeast 

used.     With  graduated  test  tube 2.00 

14098.  SACCHAROMETER,  Lohnstein's  for  the  accurate  determination  of  sugar  in  diluted  urine.  Com- 
plete with  graduated  test  tube,  in  case  -with  directions  for  use 2.50 

14102.  UREA  APPARATUS,  Folin,  for  the  determination  of  urea  in  urine,  consisting  of  an  Erlenmeyer 

flask  with  one-hole  rubber  stopper,  and  special  urea  bulb 1-75 

14103.  UREA  BULB  only  for  No.  14102 1.20 

14106.  UREA  APPARATUS,  Van  Slyke-Cullen,  for  the  determination  of  urea  in  blood  and  urine.     The 

apparatus  consists  of  9  heavy  walled  glass  test  tubes  fitted  with  two-hole  rubber  stoppers, 
through  which  are  inserted  Folin  Ammonia  Absorption  Tubes  and  connecting  tubes,  mounted 
in  a  heavy  wooden  block.  Complete  with  rubber  connecting  tube,  brass  Filter  Pump  No.  5476A, 
Coupling  No.  5480A,  and  a  5  gram  bottle  of  urease.  (See  Journal  of  Biological  Chemistry,  Vol. 
XIX,  page  211,  1914) : 11.00 

14107.  FOLIN  AMMONIA  TUBES  only  of  No.  14106 each         .55 

14108.  CONNECTING  TUBES  only  of  No.  14106 each         .20 

14109.  TEST  TUBES  only  of  No.  14106 each         .35 

14110.  UREASE  for  No.  14106 per  5  gram  bottle         .75 

14114.  UREOMETER,  Doremus',  for  the  rapid  quantitative  determination  of  urea  in  urine  by  the  hypo'- 

brornate  method.  Consists  of  a  graduated  pipette  and  a  fermentation  tube  graduated  to  read 
to  1/10  per  cent.  Complete  with  directions  for  use 1-00 

1411fi.  UREOMETER,  Doremus',  same  as  No.  14114,  on  glass  foot 1.00 

14117.  DROPPING  PIPtiTTE  only  for  Nos.  14114  and  14116,  graduated  at  1  cc 15 

5290.  SUPPORT,  Hardwood,  with  brass  clips,  for  No.  14114 1.00 

14120.  UREOMETER,  Doremus'-Hinds,  with  glass  stop-cock  and  side  tube  graduated  in  tenths  of  a  cc 
for  delivering  accurate  amounts  of  urine  without  permitting  the  escape  of  gas  from  the  bulb. 
On  glass  foot 3.60 

14122.  UREOMETER,  Squibb's,  for  the  approximate  determination  of  urea  in  urine  by  displacement. 
Complete  with  50  cc  bottle  of  reagent,  vials,  graduated  pipette,  graduated  cylinder,  with  direc- 
tions for  use 3.50 

14126.  URICOMETER,  Ruhemann,  for  estimating  directly  the  amount  of  uric  acid  in  urine  in  parts  per 
1000 5.00 


510 


CENTKAL  SCIENTIFIC  CO.,  CHICAGO,  IT.  S.  A. 


No.  14150. 


No.  14156. 


No.  14164. 


14130.  TJRINOMETER,  Squibb's,  for  the  determination  of  the  specific  gravity  of  urine.  Length,  5  inches. 
Graduated  from  1.000  to  1.060.  Guaranteed  accurate  for  temperatures  of  77°  F.  In  case,  with 
fluted  cylinder  and  directions,  without  thermometer  $0.90 

14132.  TJRINOMETER,  Squibb's.     Same  as  No.  14130,  but  with  thermometer  in  float  body,  with  scale  of 

corrections  for  temperature 4.50 

14133.  CYLINDER  only  of  Nos.  14130  and  14132 35 

14136.  TJRINOMETER,  small  size,  for  testing  1  fluid-ounce   or   30   cc   samples.      With   specific   gravity 

scale  1.005  to  1.035  in  0.001  graduations,  with  spines  on  body  to  prevent  clinging  to  sides  of  jar. 

Complete  with  test  jar  graduated  in  %  ounce  and  5  ce  divisions  with  lip 1.80 

14138.  TJRINOMETER,  small  size,  same  as  No.  14136  with  separate  thermometer  showing  corrections 

for  temperature   3.00 

URINE  SEDIMENT  GLASSES,  see  Test  Glasses. 

14150.  VACUUM  BOTTLES,  for  keeping  hot  liquids  hot  and  cold  liquids  cold,  with  re-enforced  vacuum 

chamber.  Supplied  with  large  size  drinking  cup,  securely  fastened  to  the  case,  preventing  leak- 
age of  the  contents  through  loosening  the  eork.  Finished  in  red  japan,  with  nickeled  top  and 
base. 

No A  B 

Capacity pint  quart 

Each 1-V5  2.75 

14151.  GLASS  BOTTLES  only  for  No.  14150,  for  replacement. 

No A  B 

Each 1-25  2.00 

VACUUM  PUMPS,  see  Pumps,  Air. 

VACUUM  TUBES,  Dewar's,  double  walled,  for  liquid  air  experiments. 

No A  B  C  D 

Length,  outside,  cm 10  20  30  35 

Diameter,  outside,  cm 4.5  5.5  6.5 

14154.  TUBES,  Silvered 4.00  5.40  11.00  19.50 

14156.  TUBES,  Unsilvered   3.30  4.50  10.00  18.00 

VALENCE  BLOCKS,  see  Models. 

VAPOR  DENSITY  APPARATUS 

14164.  VAPOR  DENSITY  APPARATUS,  Dumas,  complete  with  kettle  and  bulb  support,  but  without 

thermometer  or  bulbs 15.00 

856.  DUMAS  BULBS  for  No.  14164,  capacity  about  200  cc each        .35 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


511 


No.  14170. 


No.  14178. 


No.  14188. 


No.  14192. 


14170.  VAPOR  DENSITY  APPARATUS,  Victor  Meyer,  complete  with  outer  jacket  of  glass,  25  inches 

long  and  1%  inches  in  diameter,  inner  tube  33  inches  long,  without  bottle  for  containing  the 
liquid  to  be  tested $2.25 

14171.  BOTTLES,  small,  glass  stoppered,  for  use  with  No.  14170 Each  .30 

Per  dozen      3.30 

14172.  INNER  TUBE  only  of  No.  14170,  with  side  arm 1.10 

14173.  OUTER  JACKET  only  of  No.  14170,  of  glass 1.25 

14174.  OUTER  JACKET  only  of  No.  14170,  of  copper,  according  to  McCoy 6.00 

'  14178.  VAPOR  DENSITY  APPARATUS,  Weiser's  Modification  of  Victor  Meyer's,  designed  to  shorten 
the  apparatus  while  retaining  all  the  desirable  features  of  the  original.  Length  of  outer  jacket, 
32  cm;  diameter  of  outer  jacket,  6  cm;  capacity  of  vaporization  bulb,  about  125  ee.  Complete 
as  described  with  2  glass  stoppered  bottles.  (See  Journal  of  Physical  Chemistry,  Vol.  XX, 
No.  6,  page  532,  for  June  1916) 2.25 

14179.  INNER  TUBE  only  of  No.  14178 1.10 

14180.  OUTER  JACKET  only  of  No.  14178 1.25 

VASCULUM,  see  Botanical  Apparatus. 

VERNIER  CALIPERS,  see  Calipers. 

VIALS,  see  Bottles. 

VISCOSITY  PIPETTE,  see  Physical  Chemistry  Apparatus. 

VTSCOSIMETERS,  see  Oil  Testing  Apparatus. 

14188.   VISES,  Anvil,  adjustable  jaws,  strongly  constructed.     Base  is  drilled  to  fasten  rigidly  to  bench 
bv  screws. 

"No A  B  C 

Width  of  opening,  inches 3  5 

Width  of  jaw,  inches 2%  3%  4 

Weight,  pounds   9  25  35 

Each  6.50  8.10  10.00 

14190.   VISES,  Anvil  with  Clamp.     Provided  also  with  a  steel  base  drilled  to  fasten  rigidly  to  bench  by 
screws. 

No A  B 

Width  of  opening,  inches 2^  3% 

Width  of  jaw,  inches 2*4  2% 

Weight,  pounds   5% 

Each 3.00  4.20 

14192.   VISES,  Anvil  with  Clamp,  Small.    Very  convenient  for  laboratory  use. 

No A  B 

Width  of  opening,  inches 1%  1% 

Width  of  jaw,  inches !% 

Weight,  pounds  

Each  .  1-20  1.80 


512 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  14196. 


No.  14224. 


No.  14228. 


No.  14230. 


No.  14236. 


14196.  VISE,  Hand,  with  parallel  jaws.  Very  convenient  and  useful.  Made  from  drop  forgings,  with 
the  faces  of  the  jaws  scored  and  case  hardened.  The  faces  of  the  jaws  are  1%0  inches  long, 

%  inch  wide;  jaws  open  1%  inches;  whole  tool  4%  inches  long.     Black  finish $2.00 

VOLTMETERS,  see  Electrical  Instruments. 

VOLUME  OF  LOAF  APPARATUS,  see  Flour  Testing  Apparatus. 
WARMING  TABLE,  see  Nos.  8862,  8864,  and  8936. 
WARM  STAGES,  see  Microscope  Accessories. 

14214.  WASHER  CUTTER.  A  strong,  well  made,  useful  device  for  cutting  washers  of  diameter  from 
%  in.  to  5%  in.  Provided  with  removable  blade  adjustable  as  to  length  of  cutting  edge  as 
well  as  position.  These  blades  can  easily  be  eemoved  for  sharpening  or  replaced  when  they 

wear  out.     Nicely  polished  and  attractive  in  appearance  2.25 

WASHING  BOTTLES,  see  Bottles. 

WASHING  BOTTLES  for  Gas,  see  Gas  Washing  Bottles. 
WASHING  PANS  for  Gold,  see  Pans. 
14220.  WASTE  CAN,  Galvanized,  14x14%  inches;  capacity,  9%   gallons;   with   seamless   cover   fitting 

over  outside 3.00 

WASTE  JARS,  see  Jars. 
WASTE  PAIL,  see  Pails. 
14224.    WATCH  GLASSES,  well  annealed,  with  edgos  smoothly  ground. 

Diameter,  inches...       1%          2        2'/i       3        3%         4         4%  5  67  8 

Per  dozen 40        .50      .60      .70      .90      1.00       1.20      1.30       1.60      1.80      2.00 

14226.  WATCH  GLASSES,  in  Pairs,  with  edges  ground  to  fit  accurately  together,  for  use  with  Clamps 
Nos.  2902-4. 

Diameter,  inches 2 

Per  pair 20 

14228.  WATCH  GLASSES,  in  Pairs,  same  as  No.  14226,  with  Clamp  No.  2902. 

Diameter,  inches 2 

Per  pair  with,  clamp 32 

14230.  WATCH  GLASSES,  in  Pairs,  same  as  No.  14226,  with  Clamp  No.  2904. 

Diameter,  inches 2 

Per  pair  with  clamp 30 

WATCH  GLASS  CLAMPS,  see  Clamps. 
824.  WATCH  GLASSES,  Counterpoised,  for  use  on  balance  pans. 

Diameter,  mm 50  62 

Per  pair 90  1.00 

WATCH  GLASSES,  Embryological,  see  Dishes,  Staining. 
14236.    WATCH  GLASSES,  Syracuse,  plain;  outside  diameter  65  mm;  inside  diameter,  50  mm.    Grooved 

to  facilitate   stacking Per   dozen         .70 

14238.    WATCH  GLASSES,  Syracuse,  same  as  No.  14236,  with  beveled  surface  ground  for  writing. 

Per  dozen      1.00 

14244.    WATCH  SPRINGS,  for  burning  in  oxygen Per  dozen         .20 


2V> 
.25 

2V> 
.37 

2% 
.35 


75 
1.25 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


513 


O.  14258. 


No.  14268. 


WATER  BATHS 

14250.  WATER  BATHS,  polished  copper,  tin  lined,  with  concentric  copper  rings  and  cover,  handles 
and  steam  escape. 

Diameter,  inches 4  5  6  8  10 

Number  of  rings 3  4  5  6  8 

Each  $1.30  1.45  2.00  3.20  5.00 

14252.    WATER  BATHS,  for  Steam  Hjat,  same  as  No.  14250  with  steam  valve  and  waste  pipe. 

Diameter,  inches 6  8  10 

Each  5.40  6.60  9.10 

14254.    WATER  BATHS,  polished  copper,  same  as  No.  14250,  with  constant  water  level. 

Diameter,  inches  4  5  6  8  10 

Number  of  rings 3  4  5  6  8 

Each   1.80  2.00  2.25  2.70  5.00 

14258.  WATER  BATH,  polished  copper,  with  5  concentric  rings  and  water  level  regulator.     Diameter, 

6  inches;  depth,  4  inches.       Complete  with  iron  tripod  9  inches  high 6.00 

14262.  WATER  BATHS,  seamless  polished  copper,  tin  lined,  with  copper  concentric  rings  and  cover, 
steam  escape,  handles,  flange  for  tripod,  and  perforated  plate  for  test  tubes  up  to  %  inch  in 
diameter. 

Diameter,  inches 6  8 

With  plate  for,  tubes 12  19 

Each    4.50  6.50 

14264.  WATER  BATHS,  same  as  No.  14262,  with  tripod  and  copper  rack  for  test  tubes  up  to  %  inch  in 
diameter. 

Diameter,  inches 6  8 

For  test  tubes 12  19 

Each   5.00  7.00 

14266.  WATER  BATH,  for  dissolving  steel  samples,  of  polished  copper,  tin  lined,  with  zinc  tray  for  18 

test  tubes  6  x  %  inch.     Diameter,  6  inches;  Height,  7  inches 5.00 

14268.  WATER  BATH,  for  dissolving  steel  samples,  square  form,  7%  x  7^  x  6M>  inches  high,  of  pol- 
ished copper,  tin  lined,  with  tray  for  25  test  tubes  8  x  %  inch.  Mounted  on  heavy  iron  sup- 
port   '. 7.50 


514 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


-I? 


Nos.  14290-1. 


No.  14202. 


14272. 


14274. 
14276. 

14278. 
14282. 


14288. 


14290. 


14291. 
14292. 


WATER  BATH,  rectangular  form,  with  4  openings  5  inches  in  diameter,  with  concentric  rings, 
and  cover,  stop-cock  for  draining,  constant  water  level  regulator,  tubulatures  for  thermometer 
and  thermo-regulator,  and  an  extra  sheet  iron  bottom,  mounted  on  heavy  iron  support.  Dimen- 
sions, 14  inches  square  by  5  inches  deep $21.00 

WATER  BATH,  same  as  No.  14272,  but  with  coil  for  steam  heat 25.00 

WATER  BATH,  of  similar  construction  to  No.  14272,  but  with  7  openings,  3  of  6  inches  diameter, 

and  4  of  4  inches.     Dimensions,  23  x  13  ^  x  5  inches  deep 27.50 

WATER  BATH,  same  as  No.  14276,  but  with  coil  for  steam  heat 31.50 

WATER  BATH,  Electrically  Heated,  with  cup  of  seamless  copper  nickel-plated  and  concentric 
rings.  Provided  with  self-enclosed  heater,  and  with  automatic  cut-out,  which  shuts  off  the 
current  if  the  vessel  boils  dry.  It  will  boil  1  quart  of  water  in  6  minutes.  Diameter,  4  inches; 
capacity,  1  quart;  power  consumption,  550  watts.  Complete  with  6  feet  of  silk  covered  cord 

and  attachment  plug  for  connection  to  any  110  volt  lamp  socket 22.00 

WATER  BATH,  Agar  Melting,  gas  heated,  for  keeping  agar  liquefied  for  inoculation  previous  to 
pouring  into  Petri  dishes.  Made  of  heavy  copper  tinned  inside,  with  lid  which  slopes  from  the 
center  to  all  four  sides  preventing  moisture  from  dripping  into  the  tubes.  Troughs  are  ar- 
ranged along  the  sides  to  carry  off  the  condensed  moisture.  Provided  with  tubulations  for  ther- 
mometer and  thermo-regulator.  Complete  with  six  tinned  wire  test  tube  baskets,  S1^  x  3%  x6 
inches,  and  with  cast  iron  support  stand  8%  inches  high.  Height  over  all,  18  inches;  length, 

11%  inches;  width,  7%  inches.     Without  burner 35.00 

WATER  BATH,  Alsop's,  as  used  in  tanning  and  leather  laboratories.  Of  heavy  copper  with  con- 
denser at  top  which  may  be  used  to  furnish  distilled  water.  Length  inside,  25  inches;  width 
inside,  20  inches;  capacity,  60  crystallizing  dishes  80  mm  in  diameter.  For  gas  heat..  200.00 

WATER  BATH,  Alsop's,  same  as  No.  14290,  but  .with  coil  for  heating  by  steam 215.00 

WATER  BATH,  Blair's,  with  rack  for  10  test  tubes;  as  used  in  iron  analysis.  Of  polished  cop- 
per, 7  inches  in  diameter 4.75 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A.  513 


No.  14296. 


14296.  WATER  BATH,  DeKhotinsky,  Electrically  Heated,  intended  to  replace  the  ordinary  Bunscn 
burner  heated  bath,  in  laboratories  where  electric  current  is  available.  The  bath  consists  of 
a  copper  container  \<,  mm  (0.02  inch)  thick,  spun  in  one  piece  and  nickel-plated.  It  is  lagged 
with  25  mm  (1  inch)  of  magnesia-asbestos  and  protected  outside  by  red  fiber.  The  bath  is 
attached  to  an  enameled  cast-iron  base,  fitted  with  a  nickel-plated  supporting  rod,  to  which 
laboratory  clamps  may  be  attached  for  the  support  of  flasks,  condensers,  etc.  The  top  of  the 
bath  is  fitted  with  a  set  of  six  porcelain  rings  to  accommodate  the  different  sizes  of  flasks  or 
evaporating  dishes. 

Capacity  of  bath 1000  cc.  Height  (without  stand) 12.5  cm. 

Volume  of  container 1400  cc.  Height   (inside) 9.5  cm. 

Diameter  (outside) 19  cm.  Height  (with  stand) 18.5  cm. 

Diameter  (inside)   14  cm.  Weight lOlbs. 

Four  electric  heating  units  of  44  watts  each  are  used  to  supply  heat  to  the  bath.  These  units  may  be 
added  one  by  one,  by  means  of  the  switch  which  constitutes  a  part  of  the  bath,  and  the  desired 
temperature  thus  secured.  The  bath  has  a  constant  water  level  attachment,  by  means  of  which 
the  water  level  may  be  kept  constant  at  any  point  within  a  range  of  25  mm  (1  inch).  The  regu- 
larity of  the  water  level  is  1  mm. 

The  following  table  shows  the  capacity  of  the  bath: 

Number  of  heating  units 3  2  1 

Total  energy  consumed,  watts 132  88  44 

Temperature  maintained,  C 100°  95°  72° 

With  four  heating  units  (176  watts)  the  boiling  is,  of  course,  more  rapid. 

As  the  heating  units  are  inserted  in  brass  tubes  placed  permanently  inside  of  the  bath,  20  mm 
from  the  bottom,  their  heating  value  come?  to  99  per  cent,  of  the  theoretical  expenditure  of 
energy.  Placed  as  they  are,  the  heating  units  are  absolutely  protected  from  accidental  injury. 
To  replace  these  units  takes  no  more  time  or  skill  than  to  replace  an  incandescent  lamp  in  its 
socket.  This  bath  operates  on  either  a  direct  or  alternating  current,  and  may  be  attached  to 
any  Edison  socket.  Complete  as  describe.!,  without  glassware. 

No A  E 

For  volts   110  220 

Each   $27.50  30.00 

HEATING  UNITS,  extra,  for  No.  14296,  44  watts  each. 

No 7526A  7527A 

For  volts   110  220 

Each   1.00  1.25 


rie 


CENTKAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


14300. 
14301. 
14302. 
14303. 


WATER  BATH,  DeKhotinsky,  Electrically  Heated  and  Regulated  (Patented),  intended  for  use 
in  modern  chemical,  physical  and  bacteriological  laboratories,  where  constant  temperature  is 
imperative.  It  consists  of  a  copper  container  %  mm  (1/32  inch)  in  thickness,  heavily  nickel- 
plated  inside  and  out,  lagged  with  25  mm  (1  inch)  magnesia-asbestos  (magnesia  85%),  and  pro- 
tected outside  by  a  sheet  of  Russia  iron.  The  bath  is  attached  to  an  enameled  cast-iron  base, 
supplied  with  three  nickel-plated  rods,  to  which  may  be  attached  laboratory  clamps  for  sup- 
porting flasks,  etc.  Each  bath  is  fitted  with  four  electric  heating  units,  three  of  which  may 
conveniently  be  added  one  by  one,  by  means  of  the  switch  constituting  part  of  the  bath.  The 
fourth  unit  is  electrically  connected  to  the  relay,  which  is  automatically  operated  by  a  thermo- 
regulator. 

The  thermo-regulator  consists  of  a  solid  drawn-steel  tube,  brass  covered,  nickel-plated,  filled 
with  mercury,  with  a  platinum  contact  attached  to  a  regulating  cap,  by  means  of  which  the 
bath  can  be  regulated  and  set  to  the  desired  temperature,  ranging  from  the  temperature  of  the 
surrounding  atmosphere  to  the  boiling  point  of  water.  Should  a  temperature  higher  than  the 
boiling  point  be  needed,  the  water  may  be  replaced  by  Crisco,  which  can  be  used  up  to  a  tem- 
perature of  165°  C.,  or  even  higher.  For  temperatures  within  2  degrees  of  room  temperature 
and  lower,  No.  14306  Cooling  Coil  must  be  used.  With  this  bath,  when  provided  with  a  No. 
12864  High  Speed  Turbine  Stirrer,  the  temperature  can  be  held  constant  to  1/10  degree  C., 
over  long  periods  of  time. 

A  constant  water  level  attachment  is  furnished  with  each  bath,  by  means  of  which  the  water 
level  can  be  regulated  within  a  range  of  35  mm  (IVi  inch)  and  maintained  within  1  mm  of  the 
level  at  which  it  is  set.  This  bath  has  a  very  good  natural  circulation,  as  heat  is  supplied  in- 
side the  bath  25  mm  from  the  bottom.  When  experiments  or  research  demand  a  more  vigorous 
circulation  and  regulation  closer  than  1/10°  C.,  a  small  High  Speed  Turbine  Stirrer  No.  12864  can 
be  attached  to  the  bath.  This  stirrer  of  18  mm  diameter  takes  water  from  the  bottom  of  the  bath 
at  the  rate  of  five  liters  per  minute,  and  delivers  it  at  the  top  with  an  energy  expenditure  in 
the  motor  of  15  watts.  On  the  shaft  of  the  circulation  turbine  is  an  extra  pulley  to  connect 
with  the  glass  stirrer  in  the  flask.  Complete  with  water  bath,  four  heating  units,  relay,  thermo- 
regulator,  constant  water-level  device,  support  rods,  five  feet  of  cord  and  attachment  plug.  If 
uniformity  of  temperature  throughout  bath  is  desired,  stirrer  should  be  included. 

No A 

Capacity,  liters 9.3 

Diameter  inside,  cm 25 

Available  height  inside,  cm 19 

For  110  volts  A.  C $75.00 

For  220  volts  A.  C 77.50 

For  110  volts  D.  C 72.50 

For  220  volts  D.  C 75.00 

Note: — In  ordering  state  mean  temperature  desired,  so  that  heating  units  of  correct  wattage  may 
be  furnished. 


B 

18.25 
30.5 
25 

98.50 

101.00 

96.00 

98.50 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


517 


No.  14312. 


No.  14316. 


A 

A 


A 
A 
22 
5 

Me 
6.00 


B 
B 

10.00 


c 

B 
30 

8 

fo 
7.00 


14306.  COOLING  COLL,  for  use  in  Water  Baths  No.  14300,  of  copper  nickel-plated. 

No 

For  Bath  No 

Each    

HEATING  UNITS,  extra,  for  No.  14300,  see  Nos.  7526-7. 
12864.  STIRRERS,  High  Speed  Turbine,  for  use  with  Nos.  14300-3. 

2*o 

For  Nos.  14300-3 

Diameter,  mm 

Capacity,  liters  per  minute 

Power  required  to  operate,  h.  p 

Each    

14310.  WATER  BATH,  Griffin's,  for  hot  filtration  and  evaporation.  Of  heavy  copper,  tin  lined,  with 
two  5  inch  openings  in  the  top.  One  opening  is  fitted  with  a  copper  funnel,  the  other  is  pro- 
vided with  four  concentric  copper  rings.  Complete  with  constant  water  level  regulator  and 
tubulatures  for  thermometer  and  thermo-regulator,  mounted  on  support  with  extra  sheet  iron 

bottom  and  detachable  legs.     Dimensions,  13  x  7  x  5  inches  high 13.00 

14312.  WATER  BATH,  Hofmann,  of  polished  copper,  tin  lined,  with  a  set  of  concentric  rings  and  a  plate 
with  five  different  sized  openings,  each  with  cover.  Diameter  at  top,  8  inches;  depth,  5  inches; 

with  constant  water  level  and  handles 15.50 

WATER  BATH,  Victor  Meyer's,  funnel  shape,  of  polished  copper,  tin  lined,  w.th  concentric  rings, 

cover  and  constant  water  level,  with  tripod  8  inches  high.     Diameter,  6  inches 5.50 

WATER  BATH,  Wassermann,  with  12  copper  racks,  each  of  which  holds  12  tubes  4x  %  inches. 
These  racks  are  so  aranged  that  they  can  be  lifted  out  of  the  bath  by  the  two  handles  attached 
to  each  of  the  racks,  and  are  also  supplied  with  a  center  division  to  allow  shaking  of  the  test 
tubes  without  danger  of  dropping.  The  bath  is  made  of  heavy  polished  copper,  with  a  per- 
forated bottom,  thereby  providing  for  a  large  volume  of  water.  Complete  with  thermometer, 
glass  thermo-regulator  for  controlling  the  temperature,  and  12  copper  racks.  Height  over  all, 
13%  inches;  length,  12%  inches;  width,  12%  inches;  depth,  5%  inches.  With  sheet  iron  base 

8  inches  high.     Without  burner 35.0C 

14323.  SUPPORTS,  Test  Tube,  only  for  No.  14322,  for  tubes  4  x  %  inches. 

No A  B  C 

For  tubes 12  24  40 

Each 1.30  2.00  2.60 

TEST  TUBES,  Wassermann,  see  No.  13390. 


14316. 

14322. 


518 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Nos.  14326-8. 


PATfAPPLD.  FOB 


No.  14332. 


14326.  WATER  BATH,  Wassermann,  round  form,  of  copper  tin  lined,  with  copper  rack  for  holding  28 
test  tubes  3  x  %  inches,  and  with  tubulatures  for  thermometer  and  thermo-regulator,  mounted 
on  sheet  iron  base,  4  inches  high.  Diameter,  6  inches;  depth,  4  inches.  Without  heater  or 
thermo-regulator $12.00 

14328.  ELECTRIC  HEATER  AND  THERMOSTAT,  Combined,  for  No.  14326.  Consisting  of  a  heating 
disk  5  inches  in  diameter  by  %  inch  in  thickness,  mounted  with  an  adjustable  pencil-type 
electro-thermostat  6  inches  long  and  %  inch  in  diametor,  with  a  pilot  lamp  to  indicate  when 
the  current  is  on  or  off.  This  outfit  can  be  used  for  heating  and  regulation  in  any  water  bath 
whose  capacity  does  not  exceed  2  quarts  with  the  depth  of  the  water  not  less  than  2  inches.  It 
can  be  set  for  any  temperature  between  35°  and  60°  C.,  but  the  best  results  are  obtained  by 
having  it  set  at  the  factory  for  a  fixed  temperature  and  not  readjusting  it.  Shipping  weight, 
3  pounds.  Complete  with  6  feet  of  flexible  cord  and  an  attachment  plug  for  connection  to  any 
110  volt  lamp  socket.  Without  water  bath 25.00 

14332.  WATER  BATH,  Wassermann,  DeKhotinsky  Electrically  Heated  and  Regulated,  for  precision 

work  in  incubation,  inactivation,  the  study  of  thermal  death-points,  etc.  This  bath  is  a  special 
type  of  the  DeKhotinsky  Electrically  Heated  and  Begulated  Water  Baths  No.  14300,  of  a  shape 
and  design  adapted  especially  for  bacteriological  and  clinical  work.  It  will  accommodate  special 
supports  for  48  Wassermann  tubes,  and  trays  for  18  Vaccine  tubes.  It  is  of  the  same  construc- 
tion as  No.  14300,  and  is  provided  with  the  same  system  of  heating  and  regulation,  for  control 
of  temperature  to  1/10°  C.  In  order  to  secure  this  degree  of  precision,  Stirrer  No.  12864A 
must  be  included  in  the  equipment.  Diameter  of  the  bath,  10  inches;  available  height,  8  inches. 
Complete  with  four  standard  heating  units,  mercury  thermo-regulator,  sensitive  iron-clad  re- 
lay, constant  water  level  device,  three-point  switch,  three  support  rods  for  clamping  devices  in 
the  bath,  and  five  feet  of  cord  and  attachment  plug,  but  without  stirrer,  test  tube  supports,  or 
cooling  coil. 

No A  B  C  D 

A.  C.  D.  C. 

For  volts   110  220  110  220 

Each   75.00  77.50  72.50  75.00 

14333.  COOLING  COIL,  for  use  with  No.  14332  when  it  is  necessary  to  maintain  the  temperature  within 

2  degrees  of  room  temperature  or  lower 8.00 

HEATING  UNITS,  extra,  for  No.  14332,  115  watts  each. 

No 7526D  7527D 

For  volts  110  220 

Each   1.00  1.25  • 

12864A.  STIRRER,  High  Speed  Turbine,  for  use  with  No.  14332  in  order  to  hold  the  temperature  constant 
to  1/10  degree  C.  It  clamps  on  one  of  the  support  rods,  and  has  two  pulleys  at  the  top,  one  for 
belting  to  a  motor,  the  other  for  operating  a  stirring  rod  in  flasks  or  other  vessels  in  the  bath. 
Capacity,  5  liters  per  minute;  power  required  to  operate,  ^g  h-  P ^.00 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


519 


No.  13172. 


No.  13174. 


No.  14340. 


No.  14336. 


No.  14337. 


13172.  SUPPORT  for  use  with  Xo.  14332,  for  18  Vaccine  tubes   *5.00 

13174.  SUPPORT  for  use  with  Xo.  14332,  for  48  Wassermann  tubes 4.50 

14336.  WATER  BATH,  Wasserman,  Schultz,  Electrically  Heated  and  Regulated,  for  routine  work  not 

requiring  such  close  regulation  as  is  obtained  with  Xo.  14332.  The  bath  is  made  of  heavy  cop- 
per, tinned  on  the  inside,  and  covered  on  the  outside  with  thick  insulating  material.  The  heat- 
ing units  are  wound  on  lavito  cores,  and  are  placed  in  metal  tubes  at  the  bottom  of  the  bath, 
these  tubes  being  entirely  surrounded  by  water.  Provisions  are  made,  so  that  the  units  can  be 
easily  replaced  in  case  of  accidental  injury.  A  snap  switch  is  provided,  which  controls  one- 
half  of  the  heating  units,  the  others  being  permanently  connected  in  the  circuit.  The  bath  may 
be  used  at  a  temperature  of  56°  C.  as  an  inactivating  bath,  or  at  37.5°  C.  for  incubation  pur- 
poses. Begulation  of  the  temperature  is  effected  by  a  removable  Pencil  Type  Bimetallic 
Thermostat,  placed  in  a  metal  tube  at  the  bottom  of  the  bath  near  the  heating  units.  A  pilot 
lamp  is  furnished  for  indicating  when  the  current  is  on  or  off.  For  110  volts  A.  C.  or  D.  C. 
Complete  with  test  tube  racks,  thermometsr,  3x%  inch  test  tubes,  and  7  feet  of  connecting 
cord  and  attachment  plug. 

Xo A                     B 

Dimensions,  inches 9x4^x5  9x9x5 

Xumber  of  racks 1                        2 

Capacity,  tubes 48  96 

Current  consumption,  amperes '.....  1%                      2 

Each   42.50  55.00 

In  ordering,  kindly  specify  whether  the  thermostat  should  be  set  for  37.5°  or  56°  C. 

14337.  TEST  TUBE  RACK  only  of  Xo.  14336,  holding   48   3x%    inch   test    tubes.     Made   from   nickel- 

plated  brass  with  adjustable  supports  for  suspension  in  bath,  and  furnished  with  three  shelves 
as  shown  in  illustration.  Dimensions  of  rack:  8%x3%x2%  inches  high.  Height  O"er  all, 
8  inches.  Without  test  tubes 5.50 

14340.  WATER  BATH,  Whipple's,  for  melting  gelatine.  Of  heavy  copper,  tinned  inside,  with  rack  to 
hold  48  test  tubes  up  to  %  inch  in  diameter.  An  incandescent  lamp  may  be  used  to  heat  the 
bath  to  the  required  temperature.  Diameter  of  bath,  12  inches;  depth,  5  inches.  Without  lamp, 
lamp  socket  or  cord • 17.50 


520 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


No.  14366.  No.  14370.  No.  14359. 

14344.  WATER  BATH,  Wiley  Patented,  designed  to  generate  steam  quickly  with  small  gas  consump- 

tion. Of  heavy  copper  with  replaceable  water  cup  of  spun  copper  3%  inches  in  diameter,  with 
12  openings  S1/^  inches  and  2  openings  5%  inches  in  diameter,  with  concentric  copper  rings  and 
constant  water  level  regulator,  mounted  on  substantial  angle  iron  support.  Dimensions  of 
top,  25x141^  inches;  depth  on  outside  edge,  2  inches;  depth  in  center,  4  inches;  capacity  to 
water  inlet,  250  cc.  Can  be  operated  easily  by  one  ordinary  Bunsen  '  urner $50.00 

14345.  EXTRA  WATER  CUPS  for  No.  14344 each      1.15 

WATER  EXAMINATION  APPARATUS 

COLOR  TUBES,  see  Nos.  3014  to  3032. 
3010.  HEHNER'S  CYLINDERS  for  the  estimation  of  iron  in  water,  consisting  of  two  graduated  glass 

tubes  of  same  size  and  graduation,  with  stop-cocks per  pair       6.00 

HYDROTIMETERS  for  hardness  of  water,  see  No.  7800. 
NESSLER  JARS,  soe  Color  Comparison  Tubes. 

SEDGWICK-RAFTER  APPARATUS,  for  Microscopical  Examination  of  Water.     See  ' '  The  Microscopy 
of  Drinking  Water,"  by  Geo.  C.  Whipple. 

14352.  SEDGWICK-RAFTER  FUNNEL,  graduated,  with  attachment  and  rubber  stopper 3.25 

14353.  SEDGWICK-RAFTER  FUNNEL,  plain,  with  attachment  and  rubber  stopper 1.50 

14354.  BERKSHIRE  SAND per  pound         .15 

14355.  BOLTING  CLOTH  DISKS per  dozen         .25 

14356.  SUPPORT  for  funnel 1-75 

14357.  COUNTING  CELL 3  50 

14358.  COVER  SLIP 30 

14359.  EYEPIECE  MICROMETER 3.50 

14360.  PIPETTES,  a  set  of  two,  one  each  1  ce  and  5  cc per  set        .35 

14361.  GRADUATED  FLASK,  25  cc ' 50 

MICROSCOPE,  see  general  heading  Microscopes. 

WATER  HEATERS,  see  Heaters. 

14366.  WATER  SAMPLE  CASE,  consisting  of  a  well  made  wooden  case  with  hinges,  hasp  and  handle; 
with  separate  compartments  for  one  5  pint  and  one  4  ounce  glass  stoppered  bottle.  Excellent  for 
obtaining  samples  of  drinking  water  for  analysis  by  health  departments.  Complete  with  bottles 
and  container  for  small  bottle 5.00 

14370  WATER  TESTING  APPARATUS,  for  the  determination  of  ammonia  in  water,  as  used  by  the  De- 
partment of  Health  of  New  York  City,  consisting  of  a  metal  condenser  with  block  tin  condenser 
tube  and  support,  eight  Nessler  cylinders  graduated  at  50  and  100  cc  in  revolving  support, 
flask,  burner  and  support  for  same. .". 25.00 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A.  521 

14376.  WAX,  Bees',  Genuine,  unbleached,  in  cakes Per  Ib.    $1.00 

14377.  WAX,  Bees',  Imitation  (ceresin),  yellow Per  Ib.        .40 

14378  WAX,  Sealing,  express,  red,  four  sticks  to  the  pound Per  Ib.         .55 

14380.  WAX,  Universal,  for  use  in  t!ie  laboratory  wherever  a  plastic  yet  firmly  adhesive  cemeut  is 

needed.     In  4-ounce  jars Per  jar         .30 

14382.    WAX  TAPEES,  for  burning  in  oxygen,  etc.,  in  boxes  of  12 P-jr  box         .10 

14390.  WEATHER  FORECAST  CHART,"  or  Key  to  Barometer  Reading,  and  Chart  for  Aneroid  Bar- 
ometer, by  J.  Benj.  F.  Rawson,  late  of  the  Weather  Bureau.  This  chart  is  intended  as  an  aid 
in  the  intelligent  interpretation  of  barometer  readings  and  in  forecasting  weather  for  twenty- 
four  hours.  This  chart  will  be  found  quite  accurate  and  most  useful  in  any  science  labora- 
tory. With  full  directions -50 

14392.  "WEATHER  AND  WEATHER  INSTRUMENTS. "     This  book  describes  the  mechanism  of  the 

many  instruments  and  in  addition  gives  in  concrete  and  simplified  form  the  practical  uses  of 
the  different  instruments.  The  tables  of  classified  data  recommend  it  particularly  to  teachers. 
Pasteboard  covers -50 

14393.  "WEATHER  AND  WEATHER  INSTRUMENTS,"  same  as  above,  cloth  covers 1.10 

14396.      "PRACTICAL  HINTS  for  Amatsur  Weather  Forcasters."      Information  on  the  care  and  ex- 
posure of  barometers.     24  pages,  illustrated -10 

WEIGHING  BOTTLES,  see  Bottles. 

WIRE,  ALL  KINDS 

14410.   WIRE,  Aluminum,  bare. 

B.  &  8.  No 14          16         18        20         22         24         26         27         28         30 

Approx.  diameter,  inches..      .064       .051      .040      .032      .025      .020      .016      .014      .013      .010 

Per  4  oz.  spool 1.50      1.80     2.10     2.40     3.75 

Per  1  Ib  spool 2.45      2.70     2.85     3.30     3.90      5.10      

14412.    WIRE,  Brass  Spring,  on  4-ounce  spools. 

Washburn  &  Moen  No..     16      18      20      22        24        26        27        28        30        32        34        36 
Approx.  diam.,  inches..   .063  .047  .035    .028     .023     .018     .017     .016     .014     .013      .010      .009 
Approx.  feet  per  spool.     20      33      68      108      170      270      340      430      550      862     2270     3520 
Per  spool 40    .40    .40      .45      .55      .60      .66      .66      .70      .80     1.10     1.80 

14416.  WIRE,  Copper,  Annunciator  Wire,  double  cotton  covered  and  paraffined.  Orders  not  accepted 
for  less  than  1  Ib. 

B.  &  8.  No 16  18  20  22  24 

Approx.  feet  per  pound 106  157  230  350  550 

Per  pound 1.45  1.50  1.55  1.65  1.70 

14418.  WIRE,  Copper,  Lamp  Cord,  composed  of  fine  wires  insulated  with  rubber  and  braided  cotton; 
two  conductors  twisted. 

B.  &  S.  No 16  18  20  22 

Per   foot 10  .05  .05  .05 

WIRE,  Copper,  Magnet  Wire. 

B.  &  8.  No...     10      12      14      16      18      20      22      24      26      27      28     30      32      34      36      40 
Approx.  diam., 

inches    102  .081  .064  .051  .040  .032  .025  .020  .016  .014  .013  .010  .008  .006  .005  .003 

14422.  BARE  WIRE. 

Per  4  oz.  spooL 65     .65     .65     .65     .65     .70     .751.00 

Per  8  oz.  spool 95     .951.001.001.051.101.20   .... 

Per  1  Ib.  spooL  1.40  1.40  1.40  1.45  1.45  1.45  1.50  1.55  1.55  1.60  1.60  1.65  1.70  1.80  1.90   .... 

14423.  D.  C.  C.  WIRE. 

Per4oz.  spooL 75    .80  .90     .95  1.05  1.10  1.15  1.30  1.50  1.70  2,00  4.35 

Per  8  oz.  spool 1.20  1.25  1.45  1.65  1.80  1.90  1.95  2.30  2.65  3.05  3.65   .... 

Per  1  Ib.  spool.  1.60  1.65  1.70  1.80  1.90  2.15  2.45  2.70  3.00  3.25  3.40  3.90  4.60  5.50  6.70   .... 

14424.  D.  S.  C.  WIRE. 

Per4oz.  spooL 95  1.05  1.25  1.40  1.50  1.60  1.95  2.45  3.25  3.95  7.90 

Per  8  oz.  spool 1.40  1.60  1.80  2.15  2.45  2.70  2.90  3.60  4.55  6.25  7.55   .... 

Per  1  Ib.  spool 2.30  2.45  2.80  3.20  3.75  4.40  4.85  5.25  6.55  8.4511.8514.45  ... 

14428.  WIRE,  Copper,  Magnet  Wire,  Enameled.  The  enamel  insulation  is  an  elastic  yet  resistant  and 
firmly  adhering  film.  This  insulation  is  exceedingly  inert  toward  the  ordinary  agencies  met  in 
practice,  which  cause  silk  or  cotton  insulation  to  rapidly  deteriorate  and  lose  their  value  as  in- 
sulating mediums.  Impervious  to  moisture.  Requires  less  winding  space.  Positive  dielectric 
strength.  More  feet  to  the  pound. 

B.  &  S.  No 26  28  30  36  40 

Feet  per  oz 80  128  200  800  2000 

Per  4  oz.  spool .75  .75  .80  1.05  1.75 

Per  Ib.  spool 1.85  1.95  2.00  2.90  5.45 

14430.   WIRE,  Copper,  Rubber  Covered. 

B.  &  8.  No 12  14  16 

Per  foot 06  .05  .05 

14432.    WIRE,  Copper,  Soft,  bare,  on  4-ounce  spools. 

Washburn  &  Moen  No..     16      18      20      22        24        26        27        28        30        32        34        36 
Approx.  diam.,  inches..   .063.047.035    028     .023     .018     .017     .016     .014     .013      .010      .009 

Feet    per   spool 20      32      66      102      160      260      325      410      510      810     2050     3175 

Per  SDOol 40      40     .40     .45       .55       .60       .66       .66       .70       .80      1.10      1.80 

For  WIRE  TABLES,  see  pages  527-8. 


522  CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 

14434.  WIRE,  Copper,  Stage  Cable.  Consists  of  two  flexible  conductors,  insulated  according  to  Under- 
writers '  specifications,  the  whole  being  covered  with  a  black  cotton  braid,  thus  forming  a  sub- 
stantial single  cable.  Suitable  for  use  with  Arc  Projecting  Lanterns,  Motors,  etc. 

B.  &S.  No 10              12  14 

Capacity,  amperes 

Per  foot $0.25          .20  .15 

14438.    WIRE,  FUSE. 

Amperes    %             1              2             3              5              6             10            12            15  40 

Size  of  spools     4  oz.        8  oz.        8  oz.        8  oz.        1  Ib.        1  Ib.        1  Ib.         1  Ib.        1  Ib.  1  Ib. 

Feet  per  spool     400          500          340          220          168          145           82            66            53  17 

Per  spool 1.35        1.10        1.00        1.00        1.95        1.70        1.55        1.55        1.50  1.50 

WIEE,  German  Silver,  18%  alloy. 

B.  &  S.  No 16        18        20       22        24        26        27        28        30       32        34  36 

Approx.  diam.,  in...     .051     .040     .032    .025     .020     .016     .014     .013     .010    .008     .006  .005 

14440.  BARE  WIRE. 

Per  4  oz.  spool 85  .95  1.00  1.05  1.05  1.05  1.15  1.25  1.30  1.55 

Per  8  oz.  spool 1.40     1.45  1.55  1.70  1.70  1.80  1.80  1.95  2.15  2.35  2.75 

Per  1  Ib.  spool 2.35     2.35     2.50  2.70  2.85  2.95  3.00  3.10  3.25  3.65  4.05  4.85 

14441.  D.  C.  C.  WIRE. 

Per  4  oz.  spool 1.05  1.15  1.25  1.35  1.40  1.45  1.70  1.95  2.25     2.95 

Per  8  oz.  spool 1.60  1.80  2.00  2,20  2.40  2.55  2.65  3.05  3.60  4.25     5.60 

Per  1  Ib.  spool 2.70     2.85  3.15  3.55  3.90  4.25  4.55  4.75  5.45  6.50  7.8010.50 

14442.  D.  S.  C.  WIRE. 

Per  4  oz.  spool 1.80     2.00     2.20     2.30     2.80     3.50     4.60     5.60 

Per  8  oz.  spool 2.75     3.30     3.70     4.05     4.35     5.30     6.70     8.9510.95 

Per  1  Ib.  spool 4.30    5.15     6.00     6.90     7.55     8.15     9.9012.7017.2021.20 

WIRE,  Iron,  see  No.  14488  Steel  Wire. 

14450.  WIRE,  Iron,  Chemically  Pure,  for  standardizing,  containing  99.85  per  cent.  Fe.  In  glass  con- 
tainers. 

Size,  ounces    4 

Each  .30  .60  1.00 

14454.    WIRE,  Lead,  diameter  %  inch Per   foot         .05 

14464.    WIRE,  Nickel,  pure,  bare. 

B.  &  S.  No 16  24 

Per  oz 25  .30  .35 

14466.  WIRE,  Nickel-Copper  Alloy,  Ideal,  bare,  soft  annealed,  used  in  the  manufacture  of  electrical 
instruments  where  extreme  low  temperature  coefficient,  accuracy  and  permanency  are  desired. 
Resistance  is  29  times  that  of  copper  and  temperature  coefficient  for  1°  C.  =  +0.000005. 

B.  &  S.  No 18  20  22 

Per  Ib 4.05  4.35  4.65 

14468.  WIRE,  Nickel-Copper  Alloy,  Ideal,  same  alloy  as  No.  14466.  Nos.  18  and  20  are  double  cotton 
covered.  The  remaining  numbers  are  double  silk  covered. 

B.  &  S.  No 18  20  22          24  26  28  30  32  36          38 

Per  oz 80          .85          .90          .95         1.15          1.40          1.50        1.90        2.80        5.50 

Per  Ib 6.00        6.75        7.05       7.50        9.00        10.05        12.00        

14472.  WIRE,  Nickel-Steel-Chromium  Alloy,  Phenix,  bare,  used  extensively  in  the  manufacture  of  lan- 
tern rheostats,  etc.,  where  a  high  specific  resistance  combined  with  ability  to  withstand  oxida- 
tion and  corrosion  is  desired.  Resistance  is  50  times  that  of  copper;  temperature  coefficient 
for  1°  C.  =  +0.00054. 

B.  &  S.  No 12  16  20 

Per  Ib 3.45  3.60  3.75 

14476.    WIRE,  Piano,  on  spools. 

Music  gage  No 00  012345678 

Approx.  diameter,  inches..     .0087      .009      .010      .011      .012      .013      .014      .015      .018      .019 

Approx.  feet  on  spool 15          15         14         12         12         12         10         10          8  8 

Per  spool  

14478.    WIRE,  Piano,  steel,  in  *4  pound  rolls. 

Music  gage  No 1  2  4  5  6  7  8  9 

Approx.  diameter,  inches 010      .011      .013      .014      .015      .018      .019      .022 

Per    roll 4.35     2.70      1.80      1.50      1.35      1.15      1.05       .90 

Music  gage  No 10         12         14         18         23         26 

Approx.  diameter,  inches .025      .028      .032      .040      .049      .061 

Per    roll 70        .65        .60        .55        .50        .50 

14480.    WIRE,  Picture,  steel,  in  packages  of  25  yards.     No 0  1  2 

Per  package    — 15  .25  .30 

14484.    WIRE,  Platinoid,  bare;  temperature  coefficient  .000286. 

B.  &  S.  No 20  24  28  30 

Per  oz 60  .65  .75  .80 

WIRE,  Platinum,  see  general  heading  Platinum  Ware. 
14488.    WIRE,  Steel,  annealed,  soft,  on  4-ounce  spools. 
Washburn  &  Moen 

No 16        18        20       22        24        26        27        28        30        32         34         36 

Approx.  diam.,  in..     .063     .047     .035     .028     .023     .018     .017     .016     .014     .013      .010      .009 

Per  spool 13       .14       .15       16       .17       .18       .19       .20       .21       .22        .24        .30 

For  WIRE  TABLES  see  paees  527-8. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


523 


No.  14522. 


No.  14514. 


No.  14546.    No.  14548. 


14492. 
14494. 

14496. 
14504. 

14510. 

14512. 


14516. 
14520. 

14522. 
14526. 


14528. 
14534. 


14544. 


14546. 
14548. 


WIRE,  Tinsel,  not  insulated Per  yard    $0.15 

WIRE,  Tinsel,  Conducting  Cord.  Oiie  conductor.  Tinsel  wire  covered  with  green  braid.  Very- 
flexible  Per  yard  .10 

WIRE,  Tinsel,  Conducting  Cord.     Two  conductors,  each  covered  with  braid  of  distinctive  colors: 

the  -whole  covered  with  another  braid.     Very  flexible Per  yard         .30 

WIRE,  Zinc,  diameter  %  inch Per   foot         .15 

For  WIRE  TABLES  see  pages  527-8. 
WIRE  GAGES,  see  Gages. 

WIRE   GAUZE.   Brass.     Mesh 10  60 

Per  square  foot .70        .75        .80        .90 

WIRE  GAUZE,  Brass,  20  mesh,  in  squares  f  Jr  use  under  dishes,  beakers,  etc. 

No A  B 

Size,  inches 4x4  5x5 

Each 10  .U 

Per  dozen  LOO  1.40 

WIKE  GAUZE.  Copper,  for  combustions.     Mesh 

Per  square  foot 70         .80 

WIRE  GAUZE,  Iron,  20  mesh,  in  squares  for  use  tinder  dishes,  beakers,  etc. 

No A  B 

Size,  inches 4x4  '5x5 

Each 04  .05 

Per  dozen 40  .50 

WIRE  GAUZE,  Tinned  Iron,  with  flat  asbestos  center  3%  inches  in  diameter,  in  squares  for  use 

under  dishes,  beakers,  etc.     No A  B  C 

Size,  inches 4x4  5x5  6x6 

Each  -10  .12  .15 

Per  dozen  1-00  1.20  1.50 

WIKE  GAUZE,  Nichrome,  16  mesh,  will  last  almost  indefinitely  as  the  wire  is  practically  rust- 
proof, and  has  an  extremely  high  melting  point,  about  1500°  C.  (2800°F.). 

Size,  inches " 4x4  5x5  6x6  12x12 

Each 70  .90  1.30  4.00 

WIRE  GAUZE,  Nickel,  30  mesh per  square  foot    

WORK  BENCH.  This  bench  is  50  inches  long,  exclusive  of  tail  vise,  or  56  inches  over  all.  It 
is  32  inches  high  and  20  inches  wide,  with  a  13  inch  glued  up  maple  top  1%  inches  thick  and  a 
7  inch  well  for  tools.  It  has  holes  for  stops,  and  three  spring  wood  stops  are  supplied.  It  is 
fitted  with  both  front  and  tail  vises,  each  having  lV>-inch  patent  saw-cut  threaded  bench 
screws.  Bench  is  fitted  with  both  back  board  and  tool  rack,  as  shown  in  illustration.  Weight 

packed  for  shipment,  120  pounds.    F.  O.  B.  Factory  12.95 

WRENCHES,  Monkey,  good  quality. 

Length,  inches 8 

Each 80  .90 

WRENCH,  Monkey,  Pocket.    51A  inches  long 

WRENCH,  Stillson's  Pipe.     10  inches  long,  will  take  pipe  from  %  inch  to  1  inch 1.80 


80 

100 

200 

1.10 

1.60 

•  ••  • 

C 

F 

6x6 

12x12 

.20 

.70 

2.00 

7.00 

60 

80 

100 

.95 

1.10 

2.05 

C 

F 

6x6 

12x12 

.08 

.30 

.80 

3.00 

524 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


RAW  MATERIAL 

The  following  material  has  been  selected  with  special  reference  to  the  laboratory  shop.  The  prices 
are  based  on  ordinary  quantities  and  include  cost  of  cutting.  Special  prices  will  be  quoted  on  large 
orders.  All  prices  are  subject  to  market  fluctuations.  Castings  in  all  metals  supplied  at  market  prices. 

Tor  TABLES  giving  Comparative  Weights  of  Metals,  see  page  528. 


ALUMINUM 
14800.    ALUMINUM  ROD,  full  lengths  8  to  10  feet.     (See  note  below.) 

Diam.,  in • %  %6  %  %e          ¥2 

Lbs.  per  ft 057        .089        .128        .174        .227 

Per  ft.   .  $0.12       .15         .21         .30         .40 


%  %          %  1 

.356        .516        .697        .911 
.60          .85         1.05        1.35 


14802.    ALUMINUM  SHEET,  full  sheets  12  inches  wide,  5  to  6  feet  long.  (See  note  below.) 

Thickness,  B.  &  S.  No.     8          12          14         16          18         20  22         24         26  28 

Lbs.  per  sq.  ft  ......    1.8        1.13        .89        .71         .56        .45  .36        .28        .23  .18 

Per  sq.  ft  ...........  3.00      1.80      1.50      1.20       .90       .75  .60       .50       .45  .35 

14804.    ALUMINUM  TUBING,  seamless.     Prices  on  application. 
ALUMINUM  WIRE,  see  page  521. 

ASBESTOS 
ASBESTOS  MATERIAL,  see  Nos.  308  to  326. 


30 
.14 
.30 


14830. 

BRASS  ROD,  Round, 

BRASS 

full  lengths  12  feet.     (See  note  below.) 

Diam.,  inches.  . 

% 

%0 

14 

"He      % 

7<io 

% 

% 

% 

%           1 

1% 

Lbs.,  per  ft.  .  . 

045 

.100 

.18 

.28      .40 

.55 

.72 

1.13 

1.63 

2.21       2.89 

6.51 

Per  ft  

.06 

.09 

.15 

.21      .30 

.45 

.55 

.85 

1.20 

1.65       2.10 

4.75 

14832. 

BRASS  ROD,  Square, 

full 

lengths 

10  to 

12  feet. 

(See  note  below.) 

Size,  inches  

i/ 

% 

% 

% 

94 

Lbs.  per  ft  

.23 

.51 

.92 

1.44 

2.07 

Per  ft. 

.21 

.45 

.75 

1.15 

1.65 

14834.    BRASS  SHEET,  full  sheets  12  inches  wide,  about  6  feet  long.  (See  note  below.) 

Thickness,  B.&S.  No.      8          10         12        14         16         18         20         22        24  26  28  30 

Lbs.  per  sq.  ft  .....     5.69      4.51      3.57     2.83      2.25      1.78  1.41      1.12      .89  .70  .55  .44 

Per  sq.  ft  .........     4.95      3.90      3.10     2.50      1.95      1.60  1.25      1.05      .75  .70  .55  .45 


14836.  BRASS  STRIP,  full  lengths  10  to  12  feet. 
Size,  inches 
Lbs.  per  ft 
Per  ft. 


(See  note  below.) 


115 
12 


.23 
.21 


%x% 
.29 
.27 


.435 
.40 


%6xl 
.69 
.60 


%xl 
.92 
.85 


14838.    BRASS  TUBING,  brazed,  full  lengths  12  feet.     (See  note  below.) 
Diam.,  outside,*  in  ......      %     %6      ^4    %6     %      %      %      % 

Wall  ]    No.  14..  Per  ft  .................  40    .45    .55 

B.  &S.  ^  No.  18.  .Per  ft.     .......  20    .20     .20     .25     .30     .35 

Gage.  J    No.  20.  .Per  ft.     .15     .20     .20    .15 


% 
.60 
.40 


1  1*4  1V2  1%  2 
.75  .90  1.10  1.75  2.00 
.50  .60  .70  .85  .95 


BRASS  WIRE,  YIQ  inch  and  smaller,  see  page  521. 

CARBON 
14840.    CARBON,  Granulated,  for  experimental  purposes  ...............................  Per  Ib. 

14842.    CARBON  RODS,  plain,  12  inches  long. 

Diameter,  inches  ......................... 

Each 


16 


%6 
.16 


.18 


% 
.26 


V-i 
.28 


14844.    CARBON  SHEET,  12x12  inches. 
Thickness,  inches 
Per  sheet 
Special  sizes,  cut  to  order,  quoted  on  application. 

CARBONS,  for  batteries,  see  general  heading  Batteries. 


14 
3.50 


.25 


.30 


4.50 


NOTE:     For  convenience  in  shipping,  certain  items  —  rods,  tubing,  etc.  —  are  cut  in  about  3  foot 
lengths,  unless  specially   ordered  in   longer  pieces. 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  a  A.  525 


COPPEE 

14848. 

COPPEE  EOD,  full  lengths  10  to  12  feet.     (See  note  below.) 

Diani.,  inches   %       9ie        %        %        %         %          % 

1 

Lbs     per   ft                       047     .106.  .189     .426     .757      1.18       1.70 

3.0:? 

Per  ft                               $0.06     .15      .24      .45      .80      L25      L80 

235 

14850. 

COPPEE  SHEET,  plain,  full  sheets  12x60  inches.     (See  note  below.) 

Thickness,  B.  &  S.  No...         14            16            18            20            22           24          26          28 

30 

Lbs    per  sq.  ft  2.90         2.30         1.83         1.45         1.15         .91         .72         .57 

.46 

Per  sq  ft  2.85        2.25         1.80        L50        1.15        .95        .85        .65 

.60 

14852. 

COPPEE  SHEET,  Foil.    B.  &  S.  No.  36  Per  square  foot 

35 

14854. 

COPPEE  TUBING,  %6  inch  wall.     (See  note  below.) 

Diameter,  outside,  inches  % 

Vt 

Per  foot  30            35 

.45 

COPPEE  WIEE,  see  page  521. 

FERROTYPE 

14860. 

FEEEOTYPE,  plates  10x14  inches  Each 

.50 

FIBEE 

14862. 

FIBEE  EOD,  black,  full  lengths  about  30  inches. 

Diameter,  inches  V*         ^ie          %          %          %          % 

1 

Per  foot  30        .40        .40        .50        .75        LIO 

2.45 

14864. 

i'lBKK  SHEET,  black,  full  sheets  about  24x34  inches. 

Thickness,  inches    %          ^ie           %             *Ke           % 

v. 

Per  sq.  ft                                     95         1.35         1.80         2.45         3.25 

4.00 

14866. 

FIBEE  TUBING,  black,  thickness  of  wall  He  inch;  full  lengths  2  to  3  feet. 

Diameter,  inside,  inches  Vi            %            %            %            % 

1 

Per  foot  25          30          .35          .40          .45 

.55 

IEON 

14870. 

IEON  EOD,  Norwav,  soft,  for  electro-magnets.     (See  note  below.) 

Diameter,  inches  %            %            %            %           ?i 

1 

Lbs.    per    ft  16           .37           .67          1.04        1.51 

2.68 

Per  ft  15           .30           .55           .80         1.15 

2.05 

14872. 

IEON  SHEET,  Tinned.     Common  tin  plate,  size  20x28  inches. 

Xt,  1C              X             XX 

XXX 

Approx.  thickness,  B.  &  S.  Xo  28               26               25 

24 

Per  sheet  55            .60            .65 

.70 

14874. 

IEON   SHEET,   American  Eussia,   approximate  thickness,  0.016  inch  Per  sq.  ft 

35 

IEON  WIEE,  see  Steel  Wire,  page  522. 

LEAD 

14880. 

LEAD  SHEET. 

Thickness,  inches  %4         %2         Vie           %            $ie 

V4 

Lbs.  per  sq.  f  t  1            2             4             8             12 

16 

Per  sq.  ft  50         .60         130        2.55         3.85 

5.10 

LEAD  SHOT,  see  No.  8216. 

14882. 

LEAD  TUBING,  medium  wall. 

Diameter,  inside,  inches  V4              %              %              % 

% 

Lbs.  per  ft  375            1.0            1.25            2.0 

2.25 

Per  ft   12             30             .45             .60 

.65 

LEAD  WIEE,  see  page  522. 

MICA 

14888. 

MICA  SHEET. 

Size,  inches  2x4%             4x5             4x6 

5x7 

Per  sheet  .10               .20             .25 

.60 

PHOSPHOE  BEONZE 

PHOSPHOE  BEONZE  EIBBON,  for  galvanometer  suspensions,  see  page  207. 
14894.    PHOSPEOE  BEONZE  SHEET,  full  sheets  6  inches  wide  and  4  to  6  feet  long.     (See  note  below.) 

Thickness,  B.  &  S.  No 22  24  26  30 

Per  sq.  ft 2.10  L75  1.45  1.00 

PLATINUM 
PLATINUM  SHEET  AND  WIEE,  see  general  heading  Platinum  Ware. 

NOTE:     For  convenience  in  shipping,  certain  items — rods,  tubing,  etc. — are  cut  in  about  3-foot 
lengths,  unless  specially  ordered  in  longer  pieces. 


526 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


RUBBER 

14900.    RUBBER  ROD,  hard,  polished,  full  lengths  30  inches. 

Diam.,  inches  ....     %6           ^4          tyio          %  %6  % 

Lbs.,  per  ft 015        .027         .04        .063  .08  .10 

Per  ft. $0.10       .12         .15        .25  .30  .40 

14902.    RUBBER  SHEET,  hard,  polished,  full  sheets  20x48  inches. 

Thickness,  inches i^g  %  %g 

Lbs.  per  sq.  ft 38          .76  1.14 

Per  sq.  ft 1.15        2.40  3.25 

RUBBER  SHEET,  soft,  see  page  429. 
14904.    RUBBER  TUBING,  hard,  not  polished,  V»  inch  wall. 

Diameter,  outside,  inches % 

Per  ft .20 

RUBBER  TUBING,  soft,  see  general  heading  Rubber  Tubing. 


.16 
.55 


1.52 

4.95 


74 

.23 
.75 

%8 
1.90 
6.00 


.30 


% 
.29 
.90 


2.28 
6.60 


.40 


1 

.42 
1.35 


3.04 
9.60 


.50 


STEEL 
STEEL  WIRE,  see  page  522. 

STEEL  RIBBON,  for  galvanometer  suspensions,  see  page  207. 

14906.  STEEL  ROD,  Cold  Rolled,  Rectangular,  full  lengths  10  to  12  feet.     (See  note  below.) 

Size,  inches i/16x V2  %x*£       '    %xl  V>x% 

Lbs.  per  ft 106  .212  .85  1.28  2.55 

Per  ft 10  .15  .35  .40  .75 

14907.  STEEL  ROD,  Cold  Rolled,  Round,  full  lengths  10  to  12  feet.     (See  note  below.) 

Diameter,  inches  14         %e          %%%%%! 

Lbs.  per  ft 17         .27         .39         .67         1.1         1.5         2.1         2.7 

Per  ft 10          .10         .12         .15         .25         .30         .40         .55 

14908.  STEEL  ROD,  Cold  Rolled,  Square,  full  lengths  10  to  12  feet.     (See  note  below.) 

Size,  inches 14  %  i/,  %  i 

Lbs.  per  ft 213  .478  .851  1.94  3.4 

Per  ft 12  .15  .25  .55  .85 

14910.    STEEL  ROD,  Coppered  Bessemer,  round,  full  lengths  4  feet.     (See  note  below.) 

Diameter,  inches %           %6            14           tyio            %  %g  % 

Lbs.  per  ft 05           .10           .17           .27           .39  .52  .67 

Per  ft 05           .05          .05          .10          .10  .15  .20 

14312.    STEEL  ROD,  Drill  Rod,  round,  for  tool  making. 

Diam.,   inches.  .       %     ytfi      %     ylrt      %    7^6      i/2     6/lQ      %     i^e     04       i%6      %     i^e      j 
Per  foot 15     .20     .25     .30     .40    .50     .65     .75     .90    1.00    1.25    1.50    1.75    1.85   2.00 

14914.  STEEL  ROD,  Magnet,  Round. 

Diameter,   inches *4  %  %  %  % 

Per  foot 15  .35  .60  .95  1.35 

14915.  STEEL  ROD,  Magnet,  Square. 

Size,  inches %  %  %  %  % 

Per  foot 20  .45  .80          1.20          1.70 

Hardening  and  magnetizing  quoted  upon  application. 

TIN 
TIN  SHEET,  see  Iron  Sheet,  tinned. 

14930.    TIN  SHEET,  pure  block  tin,  B.  &  S.  No.  22, 12  inches  wide Per  sq.  ft.  3.10 

14932.    TIN  TUBING.     Pure  block  tin. 

Diameter,  inside,  inches %0  %  %e  %  %  % 

Ounces  per  foot 456  8  8  12 

Per  ft 75          .90          1.05          1.45          1.45  2.10 

ZINC 

14940.   ZINC  SHEET,  thin,  B.  &  S.  No.  32 Per  sq.  ft  .20 

14942.    ZINC  SHEET. 

Thickness,  inches }£2           We            %           %6            ^4  %e 

Lbs.  per  sq.  ft 1.15         2.30         4.60         6.90         9.20  11.50 

Per  sq.  ft 75          1.35       .2.80        4,00         5.35  6.65 

ZINC  WIRE,  see  page  523. 

NOTE:     For  convenience  in  shipping,  certain  items — rods,  tubing,  etc. — are  cut  in  about  3-foot 
lengths,  unless  specially  ordered  in  longer  pieces. 


CENTRAL  SCIENTIFIC  CO..  CHICAGO,  U.  8.  A. 


527 


APPROXIMATE   FEET  PER  POUND   OF  WIRE. 
Also  Approximate  Resistance  of  Copper  and  German  Silver  Wire. 
For  sizes  larger  than  No.  14,  see  table  of  weight  of  rods  on  page  528. 


B.  &8. 

No. 

Aluminum 
Wire. 

Brass 
or 
G.  S.  Wire. 

Copper  Wire. 

Iron  or 
Steel 

Ohms  per  foot. 

Bare. 

D.  C.  C.  j  D.  8.  C. 

Wire. 

Copper.  |  18%  G.  S. 

14    |     268 

85 

80 

88 

.00252 

.0460 

15 

334 

107 

102 

108 

.00318 

.n.-M. 

16 

-   417 

132 

128 

l::!' 

.00401 

.0732 

17 

526 

171 

162 

i;- 

.00506 

.0923 

18  ~ 

667 

215 

204 

226 

.00637 

.1164 

19 

847 

272 

264 

279 

.00804     .1467 

20 

1  ."•;:: 

343 

324 

298 

312 

353 

.01014  j    .1850 

21 

1,346 

431 

408 

370 

389 

446 

.01278 

.2333 

22 

1,695 

549 

515 

461 

493 

565 

.01612  |    .2941 

23       2,123       684 

650 

584 

631 

714 

.02032 

.3710 

24 

2^580 

869 

819 

745 

779 

909 

.02563 

.4678 

25 

3,389 

1,086 

1,033 

903       966 

1,124 

.03231  |    .5899 

26 

4,291 

1,388 

1,302 

1,118 

1,202 

1,428 

.04075 

.7438 

27       5,405 

1,754 

1,642 

1,422 

1,542 

2,000 

.05138 

.9386 

28       6,849      2,222 

2,071 

1,759      1,917 

2,273 

.06479 

1.183 

29       8,620      2,777 

2,611 

L',J"7      2,485 

2,857 

.08170 

1.491 

30      10,869      3,448 

3,294 

2,534      2,909      3,623 

.1030 

1.879 

31       

4.  ..47 

4,152 

.'..'••*      3,683      4,566 

.1299     2.371 

32       

5,555 

5,236 

3,737      4,654 

5,649     .1638 

2.990 

33 

7,142 

6,602 

4,697      5,689 

7,194     .2066 

3.771 

34 

9,090 

8,328 

6,168      7,111   |   9,090     .2605 

4.756 

35       

11,111 

10,501 

6,737      8,534 

11,493     .3284 

5.997 

36 

14,084 

13,258 

7,877     10,039   |   14,493     .4142 

7.560 

37 
38 

QQ 

1   

16,691 
20,854 

1    OR  3  no 

9,309     10,666   |   
10,666     14,222      
11  907     16  516 

.5222 
.6585 

«.  '.114 

9.532 
12.02 
15~16 

40 

—  ;  

|   33,176 

14,222     21,333 

1.047 

19.11 

WIRE  GAGE  TABLE. 
Showing  sizes  in  decimal  parts  of  an  inch. 


Wire 
Gage 
Number. 

American 
or 
Brown  & 
Sharpe. 

Washburn 
& 
Moen 
Mfg.  Co. 

Music 
Wire. 

Wire 
Gage 

Number. 

American 
or 
Brown  & 
Sharpe. 

Washburn 
& 
Moen 
Mfg.  Co. 

Music 
Wire. 

00 

.365 

.331 

.0087 

18 

.0403 

.047 

.040 

0 

.325 

.307 

.0093 

19 

.0359 

.041 

.042 

1 

,289 

.283 

.0098 

;          20 

.0320 

.035 

.043 

2 

.258 

.263 

.0105 

21 

.0285 

.032 

.045 

3 

.229 

.244 

.0115 

22 

.0253 

.028 

.047 

4 

.204 

.225 

.0125 

j          23 

.0226 

.025 

.049 

5 

.182 

.207 

.0145 

24 

.0201 

.023 

.053 

6 

.162 

.192 

.0150 

25 

.0179 

.020 

.056 

7 

.144 

.177 

.0175 

26 

.0159 

.018 

.061 

8 

.128 

.162 

.0190 

27 

.0142 

.017 

.064 

9 

.114 

.148 

.0220 

|          28 

.0126 

.016 

.069 

10 

.102 

.135 

.024o 

29 

.0113 

.01.1 

.072 

11 

.091 

.120 

.0270 

i          30 

.0100 

."14 

.076 

12 

.081 

.105 

.0285 

!          31 

.0089 

.0135 

.081 

13 

.072 

.092 

.0305 

!          32 

.0080 

.013 

.086 

14 

.064 

.080 

.0320 

34 

.01..;:: 

.010 

.101 

15 

.057 

.072 

.0350 

:          36 

;o<j§jj 

.009 

.118 

16 

.051 

.063 

.0360 

!          38 

.0040 

.008 

.130 

17 

.045 

.054 

.0380 

i          40 

.0031 

.007 

.175 

Fractional  Equivalents  in  Decimals. 


Fractional  parts  of 

an  inch  

1   % 

•,, 

% 

^B   ! 

% 

I     *9     1 

%    1 

Vn   \ 

%2 

%4 

Decimal  parts  of  an 

inch  

1    -5 

|  .438 

.375 

.313   | 

.25 

|  .188  | 

.125   I 

.063  ( 

.031 

.016 

528 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


APPROXIMATE  WEIGHT  IN  POUNDS  OF  RODS  ONE  FOOT  LONG. 


Diameter.                       Aluminum. 

Brass. 

Copper 

Iron  or  Steel. 

Me                                 -0034 

.011 

i                 .012 

.010 

%                                  .0144. 

.045 

I                 .048 

.041 

•y16                        .032 

.100 

i                 .106 

.092 

%                 |                 .057 

.175 

1                 .190 

.166 

"He                1                -089 

.275 

i                 .296 

.260 

%                 I                .128 

.395 

|                 .426 

.372 

''An               i                -174 

.540 

1                  .579 

.508 

y2          i          .227 

.710 

|                 .757 

.664  ' 

8/16                                 -288 

.900 

1                 .958 

.842 

%                                  .356 

1.100 

1               1.182 

1.034 

%                  I                  .511 

1.66 

|               1.703 

1.501 

%                                  .696 

2.15 

2.318 

2.014 

1                                   .910 

|               2.85 

|               3.03 

2.660 

APPROXIMATE   WEIGHT   IN   POUNDS   OF   ALUMINUM,  BRASS,  COPPER,  IRON,  STEEL  AND 

ZINC   PER   SQUARE   FOOT. 


B.  &  S. 

No. 

Size, 
Inches. 

Nearest 
fraction. 

Aluminum. 

Brass. 

Copper. 

Iron 
or  Steel. 

Zinc. 

1 

.2893 

4.029 

12.382 

13.105 

10.993 

10.746 

2 

.2576 

V4 

;i.r>ss 

11.027 

11.671 

9.790 

9.337 

3 

.1^94 

%2 

:;.i<»r. 

9.819 

10.393 

8.718 

8.522 

4 

.2043 

2.845 

8.744 

9.255 

7.76.T" 

7.589 

5 

.1819 

yie 

2.534 

7.787 

8.242 

6.914 

6.658 

6 

.1620 

%2 

2.256 

6.934 

7.339 

6.157 

6.018 

7 

.1443 

2.009 

6.175 

6.536 

5.482 

5.354 

8 

.1285 

% 

1.789 

5.499 

5.821 

4.88L' 

4.773 

9 

.1144 

1  ..V.M 

4.898 

5.184 

4.348 

4.251 

10 

.1019 

1.418 

4.361 

4.615 

3.871 

3.756 

11 

.0907 

%2 

1.264 

3.884 

4.110 

3.448 

3.37 

12 

.0808 

1.126 

3.458 

3.661 

3.071 

3.00 

13 

.0719 

1.002 

3.080 

3.260 

2.734 

2.62 

14 

.0641 

Me 

.892 

2.743 

2.903 

2.435 

2.32 

15 

.0571 

.795 

2.442 

2.585 

2.168 

2.06 

Hi 

.0508 

.708 

2.175 

2.302 

1.931 

1.87 

17 

.0452 

%4 

.630 

1.937 

2.050 

1.720 

1.68 

18 

.0403 

.561 

1.725 

1.826 

1.531 

1.50 

19 

.0359 

.500 

1.536 

1.626 

1.364 

1.35 

20 

.0319 

%2 

.435 

1.368 

1.448 

1.214 

1.20 

21 

.0284 

.396 

1.218 

1.289 

1.081 

1.05 

22 

.0253 

.353 

1.085 

1.148 

.963 

.95 

23 

.0226 

.314 

.966 

1.022 

.858 

.85 

24 

.0201 

.280 

.860 

.910 

.764 

.75 

25 

.0179 

.249 

.766 

.811 

.716 

.67 

26 

.0159 

VM 

.222 

.682 

.722 

.636 

.60 

27 

.0142 

.197 

.607 

.643 

.568 

.52 

28 

.0126 

.176 

.541 

.573 

.504 

.45 

29 

.0112 

.157 

.482 

.510 

.452 

.40 

30 

.0100 

.140 

.429 

.454 

.400 

.37 

Aluminum  (99%  pure) 1.61 

Copper 1.00 

German  Silver  (18%  Nickel) 18.00 

Gold  (99.9%  pure) 1.38 


COMPARATIVE   RESISTANCES   OF   METALS. 
(Copper  as  the  Unit.) 

Nickel  7.78 

riatinum  (annealed)   5.65 

Platinoid    20.00 

Silver  (annealed) 92 


Iron  . 
Lead 


5.70 
12.80 


Tin   . 
Zine 


8.28 
3.62 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


529 


A  Page 

Abbe    Camera    Lucida 343-344 

Abbe  Condensers    343 

Abderhalden  Reagents   82 

Abel-Pensky       Flash       Point 

Testers    376 

Abney's        Reflecting        Level 

(Clinometer)   482 

Absorbent   Cotton   Disks 363 

Absorption    Apparatus,    Chlo- 
rine        145 

Absorption   Apparatus,    Heat.    445 
Absorption    Apparatus,    Mois- 
ture        445 

Absorption  Bulks,  all  kinds.  . 

8,   9,    371.   413,   414 

Absorption   Paper   for   Fat   in 

Milk     361 

Absorption   Paper  for  Botan- 
ical  Mounting    95 

Absorption    Pipettes    293-294 

Absorption    Tubes    8, 9 

Acetylene  Burner   118 

Acetylization  Flask 246 

Achromatic  Objectives    348 

Acid  Basins 186 

Acid  Bottles   98 

Acid   Bottle   for  Milk   Testing  856 

Acid    Bottle    Trunnion 366 

Acid   Burettes    356 

Acid   Carboy   Stands 129 

Acid   Dippers    356 

Acid  Dishes 185 

Acid     Feeder     for     Flotation 

Machine    251 

Acid  Funnel    257 

Acid    Gloves,    Rubber 298 

Acid   Hydrometers    311-312 

Acid  Jars   329 

Acid  Measures   356 

Acid   Pipettes   for   Milk 356 

Acid    Pitchers    9 

Acid   Proof  Cement 130 

Acid  Proof  Finish 9 

Acid   Pumps    9 

Acid   Siphons    443 

Acid  Testers 356 

Acidimeters     311-312 

Acidity  Testers  for  Soil 456 

Acme   Automatic   Water   Still   195 

Acme  Bunsen  Burners 118 

Acme  Safety  Burners 118 

Actlnometer    312 

Adam's   Fat    Extracted   Paper  361 

Adapters  for  Retorts 9 

Adhesion   Machine    18 

Adhesive  Tape    95,   486 

Adhesivemeter.    Brown's    ....      18 
Adiabatlc  Calorimeter,   Parr's  128 

Adjustable  Burners   118 

Adjustable    Clamps    149 

Adiustable  Bench  Level 333 

Adjustable    Table    479.480 

Aeroscopes    10 

Agar  Filter  Paper 238 

Agar  Melting  Water  Baths..    514 

Agateware  Boilers 329 

Agateware    Casseroles    130 

Agateware    Funnels    267 

Agateware   Kettles    329 

Agateware   Measures    336 

Agateware   Scoops    435 

Agricultural   Mills    177-181 

Air  Analysis   Apparatus.  .  .10,   279 

Air  Baths 21.    23.    383-388 

Air   Baths.    Flask 250 

Air   Compressors    88-92 

Air  Melting  Point  Oven 23 

Air  Meters    12.  289 

Air   Pumps 89-91,    414-416 

Air    Pumps,    Filtering.  ..  .242.   243 

Air   Pumps.   Mechanical 89-91 

Air   Pump   Plates 416 

Air  Pump  Receivers 79.   80 

Air  Pump  Stop-Cocks 471 

Air  Sampler    10 

Air  Tester,  Wolpert's 10 

Air  Testing  Apparatus.  10,  82,  279 

Air   Thermometer   Tubes 10 

Alarm   Thermometers    493 

Albumlnometers    508 

Albumoscope     508 

Alcohol    Blast    Burners. .  .120,  121 

Alcohol  Blowpipe   121 

Alcohol    Burners    120,   121 

Alcohol  Determination   Appa- 
ratus     199.  204 


INJDEX 

Page 

Alcohol   Hydrometer  ' 312 

Alcohol  Lamps    120 

Alcohol   Lamp   Wlcklng 120 

Alcohol  Lamp  Tripod 506 

Alcohol   Stoves    120.   121 

Alcoholometers    312 

Alembirs    427.428 

Aliphatic  Amlno  Group  Appa- 
ratus,  Van   Slyke 372 

Alkali   Hvdrometer    312 

Alkali      Reserve     Determina- 
tion  Apparatus  for  Blood.. 

Alkalimeters     129 

Alkaline      Tablets,      Farrlng- 

ton's     3K7 

Alkalinltv   Flask.   Volumetric  2KO 

Alllhn's    Condenser    165 

Alllhn's   Gas   Washing   Bottle  294 

Alsop's    Drying   Oven 514 

Alternating    Current    Motors. 

214-?15 

Alternating   Meters    210-211 

Altimeter.    Pocket    4*2 

Altitude  Gage 63-65.   27? 

Alumina  for  Pollshlner 338 

Aluminum   Balance   Scoops. 61,  s? 

Aluminum   Beakers    

Aluminum    Boxes    107.  187 

Aluminum  Desiccator  Plates.    1*S 

Aluminum    Dishes    187 

Aluminum    Foil     2KR 

Aluminum  Funnel  Supports..    479 

Aluminum    Gas   Tips 294 

Aluminum    Holders    for    Cen- 
trifuge Tube*    135.   13* 

Aluminum  Leaf 2K6 

Aluminum  Milk  Dishes.  ..187,  35* 
Aluminum  Moisture  Dishes.  .  1*7 

Aluminum    T?od    624 

Aluminum  Screw  Cap  Bottl»s 

105.   357 

Aluminum  Sheet   B24 

Aluminum    Rnoons    468 

Aluminum   Student  Balance.  .      40 

Aluminum   Tubing    524 

Aluminum       Weighing      Dish 

with   Counterpoise    61 

Aluminum   Weighing  Scoop..      61 

Aluminum   Wire    S21 

Alundum   Cement    130 

Alundum  Combustion  Boots..  161 
AluTidum  Combustion  Boat 

Lining     162 

Al'mdum      Combustion      Boat 

Shields    162 

Alundum      Combustion      Cap- 
sules      162 

Alundum    Conical    Filters....    237 

Alundum   Crucibles    170 

Alundum    Dish    for    Incinera- 
tions        162 

Alundum     Extraction     Thim- 
bles       232 

Alundum   Filter  Cones 237 

Alundum   Filter   Dishes 238 

Alundum    Filtering   Crucibles  170 

Alundum   Muffles    867 

Alundum  Melting  Crucibles..  170 
AlunrtiiTTi  "Pvromet^r  Tubes..  ?fi1 
Alundum  Refractory  Cement.  TO 

Alundum.    R    R 162 

Alundum  Tubes 261 

Alveolar    Air  T»stiner  Outfit..      *2 

Amber    Gloss    Bottles 98 

Anibers-'s  Swimming  dins...  484 
American  Society  for  Testing 

Materials  Sieves    442 

Ames   Moisture   Tester 361 

Ammeters  and  Mllliameters.  . 

209,    210,    212.    213 

Ammonia,  Nitrogen  and  Urea 
In  TJrlne,  Folln's  Apparatus 

for    508 

Ammonia     Absorption     Appa- 
ratus          11 

Ammonia   Determination    Ap- 
paratus         11 

Ammonia    Distillation    Appa- 
ratus,   Kjeldahl's    369-371 

Ammonia   Gas    274 

Ammonia   Hydrometers    SI  2 

Ammonia  Still    520 

Ammonia    Synthetic    Appara- 
tus        332 

Ammonia    Test    Cylinders....   153 


Page 
Ammonia     Trap     for     Folln's 

Apparatus    508 

Ampoules    11 

Ampoules,     PhenoI-Sulphone- 

Phthaleln    156 

Anaerobic  Culture   Apparatus 

Analytical  Balances 30-36 

Analytical  Filter  Paper.  .  .239-241 

Analytical  Weights   55-67 

Anatomical  Jars   327 

Anemometers    

Aneroid   Barometers    63-64 

Animal  Bladders    81.   401 

Animal  Board    

Animal  Cages   12.   1 

Animal    Holders    

Animal  Jars    

Annealing  Cups 13 

Annunciator  Wire    521 

Anodes.    Platinum    410 

Anode  Rotator 229 

Antimony  Rubber  Tubing.  . . .    43C 
Antitoxin   Culture  Flasks....    182 

Anvils    13 

Anvils   with   Vises 511 

Aplanatic  Triplets    336 

Apothecary  Weights   59 

Application  Goniometer.  Pen- 
field's    298.   299 

Apparatus.  Arsenic 16.  1 

Apparatus,  Asphalt  Testing.  18-25 

Apparatus.   Blast    88-92 

Apparatus,    Blowplplng    .  .  .  .92-94 
Apparatus  for  Carbon  Deter- 
mination     

8,  9.  153.  154.  159.   160-163 

Apparatus.  Carbonic  Acid....    129 
Apparatus,       Cement       Test- 
ing    131-133 

Apparatus       for       Collecting 

Bacteria  10 

Apparatus.  Combustion  ..160-163 
Apparatus  for  Counting  Ba^- 

terla   168.   169 

Apparatus.  Creosote  Testlng.18-25 
Apparatus,  Decomposition... 

332.   333 

Apparatus,   Digestion    ....369-371 

Apparatus,   Distilling    

20-21.    195-200 

Apparatus,  Drying 204 

Apparatus,    Dust    Determina- 
tion     10.   285 

Apparatus,    Electro-Chemical. 

. 229,    396-399.   403 

Apparatus.  Extraction  

19.   22.    230-233 

Apparatus,   Filter 235-238.  2 

Apparatus,   Flour  Testing. 252-25 

Apparatus.  Freezing    400 

Apparatus.    Fusel    Oil    Deter- 
mination         2 

Apparatus,  Gas  Analysis.  .276-294 
Apparatus.      Hardness      Test- 
ing      303-30S 

Apparatus,    Hoffman's    ...332.   333 

Apparatus.   Kjeldahl    369-371 

Apparatus,  Lecture   332.   333 

Apparatus,  Melting  Point.  .  .  . 

18,   23.   336 

Apparatus.  Methane  Determi- 
nation     276.  294 

Apparatus.  Milk  Testing.  .356-364 
Apparatus,  Mine  Air  Testing 

276.   277 

Apparatus.  Molecular  Weight 

Determination     400,   401 

Apparatus,  Nitrogen  Determi- 
nation      369-371 

Apparatus,  Oil  Testing. .  . 373-SSfl 
Apparatus,  Pitch  Testing. .  .18-25 
Apparatus,  Radioactivity. .  423-426 
Apparatus  for  Recalescence 

Point 263,    417-423 

Apparatus.  Shaking 438-440 

Apparatus,    Soil    Analysis. 445-460 

Apparatus,  Stirring   470 

Apparatus,    Sulphur    475.   476 

Apparatus,  Tar  Testing 18-25 

Apparatus,  Urinary    508-510 

Apparatus.  Vacuum  Distilling  426 
Apparatus,  Vapor  Density... 

610-511 

Apparatus,  Water  Analysis..  520 
Apparatus,  Water  Sampling.  520 
Apparatus  Supports  477-481 


530 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Page 

Aprons    1. 

Aprons,   Asbestos    1. 

Aquaria     IB,  1 

Aquarium  Jars    1_ 

Arc  Lamp  for  Microscopes...    341 

Areometers    311-311 

Argand  Burners 114,   111 

Armored  Thermometers   492 

Arnold  Steam  Sterilizers 469 

Arrhenlus   Conductivity   Cells  396 

Arrows,   Surveyors'    48' 

Arsenic  Apparatus    16    1' 

Arsenic  Plates l( 

Arsenic  Tubes   r 

Artery  Forceps 18! 

Artery  Scissors    192 

Asbestos  Aprons 1< 

Asbestos  Board  r< 

Asbestos  Cement i', 

Asbestos  Center  Gauzes 52! 

Asbestos   Cloth    17 

Asbestos  Cord    \'t 

Asbestos  Drying  Oven 388 

Asbestos  Gloves    291 

Asbestos  Mats    11 

Asbestos  Pads   

Asbestos  Paper  

Asbestos  Slate   11 

Asbestos  Twine 17 

Asbestos  Wire  Gauze 523 

Asbestos  Wood    17 

Ashing  Dishes 129,   187,  188 

Asphalt  Crucible    20.  173 

Asphalt  and  Tar  Testing  Ap- 
paratus     18-25 

Asphalt  Hydrometers    23 

Asphalt  Thermometers.18,   20,   492 

Aspirating   Syringe    485 

Aspirators 242.    243.   445 

Aspirator  Bottles 98,   99.   446 

Assay   Balances    37    38 

Assay  Button  Brush 108 

Assay   Button    Weights 67 

Assay   Crucibles 170,    171,   173 

Assay  Cupels    182 

Assay   Flasks    246,  248 

Assay  Furnaces    264-269 

Assay  Furnaces  for  Gas 

264.    265,    268.   269 

Assay  Furnaces  for  Gasoline 

.   264.   268.   269 

Assay    Mills    175-181 

Assay  Pocket  Scales 38 

Assay   Roasting   Dishes 188 

Assay   Supplies    182 

Assay   Ton    Weights 67 

Assayer's   Mills    175.  181 

Atom   Models    366 

Atomic  Weight  Charts 144 

Atomizer  Bulbs    88    428 

Attaching  Plug  for  Electrical 

Connections    227.   228 

Attachments   for   Burettes..  .    113 

Attachments   for   Burners 123 

Attachment,    Test    Tube    Fill- 
in*    488 

Atwater  Dessicator    184 

Augers,    Soil    452.   463 

Auger,   Soil   Tube 460 

Auger  Bits    25 

Autoclaves     26-29 

Autoclaves   for.  Chemical    Di- 
gestions   (Digesters)    27,   28 

Autoclaves.     Steam     Pressure 

Sterilizers    26-29 

"Autogenor"  Gas  Generator..    288 
Automatic     Air      Compressor 

and   Exhaust  Pump 90 

Automatic  Alarm  Thermome- 

.  ters    493 

Automatic  Burettes   112 

Automatic   Burners.   Barthel's   120 

Automatic   Depth    Gage 304 

Automatic  Laboratory  Micro- 
tome        352 

Automatic  Oil  Measuring  De- 
vice        302 

Automatic   Pipettes.  .  .87.    356.   404 
Automatic     Precision     Micro- 
tome        358 

Automatic   Stills    195-198 

Auxanometer    407 

Avoirdupois  Weights    58,  69 

Ayrton-Mather   Galvanometer 

.  Shunt    206 

Azotometers 371,  372 


Hancock   Bottles    357,  35? 

Babcock  Bottle  Rack 362 


Page 

Babcock   Milk    Testers 359-361 

Babo's   Absorption   Tube 

Bacilli    Mills    179 

Bacteria    Collecting    Appara- 
tus          10 

Bacteria     Counting     Appara- 
tus      168,   169 

Bacteria  Filters   236,   237 

Bacteria   Grinding   Apparatus  179 
Bacteriolog  leal    Culture 

Flasks     182 

Bacteriolog  ical    Culture 

Jars  11 

Bacteriological    Fermentation 

Tubes 234.  235 

Bacteriological     Filter     Apa- 

ratus    235-238 

Bacteriological   Incubators... 

o-i  o _i>9 r 

Bacteriological   Syringes.  . 484-48f 
Bacteriologists'    Soil    Sampler  454 

Bagasse  Cutter    179 

Bags,   Filter    237 

Bags,   Gas    282 

Bags,  Ice    317 

Bags,   Paper    391 

Bags,   Rubber    279,   282 

Bailey   Crucible   Holder 174 

Bailey  -   Walker      Extraction 

Apparatus    230 

Bakers'    Scale    54.   252 

Baking  Cylinders    252 

Baking    Ovens,    Electric.  .381,   382 
Baking   Oven   Thermometers. 

255,   493 

Baking   Pans    253 

Balance,  Aluminum,   Student.      40 

Balances,   Analytical    30-36 

Balances,  Assay   37,   38 

Balances,  Automatic    46 

Balances.    Cement    46 

Balances,   Cenco   Analytical..      36 
Balance,  Centrifuge  Tube....    143 

Balances,   Chainomatlc    30 

Balances,   Counter    47 

Balances,   Cream   Testing.... 

41,   47.   357 

Balances,  Decimal  Milk 47 

Balance,    Demonstration    ....      49 

Balances,  Dispensing 47.   54 

Balances.   Family  Scales 48 

Balance,  Flour  Testing. ..  .54,  252 

Balance,   Gas  Density 286 

Balances,  Grain  Testing. ..  .41,   64 

Balances,  Hand 48 

Balance,  Harvard  Trip 54 

Balance,    Hydrostatic    51 

Balances,  Laboratory    

40,   48,    49,   62,   53 

Balance,   Large   Capacity   and 

High    Sensitiveness    33 

Balance.  Lecture  Table 49 

Balance,  Magnallum 40,  49 

Balances,    Milk    ...41,   47.   357 

Balances,  Moisture    42,   49 

Balances,   Platform    50 

Balances,  Prescription 42.   51 

Balances,   Pulp    39.  40 

Balances,  Seed  Testing 41.   42 

Balances,  Soil    43.   61 

Balances,  Solution. .  .42,  43,  51,   54 
Balances,  Specific  Gravity. . .  . 

.44,   51,   52 

Balances,   Spring    52,   53 

Balance,   Stoddard    63 

Balances,    Torsion    41-46 

Balance,    Trip    54 

Balance,  Triple  Beam 65 

Balance  Brushes   109 

Balance  Covers    61 

Balance   Desiccator    61 

Balance   Levels    61 

Balance  Magnifier   61 

Balance  Pans  61 

Balance  Reading  Glass 61 

Balance   Rests    61 

Balance  Riders    56 

Balance   Supports   of  Glass..     61 

Balance  Wall  Bracket 61 

3alance  Watch  Glasses 61 

Balance  Weighing  Scoops.. 61.   62 
Balance  Weighing  Tube  Sup- 
port         62 

Balance  Weights 55-60 

Balls,  Porcelain  for  Ball  Mills  180 
Balls,     Steel,     for     Hardness 

Tester  304 

Ball    Mills    179.180 

Ball    Mill    Jars 179,   180 

Ball   Tester    303.   304 


Balling  Hydrometers   ....313,   315 

Balloons    63 

Balloons,   Collodion    63 

Balloons  for  Filtering-,  Pukal   237 

Balloons,  Gas   63 

Balloons,    Glass    63,  245 

Balloons,  Rubber   63 

Balloons,  Specific  Gravity....      63 

Balloon  Flasks   245 

Balsam   Bottles    99 

Bands.  Rubber    428 

Band  Tubing,  Rubber 431 

Bars.   Standard,   for  Hardness 

Tester   304 

Bar  Form   Solder    460 

Barker  Carbon  Dioxide  Appa- 
ratus      129 

Barkometers    (Hydrometers).    312 
Barnes       Dissecting       Micro- 
scopes       341 

Barnes   Dropping   Bottle 99 

Barographs    65 

Barometers    63-65 

Barometer   Tubes    65 

Barometer  Tubing   297 

Barrett    Mfg.    Co.    Apparatus 
for  Tar,  Oils  and  Pitches.  .18-25 

Barthel's   Alcohol   Stoves 120 

Barthel's    Automatic    Burners  120 
Basket  Form   Slide  Holder...    350 

Baskets  for  Test  Tubes 4R1 

Bates   Sugar   Flask 250 

Baths,  Air 250,  383-388 

Baths,   Constant  Temperature 

383-385,    393.   394 

Baths,  Hot  Air 2nO.   383-388 

Baths,   Paraffine   Embedding. 

392.   393 

Baths.    Sand     433.   434 

Baths,   Vaccine   Culture. .  .517-519 

Baths,   Wassermann   517-519 

Baths,  Water    513-520 

Batteries,   All   Kinds 66-74 

Batteries,  Dry    66,   67 

Batteries,   Edison   Primary...      67 

Batteries,   Galvanic    '...66-74 

Batteries,  Plunge    69 

Batteries,  Primary 66-70 

Battery,  Standard  Cell 70 

Batteries.    Storage    70-73 

Battery  Binding  Posts 75 

Battery  Charger   313 

Battery  Connections    76 

Battery    Directions         74 

Battery  Fluid,  Cenco  Sulpho- 

Chromic    74 

Battery  Hydrometers    313 

Battery  Jars.  .  .66-70,   72,    326.   327 

Battery  Motors    214 

Battery  Porous  Cups 66.    68 

Battery   Rheostats.  .  .214,   224,   225 

Battery  Screws    75 

Battery   Syringe    313 

Battery   Zincs    66-68.   61 

Baumg   Hydrometers    311-315 

Beads,  Glass   295 

Beakers    77.   78,   475 

Beakers,  Aluminum   78 

Beakers,  Copper    78    475 

Beaker,   Digestion    475 

Beakers,  Fused  Silica 78 

Beakers,   Glass    77,   78 

Beakers,   Griffin's    77 

Beaker,      Heavy      Tumbler 

Shape    78 

Beakers.    Nickel    Plated    Cop- 
per     78,   475 

Beakers,   Phillips    246 

Beakers,  Porcelain 78 

Beakers,   Pyrex    77 

Beakers,   Sugar    78 

Beakers,   Transparent    Quartz     78 

Beaker    Brushes    108 

Beaker  Clamps    146 

Beaker  Cover  Glasses.  ..  .407,   512 

Beaker  Flasks   246 

Beekmann    Molecular   Weight 

Determination  Apparatus..  400 
Beckmann  Thermometers  .  . .  493 
Beehive  for  Pneumatic 

Troughs    506 

Bees'  Wax   521 

Beer  Hydrometer   313 

Beer  Still    199,   204 

Beet   Shredding   Mills 181 

Bell    Glasses    79,   80 

Bell  Jars 79,   80 

Bell  Glass  Dialyzer 186 

Bellows    88 

Bells,   Electric    80 


rKNTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


531 


Page 

Belt  Grinder 337 

Belting,  Leather -:..    332 

Bench  Level,  Adjustable 333 

Bench     Photometer.     Station- 
ary     290.  291 

Bender    &    Holbein's     Potash 

Bulb    41S 

Bending   Tubing,    Glass 296 

Eennert's    Absorption    Appa- 
ratus        204 

Bennert's  Drying  Apparatus.  204 
Bennings  en's  Elutriating 

Flask    247.   449 

Benzine  Hydrometer 3 

Benzine    Vapor    Apparatus...    278 

Berkefeld  Filters ,...    235 

Berkshire  Sand   520 

Bernard'sWire  Cutting  Pliers  412 

Berzelius  Gas  Holders 288 

Berzelius-Pepys   Gas   Holders  288 

Bessemer   Goggles    298 

Biffl-Brooks  Coagulometer. ..  83 
Bimetallic  Gas  Regulator...  500 

Bins    81 

Binding  Posts  for  Batteries.  75 
Binding  Screws,  Battery....  75 

Bits,  Auger 25 

Bit  Braces 81 

Bitumen   Crucible    20.   173 

Bitumen  Holder   23 

Bituminous    Testing   Appara- 
tus     18-25 

Black's   Blowpipes    93 

Black    Lead    Crucibles 172 

Black  Rubber  Tubing 430.   431 

Blackboard   Drawing   Instru- 
ments        202 

Blackfan's  Wet  Cup 87 

Blackmar    Oil    Thief 379 

Bladders    81.  401 

Bladder   Glasses    80 

Blades.   Hack  Saw 434 

Blair's   Drying  Oven 388 

Blair's  Platinum  Boat  Holder  408 
Blair's  Platinum  Combustion 

Boats     408 

Blair's  Platinum  Dish 409 

Blair's  Separatory  Funnel...  258 
Blair's  Stirring  Apparatus.  .  .  470 

Blair's  Reductors   427 

Blair's  Rubber  Policemen....   429 

Blair's  Water  Bath 514 

Blake   Pinning   Forceps 256 

Blast  Apparatus. .  .88-92,   122,   269 

Blast  Blowers 88-92.  269 

Blast  Burners 119-122.  269 

Blast  Burner,  Fletcher's....  120 
Blast  Burner,  Massachusetts 

Institute  Pattern    119 

Blast  Burners,  Meker 120 

Blast  Burner,  Wiesnegg"6. . . .   120 

Blast   Furnaces    

262,   264,   265.   268.   269 

Blast    Lamps    119-122 

Blast  Lamps  for  Alcohol.  120.  121 
Blast  Lamps  for  Gasoline...  121 

Blast   Pumps,    Air 89-92.   269 

Blocks,   Red   Fiber 354 

Block,  Support,  for  Soil  Tubes  459 

Block  Plane    406 

Block     Strop     for     Microtome 

Knives   355 

Block  Tin  Pipe 626 

Blood  Apparatus   82-87 

Blood   Capsules,  Wright's....      82 

Blood  Coagulators   83 

Blood  Collector,  Vacuum... 83.  84 
Blood  Counting  Apparatus. 84.  85 
Blood  Drying  Apparatus....  83 

Blood    Gas    Apparatus 82.  83 

Blood  Lancets    86 

Blood    Percentage    Tubes    for 

Haematokrit   134 

Blood    Pipette,    Wright's 87 

Blood  Pipettes  for  Haemacy- 

tometers    85 

Blood  Testing  Apparatus.  ..  82-87 
Bloom's  Calomel  Electrode.  .  397 

Blowers,    All    Kinds 88-92.  269 

Blowers  (Bellows)    88 

Blowers,   Blast    89-92,  269 

Blowers,      Crowell      Positive 

Pressure    90.  91 

Blower,   Electric.   Hot  Air....      88 

Blowers,   Foot    88 

Blowers,  Hand   88 

Blowers,  Power    89-92,  269 

Blowers,  Pressure   89-92.  269 

Blower    and    Vacuum    Pump 
Combined    89-92 


Page 
Blowers.   Water   Pressure....      92 

Blowpipes,   All   Kinds 

92,    93.    121.   189 

Blowpipe,    Alcohol    121 

Blowpipe.  Oxyhydrogen  ....  93 
Blowpipes  for  Zoological 

Work     189 

Blowpipe  Apparatus 93.   94 

Blowpipe    Capsules    93 

Blowpipe  Charcoal 93 

Blowpipe  Forceps 94.  256 

Blowpipe  Goods 93.  94 

Blowpipe   Hammers    !»4.  303 

Blowpipe    Lamps    94 

Blowpipe  Matrasses 94 

Blowpipe  Mouthpieces    92 

Blowpipe    Platinum    Mips.. 93.  408 

olowpipe  Reagents    94 

iiiowpipe   Set   94 

Blowpipe  Tips 93,   123.  408 

Blowpipe    Tubes    for    Bunsen 

Burner    123 

Blue  Glass  Goggles 298 

Blue  Glass  Plates 407.  408 

Blue  Green  Hones 354 

islue  Print  Paper 390 

Board,    Asbestos    17 

Board,    Botanical   Mounting..      95 

Board,   Drawing    201 

Boards,   Insect  Spreading....    326 

Board  of  Health  Tubes 

141,   487.   488 

Boats,  Combustion   161,  162 

Boats,    Combustion,    Clay....    162 
jboats.  Combustion.  Fused  Sil- 
ica        162 

Boats,  Combustion,  Platinum  408 
Boats,  Combustion,  Porcelain  162 
Boats,  Combustion.  Quartz...  162 
Boats,  tillering.  Platinum...  408 

Bobs.  Plumb 412 

UOCKIUS   Measuring   Bottle...   100 

Boggs    Coagulometer    83 

toners,   Agateware    329 

toilers    (Saucepans)    130 

Boiling  Flasks    244.  245 

Boiling   Point   Apparatus. 400.  401 

Boiling    Point   Tuoes 400.  401 

Boland's   Flour   Tester 252 

Bolting   Cloth.   Silk 255.   441 

tolling   Cloth   Disks 520 

Bomo    Calorimeters    for    Coal 

and  Oils   126-128 

Eomb      Calorimeter.       Parr's, 

Adiabatic   Oxygen    128 

Bomb      Calorimeter,      Parr's, 

Oxygen    127 

Bomb      Calorimeter,      Parr's. 

Standard    126 

Bomb  Furnace,  Carius 270 

Bomb  Furnace,  De  Khotinsky  270 

Bomb  Tubes.   Glass 297 

Bone  Ash  Cupels 182 

Bone-Cutting   Forceps    189 

Bone  Mills    177.   178 

Bone  Saw    190 

Books,  Chemical  Label 330 

Books,   Litmus    390,  391 

Boots  Specific  Gravity   Bottle  104 

Borers,    Charcoal    93 

Borers,  for  Cork 167 

Borers,  Soil    452.  453 

Boring  Machine  for  Corks...    167 
Boston  Board  of  Health  Ster- 
ilizer       469 

Bostrom  Level 483 

Botanical  Absorption  Paper.95,  96 
Botanical  Adhesive  Tape....  95 
Kotanical  Collecting  Case.  ...  95 
Botanical  Drying  Paper.... 95.  96 

Botanical  Genus  Covers 95 

Botanical   Herbariums    96 

Botanical  Mounts,  Riker's....  95 
Botanical  Mounting  Board...  95 
Botanical  Mounting  Paper...  96 

Botanical  Plant  Press 95.  96 

Botanical  Pressing  Paper....  96 
Botanical  Species  Covers....  96 

Botanical   Supplies    95,  96 

Botanical  Vasculum    95 

Bottles,   All  Kinds    97-107 

Bottles.    Acid    98,366 

Bottles,  Aluminum  Screw  Cap 

103,  106,  357 

Bottles,    Aspirator    98,   99.   445  ! 

Bottles,    Balsam    99 

Bottles,  Bockius  Measuring.  .  100 
Bottle,  Butter  Testing.  .  .357,  358 
Bottles,  Ceresine  106 


Page 
Bottles.  Combination  Acid  for 

Milk   Testing    ...........    356 

Bottles,  Cream  Testing.  .  .357,  358 
Bottle,  Cyanide   .............   100 

Bottles,    Dropping    ..........      99 

Bottles.   Ether    ..............    105 

Bottles,  Gas,  Cubic  Foot  .....    292 

Bottles,   Gas   Generating  .....   287 

Bottles,  Gas  Washing  .......      294 

Lotties,  Graduated    ......  183,  31 

Bottles,    Gutta    Percha  .......    103 

Bottles,  Hard  Rubber  ........    103 

Bottles.   Homeopathic    ....... 

Bottles,    Immersion    Oil  ......    1 

Bottles,    Insect    .............    100 

Bottle,    Measuring,   Bockius..   100 
Bottles,    Mechanical    Analysis  446 
Bottles,   Milk   Testing  ----  367.  358 

Bottles.    Mixing    .........  183.  327 

Bottles,  Oil  Sample  ..........   100 

Bottles.    Percolator    .........   3 

Bottles,    Pipette    ............   4 

Bottles,   Pressure    ...........    100 

Bottles,    Reagent    ........  101-103 

Bottles,  Sample   ..........  ...    105 

Bottles,    Screw   Cap  .......  103.  357 

Bottles,    Serum    .............   103 

Bottles,  Shaking   ............   455 

Bottles,    Shell    Vials  .........    103 

Bottles,    Show    ..............    104 


..  .  .  104.   105 

Bottles,    Specific    Gravity    for 

Cement    ...............  104.  105 

Bottles,        Specific        Gravity. 

Hubbard's    ................  104 

Bottles,    Specimen.  .  ..105,  327.  328 

Bottles,    Sputum    ............    141 

Bottles,  Tubulated   ........  98-107 

Bottles,   Vaccine    ............    103 

Bottles,  Volatile  Liquid  ......   105 

Bottles,   Washing  ----  105,  106.  294 

Bottles,  Water  Sample  .......   106 

Bottles.   Wax    ...............   106 

Bottles,    Weighing    ......  106.107 

Bottles.  WoulflTs   ............   1 

Bottle  Brushes    ..........  108,  109 

Bottle   Caps,    Lead  ...........    187 

Bottle  Caps,   Reagent  ........   1 

Bottle    Forceps    .............   2 

Bottle  Rack.  Babcock's  ......   3 

Bottle  Rest   .................    107 

Bottle   Shaking  Apparatus... 

..............  438-440,  454,   455 

Bottle   Trunnion,    Acid  .......    356 

Bougies   for   Filtering  ----  237,  238 

Bourdon  &  Bourdet  Hydroti- 

meter    ....................   SI! 

Bowen's   Potash  Bulb  ........   413 

Bowls,   Porcelain    ........  107.  263 

Boxes,   All  Kinds  ............ 

...........  20,   107,   108,  241,  264 

Boxes.   Aluminum    .......  107.  187 

Boxes,    Cubic   Inch  ...........    252 

Boxes,   Tin    ...............  20.  108 

Boxes,    Wood    ...............   108 

Boxes  for  Culture  Dishes....    181 

Boxes  for  Filter  Paper  .......   241 

Boxes  for  Germinating.  .  .299,   300 
Boxes  for  Micro  Slides  .......   349 

Boxes   for   Paraffine   Embed- 

ding ......................    354 

Boxes,   Pasteboard    ..108,  241.  254 
Boxes  for  Pipettes  ...........    406 

Boxes,    Resistance    .......  220-222 

Boxes.  Slide   .............  108.   349 

Box  Form  Electroscope  ......    42i 

Boxwood  Measures  ..........   435 

Boxwood  Rules   .............    435 

Boyce   Acme  Safety   Burner.  .    118 
Boyce  Adjustable   Burner....    118 

Brace,   for  Bits  ..............      81 

Brady's   Sulphur  Apparatus.  .        8 
Bramwell    Penetrometer    ....    133 

Brass   Blowpipes    ..........  92.   93 

Brass  Condenser   ............    165 

Brass  Connecting   Tubes  .....    506 

Brass  Crucible  Tongs  ........   5 

Brass   Forceps    ............  62.   256 

Brass  Gauze   ................   523 

Brass  Rod   ..................    524 

Brass   Sheet    ................    524 

Brass  Sieves   .............  440-442 

Brass    Stop-Cocks    .......  470.   471 

Brass    Strip    ................    524 

Brass  Wire   .................    521 

Braun   Acid   Feeder  ..........    251 

Braun  Blast  Burners.119.  12S.  269 
Braun  Crucible  Furnaces.264,  268 
Braun  Crushers  .....  175,  176,  181 


532 


CENTRAL,  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Page 

Braun  Electrolytic  Outfits...  229 
Braun  Flotation  Machine. . . .  251 
Braun  Muffle  Furnaces.  .268.  269 

Braun  Oil  Feeder   251 

Braun   Pulverizers    181 

Braun  Sample  Grinders 176 

Braun   Samplers    433 

Braun        Vulcan        Non-Blast 

Burners    119.   269 

Brazing  Blowpipe 93 

Breast   Drills    203 

Breeding   Cages,    Insect 326 

Bridges,    Conductivity    

222,    223,    403,   455 

Bridge,    Slide    Wire 403 

Bridges,  Wheatstone 

222,    223,    403.   455 

Bridge  Form  Clamp  Support  151 
Briggs'  Filtering  Apparatus. 

236,  237 

Briggs-McLane    Centrifuge...   447 

Brinell  Ball  Testers 303,   304 

Brinell  Hardness  Testers. 303.   304 

Brinell  Machines    303,   304 

Brinell    Magnifiers     304 

Brinell  Meter   304 

Brinell  Microscope 304 

Briquette  Mold,  Asphalt.....  23 
Briquette  Molds  for  Cement. .  131 

Briquette    Mold    Brushes 131 

Briquette     Rammer     for     Ce- 
ment        133 

Bristles,    Shoemakers'     189 

Bristol  Board   129 

Brix  Sugar  Hydrometers....  316 
Brodie-Russell-Boggs  Coagu- 

lometer    83 

Bromwell   Fusel  Oil  Appara- 
tus      271 

Brown-Duvel  Moisture  Appa- 
ratus     301.  302 

Brown  Evaporator 22 

Brown  Oil  Still 378 

Brown's   Pyrometers    417-419 

Brown-Sharpe   Calipers. .  .125.  391 

Brushes,  All  Kinds 

108,    109,   131,   453,   459 

Brushes  for  Briquette  Molds.  131 
Brushes,  Sampling  Tube.  109,  453 

B.  S.  Tubes  for  Oil 140.   374 

Buerker's   Counting   Chamber     84 

Buck's  Iron  Mortar 367 

Bucket   for   Waste 390 

Bucking   Boards    175 

Bucking  Board  Brushes 103 

Buechner's  Funnels 268 

Buffing  Wheels.  Muslin 412 

Bulbs,   Absorption    

8,  9,  160,  161,  371,  413,   414 

Bulbs  for  Constant  Blast....  88 
Bulbs  for  Connecting,  Kjel- 

dahl's    371 

Bulbs,  Drying. .  .124,  413,  414,  424 
Bulbs  for  Gas  Apparatus....  110 

Bulbs,   Glass    8. 

9,   63,  110,  160,  161,   371,   413,   414 
Bulbs,  Leveling  for  Gas  Bu- 
rettes        110 

Bulbs,    Nitrogen    371 

Bulbs,  Pipette    428 

Bulbs,  Potash    413,  414 

Bulbs,    Rubber    279.  428 

Bulbs,    Vapor   Density 63,   510 

Bulbs  for  Weighing  Gases...      63 
Bulb     Connecting     Tube     for 
Marshall's    Urea    In     Blood 

Apparatus    87 

Bulb   Expander    431 

Bulb  Tubes 199,  200,   427 

Bulb   Tube,   KJeldahl's 371 

Bulls-Eye  Condenser 345 

Bunsen    Alkalimeter    129 

Bunsen  Barometer 65 

Bunsen    Battery    66 

Bunsen  Blast  Lamp 119 

Bunsen  Burners..  113-116,  118,  119 
Bunsen  Burners  for  Gasoline 

Gas    118 

Bunsen    Carbon    Dioxide    Ap- 
paratus         129 

Bunsen    Clamps    146.   148 

Bunsen   Condenser  Clamps...    146 

Bunsen    Eudiometers     230 

Bunsen-Fresenlus        Chlorine 

Absorption  Apparatus 145 

Bunsen    Funnels    257 

Bunsen    Oas    Absorption    Ap- 
paratus         145 

Bunsen  Measuring  Tubes....  289 
Bunsen  Photometers  290.  291 


Page 

Bunsen   Screw  Clamp 148 

Bunte    Gas    Burettes 282 

Bureau  of  Mines  Flash  Point 

Testers    376 

Bureau   of   Mines   Gas  Analy- 
sis Apparatus    276.   277 

Bureau     of     Mines     Gasoline 
Distillation  Apparatus    ....    374 

Bureau  of  Soils  Sieves 441 

Bureau  of  Standards  Sieves..    441 

isurtttes,  All  Kinds 

111-113,   282,   283,    356,   363 

Bui  cues,   Acid    356 

Burettes.   Automatic.  112,    356,  3tiJ 

Burettes,   Caliorating    112 

Burettes,    certified     112,   113 

Burettes,    Dispensing    112 

curettes.   Gas  Analysis.  .  .282,   283 

.burettes.  Precision   112,  113 

Burette,   Weighing 112 

Burette    Accessories    113 

tiurettu   Attachments    113 

Burette  Brush    108 

Burette   Caps    113 

Burette    Clamps    146 

iiurette    Funnel     113 

Burette  Pinchcocks   i47 

Burette  Keader   113 

tiurette  Stop-Cocks    472 

curette   Supports    478 

Burette  Tips 113 

Burrell's  Gas  Apparatus 278 

Burker-Neubauer      Haemacy- 

tometer 84 

Burners,   All   Kinds 

113-122,    264,   269 

Burner,   Acetylene    113 

Burner,   Acme   Safety 118 

Burners,  Adjustable   118.   119 

Burners,   Alcohol    120,   121 

Burners,   Argand    114,   116 

Burners,  Barthel   120 

Burners,  Blast.  .  .119-122,  264,   269 

Burners,  Boyce    118 

Burners,   Braun   Vulcan   Non- 
Blast     119.   269 

Burners,  Bunsen.  .113-116,  118,  119 
Burner,      Carpenter's     Metro- 
politan Argand    292 

Burner,  Cary's  Gasoline  Blast 

122.   269 

Burners,   Central   Draft 114 

Burner,   Chaddock's    114 

Burners,   Coal  Gas 113-120 

Burner,  Combustion  Tube....    116 
Burner,   Concentric    (Radial) .    116 

Burner,  Dangler 122 

Burner,  Detroit   118 

Burner,  Evaporating 116 

Burners,  Fletcher's 116,   120 

Burner,   Fletcher's   Blast 120 

Burner,  Gas  Flame  Testing.  .    376 
Burners   for  Furnaces.  ..  .264,   269 

Burners,   Gas   Stoves 117 

Burners  for  Gaseous  Fuel. 113-120 

Burners   for   Gasoline 

121,    122,  264,   269 

Burners,  Gauze  Top 116,   117 

Burners,   Glass   Blowers' 117 

Burner,   Greenman    117 

Burners,    High    Temperature.    119 
Burners,  Hot  Plates  for  Gas. 

117,   310 

Burners,  Hydro-Carbon    

122,   264,   269 

Burners,    Illuminating    117 

Burners,   Kerosene    122,  264 

Burners,   Koch   Safety 114,   115 

Burners  for  Liquid  Fuels.... 

120-122,    264,   269 

Burner,    Low    Temperature..    116 

Burners,   Meker    115,  120 

Burners,   Micro    114 

Burners,  Multiple   Tube 

...115,   116,   119 

Burners,   Oil    122,   264 

Burner,  Pilot  Light 113 

Burner,    Porcelain    114 

Burner,  Ring  Form 118 

Burner,  Ring,  for  Tar  Testing     20 

Burner,   Scimatco    119 

Burner,    Soldering    Iron 118 

Burner,   Solid  Flame 116 

Burner,  Spectrum   366 

Burner,  Teclu 118 

Burner,   Tlrrill's    118 

Burner,   Wiesnegg   Blast 120 

Burner  Attachments    123 

Burner   Blowpipe    Tubes 123 

Burner  Chimneys 114,   115,   123 


Page 

Burner   Crown   Top 123 

Burner  Fork 123 

Burner  Gauze  Top 123 

Burner    Guard    123 

Burner   Star    123 

Burner  Supports 123 

Burner  Tips    123 

Burner  Tripod    123 

Burner   Tubing 117,    430.   431 

Burner   Wicks    120 

Burner   Wing   Tops 123 

Burning  Spoons   184 

Burrell's   Gas  Apparatus 278 

Butter   Analysis   Apparatus.. 

356,    357,   361,   363.   364 

Butter   Fat   Oil   Tubes.  ..  .364,   488 

Buttermilk   Test   Bottles 357 

Button   Balances    37.   38 

Button   Brush    93.   108 

Button   Forceps    94.   256 

Button's  Nippers  or  Pliers...    412 
Button   Weights    57 


Cabinets,  Desiccating  185 

Cabinet,  First  Aid 243 

Cabinets  for  Micro  Slides 349 

Cabinets,  Proofing  254 

Cabinets,  Tool  503,  504 

Cadmium  Normal  Elements.  397 

Cages  for  Animals 12,  13 

Cages  for  Insect  Breeding...  326 
Calcium  Chloride  Cylinders.. 

124,  160 

Calcium  Chloride  Drying 

Tubes  124,  160.  161 

Calcium  Chloride  Holder  for 

Balances  61 

Calcium  Chloride  Jars  and 

Tubes  124,  160.  161 

Calcium  Chloride  Salometer 

(Hydrometer)  313 

Calcium  Chloride  Tubes 

124,  160.  161 

Calculating  Chart  (Nomon) .  373 
Calculator  (Chemists'  Slide 

Rule)  444 

Calculi's  Specimen  Jars 328 

Caldwell's  Crucible  172,  174 

Calibrallng  Apparatus...  .112,  404 

Calibrating  Buretles  112 

Calibraling  Pipettes,  Ost- 

wald's  404 

Calipers,  All  Kinds 125 

Calipers,  Micrometer 125 

Calipers,  Vernier  125 

Caliper  Rule  432 

Calomel  Electrodes  397 

Calorimeters  and  Accessories 

126-128,  283-285 

Calorimeter,  Mahler  127 

Calorimeter,  Parr's  Adiabatic 

Oxygen  Bomb  128 

Calorimeter,  Parr's  Oxygen 

Bomb  127 

Calorimeter,  Parr's  Standard  126 

Calorimeter  Press  128 

Calorimeter  Thermometers... 

126,  127,  284,  494 

Calorized  Steel  Pyrometer 

Tubes  421 

Camel's  Hair  Brushes 109 

Camera  for  Color  Comparator 

Tubes  154 

Camera  Lucida,  Abbe 343-344 

Camp's  Absorption  Tube....  8 
Camp's  Color  Comparison 

Tubes  153 

Camp's  Shaking  Apparatus..  438 

Campbell-Hurley  Colorimeter  154 

Canada  Balsam  Botlles 99 

Candles,  Photometric  292 

Candles,  Standard  292 

Candles,  Turbidimeter  507 

Candle  Balance  292 

Candle  Power  Determination 

Apparatus  290,  291 

Cane  Sugar  Mills 179.  181 

Cans,  Aluminum  107.  187 

Cans,  Soil  Sample 107,  454 

Capillarity  Tubes  for  Soil.457.  458 

Capillarity  Tube  Supporl 458 

Capillary  Eleclrode  Tubes... 

398.  399 

Capillary  Electrometers.  .398,  399 

Capillary  Glass  Tubing 297 

Capillary  Pipette  404 

Capillary  Stop-Cocks 471,  472 

Capillary  Tubing  297 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


533 


Page 

Caps  for  Burettes 113 

Caps  for  Reagent  Bottles 102 

Caps,  Rubber,  for  Test  Tubes   428 

Caps,  Tin   357 

Capsules,   Alundum    162 

Capsules,    Blood,    Wright's...      82 

Capsules,    Clay    

Capsules,   Combustion    ...1211.   1 

Capsules,   Lead-Tin    Foil 187 

Capsules,  Milk  Analysis.  .129,  358 

Capsules,   Porcelain    129,   187 

Capsules,    Silica    162 

Capsule  Spoon   * 

Carbon,   Granulated   »24 

Carbons   for   Arc   Lamp 346 

Carbon  Apparatus,  Parr's....    126 

Carbon   Baths    513,   514 

Carbon    Blocks    for    Blowpip- 

ing   

Carbon  Clamps    93 

Carbon    Combustion    Appara- 
tus     160,   161.  409 

Carbon  Combustion  Bulbs...  8,9 
Carbon  Comparison  Tubes..  153 
Carbon  Cylinder  for  Blowpip- 

ing   93 

Carbon   Determination   Appa- 
ratus     160,   161,  409 

Carbon      Dioxide     Apparatus, 

Frederlcia    82 

Carbon      Dioxide     Apparatus, 

Van  Slyke's    83 

Carbon     Dioxide     Determina- 
tion Apparatus    129 

Carbon   Dioxide  Freezing  At- 
tachment for  Microtomes..    354 
Carbon  Dioxide  and  Methane 

Determination   Apparatus..   276 
Carbon   Dissolving   Tubes.487.   488 

Carbon  Filament  Lamps 331 

Carbon  Filter  Tubes 257 

Carbon   Residue   Flasks 247 

Carbon  Resistance  Furnace..    271 

Carbon    Rheostats    224 

Carbon   Rod    524 

Carbon  Sheet   524 

Carbon   Tubes    153 

Carbon   Tube   Support 154 

Carbonic  Acid  Apparatus....  129 
Carbonic  Acid  Determinaton 

Apparatus    129 

Carbonic  Acid  Flasks 247 

Carbonic   Acid    Gas 274 

Carbonic       Acid       Generating 

Apparatus    287 

Carborundum   Paper    390 

Carboys,    Glass    129 

Carboy    Inclinator    129 

Carboy  Pumps    9 

Carboy  Stands   129 

Carboy    Tilter    129 

Cardboard     129 

Carius    Explosion   Furnace...    270 

Carius  Tubes    297 

Carnot  Funnel   258 

Carnotite    425 

Carpenter's   Metropolitan   Ar- 

gand  Burner 292 

Carpenters'  Work  Bench 523 

Cartilage  Knife   190 

Cartilage    Shears    193 

Cartridges,    Extraction.  .  .232.   233 
Cartridges  for  Oxygen  Gener- 
ator        288 

Gary's   Furnaces    269 

Gary's  Gasoline  Blast  Burner 

122,  269 

Gary's  Hydro-Carbon  Furnace 

Burners    122,   269 

Cases  for  Blood  Counters....      85 
Cases    for   Dissecting   Instru- 
ments        193 

Cases,  Filter 241 

Cases  for  Haemacytometers.  85 
Cases,  Mailing  for  Samples..  254 

Cases,   Mailing   for   Slides 350 

Cases   for   Pyrometers 419-420 

Casein  Tubes 138,    141.   358 

Caslte  Cupels  182 

Casseroles,  All  Kinds 129-130 

Casseroles,    Agateware    130 

Casseroles,    Porcelain    ....129-130 

Casseroles,   Silica    130 

Cassia   Flask    246 

Cast  Iron  Crucibles 427 

Catalase  Apparatus    358 

Cathodes.  Platinum    410 

Cavity  Plates 408 

fedar  Oil  Bottles 100 

Cedarwood    Oil.    Immersion...   345 


Page 

Cells,  Battery 66-73 

Cells      for      Calomel      Normal 

Electrodes   397 

Cells,   Conductivity    396 

Cells   for   Gas    Electrodes 398 

Cells   for  Half   Elements 399 

Cells   for   lonization 403,  399 

Cells  for  Micro  Slides 349 

Cells,    Porous    66,68 

Cells,   Selenium    438 

Cells,   Slide  Mounting 349 

Cells,   Standard    70 

Cell,    Weston    Standard 70 

Celluloid    Rule     432 

Celluloid   Strips    457,  458 

Cement,    Alundum    130 

Cement,    Asbestos     17 

Cement,    DeKhotinsky    Labo- 
ratory        130 

Cement,  Liquid  Porcelain....    130 

Cement,  Loxol    liO 

Cement,  yuixo 130 

Cement,   Detractory  Alundum   130 

Cement,   Kuober    429 

Cement  Briquette   Molds 131 

Cement  Indenting  Needles... 

132,   133 

Cement  Molds    131-133 

Cement   Mold   Brush 131 

Cement   Mold   Tamper 132.   133 

Cement  Pan   132 

Cement  Scales    46 

Cement  Sieves   441 

Cement   Testing    Apparatus.. 

131-133.   135 

Cement  Testing  Balances...  46 
Cement  Testing  Machines... 

131,   133 

Cement   Testing  Molds 131-133 

Cement  Testing   Sand,  Stand- 
ard        132 

Cement    Testing    Scales 46 

Cement   Testing    Sieves 441 

Cement    Testing    Trowels....    133 
Cenco    Ammeters    and    Volt- 
meters     209 

Cenco    Analytical    Balances..      36 

Cenco    Blowers    89 

Cenco     Blower    and     Vacuum 

Pump     89 

Cenco      Electric     Heater     for 

Volatile  Fluids   233.   305 

Cenco   Electric   Motors 216 

Cenco-Nelson    Pumps    415 

Cenco   Polar   Stills 196,   197 

Cenco  Rheostats 224 

Cenco  Stencils   463 

Centigrade   Thermometers,  All 

Kinds    490-499 

Central    Draft    Bunsen    Burn- 
ers        114 

Centrifugal  Machines  ....141-143 
Centrifuges  and  Accessories 

19.  134- 

143,    359.    360,    373,    374,    446,    447 
Centrifuges  for  Asphalt  Test- 
ing          19 

Centrifuges,    Electric    

19,  135-140,  359,  360,  374,  446,  447 
Centrifuges,    Hand    and    Wa- 
ter Motor    134,   373 

Centrifuges    for   Mineral    Ag- 
gregate           19 

Centrifuge,   Moisture   Equiva- 
lent       447 

Centrifuges  for  Oil  Testing.. 

373,   374 

Centrifuges,   Soil    446.   447 

Centrifuge  Heads 

134,    136,    138-142.439 

Centrifuge  Tubes    

134,    135,    138,    140,    141,    374,   446 

Centrifuge   Tube    Balance 143 

Ceresine    Wax    Bottles 106 

Certified  Burettes    112.  113 

Certified     Cylindrical     Gradu- 
ates        183 

Certified  Thermometers.  .  .491-495 
Certified  Volumetric  Flasks.  250 
Certified  Volumetric  Pipettes  406 
Chaddock  Beaker  and  Dish 

Clamps    146 

Chaddock  Burette  Support...    478 

Chaddock  Burner   114 

Chaddock   Clamps    146,   147 

Chain    Vernier    Balances 30 

Chain    Tapes    484 

Chalk   Line    165 

Chamberland-Pasteur       Pres- 
sure   Filters     236.237 


Page 

Chambers,    Moist    181 

Chamois    Skins    144 

Chancel's   Gas   Apparatus....   281 

Chapman's  Filter  Pumps 242 

Charcoal,    Blowpipe    93,  144 

Charcoal  Borers    93 

Charcoal   Capsules    93 

Charcoal  Holders    93 

Charcoal   Squares    93 

Charcoal  Sticks    93.   144 

Chardin   Filter  Paper 238 

Charging   Cap    424 

Charging     Rod     for     Electro- 
scopes         424 

Chargometer    (HydromeWr)..    313 

Chart,  Cross  Section 169 

Charts,   Element    144 

Charts.    Frost's   Gasometer.  . .    235 

Charts,    Lecture    Room 

144,    145,   169 

Charts,  Metric    145 

Charts.    Milk    Record 358 

Charts,   Spectrum 145 

Charts,    Wall    144,   145.   169 

Cheese   Cloth    145 

Chemical  Centrifuges    ....134-143 

Chemical  Labels    330.   331 

Chemical   Stencils    463 

Chemical  Ta"bles 144 

Chemical    Thermometers.  .490-492 

Chemists'    Slide    Rule 444 

Chests  of  Tools 503,  504 

Chidlow  Expansion  Jar 252 

Chldlow  Gas  Collecting  Jar..    253 

Chimneys,    Argand    114,  145 

Chimneys   for   Burners 

114,   115,  123,   145 

Chimney,  Star  Support  for...    123 
Chimneys,  Student  Lamp.  145.  458 

Chipmunk  Crushers    175,  176 

Chisels    145 

Chisel   Blade  Microtome  Knife  355 
Chloride     of     Calcium     Cylin- 
ders     124,   160.  161 

Chloride    of    Calcium    Holder 

for  Balances  61 

Chlorine   Absorption    Appara- 
tus        145 

Chlorine    Gas,    Liquefied *74 

Chlorine   Generators    287 

Chlorine   Tube    145 

Chopper,  Meat   178,   179,  181 

Chrome    Steel    Crushers. 175 

Chromel  Triangles,.  Hoskins'.    505 

Chronometer    473,  474 

Churns,    Dasey     358 

Circular  Saws    412 

Claissen    Distillation    Flask..   246 
Clamps,    All    Kinds. ..  146-152,  403 

Clamps,   Battery    76 

Clamps,   Culture   Jar 327 

Clamp,  Meter  Stick 160 

Clamps,   Watch  Glass 148 

Clamp    Fasteners    148 

Clamp   Holders    148 

Classen's    Platinum    Dish    for 

Electrolytic  Separation   409 

Classen's   Platinum    Electrode   4 

Claw  Hammer    303 

Clay   Capsules    

Clay  Combustion   Boats 162 

Clay  Combustion  Tubes 163 

Clay  Covers  for  Petrl  Dishes.    181 

Clay    Crucibles    93,   170.  171 

Clay  Pipes 404 

Clay   Plates.    Porous 408 

Cleaners,    Beaker    108 

Cleaners,  Burette    108 

Cleaners,    Test   Tube 110 

Cleveland    Fire   Tester 375 

Clinical  Microtome    351.   352 

Clinical       and      Physiological 

Apparatus    82-87 

Clinical       Thermometer       for 

Veterinary  Use    494 

Clinometer,    Abney's    482 

Clinostat    407 

Clips.    Spring    152 

Clips,   Watch   Glass 148 

Clock,    Interval    Timer 152 

Clocks.    Laboratory 152 

Closets.  Glass  for  Drying....    185 

Cloth.   Emery    230 

Cloth,    Cheese    145 

Cloth,   Cotton    152 

Cloth,    Rubber    429 

Cloth    for   Sampling 433,  454 

Cloth,    Silk    Bolting 255,441 

Cloth,  Tracing 162 

Cloth  Counting  Glass 334 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


P:-p-e 

(.loth  Oil   Tester 379 

Cloth  Tape   95,   486 

Cloth  Testing  Machines 489 

Coagulators  for  Blood  Serum 

Coagulometers    83 

Coal  Ashing   Dishes 162,   188 

Coal    Calorimeters    126-128 

Coal   Crushers    175-181 

Coal    Gas    Burners 113-120 

Coal   Grinders    176 

Coal  Oil  Pyrometers 422 

Coal    Samplers    432.   433 

Coats,    Laboratory    14 

Cobalt    Glass    Plates 407 

Coils,      Cooling      for      Water 

Baths    517 

Coils,   Induction    208,   399 

Coils,    Resistance    223 

Coll    Heaters,    Electric 306 

Coll   System    for   Galvanome- 
ters       206 

Coke  Grinders   176 

Cold  Chisels   145 

Cold    Test    Thermometers....    496 

Collars,    Hook    149 

Collecting       Apparatus       for 

Bacteria   10 

Collecting  Case,  Botanical...  95 
Collecting  Needles,  •Wasser- 

mann 83 

Collecting  Trowel   506 

Collecting  Tubes  for  Blood. 83,  84 
Collecting  Tubes  for  Gases..  286 
Collections,  Mineralogical. . . 

364,   365 

Collodion  Balloons 63 

Colony  Counting  Apparatus.  . 

168,  169 

Color  Comparators 153-159 

Color  Comparison  Tubes 153 

Color  Comparison  Tube  Cam- 
era        154 

Color   Dissolving   Tubes.. 487,   488 

Color   Reaction   Plates 408 

Color  Testing   Apparatus.  .153-159 

Color  Tray  for  Soils 457 

Color  and  Turbidity  Determi- 
nation   Apparatus    159,   507 

Colored    Glass    Goggles 298 

Colored  Glass   Plates 407.   408 

Colorimeters    154-159 

Colorimetric        Determination 

Apparatus    153-159 

Colorless    Lacquer    330 

Combination   Pliers    411 

Combination  Saw    434 

Combination   Square    463 

Combined     Acid     Bottle,     for 

Milk   Testing    356 

Combustion  Apparatus..  .  .160-163 
Combustion  Boat  Lining.  . .  .  162 

Combustion  Boats    161,   162 

Combustion    Boats,    Platinum   408 

Combustion    Boat    Shells 162 

Combustion  Capsules. 129,   162,   187 
Combustion    Crucibles,    Plati- 
num     408.   409 

Combustion   Furnaces. 116,   260-262 
Combustion    Furnace,   Fletch- 
er's         262 

Combustion      Furnaces,      Gas 

Heated    262 

Combustion  Furnace,  Glaser's  262 
Combustion  Furnaces.  Hos- 

kins   260 

Combustion    Furnaces,    Multi- 
ple  Unit   Electric 261 

Combustion   Spoons    184 

Combustion    Tester    278 

Combustion  Train,  Johnson's  160 
Combustion  Train,  Vanier's.  .  161 
Combustion  Tubes. ..163,  297,  408 
Combustion  Tubes.  Platinum.  408 
Combustion  Tube  Burner. .  .  .  116 
Combustion  Tubing,  Glass...  297 
Comer's  Automatic  Pipette.87,  404 
Compacting  Machines.  ..  .447,  448 

Comparators,   Color    153-159 

Comparison  Tubes,  Color.  153.  154 
Comparison  Tube  Support... 

154,   159 

Compartment  Incubators   ....    321 

Compartment  Ovens 387,   388 

Compasses,  Drawing.  163,   201.   202 

Compasses,  Magnetic 164 

Compasses,   Pencil    163  j 

Compound   Blast   Burner 120 

Compressed  Air  Burners,  Me- 

ker     120 

Compressed   Cork   Mats 168 


Page 

Compressed   Cork    Rings 168 

Compressed    Gases    £74.  275 

Compression  Pumps  for  Gases 

89-91,   414 

Compression  Testing  Machine 

for  Cement    131 

Compressors,  Air 89-91,   414 

Compressors,  Clamp  Screw..  148 
Compressor  Screw  for  Rubber 

Tubing    148 

Concave    Slides    349 

Concentric  Rings    428 

Concentric    Ring    Tripod 505 

Condensed  Milk  Hydrometers  314 

Condensers,   All   Kinds 

165,   230-232,    369 

Condenser,  Bulls-Eye    345 

Condenser  for  Extraction  Ap- 
paratus     230-232 

Condensers,  Kjeldahl 369 

Condenser,  Substage   343 

Condenser,    Tar    Testing 375 

Condenser    Clamps    146,   147 

Condenser    Supports    478 

Condenser     Trough,     for     Tar 

Testing    20 

Condenser  Tubes 166 

Condenser  Tube  for  Urea,  Fo- 

lin    508 

Conducting    Cord    623 

Conductivity    Apparatus    ....    448 

Conductivity  Bridges 403,   465 

Conductivity  Cells    396 

Conductivity   Cell    Support...    397 
Conductivity    of    Electrolytes 
Apparatus  and  Accessories. 

396-403 

Conductivity  Lecture  Appa- 
ratus   332,  333 

Conductivity  Vessel  Clamp...  397 
Cones,  Filtering,  Alundum...  237 
Cones,  Filtering,  Platinum..  408 
Cones,  Filtering,  Porcelain. ..  238 

Cones,  Measuring   273 

Cones,   Steel    273 

Cone  of  Wood 408 

Configuration   Atom   Models..    366 

Congo   Test   Paper 390 

Conical   Beakers    246 

Conical    Glasses     487 

Conical   Graduates    299 

Connecting   Bulbs,   Kjeldahl..    371 

Connecting    Tubes    506 

Connecting  Tubes  for  Mar- 
shall Urea  in  Blood  Appa- 
ratus    87 

Connectors    for    Batteries....      76 

Connectors,   Hose    308 

Connectors  for  Stop-Cocks...  471 
Constant  Level  Water  Tank..  285 
Constant  Pressure  Regulator 

274,   275,   294 

Constant  Temperature  Baths. 

401-403,    516-519 

Constant   Temperature   Ovens 

383-385 

Constant  Temperature  Regu- 
lators   500,  501 

Contact  Goniometers,  Pen- 
field's  298,  299 

Contact  Keys    228,   229 

Containers   or   Bins 81 

Converters,    Rotary    226 

Co-ordinate  Paper    169 

Coplin's   Staining   Jar 328 

Coppers,  Soldering 460 

Copper  Analysis.  Braun  Elec- 
trolytic Outfit  for 229 

Copper    Assay    Flasks.  ..  .246,  248 

Copper  Beakers 78 

Copper   Crucibles    171 

Copper   Condenser    165 

Copper    Determination    Flask  248 

Copper    Distilling    Flasks 248 

Copper  Drying  Ovens 386-388 

Copper     Fermentation      Tube 

Support     235.478 

Copper   Flasks    246,   248 

Copper    Flasks    for    Moisture 

Test    248 

Copper   Funnels    258 

Copper   Gas   Holder 288 

Copper   Gauze    523 

Copper   Measures    336 

Copper   Oxide    Flasks 246 

Copper    Paraffine    Embedding 

Baths     392,   393 

Copper   Retorts    427 

Copper    Rings    428 

Copper    Rod    525 


Page 

Copper  Sheet    525 

Copper  Stills    195-199,  204 

Copper    Test    Tube    Supports.    480 

Copper   Tubing    526 

Copper   Water   Baths 513-520 

Copper    Wire    Gauze 523 

Cord,  All  Kinds 17,   165 

Cord,  Asbestos   17 

Core    Baking    Oven 390 

Corks     166,   167 

Corks,    Rubber    301,   429 

Cork   Borers    167 

Cork   Borer  Sharpener 167 

Cork  Boring  Machine 167 

Cork    Extractors    167.   168 

Cork    Files    235 

Cork   Gage    168 

Cork  Knife   168 

Cork  Mats   168 

Cork    Plates    168 

Cork   Press    168 

Cork    Rings    168 

Cork   Sheet    168 

Corkscrews    168 

Corn  Test  Sieves 302,   441 

Cornet  Cover  Glass  Forceps..  256 
Coronary  Artery  Scissors....  192 
Corper-DeKhotinsky  Staining 

Apparatus    464 

Corrosive   Sublimate   Tablets.    363 

Cots,  Finger   243 

Cottle   Extraction  Apparatus. 

231.   232 

Cotton,   Absorbent    8 

Cotton      for      Plugging      Test 

Tubes    8 

Cotton   Cloth    162 

Cotton    Thread    501 

Cotton    Twine     507 

Coulometer,    Washburn's     Io- 
dine        397 

Counter,    Hand    Tally 168 

Counters,    Thread    334 

Counter  Balance   47 

Counter    Brush    108 

Counterpoised   BalanceScoops 

61,   62 

Counterpoised      Support      for 

Weighing  Bottles 62 

Counterpoised  Watch  Glasses 

61.   512 

Counterpoised      Weighing 

Scoops    61,   62 

Countershafts  for  Motors. 216,   416 
Counting  Apparatus  for  Bac- 
teria      168,    169.    520 

Counting  Apparatus  for  Blood 

84,   85 

Counting   Chambers    84.   85 

Counting-  Pipette  for  Bacteria 

in   Milk    404 

Counting  Plates 168,   169 

Couplings  for  Filter  Pumps..    242 

Cover    for    Balances 61 

Covers    for   Beakers 20,   407 

Covers,   Botanical   Genus 95 

Covers,  Botanical  Species....  96 
Covers.  Earthenware  for  Pe- 

tri   Dishes    181 

Covers,    Porous    Clay 181 

Covers      and      Receivers      for 

Sieves    441 

Cover   Glasses    for    Haemacy- 

tometers    84,   85 

Cover     Glasses,     Micro 350 

Cover    Glass    Forceps 256 

Crash  Towelling    504 

Crayons.    Wax    395 

Cream   Bottle    Brushes 109 

Cream   Pipettes    362 

Cream    Test   Balances.  .41,   47.   357 

Cream    Test   Bottles 357.   358 

Cream  Testing  Apparatus. 359-361 

Cremator,   Electric    169 

Creosote  Flasks,  Hempel 246 

Creosote  Funnels 257.  259 

Creosote     Sulphonation     Test 

Funnel    259 

Creosote  Testing  Apparatus.  18-25 

Crooke's  Radiometer 426 

Crosscut    Saws     434 

Cross    Section   Chart 169 

Cross   Section   Paper 169 

Crowell  Blast  Apparatus ..  .90,  91 
Crowell  Positive  Pressure 

Blower    90,   91 

Crowell  Rotary  Air  Pumps. 90,  91 
Crowell  Vacuum  Pumps.... 90.  91 

Crowfoot    Batteries    68 

Crown  Rolling  Mills ISO 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


535 


Page 

Crown  Top  for  Bunsen  Burn- 
er       123 

Crucibles,    All    Kinds 

13,  20,  93.  170-174 

Crucibles,  Alundum   170 

Crucibles,   Assay.  13,    170,   171.   1 

Crucibles,   Black   Lead 172 

Crucibles,  Caldwell 172.  174 

Crucibles,  Clay 13,  93.  170.  1 

Crucibles.  Copper 171 

Crucibles,   Denver    170,   171 

Crucibles.      Filtering,      Alun- 
dum       170 

Crucibles,      Filtering,      John- 
son's        171 

Crucibles,  Iron    171.  174 

Crucibles,    Melting,    Alundum  170 

Crucibles.   Nickel    171 

Crucibles,   Normal   School....    174 

Crucibles,  Platinum    408.  4i 

Crucibles.  Plumbago   172 

Crucibles.    Porcelain.  .20.    172.   173 
Crucibles,     Porcelain,     Gooch 

for  Asphalt    20,  173 

Crucibles,    Quartz    1 

Crucibles,    Rose's    1 

Crucibles,  Sand    173 

Crucibles,   Silica    174 

Crucibles,    Sliver    174 

Crucibles,    Skidmore    174 

Crucibles   for  Sulphur  Deter- 
mination in  Coal  and  Coke  1' 
Crucibles.  Transparent  Quartz   173 
Crucible   Furnaces,  All  Kinds 

263-265.   268 

Crucible  Furnace,  Braun's...   264 
Crucible   Furnace.   Case  Melt- 
ing       264 

Crucible  Furnaces,  Fletcher's 

264,  265 

Crucible  Furnaces,  Hoskins..    263 
Crucible     Furnaces,     Multiple 

Unit  Electric    263 

Crucible   Holders    174 

Crucible   Supports    1 

Crucible    Tongs    502.   503 

Crucible    Tubes,    Rose's 173 

rrurible    Tubing.    Rubber 431 

Crude  Fiber  Flask 249 

Crushers,    All    Kinds 175-181 

Crushers.  Ice    3 

Crushers,  Ore   1 

Crusher  Brushes   109 

Crushing.    Grinding   and   Pul- 
verizing  Apparatus    ....175-18 

Gyroscopes    400 

r-rvsta'lization    Dishes    188 

Cube  Molds  for  Asphalt 23 

Cube  Molds  for  Cement 132 

Cubic  Foot  Gas  Bottles 2P2 

Cubic    Inch    Box 252 

Culture     Apparatus,     Anaero- 
bic          11 

Culture   Dishes    181 

Culture  Dish  Holders 181 

Culture    Flasks    182 

Culture    Jars    11 

Culture    Slides     -349 

Culture  Tubes    487,   488 

Culture  Tube.  Keldel  Vacuum 

for  Blood    84 

Culture   Tube   Baskets 481 

Cups.    Annealing     IS 

Cup,    Blickfan's    Wet 81 

Cups,  Embryological   18! 

Cups,    Porcelain     25! 

Cups     or     Cells,     Porous     for 

Batteries    66,6! 

Cups,  Swimming 484 

Cup.   Water   Retention 46( 

Cupels     182 

Cupels,    Bone   Ash    182 

Cupels.   Caslte    18! 

Cupel  Holders 94.   182 

Cupel    Machines    182 

Cupel   Molds    182 

Cupel    Rake    182 

Cupel    Shovel    182 

Cupel   Tongs    503 

Cupel  Tray   182 

Current   Rectifiers    217-219 

Current    Slide.    Holman 349 

Cut-off   Clamps    147 

Cut-out  Plug    227 

Cutter.    Bagasse    179 

Cutters,  Glass,  All  Kinds. 295,  296 

Cutters.    Glass    Disk 295 

Cutters,  Glass  Tubing 295.   296 

Butter.   Potato   414 

Cyanide  Bottles  for  Insects..   100 


Page 

vlinders.    All   Kinds 124. 

153,    183,    237,    238,    252.    274,  275 
ylinders.   Ammonia   Test....   153 

'ylinders.   Baking    252 

Cylinders,    Calcium    Chloride.    124 

Cylinders,   Filter    237,  238 

Cylinders,   Gas,   for  CO*  OTV- 

gen.   etc 274.  275 

ylinders,  Glass   183 

Cylinders.     Graduated     Preci- 
sion         183 

'ylinders,   Hehner*s    153  i 

Cvlinders,   Hvdrometer    183  i 

vlinders.    Mixing    183 

vlinders,   Mixing.   Precision.    183 
vlinders   for   Moisture   Test- 
ers        183 

Cvlinders,  Porous   Filtering.. 

237.  238 

Cylinders  for  Nessler  Ammo- 
nia Test   153 

vllnders.  Steel  for  Gases. 274.   275 

Cylinder  Brushes 108.   109 

^vlinder   Tongs    255.   503 

r-vlindrlcal   Graduates    183 

Cylindrical    Shelf    for    Pneu- 
matic   Troughs    506 

n 

D '  Arsonval       Galvanometers 

and    Accessories    205-207 

Dairy  Cattle  Score  Cards....    363 

Dairy  Thermometers    364 

Daland   Haematokrlt    134 

Dam,   Rubber   421 

Dangler's    Gasoline    Burner.  .    122 

Dangler  Lamps   122 

Danlell's   Battery    66 

Dark   Field   Condensers 344 

Dasey   Churns    358 

Davy   Safety   Lamp 332 

Day  Spring  Pinch  Cock 147 

Daylight    Lamps    ....155.   345-347 
Decade     Dial     Resistance 

Boxes    221 

Decalescent   Outfit 410 

Decimal  Balances 47 

Decimal    Stop    Watches.  .  .473-47J 

Decimeter    Rules    435 

Decomposition   of  Water  Ap- 
paratus       332 

Deflagration    Globes    184 

Deflagrallon   Spoons    184 

Dehydrating     Apparatus     for 

Tar  and  Creosote  Oils t* 

DeKhotlnsky   Cement    130 

DeKhotlnsky  Cremator,  Elec- 
tric        169 

DeKhotinsky  Drying  Ovens.  . 

383-385 

DeKhotlnsky   Hot   Air   Steril- 
izers         466 

DeKhotlnsky    Immersion 

Heaters     307 

DeKhotlnsky  Incubators.  Tri- 
ple  Wall    318-319 

DeKhotlnsky  Laboratory  Ce- 
ment        130 

DeKhotlnsky   Staining   Appa- 
ratus        464 

DeKhotlnsky     Thermo-Ree-u- 

lators     383.   500 

DeKhotlnsky    The  r  m  o  s  t  a  t 

Baths    401-403 

DeKhotlnsky    Tube    or    Bomb 

Furnace    270 

DeKhotlnsky    Water    Baths.. 

515.   516.   S18 

Delivery   Bulb   Tube 371 

Demonstration  Ammeter   ....    213 

Demonstration    Balance    

Demonstration    Galvanometer  213 
Demonstration     Lecture     Ar>- 

paratus    332,   3 

Demonstration     Microscope...   3 
Demonstration    Thermometer.   49fi 
Demonstration  Voltmeter    ...   213 

Dennlson   Labels    329.   33C 

Dental   Dam    429 

Denver  Fire  Clay  Crucibles.. 

17».  171 

Denver  Fire  Clav  Muffles....    367 
Denver    Fire    Clay    Roasting 

Dishes    

Denver  Fire  Clav  Scorlflers..    43f 

Depth  Cutling  Saw    434 

Depth    Gage.    Automatic 3<M 

Desiccators     184.1 

Desiccator    Cabinets    1 

Desiccator  Dishes 1 

Desiccator  Plates   185 


Page 

Despatch  Electric  Baking  Ov- 
ens     381 

Despatch  Electric  Drying  Ov- 
ens     385.   386 

Despatch      Electric     Proofing 

Cabinets     254 

Detroit  Burner   118 

Dewar   Vacuum    Flasks 510 

Diagnostic  Microtomes.  .  .351.  352 
Dial  Decade  Resistance 

Boxes   221 

Dialyzers    .'   135 

Dlalyzer  Parchment  Paper.  .  185 
Dialyzing  Method.  Abderhal- 

den  Reagents  for 82 

Dialyzing    Thimbles    401 

Diameter   Measuring   Tape...    487 

Diamond,   Writing    135 

Diamond  for  Cutting  Glass..    295 

Diamond   Glass   Cutter 295 

Diamond  Ink    igs 

Diamond    Mortars    366 

Die,  Screw  and  Tap  Sets.  .      .    437 

Dies.    Steel    \gf 

Dieffenbach   Forceps    189 

Differential  Gage   (Pilot  Tube)  272 

Differential   Manometer    272 

Differential  Thermometers...  493 
Digesters  or  Autoclaves.  .  .27.  28 
Digestion  Apparatus  .... 

27.   28,    369-371 

Digestion  Beaker 475 

Digestion  Shelves.  Kjeldahl.. 

369-371 

Dipper,    Acid 35« 

Dipping  Battery   69 

Dipping    Electrodes     397 

Direct  Current  Motors. ..  .214-216 

Discharge  Chamber 424 

Dishes,    All    Kinds 

20,   181.   185-188.   238.   409 

Dishes,   Aluminum    187 

Dishes,  Alundum  for  Inciner- 
ations        i«2 

Dishes,    Crvstallizing    186 

Dishes,  Cultuce   181 

Dishes.   Desiccator   185 

Dishes.    Fnamel    Ware 187 

Dishes,  Evaporating.  Gliss..  186 
Dishes.  Evaporating,  Nickel, 

for   Tar  Testing    20 

Dishes,     Evaporating,    Porce- 

l*in     T86 

Dishes.  Evaporating,  Ouartz  187 
Dishes.  Fvaporating.  Silica..  186 
Dishes.  Filtering,  Alundum..  238 

Dishes,   Graniteware    187 

Dishes,      Incinerating,      Alun- 
dum        162 

Dishes,   Iron    433 

Dishes,  Lead 187 

Dishes.   Milk,   of  Aluminum..    187 

Dishes,   Moisture    187 

Dishes.  Nickel    187 

Dishes,    Petrl    181 

Dishes,    Platinum    40» 

Dishes,   Preparation    188 

Dishes,  Roasting 188 

Dishes,    Silica    186.  188 

Dishes.    Silver    188 

Dishes,  Sputum    463 

Dishes,   Staining    188,   328.   512 

Dishes,    Steel    433 

Dishes,  Slender   188 

Dishes,    Sugar    188 

Dishes,   Tannin    188 

Dishes,  Tin   Foil    187 

Dishes,  Transparent  Quartz.  .    187 

Dishes,   "Weighing    61.   62 

Dish    Clamps    147 

Dish  Covers  for  Petri  Dishes. 

Porous   Clay   181 

Dish  Holders  for  Petrl  Dishes  1«1 

Disks,  Absorbent  Cotton R63 

Disks,    Bolting    Cloth 520 

Disks,  Porcelain.  Caldwell... 

172.   238 

Disks.   Porcelain    Filter 2SS 

Disks,    Pulverizing    181 

Disks,  Rubber  for  Foot  Blow- 
ers          88 

Dispensing  Balances 

42,   43,   47,   51.   54 

Dispensing  Burettes    112 

Dispensing  Scales.42,  43,  47.  51,  54 

Dissecting    Gowns    14 

Dissecting  Instruments. .  .189-194 
Dissecting  Instrument  Cases.  193 

Dissecting   Microscopes    

334.    335,    341.   342 


536 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Page 

Dissecting  Needles 190 

Dissecting  Pans    190 

Dissecting   Scalpels    190.  191 

Dissecting  Scissors    192 

Dissolving  Tube,   Freas 196 

Distillation   Flasks    246.  247 

Distillation  Thermometers  . .  496 
Distilled  Water  Storage  Tank  329 
Distilling  Apparatus.  .20.  21. 

196-200,  204,  369,  370,  374,  427 
Distilling  Apparatus,  Hortvet  199 
Distilling  Apparatus,  K1el- 

dahl     369.   370 

Distilling      Apparatus,      Mer- 
cury,   Hulett's    199 

Distilling  Apparatus  for  Min- 
eral Oils  and  Tars 

20,    21,   198.   199,   374 

Distilling  Apparatus.  Vacuum  426 
Distilling  Flasks,  All  Kinds.  . 

246-248 

Distilling  Shelves,  Kjeldahl.. 

369.   370 

Distilling:  Tubes,  All  Kinds.. 

199-200,  371 

Distilling  Tube,   Glinsky 200 

Distilling  Tube,   Hempel 200 

Distilling   Tubes,    Hopkins...    371 

Distilling    Tube,    Knight 200 

Distilling    Tube,    LeBel    Hen- 

ninger    200 

Distilling   Tube.    Wurtz 200 

Distilling   Tube,   Young 200 

Distributing    Box    for    Micro- 
scope  Lamps    347 

Distributors  for  Gas 287 

Dividers,  All  Kinds.. 200.  201,  358 
Dixon's  Plumbago  Crucibles.  172 

Dixon's   Sand   Crucibles 173 

Dockage    Sieves,   Wheat.. 302.   442 

Dodge   Rheostats    226 

Doremus   Gas   Collector 286 

Doremus   TIreometers    509 

Doremus-Hinds  TTreometers .  .  609 
Double  Automatic  Pipettes..  404 

Double   Boilers    329 

Double  Dishes   181 

Double-End  Planes    406 

Double    Meter    Sticks 435 

Double  Walled  Funnels 258 

Double  Walled   Incubators...    324 

Double  Walled  Ovens 386-388 

Doublet  Magnifiers    334 

Dough    Expansion    Jars 252 

Dough   Mixing   Knife 253 

Dough  Testing  Thermometer. 

.- 255,   494 

Dovetail  Saw   434 

Draft  Gages   272 

Drainage  Apparatus  for  Soils 

448.  457 

Draw  Knives   203 

Draw  Plate 203 

Drawing  Boards    201 

Drawing  Ink   201 

Drawing  Instruments    ....201-203 

Drawing  Paper   202 

Drawing  Pencils   202 

Drawing   Scale,    Triangular..    203 

Drawing  Triangles   203 

Drawing  T-Squares   203 

Dressing  Forceps   189 

Dressing  Jars 327 

Dressing   Sterilizer?    ...26-29,  465 

Dressing   for   Strops 355 

Drills    203,   204 

Drill  Gage 204 

Drill  Points   203.   204 

Drivers,    Screw    437 

Driving  Heads   459 

Drops,   Prince  Rupert 432 

Drop  Culture  Slides 349 

Droppers,   Medicine    404 

Dropping  Bottles    99 

Dropping   Funnels    258,  269 

Dropping   Pipettes    404.   509 

Drucker       Calomel        Normal 

Electrodes   397 

Drucker  Viscosity  Tubes....  403 
Drucker  Viscosity  Pipette...  403 

Drug   Mills    177-180 

Dry   Batteries    67 

Dry   Measures,    Wood 336 

Dryer.        Chloride        Calcium 

Holder  for  Balances 61 

Drying  Apparatus.  Bennert's  204 
Drying  Apparatus,  Tauber's. .  204 

Drying    Bulbs    

..124,  160,  161,  204.  413.  414,   424 
Drying  Closets,  Glass 185 


Page 

Drying    Jars,    Calcium    Chlo- 
ride     124,   160.  161 

Drying     Ovens     for     Asphalt 

Testing    21.  387 

Drying  Ovens,  Constant  Tem- 
perature     383-388 

Drying  Paper.  Botanical ....  95.   96 
Drying  Tables,  or  Hot  Plates 

308-310 

Drying   Tubes    

..124,  160,  161,  204,  413.  414.  424 
Drying  Tubes,   Calcium  Chlo- 
ride     124,  160,  161 

Drying  Tube  and  Potash  Bulb 

Combined,   Vernier    9,  161 

Duboscq   Colorimeter    164 

Ductility   Machine,    Asphalt.  .  21 

Ductility  Machine,  Smith's...  21 

Ductility  Machine  Mold 23 

Dudley's   Sulphur   Apparatus.  476 

Dulln  Rotarex    19 

Dumas  Vapor   Density  Appa- 
ratus      63,  510 

Dumas  Vapor  Density  Bulbs. 

63.  510 

Dunham's   Gas   Regulator....  501 

Dunning  Colorimeter    156 

Duplex  Slide  Rule 444 

Du   Pont  Nitrometer 371 

Dust    Determination    Appara- 
tus  10,   285.  287 

Dust  Filters 10,  285,  287.  501 

Dusting  Brushes    108.  109 

Dutch  Leaf   256 

Duvel  Moisture  Apparatus...  301 
Dwlght's  Gas  Analysis  Appa- 
ratus      278 

Dye  Pots    78 

Dynamos,    Electric    207.  208 


Earth    Thermometer    499 

Earthenware    Covers    for   Pe- 

tri   Dishes    181 

Earthenware   Guard  for  Burn- 
ers    123 

Earthenware   Jars    329 

Kbnlllometer.   Salleron    204 

Eclipse    Autoclaves    26 

Edgerton  Standard  Screen...  292 
Edison  Primary  Batteries...  67 
Edwards  Gas  Density  Balance  286 
Epgertz  Carbon  Comparison 

Tubes    153 

Egerertz      Color      Comparison 

Tubes    153 

Elnhorn     Fermentation     Sac- 

charometer     509 

Elector.   Gas    285 

Electrical      Instruments.      All 

Kinds     205-229.    403.   455 

Electric    Arc    Lamps    for    Mi- 
croscopes        346 

Electric  Baking  Ovens... 381,  382 
Electric  Baths.  .  .514-516,  518.  519 

Electric  Batteries 66-74 

Electric   Battery   Connectors.      76 

Electric    Bells    80 

Electric  Binding  Posts 76 

Electric   Blowers,   Hot   Air...      88 

Electric  Centrifuges 

135-140.    142.    374.    446 

Electric  Charger  for   Storage 

Batteries     71.  313 

Electric  Combustion  Furnaces 

160,   161,   260,   261 

Electric  Combustion  Trains.. 

160.   161 

Electric      Cremator,      DeKho- 

tinsky   169 

Electric  Current  Rectifiers..  219 
Electric  Distilling  Apparatus  196 

Electric  Dry  Cells 67 

Electric  Drying  Oven 383-386 

Electric  Dynamos    207.   208 

Electric    Extraction    Appara- 
tus     19,   233,   234 

Electric   Flask   Heaters 

233.    234,    306.   615 

Electric   Furnaces,   Hosklns.. 

260,   263.   266 

Electric   Generators    207.   208 

Electric      Heater      for      Milk 

Testers    360 

Electric    Heating    Device    for 

Incubators    321.  322 

Electric  Hot  Air  Blast 88 

Electric  Hot  Plates 308-310 

Electric  Incubators    318-325 

Electric    Instrument    Steriliz- 
ers     ; :465-466  i 


Page 

Electric    Loop     Flaming    De- 
vice        169 

Electric    Machines    205-229 

Electric  Meters    209-213 

Electric  Milk  Testers 359-361 

Electric  Motors    214-216 

Electric   Motor  Generators... 

217.  218 

Electric   Ovens    381-388.   390 

Electric  Ozonators   389 

Electric  Paraffine  Ovens.  .393-395 
Electric  Polishing  Heads....  413 
Electric  Proofing  Cabinets...  254 

Electric    Pyrometers    417-423 

Electric   Resistances    220-226 

Electric   Rotators    229.  470 

Electric  Shaking  Apparatus.. 

438-440 

Electric  Sieve  Shakers.  .  .442.  443 
Electric  Soldering  Coppers..  460 
Electric  Staining  Apparatus.  464 

Electric   Stirrers   470 

Electric   Stop-Watches 473.   474 

Electric   Storage   Batteries.  .70-73 

Electric  Switches   228,  229 

Electric   Testing  Set 223 

Electric  Thermo-Regulators.  500 
Electric  Thermostatic  Baths. 

401,  403 

Electric   Time   Marker 501 

Electric  Transformers   ...226.   227 

Electric  Tube  Furnaces 270 

Electric  Warm   Stage 350 

Electric  Water  Baths 

514-516,   518.   619 

Electric  Water  Stills 196.   197 

Electro-Analysis  Apparatus..  229 
Electro-Chemistry  Apparatus 

229,   396-399,   403 

Electrodes,  Calomel  Normal..    397 

Electrodes,    Dipping    397 

Electrodes,  Gas   398 

Electrodes,   Immersion    397 

Electrodes,     Metal     for     Half 

Elements    399 

Electrode,   Pipette    397 

Electrodes.  Platinum. 398,  399.  410 
Electrode  Cells,  Ostwald.  .396-398 

Electrode   Rotator    229 

Electrode  Support 397,   398 

Electrode    Tube,    Capillary... 

398.   399 

Electrolyte    for    Edison    Bat- 
teries           73 

Electrolytic    Apparatus    

229,   332,    333 

Electrolytic    Outfit,    Braun...   229 

Electrolytic   Rectifiers    219 

Electrolytic  Stirring  Appara- 
tus     229.  470 

Electrolytic  Supports    229 

Electromagnets    205 

Electrometers,    Capillary .398.   399 
Electroscope   for  Radio-Chem- 
istry     423-425 

Electro   -  Silica      Combustion 

Tubes    163 

Electro-Silica   Crucibles    174 

Elements.     Charts     of.     with 

their   Atomic   Weights 144 

Elements,    Half,    for   Physical 

Chemistry    399 

Elements.  Normal   397 

Elliott  Flash  and  Fire  Tester  375 

Elliott   Gas   Apparatus 281 

Elliott   Oil   Tester 375 

Eluriating   Apparatus    ...247,   449 

Eluriating  Flasks    247,   449 

Emanation  Chamber    424 

Emanation  Electroscope.  .423-425 
Embedding  Baths,  Paraffine. 

392,   393 

Embedding   Box    364 

Embedding  Ovens,  Paraffine. 

393-395 

Embryologlcal   Cup    188 

Embryological  Watch  Glasses   188 

Emergency  Kit   243 

Emerson  Razor  Strop 355 

Emery   Cloth    230 

Emery  Paper    230 

Emery  Paper  Grinder 3 

Emery  Paper.   Metallographic  337 

Emery  Wheels    368,   412 

Kmmerling's  Absorption  Tube        8 

Enameled    Pails.   White 390 

Enameled  Wire.  Copper 521 

Enamelware    Dishes. 187,    253.   300 

Enamelware   Funnels    257 

Enamelware  Waste  Pail 390 


CENTRAL.  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


537 


Page 

Engler  Distillation   Flasks...  246 

Engler    Viscosimeters    379 

English   and   Metric   Rules...  432 

Engravers'   Glasses    334 

Enterprise   Grinding   Mill....  179 
Epstein's     Micro-Saccharime- 

ter    86 

Erlenmeyer   Flasks    245 

Esbach   Albuminometers    ....  608 

Ether  Bottles   106 

Ether  Distillation  Flask  Heat- 
ers  233,   234.    305,    308.  515 

Ether  Freezing  Attachment.  .  354 

Ether  Hydrometer   313 

Ether       Separatory        Funnel 

Tubes    258 

Ether  Washing  Bottles 106 

Eudiometers    230 

Eudiometers,   Lecture 332.  333 

Evaporating  Burners    116 

Evaporating  Dishes,  Glass...  186 
Evaporating  Dishes.   Nickel.. 

20.  187 

Evaporating     Dishes.     Nickel. 

for   Tar   Testing 20 

Evaporating      Dishes,      Plati- 
num     409 

Evaporating     Dishes,     Porce- 
lain      186 

Evaporating  Dishes,  Silica.  .  .  186 
Evaporating     Dishes.     Trans- 
parent Quartz    187 

Evaporator,    Brown's   for  As- 

phaltic  Petroleums 22 

Evaporators,   Steam    513.  514 

Evaporimeters   449 

Expander.    Bulb    431 

Expansion    Jar,   Chidlow 252 

Expansion  Pyrometers 417 

Explosion  Furnace,  Carius...  270 
Explosion     Pipettes     for    Gas 

Analysis    293.  294 

Extension    Clamps    149 

Extra  Rapid  Filter  Paper.  .  .  .  240 

Extraction    Apparatus    

19,    22,   230-234,    247.  358 

Extraction  Apparatus  for  As- 
phalt      22 

Extraction     Apparatus.     Bai- 
ley-Walker       230 

Extraction     Apparatus.     Bar- 

rett-Cottle    22 

Extraction    Apparatus,   Knorr 

230.  231 

Extraction  Apparatus.   Reed's  231 
Extraction    Apparatus.    Rich- 
ardson      232 

Extraction       Apparatus       for 

Rubber   231 

Extraction     Apparatus.     Sox- 

hlet's    231 

Extraction  Apparatus.  Teas..  232 
Extraction  Apparatus.  Under- 
writers'       232 

Extraction     Apparatus,     Wi- 
ley's    232 

Extraction      Apparatus.      Wi- 
ley-Richardson      232 

Extraction    Apparatus    Heat- 
ers     233,   234,  308 

Extraction     Cartridges.  .  .232.  233 

Extraction  Flasks 230-232.  247 

Extraction  Paper,  Fat  Free.. 

241.  361 

Extraction   Siphons    230-232 

Extraction  Thimbles.  Shells.  . 

232.  233 

Extraction   Tubes    230-233 

Extraction   Tube,   Roehrig's.. 

033  258 
Extractor       for       Bituminous 

Mixtures    19.   22 

Extractor       for       Bituminous 

Mixtures,   Dulin  Rotarex...  19 

Extractors,  Cork    167.   168 

Eyes.   Screw    437 

Eye   Glasses    298 

Eye   Protectors    298 

Eyepieces  for  Microscopes...  344 
Eyepiece  Micrometers    ...347.   520 

Ezy   Edge   Hone 354 


Factor   Weights    57 

Fahrenheit   Scale  Thermome- 
ters    490-499 

Farrington's   Acid   Burette...    356 

Farrington's  Tablets 357 

Fat  Determination  Apparatus 

230-234.   358 

Fat  Extracted  Paper 241.   361 


Page 
Fat    Extraction    Tube.    Roeh- 

rig    233.   358 

Fat  Free  Paper 241,  361 

Fat   Free   Thimbles 233 

Fatty    Acid    Flasks 250 

Faucet    Connections    for    Fil- 
ter I'umps   242 

Faucet  Connections   for  Rub- 
ber Tubing   308 

Feeders,    Acid    for    Flotation 

Machine    251 

Feeders,      Oil     for     Flotation 

Machine     ..„ 251 

Fehling's   Solution    608 

Felt   Filters    237 

Felt  Polishing  Wheel 412 

Fermentation  Saccharometer  509 
Fermentation  Tubes  ....234.  236 
Fermentation  Tube  Support. . 

235.  478 

Ferrotype   Plate    525 

Fiber  Blocks.   Red 354 

Fiber  Rods    625 

Fiber  Sheet 526 

Fiber  Tubing   526 

Figures  of  Steel  for  Stamping 

186.   463 

File  Handles   236 

Fillers.  Grain  Tester 301 

Filling    Attachment    for    Bu- 
rettes        113 

Filling    Attachment    for    Test 

Tubes   488 

Filters.   Berkefeld    235 

Filters,  Gas    287 

Filters,     Pasteur   -   Chamber- 
land    237 

Filters,  Pukal   237 

Filters.   Serum    235-237 

Filters,  Soil   236.  237 

Filters,  Water 235 

Filter   Apparatus    235-238 

Filter  Bags 237 

Filter    Boats.    Platinum 408 

Filter  Bougies 237 

Filter  Cartridges 232.   233 

Filter  Cones,  Alundum 237 

Filter   Cones.    Platinum 408 

Filter   Cones.   Porcelain 238 

Filter    Crucibles 170,   171,  408 

Filter  Cylinders 235.   238 

Filter  Dishes.  Alundum 238 

Filter   Disks   238 

Filter  Flasks   247 

Filter   Funnels    257,  258 

Filter  Paper   238-241 

Filter  Paper  for  Agar 238 

Filter  Paper  Boxes 241 

Filter   Paper   Case 241 

Filter    Plates,    Porcelain 238 

Filter   Presses    242 

Filter   Pumps    242.  243 

Filter   Pumps    for    Both    Suc- 
tion  and   Pressure 243 

Filter   Pump   Couplings 242 

Filter   Racks    243 

Filter   Stands    478.   479 

Filter  Thimbles    232.  233 

Filter  Tubes.235.  236,  237,  238,  287 

Filter  Tube  for  Gases 287 

Filtering   Apparatus    

20,  170,  172,  173,  235-238.  287.  408 
Filtering  Crucibles.  Alundum  170 
Filtering  Crucibles,  Platinum  408 
Filtering  Crucibles.  Porcelain 

20.   172,   173 

Filtering   Crucibles.    Silica...   174 
Filtering      Crucibles.      Trans- 
parent  Quartz    173 

Filtering    Dishes,    Alundum..    238 

Filtering    Tray    237 

Findlay   Migration   Tubes 399 

Findlay  Surface  Tension   Ap- 
paratus     401 

Fine  Grinder  for  Specimens..  338 
Fineness  Scale  for  Cement...  46 

Finger  Cots,   Rubber 243 

Fires,  Glass   Blowers' 117 

Fire   Clay   Crucibles 170.  171 

Fire  Proof  Cement 17.   130 

Fire  Testers    375,   376,   379 

First    Aid    Cabinet 243 

Fischer  Sulphurous  Acid  Con- 
denser        166 

Fish    Line    165 

Fish  Tail  Burner  Tip 123 

Fittings  for  Wash  Bottles...    106 
Fitzgerald    Filter   Apparatus.    237 
Flaherty's    Carboy    Inclinator  129 
Flash    and    Fire    Test    Ther- 
mometers     496.   497 


Page 

Flash    Lamp,    Pocket 331 

Flash   Point   Testers.. 22,  375.   376 

Flasks  All  Kinds 22. 

105,    106,    182,    230-232.    244- 
250,    287.    449.    456,    475,    476,    610 

Flasks,   Acetylization    246 

Flasks,  Assay   246.  248 

Flasks,    Bacteriological    182 

Flasks,    Balloon    2  45 

Flasks,  Bates   250 

Flasks,    Boiling    244.  245 

Flask.    Carbon    Residue 247 

Flasks,   Carbonic   Acid 247 

Flasks,  Cassia   246 

Flasks,   Claissen    246 

Flasks,  Copper 246.  248 

Flasks  for  Copper  Determina- 
tions       248 

Flasks  for  Copper  Oxide 246 

Flasks,  Culture 182 

Flasks,   Distillation    246-248 

Flasks,   Eluriating   247,  449 

Flasks,    Engler   Distillation..   246 

Flasks,   Erlenmeyer    245 

Flasks,  Extraction 

22,   230-232.   247 

Flasks,   Filtering    247 

Flasks,  Foot 250 

Flasks,  Freudenreich  Culture  182 
Flasks,  Fused  Silica. 246,   247.  249 

Flasks,  Generating   287 

Flasks,  Gile's   250 

Flasks,  Hempel  for  Creosote.   246 

Flasks,   Inversion    475 

Flasks,  for  Iodine  Determina- 
tions        248 

Flask,    Johnson's    249 

Flasks,  Joliet   248 

Flasks,  Kjeldahl 248 

Flasks,  Kohlrausch   250 

Flasks.  Kolle   182 

Flasks,    Ladenburg   Distilling  247 

Flasks,  Lunge  Tar 247 

Flasks,   Melting   Point 248 

Flasks.   Miquel   Culture 182 

Flasks.    Moisture   Test 248 

Flasks.    Nitrogen    248 

Flasks,  Oxygen   248 

Flasks,  Phosphorus   248 

Flasks,   Precipitating    327 

Flasks,  Pyrex  Glass 244-249 

Flasks.    Silica    246,  247.  249 

Flasks,  Soil  Analysis.247,  249.   449 

Flasks.   Soxhlet    231.  247 

Flasks,  Sugar 250.  475 

Flasks,     Sulphur     Determina- 
tion       249 

Flasks,  Transparent  Quartz..   249 

Flasks,  Vacuum    510 

Flasks,   Volumetric 249.  250 

Flasks,  Volumetric  Precision.    250 
Flasks  for  Wash  Bottles.  106.  244 

Flask  Clamp 147 

Flask   Heaters    250.   616 

Flask  Heater  with  Hot  Plate  306 

Flask   Supports    168,  477.  478 

Flax  Cord    165 

Fleming  Absorption  Bulb....        8 

Fletcher's  Blast  Lamp 120 

Fletcher's  Blowers    (Bellows)      88 

Fletcher's   Blowpipe    93 

I  Fletcher's      Blowpipe,      Com- 
pound     120 

Fletcher's  Bunsen  Burner. . . .    116 

!  Fletcher's  Burners 116 

Fletcher's    Combustion     Fur- 
nace        262 

t  Fletcher's   Crucible   Furnaces 

264.  265 

'Fletcher's   Muffle    Furnace...    265 
!  Fletcher's   Radial    Burner....    116 
Fletcher's  Solid  Flame  Burn- 
er        116 

Fletcher's  Water  Heaters.307.   308 
!  Flexible     Brass     Tubing     for 

Burner  Connections 117 

Flexible  Metallic  Tubing 431 

Flexible   Steel   Spatulas 461 

Florence   Flasks    244 

Flotation    Machine.    Braun...    251 

Flour   Ashing   Capsules 129 

Flour   Testing   Apparatus. 252-255 

•-  Flour  Testing  Cylinder 252 

Flow  Plate  and  Mold,  Asphalt     22 

;  Flue  Gas  Apparatus 276-281 

'Fluted  Funnels   257 

.  Foil.  Aluminum  Leaf 256 

I  Foil,    Dutch    Leaf... 256 

Foil.  Gold  Leaf 266 

Foil,  Platinum   410 

Foil,  Silver   94 


538 


CENTKAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Page 

Folded    Filters,   Green's 238 

Folding-   Rules    432 

Folin's    Ammonia    Absorption 

Apparatus     11,  508 

Folin's    New    Methods,    Appa- 
ratus for 508.   509 

Folin's    Nitrogen    Determina- 
tion   Apparatus    508,   509 

Folin's  Tubes 11,   87,    508 

Folin's    Tube    for    Marshall's 

Urea  in   Blood  Apparatus.  .      87 
Folin's    Urea   Apparatus.  .508.   509 

Foot  Blowers   88 

Foot  Flask    250 

Forceps 62,   94,   189,   256 

Forceps,    Artery    189 

Forceps,   Blowpiping    94,   256 

Forceps,  Bone  Cutting- 189 

Forceps,   Bottle    256 

Forceps,   Cover   Glass    256 

Forceps,  Dissecting   189 

Forceps,    Dressing    189 

Forceps,   Pinning    256 

Forceps,    Platinum    Tipped...    256 

Forceps,   Slide    256 

Foster  Flash  and  Fire  Tester  375 

Foster  Oil  Tester 375 

Fork  for  Burners 123 

Fortin   Barometers    64.   65 

Four-Line    Wantage    Rod....    380 

Four-Way  Stop-Cocks 287.   471 

Fraction  Weights   56-69 

Fractional  Distillation   Appa- 
ratus. 199,  200,  246,  247,  374.   378 
Fractional  Distillation  Flasks 

246.  247 

Fractional   Distillation   Tubes 

199.   200 

Fractionating  Apparatus  .... 

199,   200,    374,   378 

Franklin's      Pulse      or      Palm 

Glass   414 

Freas   Dissolving   Tube 195 

Freas  Gas  Generator 287 

Fredericia  Apparatus  for  CO2 

in  Alveolar  Air 82 

Freezer,    Tagliabue    Oil 377 

Freezing  Attachments  for  Mi- 
crotomes        354 

Freezing-   Point   Apparatus...    400 
Freezing  Tubes  for  Molecular 
Weight   Determination    Ap- 
paratus         400 

Fresenius   Arsenic   Apparatus     16 

Fresenius   Burettes    Ill 

Fresenius  Burette  Stop-Cocks  472 

Fresenius   Nitrogen    Bulb 371 

Freudenreich   Culture    Flask.    182 

Frost  Counting  Plate 169 

Frost  Gasometer  Chart 236 

Fruit  Jars,   Mason 328 

Fruit  Jars,   Sure  Seal 328 

Fuchs  -  Rosenthal     Counting 

Apparatus    84 

Fuel   Calorimeters    126-128 

Fuller  Battery    68 

Fume  Absorption  Tube,  Folin   508 
Fumeless    Digestion    Appara- 
tus        370 

Funnels 113,   257-259.  520 

Funnels,  Alundum    237 

Funnels,   Agateware    257 

Funnels,   Bunsen    257 

Funnels,    for    Burettes 113 

Funnels,   Copper   258 

Funnels,  Creosote    257.  259 

Funnels.   Double   Walled 258 

Funnels,  Enamelware 257 

Funnels,  Hard  Rubber 258 

Funnels,   Hot  Water 258 

Funnels,    Lactic    Acid 259 

Funnels,    Porcelain    258 

Funnels,    Ribbed    257 

Funnels,  Rubber 258 

Funnels,    Sedgewick-Rafter.  .    520 

Funnels,  Separatory    

20,   258.259.   271 

Funnels,  Separatory  for  Creo- 
sote     20.   259 

Funnel,  Separatory  for  Fusel 

Oil 271 

Funnel,    Separatory    for   Wa- 
ter In  Tar 20 

Funnels,    Shaking    259 

Funnel,  Steam   258 

Funnels,   Stemless    257 

Funnel   Attachment   for   Fill- 
Ing  Test  Tubes 488 

Funnel  Brushes   109 

Funnel  Flasks  for  Filtering-..    247 
Funnel  Plates,  Porcelain 238 


Page 

Funnel    Supports    478,  479 

Funnel    Tubes    259 

Furnaces.   All   Kinds 260-271 

Furnaces,  Combustion,  Fletch- 
er       262 

Furnaces,     Combustion,     Gla- 

ser    262 

Furnaces,     Combustion,    Hos- 

kins    260 

Furnaces,     Combustion,    Mul- 
tiple Unit  Electric 261 

Furnaces,   Crucible,    Braun...  264 
Furnaces,        Crucible,        Case 

Melting     ; 264 

Furnaces,   Crucible,   Hoskins.  263 

Furnaces,   Electric    

..260,  261,  263,  266,  267,  270,  271 
Furnaces,       Electric,       High- 
Temp 271 

Furnaces  for  Elementary  Or- 
ganic Analysis    261 

Furnace,    Explosion,   Carius..  270 
Furnace,    Explosion,    DeKho- 

tinsky   270 

Furnaces,   Gas    

..116,  262,  264,  265,  268,  269,  270 

Furnaces,    Gasoline    

264,  265,  268,  269 

Furnaces,    High    Temperature  271 

Furnaces,  Kerosene 266 

Furnaces,    Muffle    266-269 

Furnaces,    Muffle,    Cary 269 

Furnaces,  Muffle,   Fletcher...  265 
Furnaces,   Muffle,   Hoskins... 

263,  266 

Furnaces,      Muffle,      .Multiple 

Unit   Electric    267 

Furnace,   Muffle,   Wiesnegg.  ..  269 
Furnace,   Tube   or   Bomb,   Ca- 
rius      270 

Furnace,    Tube    or   Bomb,    De 

Khotinsky   270 

Furnace  Rheostats.  .  .260,  263,  266 
Fusel    Oil    Apparatus,    Brom- 

well   271 

Fuses  for  Drying  Ovens.. 384,  385 

Fuse  Plugs    227 

Fuse  Plug  Cut-Out 227 

Fuse  Wire   522 

Fused   Rock   Crystal   Appara- 
tus      78, 

162,    163,    173.    187,    249,    428.  488 

Fused  Silica   Beakers 78 

Fused   Silica    Boats 162 

Fused    Silica    Capsules 162 

Fused  Silica  Casseroles 130 

Fused        Silica        Combustion 

Tubes    163 

Fused    Silica    Crucibles 174 

Fused  Silica  Dishes 186.  188 

Fused    Silica    Flasks 246-248 

Fused   Silica  Muffles 367 

Fused   Silica   Rods 443 

Fused  Silica  Triangles 505 

Fused   Silica  Tubing 163.  443 

Fusion   Temperature   Furnace  271 


Gages,   All   Kinds 

63-65,    87,    168,    204, 

272-275,    285,    304,    391,    392,    449 

Gage,  Automatic   Depth 304 

Gage,   Cork    168 

Gage,   Cover  Glass 391 

Gage,    Differential    272 

Gages,  Draft,  U-Tube 272 

Gage,   Drill    204 

Gage,  Evaporating 449 

Gage,  Glass  Tubing 272 

Gage,  Marking    272 

Gages,    Paper    Testing.  ..  .391,    392 

Gage.   Pitot   272 

Gages,  Pressure. 272,   273,  274,   275 

Gages,    Rain    273 

Gage,  Screw  Pitch 273 

Gage,   Thorp   285 

Gage,    Tube 272,   273 

Gage,    Vacuum,    McLeod's....    273 
Gage,    Vacuum,    Standard....   273 

Gages,    Water    387 

Gages,   Wire   274 

Gage  Rods    377 

Gage   Tables   for  Wire 527 

Galvanic  Batteries    66-74 

Galvanized   Waste   Can 612 

Galvanometers    and    Accesso- 
ries     205-207.    213 

Galvanometer,  Demonstration  213 

Galvanometer   Mirrors    207 

Galvanometer   Repairs    207 


Page 

Galvanometer  Suspensions...    207 
G  a  1  v  a  n  o  meter    Suspension 

Ribbon    207 

Galvano-Volt-Ammeter     213 

Gamma    Ray    Electroscopes..    425 

Gang  Molds   131.   132 

Ganong       Plant       Physiology 

Apparatus     299.   407 

Gases,   All  Kinds 274.   275 

Gas,  Ammonia   274 

Gas,   Carbonic   Acid 274 

Gas,    Chlorine    274 

Gas,    Hydrogen    274 

Gas,    Nitrogen    275 

Gas,    Nitrous    Oxide 275 

Gas,  Oxygen   275 

Gas,   Sulphur   Dioxide 275 

Gas   Analysis   Apparatus.  .276-283 
Gas  Analysis  Appa'ratus,  Bur- 

rell    278 

Gas    Analysis    Apparatus, 

Dwight's  CO2    278 

Gas  Analysis  Apparatus,  Elli- 
ott's        281 

Gas  Analysis  Apparatus,  Hin- 

man-Jenkins    282 

Gas    Analysis    Apparatus, 

Lunge   372 

Gas   Analysis   Apparatus,    Or- 

sat    277-281 

Gas    Analysis   Apparatus,   Or- 

sat-Fischer     279 

Gas   Analysis   Apparatus,   Or- 

sat-Lunge    279,   372 

Gas   Analysis   Apparatus,   Or- 

sat-Muencke   279 

Gas   Analysis   Apparatus,   Pe- 

terson-Palmquist    270 

Gas  Analysis  Apparatus,  Ref- 
erees     11,  282 

Gas  Analysis  Apparatus,  Rue- 

dorff    282 

Gas    Analysis    Apparatus    for 
Sulphur    and    Ammonia.... 

11,   281,   282 

Gas  Analysis  Apparatus,  Tut- 

weiler    283 

Gas    Analysis    Apparatus,    U. 

G.    1 294 

Gas    Analysis    Apparatus,    U. 

S.   Bureau   of   Mines 276.   277 

Gas    Analysis    Apparatus,    U. 

S.  Steel 280 

Gas   Analysis    Apparatus. 

Winkler    282.   294 

Gas  Analysis  Apparatus,  Wil- 
liams       281 

Gas    Apparatus    for    Benzene 

Vapor    278 

Gas   Apparatus,   Chancel's....    281 
Gas   Apparatus   for   Dust   De- 
termination         285 

Gas    Apparatus    for    Nitrogen 

Determination   371,   372 

Gas    Bags    282 

Gas  Balance   286 

Gas   Balloons    63 

Gas  Bottles,  Cubic  Foot 292 

Gas   Bulbs 63,   279.   428 

Gas  Burettes   282.   283 

Gas  Burners    113-120 

Gas  Calorimeters,  Junkers... 

284.   285 

Gas   Calorimeter,   Mann 285 

Gas   Calorimeter,   Parr 283 

Gas   Calorimeter,   Sargent....    284 
Gas    Calorimeter    Thermome- 
ters     284.   494 

Gas   Collecting   Jar,   Chidlow.    253 

Gas  Collecting  Tubes 286 

Gas   Collector,   Doremus 286 

Gas    Connecting   Tubes 506 

Gas    Cylinders    for    CO2    Oxy- 
gen,  etc 274,  275 

Gas  Cylinder  Valves 274.   275 

Gas  Density  Balance,  Edwards  286 

Gas   Distributors    287 

Gas  Ejector   285 

Gas   Electrodes    398 

Gas   Electrode   Support 398 

Gas    Explosion    Pipettes.  .293,   294 

Gas  Filters   287.   601 

Gas    Filter    Attachment 501 

Gas  Filter  Tube 287,   501 

Gas    Flame   Testing   Burner.  .    376 

Gas  Generating  Bottles 287 

Gas   Generators    287-289 

Gas  Heated  Drying  Ovens.386-388 
Gas  Heated  Paraffine  Ovens.. 
394,   395 


CENTEAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


539 


Page! 

Gas  Heated  Water  Baths 

513,    514.    517,   620 

Gas   Holders    2«8 

Gas  Hose,   Rubber 430.  431 

Gas  Hot  Plates 310 

Gas      Lamps,      Harcourt-Pen- 

tane  291 

Gas   Lighter    288 

Gas   Machine,   Matthew's 289 

Gas  Measuring  Tubes 289 

Gas  Meters 284,   285.  289 

Gas  Meter  for  Junker  Gas  Ca- 
lorimeter     284,   285,  289 

Gas  Palladium  Tube 290 

Gas  Photometers    290.  291 

Gas  Pipettes    293,  294 

Gas  Pliers   411 

Gas   Pressure   Regulators.... 

274.   275.   284.   285.   294 

Gas  Pressure   Regulators  for 
Junker's  Gas  Calorimeter.. 

284.   285 

Gas    Pressure    Regulator    for 

Thermo-Regulators    294 

Gas  Reduction   Factors 284 

Gas  Regulator  for  Autoclave.      28 

Gas  Stop-Cocks 287.  470.  471 

Gas  Stoves   117 

Gas  Thermo-Regulators    601 

Gas   Tips    294 

Gas  Tongs   411 

Gas  Washing  Bottles 294 

Gasoline    Blast    Burner 

121.   122.   269 

Gasoline    Blowpipes. .  121.   122.   269 
Gasoline   Blowpipes    for   Fur- 
naces     122.   264.   269 

Gasoline  Burner.  Cary's..l22,  269 
Gasoline  Burner,  Dangler....  122 

Gasoline  Furnaces   

264,    265,    268,   269 

Gasoline  Gas  Burners 118 

Gasoline   Gas   Hot   Plates....    310 

Gasoline   Gas   Machines 289 

Gasoline    Gas    Regulator 289 

Gasoline   Gas   Stoves 117.  310 

Gasoline   Hydrometers    313 

Gasoline   Tank   Outfit 122 

Gasoline  Torches    121 

Gasometers   288 

Gasometer  Chart.    Frost's....    235 

Gauntlet  Gloves 297.   298 

Gauze,  Platinum    410 

Gauze,  Wire    623 

Gauze  Electrodes.  Platinum..    410 

Gauze   Top,    Burner 123 

Gawalowsky's    Burettes    Ill 

Gay-Lussac    Specific    Gravity 

Bottles    104 

Gay-Lussac   Support    477 

Gear,     Speed     Reducing,     for 

Motors   216 

Geissier  Air  Pump 242 

Geissler  Alkalimeter    129 

Geissier  Burettes    Ill 

Geissler   Carbon   Dioxide   Ap- 
paratus       129 

Geissler  Filter  Pump 242 

Geissler  Potash   Bulbs 413 

Geissler  Specific  Gravity  Bot- 
tle        104 

Geissler    Stop-Cocks    472 

Geissler  Stop-Cock  Burettes..  Ill 
Geissler-Wetzel  Potash  Bulb.  414 
Gelatine  and  Glue  Tester....  298 
General  Chemical  Co.  Arsenic 

Tube    17 

Generating   Flasks    244.   287 

Generators,  Electric  ....207,  208 
Generators.  Electric  Motor... 

217.   218 

Generators,    Gas     287.   288 

Genus   Covers.   Botanical 95 

Geological   Hammers    94.   303 

Geological   and   Mineralogical 

Apparatus. .  .92-94.    303.   364.   365 
German  Silver  Weighing  Dish 

with  Counterpoise    62 

German  Silver  Weights 58 

German   Silver  Wire 522 

Germinating  Apparatus..  .299.   300 

Germlnators.  Grain 299.   300 

Geryk   Air  Pumps 416 

Gile's   Volumetric    Flasks....    25ft 

Gilmore  Needles    132 

Gimlets   295 

Glaser  Combustion  Furnace.  .   262 

Glasses,   Bell    79.   80 

Glasses,   Goggles    298 

Glasses,  Micro  Cover 350 


Pa^e 

Glasses,    Reading    335 

Glasses,  Sand   434 

Glasses.    Sedimentation     487 

Glasses.   Test    487 

Glass,   Thief    379 

Glasses.    Tumbler    78.  507 

Glasses.   Watch    612 

Glass   Balloons    63 

Glass   Beads    295 

Glass    Beakers    77.   78 

Glass  Blowers'  Blast  Burners  1 

Glass   Blowers'   Fires 117 

Glass   Boxes    188 

Glass  Carboys    129 

Glass   Cutters    295.   296 

Glass  Chimneys    114.   145 

Glass  Combustion  Tubes.  Py- 

rex     163.   297 

Glass    Connecting   Tubes 506 

Glass    Cutting   Diamond 295 

Glass  Cutting  Tools 295.   296 

Glass   Disk   Cutters 295 

Glass  Evaporating  Dishes...  186 
Glass  Extraction  Thimbles.  .  233 

Glass  Funnels 113,  257-259 

Glass  Graduates    183.   299.   301 

Glass  Jars 13.  16.  66-70. 

72.   79.    80,   105,    153,    183.    326-328 

Glass   Knives    296 

Glass   Mortars    367 

Glass  Pencils 185,   396 

Glass.   Pulse    414 

Glass  Plates.  All  Kinds 

132.   407.    408 

Olass  Plates  for  Cement  Test- 
ing       132 

Glass   Retorts    427.   428 

Glass   Rings   for  Micro  Slides  349 

Glass   Pod    296 

Glass    Scoops    62 

Glass  Siphons    443 

Glass  Spatulas   461 

Olass   Snoons    462 

Glass   Stirrers    296.   470 

Glass   Stop-Cocks 112,   471.   472 

Glass  Trays   504 

Glass  Triangles   186 

Olass  Tubes. 163,  296,  297,  427.   446 

Glass   Tubes.   Bomb 297 

Glass    Tubes.    Sealing 297 

Glass   Tubing    296.   297 

Glass  Tubing  Cutter 295.   296 

Olass    Tubing   Gage 272.   273 

Glass   Tumblers    78.   5«7 

Glass  Wool    297 

Olass  Writing  Diamonds 186 

Glazed  Paper    390 

Glazed  Paper  for  Kvmograph   329 
Glaziers'  Diamond  Glass  Cut- 
ter        295 

Olinsky  Distilling  Tube 200 

Globes,   Deflagration    184 

Gloves,   Asbestos    297 

Gloves,  Rubber 297.   298 

Glucose  Pipette    404.   475 

Glue.   LePage's    298 

Glue.    Marine    298 

Glue   Hydrometers    313 

Glue    Tester.    Scott's '298 

Gluten    Plates    255 

Goetz    Phosphorus   Tubes.  135.  141 

Gos-gles    298 

Gold  Lacnuer   330 

Gold    Leaf    256 

Gold   Washing  Horn 298 

Gold  Washing  Pan 298 

Goldbeaters'   Skin    298 

Ooldschmidt's  Thermit    490 

Goniometers.  Penfield's.  .  .298.  299 
Oooch  Crucible,  Asphalt. .  .20.  173 
Gooch  Crucible.  Bitumen.. 20.  173 
Gooch  Crucibles,  Filtering...  173 
Gooch  Crucibles.  Platinum...  408 
Gooch  Crucibles.  Porcelain  .  . 

20.   172.   173 

Gooch  Crucibles,  Transparent 

Quartz    173 

Gooch  Crucible  Filter  Tubes.    257 

Gooch  Crucible  Tubing 431 

Gouges    145 

Gowns.   Operating    14 

Graduates,  Conical 299 

Graduates.   Cylindrical 183.   299 

Graduates.  Glass   299 

Graduates  for  Moisture  Test- 
ers     183.    299 

Graduated   Bottles    

104,    105.    183.    327 

Graduated   Flasks    

249.   250.    380.   475 

;  Graduated  Funnels    257-259 


Page 

Graduated  Mixing  Cylinders..   18S 
Graduated   Test   Tubes... -5.o.g.    ^ 

Graham-McCaH's        Drainage 

Apparatus    448 

Grain      Germination      Tester, 

Sho-Gro    8 

Grain   Germinator,   Sch5njahn   3 

Grain    Separating   Device 3 

Grain   Tester.   Grobecker 8 

Grain  Testing  Apparatus.. 299-302 
Grain  Testing  Balances..  .^    ^ 

Grain   Tester   Fillers 301 

Grain  Mills JJ8 

Graniteware  Casseroles 130 

Graniteware  Dishes   . .. . . .  .^    ^ 

Granulated  Carbon 624 

Graphite    Protecting    Tubes..    4 
Gray's  Carbon  Residue  Flask  241 

Grease  for  Stop-Cocks 4 

Green's    Filter    Paper 2 

Green  Oil  Soap * 

Greenman    Burner    1 

Greenman  Thermo-Regulator.   501 

Grenet  Batteries 

Grethen   Weighing  Bottle 107 

Griffin  Beakers    

Griffin's  Glass  Tubing  Cutter.    2 
Griffin's  Wash  Bottle  Tube..   1 

Griffin's  Water  Bath 5 

Griffith's  Test  Tube  Support. 

Grinders   f Crushers)    175"15 

Grinders  for  Metal  Specimens  3 

Grinders.  Tool    ••    303 

Grinding.   Crushing   and   Pul- 

vprlzlng   Apparatus    175-181 

Grinding    and    Polishing   Ma- 
chines      337.   3 

Grindstone    3 

Grobecker  Grain  Tester.....  .    3 

Guard   for  Burners 123.   375 

Guinea  Pig  Holders ill2',! 

Gummed    Labels    329.  830.   3 

Gummed  Tape 95.  4 

Gutta  Percha  Bottles 103 

Gutzeit-Bragg  Apparatus    ... 


Hack    Saws    .............  337.  434 

Hack  Saw  Blades  ..........  .  .    434 

Haemacytometers    .........  84>-5 

Haematokrit    ...........  •  •  .  •  •   If  4 

Haematology,  Apparatus  for.82-87 
Haemoglobin  Standard.  Kutt- 

ner  ....................... 

Haemoglobinometers    ........      85 

Haessler-Newcomer     Haemo- 

globlnometer    ............. 

Hair  Hvgrometers    .........  .   315 

Half    Elements    for    Physical 

Chemistry    ................   8 

Half   Meter  Sticks  ...........   435 

Half  Round  Files  ............   2 

Hall's  Purlnometer   ..........   5 

Hammers    ................  94.   3 

Hammers.  Blowpipe    ......  94.  3< 

Hance   Mills    ................    177 

Hand  Balance   ............... 

Hand  Blowers   .............. 

Hand   Drills    ........  203,  204.   295 


373 

346 

* 

335 

3 

4 

1 

168 

512 

235 

355 

291 

488 

427 
103 
107 
258 
461 
506 
526 
94 
305 

304 
481 
358 


142. 
Hand  Feed  Arc  Lamp  ........ 

Hand    Level    ................ 

Hand   Magnifiers    ........  334. 

Hand  Microtome   ............ 

Hand   Samplers  for  Coal.  etc. 
Hand   Screw  Clamps  ......... 

Hand  Tally   ................. 

Hand    Vises    ................ 

Handles  for  Files  ............ 

Handle  for  Microtome  Knives 
Harcourt  Pentane  Lamp  ..... 

Hard  Glass  Test  Tubes.  .  .  .94. 

Hard  Glass  Tubes  for  Blow- 

piping   ..................  94. 

Hard   Rubber  Bottles  ........ 

Hard   Rubber  Bottle  Rest  ---- 

Hard    Rubber  Funnels  ....... 

Hard  Rubber  Spatulas  ....... 

Hard    Rubber   Tubes  ......... 

Hard   Rubber  Tubing  ........ 

Hardness   Scale    ............. 

Hardness   Testers    ........  303 

Hardness  Test  Measuring  Mi- 

croscope  .................. 

Hardwood   Supports    ......  477 

Hart's  Casein  Tube..  188,  141. 


540 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Page 

Harvard  Trip  Balance 64 

Hasselbalch    Gas    Electrode..    398 

Hatchet 306 

Heads  for  Centrifuges 

134,    136.   138-142 

Heat  Absorption  Apparatus..    446 

Heat  Gages 417-423 

Heat  Treating  Furnaces. 263.  271 
Heaters,  Electric,  All  Kinds 

233,    234.    305-310.    360 

Heaters,  Electric  (Hot  Plates) 

308-310 

Heaters,   Electric  Coll 306.  307 

Heaters.     Electric     for     Milk 

Testers   360 

Heaters,    Extraction    Appara- 
tus     233.   234 

Heaters   for  Flasks 250 

Heater  for   Flasks,   with   Hot 

Plate    306 

Heaters  for  Soldering  Irons.  .   118 
Heaters,    Water,    Instantane- 
ous     307.   308 

Heating   Devices   for   Incuba- 
tors      321.   322 

Heating    TTnits,    DeKhotinsky 

Standard  307 

Heating  Wire    

260.  261,   263,   266,  267,   522 

Heavy  Beakers    78 

Heeren's   Ploscope    362 

Hehner's  Color  Comparator.. 

153.   520 

Hehner's  Color  Tubes. ..  .153.   520 

Hehner's  Cylinders    153,   520 

Helm's  Animal  Cage 12 

Hempel  Distillation  Flask...  246 
Hempel  Distilling  Tube  for 

Tar    200 

Hempel  Gas  Burettes.  ..  .282,  283 
Hempel  Gas  Palladium  Tube.  290 

Hempel  Gas  Pipettes 293.  294 

Hempel-Tutweiler     Gas     Bu- 
rette        283 

Hempel-Wlnkler  Gas  Burette  282 
Hennlnger-Le    Bell's    Distill- 
ing Tubes    200 

Herbariums    96 

Herman  Electrolytic  Outfit..  229 
Hess-Ives  Tint  Photometer. .  156 
Hlggln's  Water  Proof  Ink...  201 
High  Range  Thermometers..  491 
High  Resistance  Pyrometers 

417-419 

High    Speed   Turbine   Stirrers 

470.   517.  518 

High  Temperature  Burners..  119 
Hlerh  Temperature  Drying 

Oven    387 

High  Temperature  Furnace..   271 

Hierh  Vacuum  Pumps 415 

Hildebrand's     Calomel     Elec- 
trode        397 

Hildebrand's  Gas  Electrode..   398 

Hind's  Gas  Generators 287 

Hinman-Jenklns  Gas  Appara- 
tus       282 

Hlrsch  Funnels   258 

Hlstologlcal      Apparatus      for 

Embedding 354.   392-395 

Hitrhens  Svrlnge    486 

Hoffmann   Clamps    146.   148 

Hoffmann  Lecture  Apparatus.   332 

Hoffmann   Water  Bath 517 

Hogarth  Specific  Gravity  Bot- 
tle         104 

Hoist   for   Soil   Tubes 454 

Holders,  Animal   12,  IS 

Holders   for   Charcoal 93 

Holders  for  Conductivity  Cells    397 

Holders  for  Crucibles 174 

Holders  for  Culture  Dishes..    181 

Holders   for   Cupels 94 

Holders   for   Dishes 181 

Holders  for  Extension  Clamps  148 
Holders  for  Gas.  .282.  285,  286,  288 
Holders  for  Microtome  Knives  365 

Holders    for    Needles 190.   326 

Holders   for  Petrl   Dishes....    181 

Holders     for    Slides 256,350 

Holders  for  Test  Tubes 

146,    147,    480.   481 

Holders    for    Tools 503,   504 

Holders    for    Triangles 605 

Hollard's  Platinum  Electrodr    410 

Holman's    Current    Slide 349 

Holman's    Siphon    Slide 349 

Homeopathic   Vials 99 

Hones     354 

Honing    Backs     855 


Page 

Hooks   and   Chains 190 

Hooks,   Collar    149 

Hooks,   Screw    438 

Hopkins      Connecting      Bulb 

Tube     371 

Hopkins    Distilling    Tube 371 

Hopkins  Kjeldahl  Connecting 

Bulbs    371 

Hopkins  Limestone  Tester. .  460 
Hopkins  Reflux  Condenser. .  165 
Hopkins  Vaccine  Tubes  ..138,  141 

Horismascope     608 

Horn,    Gold    Washing    298 

Horn    Pan    Balance     48 

Horn     Scoops     436 

Horn    Spatulas    461 

Horn     Spoons     462 

Hortvet   Distilling   Apparatus  199 

Hortvet   Tube    475 

Hose,    Rubber    430,431 

Hose     Connectors     308 

Hosklns     Chromel     Triangles 

606 

Hoskins  Electric  Combustion 

Furnaces     260 

Hosklns      Electric      Crucible 

Furnaces     263 

Hosklns   Electric   Hot  Plates 

309,  S10 

Hoskins  Electric  Muffle  Fur- 
naces     263.  266 

Hosklns  Pyrometers   421 

Hot   Air   Blast,    Electric 88 

Hot  Air  Ovens 383-388 

Hot  Air  Sterilizers 466-4BS 

Hot    Blast    Blowpipes     93 

Hot    Plates.    Electric 308-310 

Hot  Plate  with  Flask  Heater.   30* 

Hot  Plates,   Gas    117,  310 

Hot   Plates,    Sand    434 

Hot    Water    Funnels 25» 

Hour    Glasses    434 

Household    Still     195 

Household  Thermometers  .  . .  494 
Hubbard  Specific  Gravltv 

Bottle     24,   104 

Huber   Warming   Table S^n 

Hughes   Electric   Ovens 382 

Hulett   Mercurv    Still 191 

Huyghenlan     Eyepieces 344 

Hydro-Carbon    Burners     .... 

121.    122,    264,   260 

Hydrogen     Balloons 63 

Hydrogen  Determination  Ap- 
paratus       277 

Hydrogen     Gas 274 

Hydrogen  Gas  Generators  287,  288 
Hydrogen  Ion  Concentration 

Apparatus    86 

Hydrogen   Ion    Determination 

Apparatus 277 

Hydrogen     Sulphide     Genera- 
tors    287 

Hydrogen  Sulphide  Testers.  . 

281     282 
Hydrometers,'  All    Kinds.'. 311-315 

Hydrometers,  Acid    311-313 

Hydrometers,   Asphalt    23 

Hydrometers,   Battery    ....71,   813 

Hydrometers,  Milk    313,   314 

Hydrometers.  TTrlne 510 

Hydrometer   Carrying   Case..   SI 4 

Hydrometer  Jars    183,  610 

Hydrone   2 

Hydrostatic  Balance    357 

Hydrotimeter    315 

Hvgrodelk 316 

Hvgrograph    317 

Hygrometers     315-317 

Hygrometers,    Recording 317 

Hygrometers     (Sling     Psych- 

rometers)     317 

Hygrometer  Wicks,  Silk 317 

Hypodermic  Needles 486.  486 

Hypodermic  Syringes  .  .  .  .484,  485 


Ice  Bag   317 

Ice   Machines    3 

Ice  Shaver 817 

Ideal   Wire    622 

Ignition  Capsules   ...127,   129,  162 

Ignition  Tubes   163,  427 

Tier  Cupel   Machine 182 

Illinois  Butter  Test  Bottle. . .  367 
Illinois  Steel  Co.'s  Collecting 

Tube    286 

Illinois    Steel    Co.'s    Gas    Bu- 
rette      283 


Page 
Illinois     Steel     Co.'s    Sulphur 

Rack    476 

Illuminating  Apparatus,  Mi- 
croscope   345-347 

Illuminating  Burners   ....117.   366 
Illuminating  Lamps.. 117,   345-347 
Illuminator,    Bull's-Eye    Con- 
denser        345 

Illuminators.  Dark  Field....  344 
Immersion  Electric  Heaters. 

306,   SOT 

Immersion   Electrodes 397 

Immersion  Oil.   Cedarwood...    34.ri 

Immersion   Oil   Bottles 100 

Imperial  Ammeters  and  Volt- 
meters    210 

Incandescent   Burners    117 

Incandescent  Gas  Micro  Lamp  117 
Incandescent  Lamps.  .331,  345-347 
Incineration  Dish,  Alundum.  162 
Incineration  Pan,  Platinum.. 

162,   409 

Inclinator    for    Carboys 129 

Incorridible  Laboratory  Bur- 
ner    114 

Incubators,    Bacteriological.. 

318-325 

Incubators       and       Parafflne 

Ovens     393-395 

Incubator   for  Microscopes...    346 

Incubator  Heaters    321-322 

Incubator  Thermometer 495 

India   Rubber  Tubing 430.  431 

Indicator,  Polarity 228 

Indicators,    Speed    462 

Indicators  for  Speed  of  Cent- 
rifuges  135,  138.  141 

Induction  Coils    208.    399 

Infusion   Kettles    329 

Injection  Needles  for  Syr- 
inges    485 

Injection    Syringes    485,   486 

Injector   Burner 119 

Ink,  Waterproof  Drawing..  201 
Ink  for  Writing  on  Glass....  185 

Inoculating   Needles        326 

Inocul'tin-r    Needle    Holder   ..326 

Insect   Bottles    100 

Insect  Breeding  Cages   326 

Insect    Nets    32« 

Insect  Spreading  Boards....  328 
Insect,  Perforated,  for  Water 

Baths     480,  519 

Insplssators,     Gas     83 

Instantaneous  Water  Heaters 

307,   308 

Instruments,  Dissecting. .  .189-194 
Instruments,  Drawing  ...201-203 
Instruments,  Electrical,  All 

Kinds 66-76,    205-229, 

233,    234,    254,    260,    261,    263. 
266,  267,  270,  271,  305-310,  403,  455 
Instrument   Cases.   Dissecting  193 

Instrument   Sterilizers    465 

Insulated    Wire    521,   523 

Insulating  Tape   229 

Insulators,  Pyrometer  Tube.. 

420,    421 

Interchangeable  Electroscope, 

Lind     423 

Internal  Revenue  Hydrome- 
ters    312 

International  Atomic  Weights    144 
International  Electric  Centri- 
fuges. .139-141,  142,  360,  446,  447 

Interval  Clock   152 

Interval    Timer    152 

Invertebrate  Dissecting  Scis- 
sors    192 

Inverted   Specimen   Jars    ....   104 
Iodine      Coulometer,      Wash- 
burn's     397 

Iodine  Number  Determina- 
tion Flasks  248 

Ions,  Apparatus  for  the  De- 
termination of  the  Migra- 
tion of  399 

lonization   Cell,   Smith-Hale..   399 

Iron  Chimney 123 

Iron  Crucibles 171,  174.  427 

Iron   Dishes    298,  433 

Iron    Evaporating   Dishes....    433 

Iron   Gauze    623 

Iron  Gold  Washing  Pans 298 

Iron  Levels,  Mechanics' 333 

Iron  Machine  Screws 436 

Iron   Molds    132.  366 

Iron   Mortars    367 

Iron   Ore  Grinders 175-177 

Iron  Plumb  Bob 412 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


541 


Page 

Iron   Retorts    174.  438 

Iron   Rings    428 

Iron  Rod    625 

Iron   Sand  Baths 433.  4J4 

Iron  Scoops    432.  435 

Iron  Sheet 625 

Iron    Stands    477.  478.  480 

Iron  Supports 477.  478 

Iron   Triangles    504,  608 

Iron   Tripods    477.  505 

Iron   Weights    69.   60 

Iron   Wire    622 

Iron   Wire   Gauze 623 

Iron   Wire   Triangles 504.   505 

Iron-Clad   Relay    500 


Jackson   Specific  Gravity  Ap- 
paratus     133 

Jackson    Turbldimeter    507 

Jam  Jars    328 

Japanese   Lens   Paper 333 

Japanned   Frame   Thermome- 
ters        495 

Jars.    All    Kinds 9. 

11.    13.    16.   66-70.    72,    79.    80. 
104.    105,    124,    153,    183.    326- 

329    451 

Jars.   Acid    • 

Jars.    Anaerobic   Culture 11 

Jars.   Animal    13 

Jars.  Aquaria   16 

Jars,   Battery 66-70,   72.   326 

Jars.   Bell    79.  80 

Jars,    Brain    327.  328 

Jars.   Calcium   Chloride. .  .124.  160 

Jar.    Chldlow    Expansion 252 

Jar.  Chidlow  Gas  Collection..    253 

Jars,   Culture    11 

.Tirs.  Dressing   327 

Jars,   Drying    124.  160 

Jars.    Expansion    252 

Jars.  Hydrometer 183 

Jars,   Inverted   Specimen 104 

Jars.    Jam    328 

Tars.  Jellv 329 

Jars.  Lightning   328 

Jars.    Mixing    183.   327 

Jars,  Museum    327,   328 

Jars.   Nessler    153 

Jar,  Organic  Matter 461 

Jqr=.   Percolator    327 

Jars.   Precipitating    327 

.T^rs.  Sample 103.   105.   328.   357 

Jars.   Screw  Cap 103,   105,   357 

Jars.    Specimen    

103,   105,    327.    328.   357 

.Tqrs.  Staining   328 

.Tars.    Stoneware    329 

.Tqrs,   Snre   Seal 328 

Jars.   Waste    329 

Jar  Brushes 108,   109 

Jetfer's   Counting  Plate 169 

Jellv  Jars    329 

Jennine-s     Kjeldahl     Connect- 
ing- Bulb 371 

.Tewplers'    Rlowpines 92.   93 

Jewelers'   Screw  Driver 437 

Jewelers'    Soldering   Copper.  .    460 

Jewell    Stills    196.   197 

.Tewett's   Reagent   Bottles....    103 
Johnson  Combustion  Appara- 
tus        160 

Johnson  Combustion  Boats..  162 
Johnson  Combustion  Train..  160 
Johnson  Combustion  Tubes.  .  163 
Johnson  Combustion  Tube 

Connectors    163 

Johnson  Digestion   Apparatus  370 

Johnson   Drying  Jar 160 

Johnson    Filtering   Crucible..    171 

Johnson    Flask    249 

Johnson     Kjeldahl     Digestion 

Shelf    370 

Johnson   Milling   Machine....    160 

Johnson  Potash   Bulb 160.  413 

Johnson  Rule 432 

Johnson   Sulphur  Flask 249 

.Toilet  Flasks   248 

Jones   Boiling  Point   Appara- 
tus        401 

Jones  Sampler    432 

Julian        Color        Comparison 

Tubes     153 

Julian   Crucible  Tongs 508 

Junkr-rs  Gas  Calorimeter .  2S4.   2SS 


K  Page 

Kahlenberg's   Gas   Measuring 

Tube    289 

Kalteyer's   Forceps    256 

Kawin   Nickel   Crucible 171 

Keidel    Blood    Collector 83 

Keldel  Vacuum  Culture  Tube     84 

Kekule  Water  Level 387 

Kekule-Von      Baeyer      Atom 

Models    366 

Kent  Laboratory  Shaking  Ap- 
paratus        440 

Kerosene   Heated   Furnace...   265 
Kerosene  Hydro-Carbon  Burn- 
er        122 

Kerosene  Stove 122 

Kerosene    Testers. ..  .314.    374-376 

Kettles.  Granlteware    130.   329 

Keys.  Contact   228.  229 

King's   Soil   Tube 463 

Klpp  Gas  Generator 287 

Klrkbride   Slide   Forcep 256 

Kirshbraun  Adhesion  Machine      18 

Kit.  Emergency   243 

KItasoto   Animal   Holder 13 

Kjeldahl    Apparatus    for    the 
Determination  of  Nitrogen. 

369-371 

Kjeldahl   Condensers    369.  370 

Kieldahl  Connecting  Bulbs...  371 
Kjeldahl   Digestion   Shelves.. 

369-371 

Kjeldahl  Distilling  Apparatus 

370.  371 

Kjeldahl   Distilling  Flasks...    248 
Kjeldahl  Flask  Heater.  Elec- 
tric       305 

Knives.    All    Kinds 168. 

190,    203,    253.    296.    329.    351.    355 

Knife,   Cartilage    190 

Knife.    Cork    168 

Knife.  Dough  Mixing 253 

Knife.  Draw   203 

Knife,  Glass   296 

Knives,   Microtome    351.  355 

Knives.   Sectioning    351.   355 

Knife  Holders  for  Microtome 

Knives   353.   355 

Knight  Distilling  Tube 200 

Knorr  Alkalimeter 129 

Knorr  Carbonic  Acid  Appara- 
tus       129 

Knorr  Extraction  Flasks.... 

230,  231.  247 

Kober's   Nephelometer    158 

Koch  Hot  Water  Funnel 258 

Koch  Safety  Burners 114.  115 

Koch   Serum   Oven 

Kohlrausch  Conductivity  Cells   396 
Koblrausch  Volumetric  Flasks  250 

Kolle   Culture   Flasks 1 

Kuttner  Micro-Colorimeter...   156 
Kuttner  Standard  Color  Tubes 

85,  157 

Kymograph   329 


Labels.  Dennlson  330 

Labels,  Micro  Slide 330.  350 

Label  Books  330 

Labelled  Bottles  101-103 

Laboratory  Aprons  14 

Laboratory  Cement,  DeKho- 

tinsky  130 

Laboratory  Clocks  152 

Laboratory  Gas  Meters 

284,  285.  289 

Laboratory  Grinders  and 

Crushers  175-181 

Laboratory  Knives 329 

Laboratory  Lamps 94. 

117.  120,  291,  331.  332.  345-347 

Laboratory  Microtomes  352 

Laboratory  Mills  177-181 

Laboratory  Scales 30-55 

Laboratory  Sleeves  14 

Laboratory  Sponges  462 

Laboratory  Tubing.. 117,  430.  431 
Labruco  Rubber  Tubing.. 430.  431 

Lacquer,  Colorless  330 

Lacquer.  Gold  330 

Lacquer  Brush 109 

Lactic  Acid  Funnel,  Straus..  259 
Lactometers  (Hydrometers)..  313 
I^adenburg  Distillation  Flask  247 

Ladle.  Melting  330 

Lamps,  All  Kinds 94.  117. 

120,    155.    291.    331.    332.    345-347 


Page 
Lamps,  Alcohol  ..............   1ZO 

Lamps,   Blast    ............  119-12Z 

Lamp,  Blowpipe   ............ 

Lamp.  Dangler  ..............  1 

Lamp,    Davy's   Safety  ........   332 

Lamp.   Daylight    .....  155.  345-347 

Lamps,  Glass  Blowers'  .......   1 

Lamp.   Harcourt  Pentane  .... 

Lamps,  Microscope  .......  345-34 

Lamp,  Pentane    .............   2 

Lamp.  Photometer  Standard.   2 
Lamp  Chimneys   .........  114.   146 

Lamp  Cord    .................   621 

Lamp  Wicks.  Alcohol  ........   120 

Lancets   for   Blood  ...........      86 

Lautenschlaeger  Hot  Air  Ster- 

ilizers .....................  468 

Leach       Separatory       Funnel 

Support    ..................   479 

Lead   Assay  Crucibles  ----  170.  1 

Lead  Capsules    ..............   1 

Lead    Crucibles    (Plumbago).   1 
Lead  Dishes    ................    1*7 

Lead    Pipe    ..............  370.  525 

Lead  Sheet  ..................    626 

Lead   Sl.ot    ..................   332 

Lead  Shot  for  Cement  Testers  II 
Lead  Tubing   ................    625 

Lead  Wire  ..................    622 

Leather   Belting    ............    332 

Leather.  Evaporators  for  .....  514 

Leather    Extraction    Appara- 

tus    .......................  232 

Le    Bel-Hennlnger    Distilling 

Tubes    ....................    200 

LeChateller  Cement  Bottle...    104 
LeChateller     Soundness     Test 

Anparatus  for  Cement  .....    133 
LeChateller    Specific    Gravity 

Bottle    ....................   104 

LeClanehe  Batteries   .........     ' 

Lecture   Apparatus    ......  332.  8 

Lecture   Room   Charts.  ..  .144.  145 

Lecture   Table   Balance  ......     49 

Lecture  Table  Galvano-Volt- 

Amm°ter    ...............   2 

Leeds   Diamond   Mortar  ......    366 


. 

Lenses.  Objectives   ..........   8 

Lenses.  Pocket   ..........  334.   335 

Lens  Holders    ...............   1 

Lens   Paper.    Japanese  .......   8 

Le  Page's  Glue  ..............   29S 

Lewis    Instrument    Sterilizer.    46! 
Lewis  Paraffine  Bath  ........    392 

Letters,  Steel   ...............    1  M 

Letters.  Stencil    .............    4«S 

Levels  .......  61.  333.  334,  482.  48S 

Level.  Water,   for  Ovens  .....    387 

Leveling    Bulb    for    Gas    Bu- 

rettes   ...................  '.  1 

Leveling  Screws   ............  3 

Lever  Action  Air  Pump  .....  .   4 

Levigated   Alumina    .........   838 

Levy  Haemacytometers    .....      84 

Library  Paste    ..............   3 

Llebig  Condensers    ..........    165 

Llebler  Potash  Bulb  ..........   418 

Lleblg-Dlttmar  Potash   Bulb.    413 
Life   Box.    Slide  ..............    349 

Lifters.   Section    .............    193 

Lighter.  Gas   ................    288 

Lightning  Jars   ..............    328 

Lie-tuning   Sifter    ............    443 

Lillie     Parafflne     Embedding 

Ovens    .................  394,  395 

Lime  Cylinders    .............      93 

Limestone  Testers    .......  129.  450 

Lime-SulDhur   Hydrometers..    313 
1  Lincoln    Burette   Clamp  ......    146 

Lind  Electroscopes  .......  423-425 

Line.  Fish    ..................    165 

Line.   Mason's  Chalk  .........    165 

Linen  Cord    .................   1 

Linen  Tape  Measures  ........    486 

Linen   Testers    ...............   334 

Linen   Thread    ...............   501 

Linen   Twine    .....  ...........    507 

Lintner   Pressure   Bottle  .....   100 

Lineman   Capillary   Electrode 

Tube    .....................   398 

Liquid  Measures   ............    336 

List  of  Blowpipe  Apparatus.93.   94 
Liter  Flasks    ................    249 

Litmus   Paper    ...........  390.  391 

Litmus  Pencils   ..............    395 

Loaf  Volume   Apparatus  .....   255 

Loeb    and    Nernst    Migration 

Tube  ......................    S99 


542 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Page 

Logwood   Paper    391 

Lohnstein  Saccharometers. . ..  509 

Long   Gas   Electrode 398 

Low  Flask  for  Copper  Deter- 
mination        248 

Low  Resistance  Pyrometers.. 

418-421 

Low  Temperature  Burners... 

114.   116 

Low  Temperature  Incubators 

324.   325 

Low  Temperature  Thermome- 
ters   491 

Low     Temperature     Thermo- 
stat        500 

Low's  Copper  Assay  Flasks..    248 

Loxol  Cement 130 

Lubrication  Tester 377 

Luer  Syringes   484,   485 

Lummer-Brodhun  Photometer 

Sight  Box    290 

Lunge  Apparatus.107,  247,  279,   372 

Lunge  Distillation  Flask 247 

Lunge   Nitrometers    372 

Lunge  Tar   Flask 247 

Lunge  Weighing  Bottle 107 

Luther    Capillary    Electrome- 
ter Tube 398 

Luther   Platinum    Electrode..    398 


Machines,  Cement  Testing.... 

131.  133 

Machines,  Centrifugal 141-143 

Machines      for      Compression 

Tests  on   Cement 131 

Machine,   Cork   Boring 167 

Machines,  Cupel    182 

Machines    for    Making    Gaso- 
line Gas    289 

Machines,    Sampling    432.  433 

Machines,  Shaking   438-440 

Machine  Screws 436 

Mackey's   Oil   Tester 379 

Magnalium  Balance 40 

Magnet    205 

Magnet  Wire   621 

Magnetic   Compasses    ....164,  482 

Magnification  Table 348 

Magnifiers,  All  Kinds 

61,  169,  304,  334,  335 

Magnifier   for   Balances 61 

Magnifier  for  Brinell  Tester..  304 
Magnifier   for   Colony    Count- 
Ing  169 

Magnifier  Stands,  Adjustable.  342 
Mahler   Bomb   Calorimeters.. 

127.  128 

Mailing      Cases      for      Micro 

Slides   350 

Mailing  Cases  for  Samples...  264 

Mailing  Tubes    336 

Mallets    335 

Manganese  Determination  Ap- 
paratus     153,  164 

Manganese    Tubes    for    Color 

Comparison,    Camp's    153 

Manila  Rope   428 

Mannheim   Slide  Rule 444 

Mann-Junkers   Gas  Calorime- 
ter      286 

Manometers   272.  273 

Mantles  for  Berkefeld  Filters  236 
Manual     for     Petroleum     In- 
spectors      377 

Marchand     Calcium     Chloride 

Tubes    124 

Marchand  Drying  Tubes 124 

Marine  Glue    298 

Marker,  Signal 501 

Market  Cream  Score  Cards...  363 

Marking  Gage 272 

Marschall   Acid  Tester 356 

Marschall  Rennet  Tester 362 

Marsh's   Arsenic   Apparatus...    16 
Marshall    Apparatus    for    the 
Determination    of    Urea    in 

Blood     87 

Martin,     Pennock     and,     Cru- 
cible      171 

Mask,   Face,   Respirator 427 

Masons'   Chalk   line 165 

Mason's   Fruit   Jars 328 

Mason's   Hygrodeik    316 

Mason's  Hygrometer   316 

Mason's  Water  Color  Tube.  . .  164 
Massachusetts  Institute  Blast 

Burner    119 


.  Page 

Matches,   Safety    336 

Mats,   Asbestos    17 

Mats,   Cork,   "Suberlte". 168 

Matthews  Gas  Machine 289 

Matrass  Holders   94 

Mauls    335,   459 

Maximum  and  Minimum  Ther- 
mometers     495.   497 

Mazda  Incandescent  Lamps.. 

331.    345-347 

McCall  Aspirator 445 

McCall's  Capillarity  Tubes 457 

McCall's  Mulch  Cylinder 450 

McCall's  Percolation  Appara- 
tus        451 

McCoy  Molecular  Weight  Ap- 
paratus        401 

McLeod's   Vacuum   Gage 273 

Measures,   All  Kinds 

125    183,    272-274, 

299.    336,    356,    432.    435,    486.    487 
Measures     for    Acid     in     Milk 

Test   356 

Measures.   Caliper    125 

Measures,    Glass     183,   299 

Measures,   Graduated    ....183,   299 

Measures,  Liquid   338 

Measures.  Meter  and  Yard... 

432.   435 

Measures,  Rain    273 

Measures,  Tin   336 

Measures.  Wire   274 

Measuring   Appliances    

125,    183,    272-275,    289,    299, 

304,   336,   432,   435.    486 487 

Measuring  Bottle,  Bockius...   100 

Measuring   Microscopes    343 

Measuring  Cones    273 

Measuring    Scales    for    Hard- 
ness Tester  304 

Measuring  Tapes   486.   487 

Measuring  Tubes  for  Gas.  . .  .    289 

Meat  Choppers 178,   179,  181 

Mechanics'   Levels    333 

Mechanical   Analysis  Bottle..    446 
Mechanical    Drawing    Instru- 
ments     201-203 

Medicine  Droppers   4 

Megohm    Boxes    222 

Meker  Blast  Burner 120 

Meker  Burners    115 

Melting   Crucibles    ...170-172.  173 

Melting  Furnaces   264.  266 

Melting  Ladles   330 

Melting  Point  Apparatus.... 

18,   23.   336 

Melting   Point   Apparatus   for 

Tar  and  Pitch 18,   23 

Melting  Point  Flask 248 

Melting     Point     Testers     for 

Wax    377,   378 

Melting  Point  Tube 336 

Mendele.leff     Charts      of      the 

Elements   144 

Meniscus  Reader  for  Burettes  113 
Manzles'     Molecular     Weight 

Apparatus   401 

Mercurial   Barometers    ....64.     65 
Mercury  Distilling  Apparatus 

199,   427 

Mercury   Manometers    273 

Mercury  Pipettes   405 

Mercury  Plumb  Bob 412 

Mercury  Reservoirs 110 

Mercury  Retorts 427 

Mercury  Still.   Hulett 199 

Mercury    Wells    for   Armored 

Thermometers    492 

Metal    Cases    for    Thermome- 
ters       492 

Metal  Frame  Thermometers. .   496 

Metal  Model  Sextant 438 

Metal  Resistance  Table 528 

Metal  Scale  Thermometers...    495 
Metal   Testers,  Hardness.  .303-305 

Metal  Travs 604 

Metallic  Tapes    486,   487 

Metallic  Thermometer   49« 

Metallic  Tubing,  Flexible 431 

Metallographlc  Apparatus.... 

337,   338 

Metallographlc  Emery  Paper.   3 
Metallographlc  Grinders    ....    337 
Metallographlc  Hack  Saw.  . . .   337 

Metallographlc  Polisher 337 

Metallographic    Polishing 

Alumina    338 

Meteorological  Set 338 

Meteorological  Shelter 338 

Meters,  Air 12,   285,   289 


Pase 

Meters,    Electric    209-213 

Meters,  Gas 284,   285.   289 

Meters,  Gas,  for  Junkers  Ca- 
lorimeters     284,  285,  289 

Meters,   Turbidity    159.  507 

Meter  Measures    432,   436 

Meter  Sticks 435 

Meter  Stick  Clamps 150 

Methane    Determination    Ap- 
paratus       27fi 

Metric  Charts 145 

Metric  Measures,   Liquid 336 

Metric   Rules    432 

Metric  Tables    145 

Metronomes    338 

Metropolitan   Argand   Burner, 

Carpenter's    292 

Meyer  Bulb  Tubes 8.   476 

Meyer  Sulphur  Apparatus....   476 
Meyer   Vapor    Density    Appa- 
ratus        511 

Mica  Chimney   114 

Mica  Sheet 525 

Mice  Holders    13 

Micro  Burners,  Bunsen's 114 

Micro-Colorimeter    156 

Micro  Cover  Glasses 350 

Micro  Labels   for   Slides.. 330.   350 

Micro   Lamps    345-347 

Mlcro-Saccharimeter   86 

Micro   Slides    348.   34fl 

Micro    Slide    Boxes 349.   350 

Micro  Slide  Cabinets 349 

Micro   Slide  Labels 330.   350 

Micro  Slide  Mailing  Cases. . .  .    350 

Micro  Slide  Trays 350 

Micro  Warm  Stages 350 

Micrometers,   Eyepiece. ..  .347.   520 

Micrometer,   Stage    347 

Micrometer  Calipers 125,   391 

Micrometer  Gages   125.   391 

Micrometer  Microscopes.  .304.   343 

Micrometer  Oculars 344 

Microscopes  and  Accessories. 

339-351 

Microscope,  Demonstration.  .  .  341 
Microscopes,  Dissecting.  .  341,  342 
Microscopes,  Measuring.  .304,  343 
Microscopes.  Micrometer. 304.  343 

Microscope,  Simple 341 

Microscope     Eyepieces    344 

Microscope    Illuminators. .  344.   345 
Microscope    Incubator.    Elec- 
tric         345 

Microscope   Lamps    345-347 

Microscope    Lamp    Distribut- 
ing  Box    347 

Microscope  Micrometers 347 

Microscope  Nosepieces    348 

Microscope  Objectives,  Achro- 
matic       348 

Microscope  Support    343 

Microscopic  Slide  Boxes 349 

Microscopic  Slide  Forceps....  256 
Microscopic  Slide  Mailing 

Cases    350 

Microscopical  Cover  Glasses.  .  350 
Microscopical  Labels  ....330.  350 
Microscopical  Object  Slides.  . 

348.   349 

Microscopical  Slide  Boxes....  34^> 
Microtomes  and  Accessories.. 

351-355 

Migration  of  Ions,  Apparatus 

for    39!) 

Migration  Tubes   399 

Milk  Analysis  Apparatus. .  35R-364 

Milk  Analysis   Bottles 357,   358 

Milk  Bottle  Brushes 109 

Milk  Capsules   129.  187 

Milk  Centrifugal  Machines... 

359-361 

Milk  Dishes 129,  187,  358.  409 

Milk  Dish.  Platinum 409 

Milk   Extraction   Apparatus..    358 

Milk    Hydrometers    313.   314 

Milk  Jar  (Bottle) 357 

Milk  Pipettes    362 

Milk     Pipette     for     Counting 

Bacteria   404 

Milk  Record  Charts 358 

Milk   Test   Bottles 357.   358 

Milk  Test  Brushes 109 

Milk  Tester  or  Pioscope,  Hee- 

ren's    362 

Milk  Testers,  Centrifugal. 359-Sfil 
Milk  Testing  Apparatus.  .35(5-364 
Milk  Testing  Balances. 41,  47,  357 

Milk  Tube  for  Centrifuge 

135,   138.  141 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO.  U.  S.  A. 


543 


Page 

Mills,  Assayers'    175-181 

Mills.   Grinding    175-181 

Mills.  Rolling 180 

Mill,  Sugar  Cane 179.  181 

Miller  Parafflne  Bath 393 

Mllliammeters  and  Ammeters 

209-213 

Milling  Machine,  Johnson....    160 
Millivoltmeters    and    Voltme- 
ters     209-213 

Mine  Air  Analysis  Apparatus 

276.  277 

Mine   Air  Testers 276 

Miner's   Horn    298 

Miner's    Lamp    332 

Miner's  Washing  Pan 298 

Minerals  for  Blowpiping. . . .  94 
Minerals.  Radio-Active...425.  426 

Mineral    Collections    364.  365 

Mineral    Oil    Distillation    Ap- 
paratus     374,   378 

Mineral   Specimens    364,  365 

Mineralogical  Collections.364.  365 
Mineralogical  Hammers.  .  .94.  303 
Mineralogical  Specimen 

Trays    365 

Miniature        Incandescent 

Lamps   331 

Miniature  Microscope  Lamp.  .  346 
Minimum  Thermometers. 495,  497 
Minot  Micro  Slide  Cabinet...  349 

Minute  Glasses   434 

Miquel  Culture  Flasks 182 

Mirrors    for    Galvanometers..    207 

Mitre   Box,   Olmstead's 366 

Mitscherlich   Eudiometer   ....    230 

Mitscherlich   Potash   Bulb 413 

Mittens,   Asbestos    297 

Mixing  Bottles    183,  327 

Mixing  Cylinders,  Precision..    183 

Mixing  Jars   183.   327 

Mixing  Pipettes  for  Haemacy- 

tometers    85 

Mixing   Scoops    432.   435 

Models,  Atom   366 

Models,    Valence,    Mead's 366 

Mohr's  Alkalimeters    129 

Mohr's  Burettes 111.  112 

Mohr's  Carbon  Dioxide  Appa- 
ratus       129 

Mohr's  Clamps 147 

Mohr's  Pinchcocks 147 

Mohr's   Pipettes    405.  406 

Mohr's  Potash   Bulb 413 

Moist   Chambers    181 

Moisture  Absorption  Appara- 
tus        445 

Moisture  Balances. .  .42,  49,  54.  55 
Moisture  Determinator  for 

Gas   285 

Moisture   Dishes    187 

Moisture    Equivalent    Centri- 
fuge        447 

Moisture   Flasks    248 

Moisture   Graduates    183.   301 

Moisture  Ovens    383-388 

Moisture  Scales 42,  49.  54,  55 

Moisture    Test    Cylinders. 183.   301 

Moisture  Testers    301.   361 

Moisture     Tester    Thermome- 
ters     302.   492 

Molds  for  Asphalt 23 

Molds,  Briquette,  Asphalt....  23 
Molds,  Briquette,  Cement....  131 

Molds  for  Cement 131.   132 

Molds,  Cubical  for  Asphalt..  23 
Molds,  Cubical  for  Cement...  132 

Molds,    Cupel    182 

Molds,    Pitch    22.   23 

Molds.   Pouring    366 

Molds    for    Soil 451 

Molding   Machines,   Cupel....    182 
Molecular  Weight  Determina- 
tion Apparatus 400,  401 

Monkey  Wrenches    523 

Monochromatic  Illuminators.  366 
Morse  Calibrating  Burettes..  112 

Mortars,   All   Kinds 366.   367 

Mortar  Grinder,  Steel 177 

Motors,  Electric.  .126,   128,  214-216 

Motors,   Variable   Speed 

126,   128,  214,   373 

Motors,   Water    368 

Motor  Countershaft 216 

Motor   Generators    217.  218 

Motor  Speed   Reducing   Gear.    216 

Mounts,   Riker   Botanical 95 

Mounts.   Riker  Specimen 461 

Mounting  Boards.  Botanical. .  95 
Mounting  Cells,  Slide 349 


Page 
Mounting   Paper,    Botanical. .      95 

Mouse  Jars   13 

Mouth  Pieces  for  Blowpipes..      92 
Muencke    Blast   Apparatus.  .  .      92 

Muencke  Blower 92 

Muencke   Filter   Pump 242 

Muencke  Gas  Analysis  Appa- 
ratus      279 

Muencke  Gas  Washing  Bottle  294 

Muffles,  All  Kinds 265-269.  367 

Muffles,  Alundum   367 

Muffles,   Clay 367 

Muffles,   Silica    367 

Muffle  Furnaces 263.  265-269 

Muffle  Furnace,  Gary's 269 

Muffle  Furnaces.   Fletcher....  265 
Muffle       Furnaces,       Hoskins 

Electric    263.   266 

Muffle       Furnaces,       Multiple 

Unit  Electric 267 

Muffle  Furnace,   Wlessnegg. .   269 

Muffle  Scrapers 436 

Mulch  Cylinders    450 

Mullen's  Paper  Tester 391 

Multiple    Tube    Burners 

115,   116.   119 

Multiple    Unit    Electric    Com- 
bustion   Furnaces    261 

'  Multiple    Unit    Electric    Cru- 
cible Furnace 263 

Multiple     Unit     Electric     Hot 

Plates   310 

I  Multiple  Unit  Electric  Muffle 

Furnaces     267 

i  Multiple  Unit  Electric  Organ- 
ic Combustion   Furnace....    261 

Multiplex    Slide    Holder 350 

Multiplex    Slide    Rule 444 

Murrill's  Gas  Pressure  Regu- 
lator        294 

Museum  Jars 327.   328 

Muslin    Buffing    Wheels..  .412.   413 

Muter's   Oil   Tube 378 

Myers  Colorimeter    157 


Nafis'   Acid  Dippers 356 

Nafis'  Acid  Tester 356 

Nafis'    Salt    Tester 363 

Nafis1   Stirring   Rod 357.  363 

Nafis'  Tester  for  Test  Bottles 

363.   364 

Nail   Sets    368 

Naples   Jars    328 

Naples  Paraffine   Bath 393 

Naples   Staining   Jars 328 

National   Fuller   Battery 68 

National  Rheostats   224 

Natural    Gas    Analysis    Appa- 
ratus       277 

Natural   Gas   Burners 118 

Nead's    Valence   Models 366 

Nebraska    Soil   Auger 452.  453 

Needles,   Dissecting    190 

Needles,   Gilmore    132 

Needles,   Hypodermic    ....485.  486 

Needles.   Inoculating   326 

Needles,   Syringe    485.   486 

Needle   Apparatus,    Vicat 133 

Needle  Holders    190.   326 

Nernst   Migration   Tube 399 

,  Nesbitt     Carbon     Combustion 

Bulbs    8,  9 

Nessler  Cylinders    153 

Nessler   Cylinder   Support....    154 

Nessler   Tubes    153 

Nessler  Tube  Support 154 

Nets   for   Foot   Blowers 88 

Nets   for  Insects 226 

Neubauer-Bfirker      Haemacy- 

tometer 84 

New    York    Board    of    Health 

Distilling   Apparatus    520 

New     York    Testing    Labora- 
tory  Drying   Ovens 21 

New    York    Testing    Labora- 
tory Penetrometers   24 

Nicholson   Hydrometers    316 

Nlchrome   Triangles   505 

Nichrome  Wire  Gauzes 523 

Nickel  Alloy  Wire 522 

Nickel-Chrome   Gauze    523 

Nickel  Chromium  Triangles..    505 
Nickel    Chromium    Pyrometer 

Protecting  Tubes    420 

Nickel   Crucibles    171 

Nickel  Crucible  Tongs 502 

Nirkel  Dishes 187 

Nickel-Plated  Copper  Beakers    78 


Page 

Nickel  Tongs    602 

Nickel  Weighing  Scoop 62 

Nickel  Wire 522 

Nickel   Wire   Gauze 523 

Nickeled   Burette   Clamp 146 

Nicol  Specific  Gravity  Tube. .    104 

Ninhydrin    82 

Nippers   411 

Nipples  for  Air  Pumps 471 

Nitrogen       Apparatus,        Van 

Slyke's    372 

Nitrogen    Bulbs     371 

Nitrogen    Determination    Ap- 
paratus     153.   369-373 

Nitrogen     Filled     Thermome- 
ters    491 

Nitrogen  Gas    275 

Nitrogen,  Urea  and  Ammonia 
in    Urine,    Folin    Apparatus 

for    608.   509 

Nitrometers    371.   372 

Nitrous   Oxide   Gas 275 

Nixtamal    Grinding    and   Pul- 
verizing Mill 178 

Nodon   Valve    219 

Non  -  Corrodible    Laboratory 

Burner 114 

Non-inductive   Resistances...    227 

Normal   Burettes    112.  113 

Normal       Differential       Ther- 
mometers. Beckmann's   ....    493 
Normal    Elements,   Cadmium.    397 

Normal   Flasks    250 

Normal  Graduates   183 

Normal    Mixing    Cylinders....    183 

Normal   Pipettes    406 

Normal        School        Crucibles. 

Skidmore's    174 

Normal   Solution    Flasks 250 

Norris  Potash  Bulb 413 

Norris   Sulphur   Apparatus...    476 
Nosepieces   for  Microscopes..   848 
1  Novy   Anaerobic   Culture   Ap- 
paratus        11 

Novy  Cover  Glass  Forceps...    256 

Novy    Culture    Jars 11 

Numbers,  Steel   186 


Objectives,  Achromatic 348 

Objectives    for    Microscopes.  .    348 

Ocular   Micrometers    344 

Ocular   Micrometer   Disks....    347 

Oil  of  Cedar 345 

Oil  for  Pumps 416 

Oil   Burette   378 

Oil  Burners   122 

Oil  Cans   37S 

Oil   Decanting  Tube 378 

Oil    Distilling   Apparatus.  374.   378 
Oil   Feeder  for  Flotation  Ma- 
chine       251 

Oil   Freezer,   Tagliabue 377 

Oil,  Fusel,  Determination  Ap- 
paratus         271 

Oil  Heated  Parafflne  Ovens . . 

394.   395 

Oil   Measuring   Device,    Auto- 
matic       302 

Oil    Sample    Bottles 100 

Oil  Samplers    379 

Oil  Sampler  and   Water  Indi- 
cator      380 

Oil  Stills 198.   199,   374,   378 

Oil  Stones    373 

Oil  Tables.  Tycos 378 

Oil   Testing  Apparatus.  ..  .373-380 
Oil    Testing    Machine,    Thurs- 

ton   377 

Oil  Thermometers.  . .  .495.  496,  497 
Oil  Tubes  for  B.  S.   in  Petro- 
leum     135.  140.   374 

Oil  Tubes  for  Centrifuges... 

135,   140,  374 

Oil  Tube.  Muter's 378 

Oiled  Silk   443 

Ointment  Pots   328 

Oldberg's  Percolators    395 

Olmstead's    Mitre    Box 366 

Olsen's   Testing   Machines   for 

Cement    131.  133 

Opaque   Fused   Silica   Arsenic 

Tube    17 

Opaque  Fused  Silica  Capsules  162 
Opaque    Fused    Silica    Carbon 

Flask    247 

Opaque    Fused    Silica    Casse- 
roles       130 


544 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Page 
Opaque  Fused  Silica  Combus- 

tion Boats   ................    162 

Opaque  Fused  Silica  Combus- 

tion Tubes    ................   163 

Opaque  Fused  Silica  Cru- 

cibles   .....................   174 

Opaque  Fused  Silica  Evapo- 

rating Dishes   .............    186 

Opaque  Fused  Silica  Flasks.. 

......................  246,  247 

Opaque  Fused  Silica  Rods...  443 
Opaque  Fused  Silica  Sugar 

Dish   ......................    188 

Opaque  Fused  Silica  Tannin 

Dish     .....................    188 

Opaque  Fused  Silica  Test 

Tubes    .................  163.   488 


Opaque   Fused  Silica  Tubing. 


163.    443 
Optical    Pyrometer,    Scimatco 

421.   422 

Optical    Pyrometer,    Shore's..    422 

Ore  Crushers    175 

Ore   Grinders    176-177 

Ore  Samplers 432.  433 

Ore  Sampling  Pans 433 

Organic    Analysis    Furnace..    261 
Organic   Combustion    Furnace  261 
Organic     Matter     Determina- 
tion  Apparatus    450 

Organic  Matter  Jar 461 

Orsat   Gas   Analysis   Appara- 
tus    277,  279-281 

Orsat   Gas   Bulbs 279.   428 

Orsat-Fischer     Gas     Analysis 

Apparatus    279 

Orsat-Lunge      Gas      Analysis 

Apparatus    279 

Orsat-Muencke    Gas    Analysis 

Apparatus    279 

Osborne's  Lecture  Apparatus.   333 

Osmosemeter    401 

Ostwald  Apparatus    ..396-399,   403 
Ostwald       Calomel       Normal 

Electrode   397 

Ostwald    Capillary   Electrom- 
eter Tubes 399 

Ostwald   Conductivity   Cell...    396 

Ostwald  Gas  Electrodes 398 

Ostwald   Pipettes 403-405,   508 

Ostwald     Pipette     for     Folin 

Apparatus    508 

Ostwald   Toluol   Regulators..    501 
Ostwald  Viscosity  Determina- 
tion Outfit   403 

Outfit   for   Blowpipe   Analysis     94 
Ovens  for  Asphalt  Testing... 

21,   23,   387 

Ovens,   Baking    381.   382 

Ovens,  Constant  Temperature 

383-385 

Ovens,   Drying    383-388 

Oven    for    Melting    Point    of 

Hard  Pitch   21.   23 

Ovens,  Paraffine   Embedding. 

393-395 

Ovens,   Vacuum   Drying 388 

Oven    Thermometer,    Bake... 

255.   493 

Overflow  Pipettes    404 

Oversleeves 14 

Oxone    288 

Oxygen    Bomb    Calorimeters. 

127.   128 

Oxygen      Bomb      Calorimeter. 

Adiabatic 128 

Oxygen    Cylinders    276 

Oxygen  Determination   Appa- 
ratus  277,  279-283.   293,  294 

Oxygen  Flasks   248 

Oxygen   Gas    275 

Oxygen   Gas   Generators.  .288.   427 
Oxygen    Generating    Appara- 
tus   288,   427 

Oxygen  Generating  Retorts.  .    427 

Oxygen   Tanks    275,   288 

Oxygen    Tank    Gages 275 

Oxyhydrogen  Blowpipes   93 

Ozonator,   Electric    389 

Ozone  Apparatus,  Siemen's...    390 
Ozone  Tube   390 


Page 

Palm   Glass    414 

Palm   Oil   Soap 354 

Palmquist    Gas    Analysis   Ap- 
paratus     279 

Pans   for    Balances 61 

Pans,  Baking 263 

Pan    for    Briquettes    (Cement 

Testing)    132 

Pan,  Cement 132 

Pans,   Dissecting    190 

Pan,  Gold  Washing 298 

Pan,    Grain   Sample 302 

Pans,    Incinerating,    Platinum  409 

Pans  for  Ore  Samples 433 

Pans,  Sample   302 

Pans,  Sifting 441,  442 

Pans,   Soil    445,  461.  455 

Pans,  Washing 253.  298 

Pantograph    390 

Paper,   All   Kinds 

17,   95,  96,   169.      • 

185,    202,    228,    230,    238-241, 
329,    333,    337,    361,    380,    390.    391 
Paper,  Adams  Fat  Extracted.    390 
Paper,  Asbestos 17 


Paper.  Blue  Print 


390 


Paper,  Carborundum   ........    390 


Paper,  Congo  Ked 


390 


Paper,  Cross  Section 169 

Paper,  Dialyzing 186 

Paper,  Drawing    202 

Paper,  Drying,  Botanical.  .  .95.   96 

Paper,    Emery    230 

Paper,  Emery,  Metallographic    337 
Paper,  Fat  Extracted  for  Milk 

Analysis    241,  361 

Paper,  Filter   238-241 

Paper,  Glazed   390 

Paper,  Glazed  for  Kymograph  329 


Pads,  Asbestos    17 

Pail   for  Waste 390 

Pails,   Weighing    284 

Palladium  Tube  for  Gas  Anal- 
ysis   290 


Paper,   l_,ens,   Japanese  .......    333 

Paper,  Litmus   ...........  390,   391 

Paper,   Logwood    ............    391 

Paper,  Mounting,  Botanical..      96 
Paper,    Paraffine    ............    391 

Paper,    Parchment    ..........    391 

Paper,  Plant  Description  .....     96 

Paper,  Pole  indicating  .......   228 

Paper,   Pressing,   Botanical.  95,  96 
Paper,    Sand    ................    391 

Paper,  Turmeric    ............    391 

Paper,  Water  Indicating  .....    38U 

Paper,   Wrapping    ...........    391 

Paper  Bags  .................    391 

Paper   Boxes    ............  108,  241 

Paper  Racks  ................   391 

Paper  Scales  ................   435 

Paper    Scale    Thermometers..   496 
Paper  Shears   ...............    440 

Paper   Tester.   Mullen  ........    391 

Paper  Testing  Machines.  .391,   489 
Paper  Thickness  Gages..  .391.   392 
Paraffine  Candles   ...........    507 

Parafnne  Embedding  Baths.. 
......................  392,   393 

Paraffine  Embedding  Box  ----    354 

Paraffine  Embedding  Ovens.. 
.......................  393-395 

Paraffine  Embedding  Table..    354 
Paraffine    Receptacle    for    In- 
cubators   ..................    39i 

Paraffined  Paper   ............    390 

Parallel    Jaw   Clamps  ........    150 

Parallel  Rules   ..............   202 

Parker's   Deflagration   Spoon.    18< 
Parker's  Glass  Cutting  Tool.    295 
Parr  Adiabatic  Calorimeter..   12i 
Parr  Carbon  Apparatus  ......   12( 

Parr   Coal   Calorimeters.  .  .126-128 
Parr   Gas   Calorimeter  ........    283 

Parr  Oxygen  Bomb  Calorime- 
ter ........................    12 

Parr    Standard    Calorimeter..    121 
Parr  Sulphur  Photometer....    121 

Parr   Weighing   Bottle  .......    10' 

Paste,  Library   ..............    334 

Paste,  Soldering    ............   46 

1'aste  Board  Boxes  .......  108.   241 

Pasteur-Chamberland      Filter 
Cylinders   .................    237 

Pasteur  -  Chamberland  Pres- 
sure Filters    ...........  236.   23 

Pasteur   Dishes    .............    18 

Pasteurizing  Outfit   ..........    36 

Pasteurizing  Thermometer   .  .    36 
Pastille  Press    ...........  128.    414 

Pauli's    Calomel    Electrode...    397 
Pauly's  Receiver  ............    426 

Payne's    Platinum    Dish  ......    409 

Pebble   Mills    ............  179,   180 


'eerless      Automatic      Water 

Stills    195 

'eligot        Calcium       Chloride 

Tubes    124 

eligot  Potash  Bulb 413 

ellet    Press    for   Calorimeter 

Work    128,   414 

'ens,  Drawing 202 

'encils,  All  Kinds 202.   395 

'encils,   Drawing    202 

encils,  Litmus   395 

'encils.   Wax    395 

'encil   Brushes    109 

'encil  Compasses   163 

'encil   Sharpener    395 

'enetration   Needle,   Asphalt.      24 
'enetrometers,  All  Kinds.... 

24,   25,   133.   451 

^enetrometers,    Asphalt    ...24.   25 

enetrometer.   Schutte    25 

^enetrometer.  Soil 451 

enetrometer,  Vicat's  for  Ce- 
ment        133 

enfield  Application   Goniom- 
eters  298,  299 

enfield   Contact  Goniometers 

298,   299 

ennock  and  Martin  Crucible   171 
ennock   and  Martin   Sulphur 

Apparatus    171 

Pensky-Martin     Flash     Point 

Tester   376 

ensky-Martin  Oil  Tester....  376 
Dentane  Lamp,  Harcourt....  291 
Pentane  Thermometer  for 

Low  Temperatures 491 

Peptone,   Silk    82 

Pepys-Berzelius  Gas  Holders.  288 
Dercentage  Scale  for  Cement  46 
Percentage  Tube  for  Haemo- 

tokrit   134 

Percolation     Apparatus,     Mc- 

Call's    451 

Percolators    395 

Percolator  Bottles    327 

Percolator  Jars 327 

Perforated  Disks  for  Caldwell 

Crucibles     172 

Perforated     Porcelain     Plates 

for  Funnels    238 

Periodic  System  Chart 144 

Pestle,    Rubber    451 

Petterson-Palmquist   Gas  Ap- 
paratus         279 

Petri  Dishes   181 

Petri     Dish     Covers.     Porous 

Clay    181 

Petri  Dish  Holders 181 

Petroleum     Inspectors'     Man- 
ual        377 

Petroleum   Testers    373-380 

Petrological   Collections.  .364,   365 

Phenol  Tube 259 

Phenol-Sulphone    -    Phthalein 

Ampoules    156 

Phillips   Beakers    246 

Phosphor    Bronze    Ribbon....    525 

Phosphor  Bronze   Sheet 525 

Phosphorescent  Minerals    .  .  ..   426 
Phosphoric  Acid  Flask,  Volu- 
metric        250 

Phosphorus         Determination 

Apparatus    134-141,   248,   427 

Phosphorus    Electric     Centri- 
fuges    135-141 

Phosphorus    Flasks    248 

Phosphorus       Tubes.       Blair's 

Reductor    427 

Phosphorus   Tubes,   Goetz.135.   141 

Photographic    Trays    504 

Photometers  and  Accessories. 

126,  155,  290.  291 

Photometers.    Gas    290.   291 

Photometer,  Hess-Ives   155 

Photometer,    Sulphur,    Parr...   126 

Photometer   Sight-Box    290 

Photometer    Standard    Incan- 
descent Lamp 331 

Photometric  Candles 292 

Physical  Balances.  ...44,  49,  61-55 
Physical    Chemistry    Appara- 
tus     396-403 

Physiological      and       Clinical 

Apparatus    82-87 

Piano    Wire    522 

Picks,   Mining    303 

Pincnometers 24.    104.    105 

Picture    Wire    522 

Pill  Boxes    108 

Pillsbury    Boxes    349 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


545 


Paee 

Pilot  Flame  Burner 113 

Pins,   Insect    326 

Pins,   Ordinary    404 

Pincers    256 

Pinch  Clamps   147 

Plnchcocks.   Mohr's    147 

Pinning   Forceps    2 

Pioscope,  Heeren's 362 

Pipe,    Block   Tin 526 

Pipes.   Clay   404 

Pipe.  Lead    370.  625 

Pipe   Stem    Triangles 503.   504 

Pipe   Wrench.   Stillson's 523 

Pipettes.    All    Kinds 

85,  87,  107.  134,  279.  293. 

294,    366,    362,    404-406.    475.    508 

Pipette,  Acid.  Automatic 356 

Pipettes.   Automatic    87.  404 

Pipettes,   Blood.   Wright's....      87 

Pipettes.   Blood   Counting 85 

Pipette  for  Centrifuge 134 

Pipettes,  Certified    406 

Pipette,  Comer's  Automatic.  . 

87.   404 

Pipettes,   Dropping    87.   404 

Pipettes,   Explosion    293.   294 

Pipettes,  Gas 293.   294 

Pipette,    Glucose    404.   476 

Pipettes,    Haemacytometer. .  .     86 

Pipettes,   Mercury    405 

Pipettes,  Milk,  Babcock 362 

Pipettes,   Orsat    279 

Pipette,  Ostwald  Calibrating.   404 
Pipette,     Ostwald     for     Folin 

Apparatus     508 

Pipette.  Ostwald   Viscosity...    403 

Pipettes,  Serological    405 

Pipettes.    Sugar    404.  475 

Pipettes,  Transfer   405 

Pipettes.  Viscosity   403 

Pipettes,  Volumetric    405 

Pipettes,   Weighing    107 

Pipette   Bottle    406 

Pipette  Boxes 406 

Pipette   Brush    109 

Pipette  Electrode 397 

Pipette  Rest 406 

Pipette  Support    406 

Pitch  Molds   22.   23 

Pitch  Testers    18-25 

Pitchers.  Acid    9 

Pitot   Tube    272 

Planes    406 

Plant   Bell   Jars 79.   80 

Plant  Description   Paper 96 

Plant  Physiology  Apparatus..    407 

Plant  Presses    95.   96 

Plantamour's  Hot  Water  Fun- 
nels        258 

Plasticity  Apparatus 451 

Plates.    All    Kinds 16. 

94.  132,  168.  169.  175.  181. 
185.  203,  238.  253,  255,  299, 
300.  306.  308-310,  407,  408,  416 

Plates  for  Air  Pumps 416 

Plate.   Arsenic    16 

Plates.   Beaker   Covers 407 

Plate.  Cement    132 

Plate.  Color  Reaction 408 

Plates.   Colored   Glass 408 

Plates,  Cork    168 

Plates.    Counting   Bacteria... 

.168.   169 


Plates,  Crushing   175 

Plates   for  Desiccators 185 

Plate.   Draw    203 

Plates,   Germinating   299.  300 

Plate.  Glass,  for  Cement 132 

Plate.   Glass,  for  Slick  Test..    253 

Plate.  Gluten    255 

Plates.    Hot.    Electric. 306.   308-310 
Plates,  Hot.  with  Flask  Heat- 
er        306 

Plates.   Hot.    Gas 117.  310 

Plates,    Perforated,    Porcelain 

for   Funnels    238 

Plates,  Petri,  Culture... 181 

Plates.  Porcelain 185.   238.   253 

Plates,   Porous    299.   408 

Plates,  Streak   17.  94 

Plates,    Suberlte    168 

Plates.  Zinc   255 

Plate   Glass   Plates 132.   407 

Plate   Rheostats    226 

Plate  and  Rubber.  Iron 175 

Platinoid  Wire   522 

Platinum  Wire   

93.  256.  408-411.  502 

Platinum    Blowpipe  Tips 93 

Platinum    Crucibles    408,   409 


Page 

Platinum  Electrodes    SSI.  410 

Platinum   Electrode   Dishes..   409 

Platinum   Forceps    94.  256 

Platinum  Holders 326 

Platinum  Needles 386 

Platinum   Weights    55-57 

Platinum-Rhodium  Couples  for 

Brown  Pyrometers 420 

Platinum    Thermo-Couples.  . .    420 
Platinum    Tipped    Forceps. 94.   256 

Platinum   Tipped   Tongs 502 

Platinum  Wire   for  BIowplp- 

ing    94.   411 

Plattner  Blowpipes    93 

Plattner  Blowpipe  Apparatus 

93.  94 

Plattner  Diamond  Mortar. . . .    366 

Plattner  Hammer 94 

Plattner  Scale   94 

Pliers   411.  412 

Plotting  Paper 169 

Pings   for   Electrical   Connec- 
tions     227.  228 

Plugs.    Fuse    227 

Plumb  Bob.  Iron 412 

Plumbago   Crucibles    172 

Plunge  Batteries 69 

Pneumatic  Troughs 506 

Pocket    Ammeters   and   Volt- 
meters        209 

Pocket    Carrying    Case.    Hy- 
drometer        314 

Pocket  Flash  Lamp 331 

Pocket   Hand   Book   of  Blow- 
pipe Analysis   94 

Pocket  Knives   329 

Pocket  Level.  Brass 333 

Pocket  Magnifiers   334.   336 

Pocket  Rules 432.   436 

Pocket  Screw  Driver 437 

Pocket    Thermometers 

492.   494.   497 

Polar.  Cenco-,  Water  Stills.. 

196.   197 

Polar  Co-ordinate  Paper 169 

Polarity  Indicators  228 

Policemen.  Rubber 429 

Polisher  for  Metal  Specimens   337 
Polishing    and    Grinding    Ma- 
chines      336.   337 

Polishing  Heads 412.  413 

Polishing  Material    

?3fl.    336-338,    368.    390.    412.    413 
Polishing  Wheels.   Felt... 412.   413 

Porcelain    Acid  -Dishes 185 

Porcelain  Arsenic  Plate 16 

'Porcelain    Rail    Mills 179.180 

Po-velain   Rails   for  Mills 180 

,  Porcelain   Beakers    78 

Porcelain    Bowl     107.253 

Porcelain   Burner    114 

Porcelain   Capsules. .  .129.   162.  187 
Porcelain    Casseroles    ....129.   130 
Porcelain  Combustion  Boats..    161 
Porcelain     Combustion     Cap- 
sules     129.   162 

Porcelain  Combustion  Tubes.    1S3 

Porcelain  Cones   238 

Porcelain    Crucibles.  .  .20.   172.   173 

Porcelain  (^ups   253.   484 

Porcelain  Desiccator  Plates.  .    185 
Porcelain  Evaporating  Dishes 

186.   187 

Porcelain  Filter  Cones 238 

Porcelain   Filter  Cvllnders...    238 

Porcelain   Filter  Disks 238 

Porcelain  Filter  Flasks 237 

Porcelain   Funnels    258 

Porcelain  Jars  for  Ball  Mills. 

179.   180 

Porcelain    Mills     179.180 

Porcelain    Mortars    367 

Porcelain   Pipette  Rest 406 

Porcelain  Plates.  1S5.  238.  253.  408 
Porcelain  Plate  for  Color  Re- 
actions        408 

Porcelain  Plates  for  Desicca- 
tors        1«5 

Porcelain  Plates  for  F""nels.    23S 
Porcelain    Pyrometer   Tubes.. .421 

Porcelain    Rings    428 

Porcelain  Soatulas 461 

Porcelain   Spoons    462 

Porcelain   Swimming  Cups...    484 

Porcelain  Tubes 163.  421 

Porous  Covers  for  Petri  Dishes  181 

Porous   Cups,   Battery 6fl.   68 

Porous  CUDS  or  Cells 66.   68 

Porous   Filters    237.   238 

Porous  Plates   408 


Page 

Portable  Ammeters  and  Volt- 
meters      209-212 

Portable  Electric  Testing  Set  2 
Portable  Galvanometers    ....   206 
Porter's   Electric   Motors.....  214 

Posts,  Binding 75 

Potash  Bulbs 413.   414 

Potato  Culture  Tubes 488 

Potato  Cutter.  Ravenel 414 

Potentiometers   222.   223 

Pots,  Acid   9 

Pouring  Molds 366 

Power  Mills  and  Grinders... 

175-181 

Power    Sieve    Shakers.  ..  .442.  443 

Precipitating   Jars    327 

Precision   Burettes    112.   113 

Precision   Flasks.  Volumetric  250 

Precision  Graduates   183 

Precision  Hydrometers   ...311-31 

Precision  Microtome   353 

Precision   Mixing  Cylinders..   183 

Precision   Pipettes    406 

Precision    Thermometers.  .491-^95 

Precision  Urlnometers   510 

Preparation   Dishes    188 

Preparation    Jars    326-328 

Prescription  Balances   

39.  40.  42.  43.  47.  51.  S4 

Prescription   Weights    

Preservation    Jars    326-328 

Press  for  Calorimeter  Work. 

128.   414 

Press.  Filter 248 

Presses.  Flower 95.  96 

Press  for  Herbs 414 

Press.  Laboratory 414 

Press.    Pastille    128.   414 

Pr»ss.   Pellet  for   Calorimeter 

Work     128.   414 

Presses.    Plant    95.  9S 

Press.   Tincture    414 

Pressing  Paper.  Botanical.  .95.  96 

Pressure  Blowers 89-9? 

Pressure  Bottles 100 

Pressure  Cookers.  Sterilizers  28 
Pressure  Filter  Apparatus... 

236.   ?37 

Pressure  Oages   272-27 

Pressure   Gas   Bags 282 

Pressure  Pumps.  .  .89-92.  414.  424 
Pressure  Regulators.  Gas.... 

28.  274,  276.  284.  294.  501 

Pressure   Regulator.   Gas.   for 

Thermo-Regulators    294 

Pressure  Sterilizers    26-29 

Pressure    Tanks     90,   92.   414 

Pressure    Tube.    Osmotic 401 

Pressure    Tubing    431 

Primarv   Batteries    66-70 

Prince  Rupert's  Drops 4 

Probang 110 

Probes    193 

Proofing  Cabinets   ?! 

Prospectors'  Hammers   ....94.  303 
Protecting  Cases  for  Pyrome- 
ters    419.   420 

Protecting  Pyrometer  Tubes. 

420.  421 

Protractor     and     Goniometer. 

Penfield   298 

P=vf-hrom"ters.  Sline    317 

Pudding  Trav  for  Soils 4K7 

Pukal.    Filter   Balloon 237 

Pulleys  on  Support  for  Trans- 
mission        216 

Pulp   Balances    39.   40 

Pulse   or   Palm    Glass 414 

Pulverizers    17S-181 

Pulverizing.       Grinding      and 
Crushing   Apparatus    ...175-181 

Pumns.   All  Kinds 

..9.   89-0'.   242.   243.   414-416.   424 

Pumps.  Acid   9 

Pum^s.   Air.  Mechanical. 89-91.   414 

Pumps.   Blast    89-9? 

Pumps.  Compression  for  Gases   414 

Pumps.   Filter 242.   243 

Pumps.'  "Pressure.  .89-92.  414.  424 
Pumns.  R'iction.  .242.  243.  414-416 
Pumps.  Suction  and  Pressure 

89-92,   414.   424 

Pumps.    Vacuiiti    

89-92.  24?    243,  414-416.  424 

Pumns.   Water  P.last 99. 

Pumps.  Water  Filter 242.   243 

Pump    Oil     416 

I  Pump  Platf-s.    Air 416 

i  Purlnometer,  Hall's 508 


546 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Push     Buttons     for     Electric 

Bells 81 

Pycnometers    24,   104,   105 

Pyrex        Glass        Combustion 

Tubes   163.   297 

Pyrex  Glass  Combustion  Tub- 
ing       297 

Pyrex  Glass  Flasks 244-249 

Pyrex   Glass   Test  Tubes 488 

Pyrometers,   All   Kinds.  ..  .417-423 
Pyroscope,  Shore's  Pyrometer  422 


Quadrant   483 

Quadruple  Microscope   Lamp.  347 

Qualitative  Filters 238-240 

Quantitative  Filters 240.  241 

Quartz   Apparatus,  Transpar- 
ent      17,   78,   162. 

163,    173,    187,    249.    421.    42R.  488 

Quartz   Arsenic   Tube 17 

Quartz  Beakers   78 

Quartz  Combustion  Boats.  .  .  .  162 

Quartz    Combustion    Tubes.    .  163 

Quartz  Crucibles    173 

Quartz   Dishes    187 

Quartz  Flasks    249 

Quartz  Laboratory  Utensils.. 

78.   162. 

163,    173,    187,    249.    421.    428.  488 

Quartz,  Pyrometer  Tubes 421 

Quartz   Retorts    428 

Quartz  Test  Tubes 488 

Quartz   Triangles    505 

Quartz   Tubes    163,  488 

Quevenne    Lactometers     (Hy- 
drometer)      '.  .  313 

Quill   Handle   Brushes 109 

Quinine  Bottles   97 

Qulxo   Cement    130 


R.   R.   Alundum 162 

Racks,   All  Kinds 

243,   350,    362. 

391,    476.    477,    479-481,    517,    519 

Racks,   Filter   243 

Racks,  Paper    391 

Racks  for  Soil  Tubes 460 

Racks  for  Staining  Slides...  350 
Rack  for  Sulphur  Apparatus.  476 

Racks   for  Test  Bottles 362 

Racks   for   Test   Tubes 

480,  481.  517.  519 

Radial  Burners,  Fletcher....  116 
Radiation  Pyrometers, 

Thwlng    422.   423 

Radio-Active  Apparatus.  .423-426 
Radio-Active  Minerals...  .425.  426 
Radio-Chemistry  Apparatus.. 

423-426 

Radio   Microscope    Lamps....    345 

Radiometer    426 

Radioscope    426 

Radium  Apparatus 423-426 

Radium    Electroscopes    ...423-425 

Radium    Sninthariscope    426 

Rafter's    Counting    Apparatus   520 

Rain   Gages    273 

Rake,   Cupel    182 

Ralston's   Still    195 

Rammer   for   Briquettes    (Ce- 
ment Testing)    133 

Rare  Metal   Pyrometers.  .  .417-419 

Rat  Tail  Files 235 

Ratchet   Screw    Driver 437 

Rauvier's  Dropping  Bottles.  99 
Ravenel  Culture  Dish  Holder  181 

Ravenel  Potato  Cutter 414 

Raw  Materials    524-526 

Rawhide  Mallet 335 

Razors.   Section    355 

Razor   Strops    355 

Reaction  Plate 408 

Reader  for  Burette  Meniscus.    113 
Reading     Devices     for     Ther- 
mometers     126,    284.    500 

Reading   Glasses    61.   335 

Reading  Glass  for  Balances.  .  61 
Reading  Lenses  for  Colony 

Counting   168.   169 

Reading  Lens,   Thermometer. 

126.   500 

Reagents     for     Abderhalden's 

Dialyzlng  Method   82 

Reagents   for   Rlowpipiner.  ...      94 
Reagents   for  Kuttner  Micro- 
Colorimeter    156,   167 


Page 

Reagent   Bottles    101-103 

Reagent   Bottle  Caps 102 

Recalescence  Point  Apparatus 

263,   271,   417-422 

Receivers   for  Air  Pumps.... 

79,  80,  90,  92.  414 

Receivers,    Bell    Glass 79.   80 

Receivers      and      Covers      for 

Sieves     441.  442 

Receiver    for    Distillation     in 

Vacuum    426 

Receiver,   Paulv's    426 

Receivers  for  Pressure  Blow- 
ers     90,  92.  414 

Receivers  for  Retorts 426 

Receptacles       for       Electrical 

Connections    228 

Reckoner,   Nomon    373 

Record  Charts  for  Milk 358 

Recorder  for  Sunshine 476 

Recorders,    Temperature    .... 

419.   498.  499 

Recording  Barometer    65 

Recording  Drum    329 

Recording  Pyrometers    419 

Recording  Thermometers. 498.  499 

Rectifiers,    Electric    219 

Red    Fiber    Blocks 354 

Red  Rubber  Tubing 430.  431 

Reducer,   Brass    506 

Reducing  Gages    274,  275 

Reducing   Gear    216 

Reduction  Factors  for  Gas.  .  .  284 

Reduction  Tubes 427 

Reductors.    Blair's    427 

Reed's  Extraction   Apparatus.  231 

Referees'   Gas   Apparatus.  .11.  282 

Reflecting  Level.    Hand 482 

Reflux  Condensers    165 

Refractory   Cement.   Alundum  130 

Registering  Hygrometer    ....  317 
Registering    Thermometers... 

495.    497-499 

Regulators,   Electric    

318,    320.    500-502 

Regulator.      Gas      for      Auto- 
claves      28 

Regulators,   Gas  Pressure....  294 

Regulators,  Gas  Tank.... 274.  275 

Regulator.    Gas    Time 294 

Ree-ulators.    Pressure    for  Gas 

Cylinders     274.  275 

Regulators.   Temperature, 

Electric 318,   320,   500.  501 

Regulators,  Tolul    501 

Reichert  Gas  Regulators 501 

Reichert  Thermo-Regula  tors.  501 

Reimann's  Thermometer  Bodv  51 
Relay.        DeKhotinsky       Iron 

Clad   500 

Renal   Functional   Apparatus.  156 

Rennet    Tester.    Marschall .  .  .  .  362 

Repairs    for    Galvanometers.  .  207 

Repairs  for  Milk  Testers 361 

Reservoir  for  Pressure  Ttlow- 

er    90.   92.  414 

Resistances.   Cenco    224 

Resistances,  Dodge   226 

Resistances.  Non-Inductive   .  .  227 

Resistances.   Standard    223 

Resistance   Poxes    220-222 

Resistance   Bridges    

222,   223,   403,  455 

Resistance    Coils    223 

Resistance   of  Metals  Table..  528 

Resistance   Spools    223 

Resistance  Wire    522 

Resistance  of  Wire  Table.  .  .  .  527 

Respirators    427 

Rests   for   Balances 61 

Rests  for  Bottles 107 

Rests  for  Pipettes 406 

Retention    Cur,.   Water 460 

Retorts,    All    Kinds 

25.   174.   198.  199.   427.  428 

Retort  for  Creosote  Oil  Distil- 
lation      25 

Retorts.  Glpss    427 

Retorts,  Kkidmore's   174 

Retorts.  Transparent  Quartz.  428 

Retort   Adapters    9 

Retort  Clamps    146 

"Retort   Connectors    9 

Retort  Receivers    426 

Retort  Rings    428 

Retort  Stands    477 

Retort   Supports    477 

Revolution   Counters    

135,   138.    141,    462.  474 

Revolving  Nosepleces    348 


Page 

Rheostats     

..214,   224-226,  260.  263,   266.  346 

Rheostats,  Battery 214 

Rheostats    for    Electric    Fur- 
naces     260.   263.    266 

Rheostats      for      Micro      Arc 

Lamps    346 

Ribbed  Funnels   257 

Ribbon,     Galvanometer     Sus- 
pension      207 

Ribbon     Carrier     for     Micro- 
tomes    353 

Richards  Filter  Pumps 242 

Richmond  Slide  Rule 363 

Rickard's  Sputum  Shaker....    439 

Riders   for   Balances 56 

Rider  Weights    51.   56 

Riffle  Samplers    432.   433 

Right  Angle  Clamps 148-150 

Riker   Botanical    Mounts 95 

Riker  Plant  Press 96 

Rlker  Specimen  Mounts 461 

Rings,   Concentric    428 

Rings,   Copper    428 

Rings,  Filter   19 

Rings,  Iron   428 

Rings  for  Micro  Slides 34fl 

Rings,  Porcelain   428 

Rings,  Retort 428 

Rings.  Suberlte   168 

Rings   for  Supports 428 

Ring  Burners    20,   118 

Ring  Supports   477 

Rip  Saw   434 

Ripper's   Weighing   Burette..    112 

Road   Material   Testers 18-25 

Roasting  Dishes    188 

Rock   Crushers    175 

Rock  Crystal   Apparatus 

..162,  163.  173,  187,  249.  428.  488 
Rock  Grinders.  .  .176,   177,  179-181 

Rod,  Carbon    524 

Rod,     Charging    for    Electro- 
scopes       424 

Rod,  Fiber 525 

Rods,   Gage   for   Oil 377 

Rod,  Glass 29fi 

Rod,   Metal,   All   Kinds 524-526 

Rod,  Rubber 626 

Rods,    Silica    443 

Rods,    Stirring    of   Glass.. 296,   470 

Rods.    Stirring,    Nafls' 357.   363 

Rod   Clamp    403 

Rod  Table,  Weight  of 528 

Roehrig   Extraction   Tube. 233.   358 

Roger's    Ring   Burner 118 

Roger's  Sphygmomanometer..      87 

Rolling    Mills    180.   181 

Rope,  Manila   428 

Rorrison    Oil    Thief 379 

Rose  Crucibles 173 

Rose   Top    (Crown)    for    Bun- 

sen  Burner 123 

Rosettes   228 

Ro-Tap   Sieve  Shaker 443 

Rotarex,  Dulln    19 

Rotary  Air  Pumps    89-91 

Rotary   Compressors    89-91 

Rotary  Converters    226 

Rotary  Microtomes.  Spencer's 

.  ..  .' 352.    353 

Rotating   Anode   and   Stirring 

Apparatus    229 

Rotators,   Electric    229,   470 

Rothe  Double  Automatic  Pip- 
ette        404 

Round   Levels    333.   334 

Roux  Culture  Tube 48S 

Roux  Gas  Regulator 501 

Roux   Thermo-Regulator.    Bi- 
metallic      501 

R.   R.   Alundum 162 

Rubber   Bags 279.    282.    428 

Rubber  Balloons   63 

Rubber  Bands    428 

Rubber    Battery    Syringe.. 71.    313 
Rubber    Block    for    Platinum 

Combustion   Boats    40S 

Rubber  Bottles   103 

Rubber   Bottle   Rests 107 

Rubber  Bulbs 88,  279,  428 

Rubber    Bulbs     for    Constant 

Blast   88 

Rubber    Bulbs    for    Dropping 

Bottles    428 

Rubber  Bulbs   for  Gas   Appa- 
ratus     279.    428 

Rubber    Bulb    Expander 431 

Rubber  Caps  for  Test  Tubes.    428 
Rubber  Cloth  Aprons 14 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


547 


Page 
Rubber  Cloth  Balance  Covers     61 

Rubber  Cloth   Sleeves 14 

Rubber   Covered    Wire 521 

Rubber   Crucible   Holders 174 

Rubber  Dam 429 

Rubber  Disks  for  Foot  Blow- 
ers          88 

Rubber     Extraction     Appara- 
tus        231 

Rubber   Finger   Cots 243 

Rubber   Funnels    258 


Rubber  Gas  Bags 279,  282.  428 


Gaskets     for     Filter 


237 


Rubber 
Cones 
Rubber     Gasket     for     Filter 

Dish     238 

Rubber  Gloves    297.  298 

Rubber   Goggles    298 

Rubber  Goods    428-431 

Rubber  Hose   430.  431 

Rubber   Pestle    451 

Rubber   Policemen    429 

Rubber   Rod    526 

Rubber  Scraper 429 

Rubber   Sheet    429.  526 

Rubber  Sheet  for  Bellows....  88 
Rubber  Sheet  Covers  for  Bal- 
ances     -61 

Rubber    Spatulas    481 

Rubber  Sprinklers    463 

Rubber  Stoppers 103,  301.  429 

Rubber  Stoppers  for  Moisture 

Testers    301 

Rubber    Stoppers    for    Serum 

and   Vaccine  Bottles 103 

Rubber  Testing  Machine 489 

Rubber  Tips  for  Glass   Rods.  429 

Rubber  Tissue    429 

Rubber   Tube   Expander 431 

Rubber  Tubing,  All  Kinds 

430,   431.  526 

Rubber   Tubing  Stretcher....  431 

Ruby  Glass  Plates 408 

Rudolf  Coagulometer    83 

RuedorfTs  Gas  Apparatus. . . .  282 

Ruhemann's    Uricometer    ....  509 

Ruhmkorff    Induction    Coils..  208 
Ruhstrat  Type   Rheostats... 
Rules,  English  and  Metric... 


Page 

Sampler,    Milling   Machine 160 

Sampler   and   Scoop 432 

Sampling   Bulbs   for  Gas  Ap- 
paratus     279.  428 

Sampling   Cloth    433.  454 

Sampling  Dishes 433 

Sampling  Machine    160 

Sampling  Mailing  Cases.. 254.  335 

Sampling  Pans 302,  433.  461 

Sampling  Scoops    432.  435 

Sampling  Shovels 432.  435 


Sampling   Tray    432 

Sampling  Tubes. 286,  453,  454.  457 

Sampling  Tube  Brush 453 

Sand,    Berkshire    620 

Sand,  Sea    438 

Sand,    Standard,    for    Cement 

Testing 132 

Sand  Baths   433.   434 

Sand   Crucibles    173 

Sand  Glasses    434 

Sand  Paper 391 

Sand  Scale   46 

Sand   Sieves    441 

Sand   Thermometers    492 

Saponification     Flask.     Volu- 
metric       250 

Sargent    Automatic    Gas    Ca- 
lorimeter       284 

Saucepans    130 

Saws,  All  Kinds. 190.  337,  412.  434 

Saw,    Automatic    Hack 337 

Saw,  Bone   190 

Saw,    Circular    412 

Saw,   Crosscut    434 

Saws,   Hack    337    434 

Saw,   Rip    434 

Saybolt  Universal  Viscosime- 

ter    380 

Scales,   All  Kinds 436 

Scale,    Bakers'     64.  252 

Scale,   Cement    46 

Scale   of  Hardness 94 

Scales,   Measuring,    for  Hard- 
ness   Tester    304 

I  Scales.  Percentage. .  .41,  42,  46.  49 

09.     Scale,   Planner's    94 

Scale,  Seed  or  Grain 300 


Rules,  Parallel   202 

Rule,  Richmond  Slide 363 

Rules,  Slide 363,  432.  444 

Ruled  Counting  Plates.  .  .168.   169 
Rupert's  Drops    432 


Saecharimeters,  Polariscopes.  412 

Saccharometers     315.  509 

Saccharometer,  Balling's   ....  316 

Saccharometers,   Brix    315 

Saccharometer,   Elnhorn's    .  . .  509 

Saccharometers,  Fermentation  509 

Saccharometers,  Hydrometers  315 

Saccharometer.    Lohnstein's.  .  509 

Saccharometrie    Flasks.  .  .250.  475 

Safety   Burners,   Koch 114.  115 

Safety   La'mp.    Davy's 332 

Safety  Matches 335 

Safety  Pipettes    405 

Safety  Tubes    259 

Sahli  Haemometer   85 

Salinometers    313.  314 

Salleron's  'Distilling   Appara- 
tus      199 

Salleron's   Ebulliometer    204 

Salometers    313,  314 

Salt  Hydrometers   314 

Salt  Mouthed  Bottles 

97.  98,  101.  102 

Salt  Tester  for  Butter 363 

Sample  Bottles.  .100.  103,   105.  106 

Sample  Bottles  for  Oil 100 

Sample   Bottles   for   Water...  106 

Sample    Boxes    20 

Sample  Cans  for  Cement 108 

Sample  Carrying  Outfit 454 

Sample  Grinders.  Braun 176 


VlV    43S  i  Scale,  Slide,  for  Milk.363,   432,  444 

*       7"*T  Sj,  .-lie.          T^vlnnmil*.**  -I  ..  O 


Si-ale,  Triangular    203 

Scale,  Turbidity    159.  507 

Scale  Pan  Brushes 109 

Scalpels    191 

Scheibler  Desiccators    184 

Schellbach   Burettes 111.   112 

Schellbach   Support    477 

Schiff's  Burette   ".  . .    372 

SchifFs  Nitrometer    372 

Schonjahn  Grain  Germinator.    300 

Schreiner's  Colorimeter    159 

Schroedter  Alkallmeter   129 

Schroedter     Carbon     Dioxide 

Apparatus    129 

Schultz  Wassermann  Bath...  519 
Schumann  Cement  Bottle....  105 
Schumann  Specific  Gravity 

Bottle    105 

Schuster  Dropping  Bottle....      99 

Schutte  Penetrometer    25 

Schwartz     Calcium      Chloride 

Tubes    124 

Scimatco  Burner 119 

S  imatco   Optical    Pyrometer.    421 

Scissors,    Dissecting    192 

Scissors.  Shears    440 

Screw      Adjustment      Support 

Clamp   151 

Screw  Compressor  Clamps...    148 

Screw  Drivers    437 

Scleroscope    305 

Scoops,  All  Kinds.. 61,  62,  432,  435 

Scoops,  Agateware 435 

Scoops.    Aluminum     for    Bal- 
ances         61 

Scoop,  Cope  Weighing 62 

Scoops    with    Counterpoise.  .  . 

54,  61,  62.  252 

Scoops,  German  Silver  Weigh- 
ing          62 

Scoops,  Glass  Weighing 62 


Sample  Jars 105,  327.  328  Scoops.  Horn 435 

Sample  Oil  Bottles 100  Scoop,  Nickel  Weighing 62 

Sample  Pans  302.  433  Scoops.  Weighing  61.  62 

Sample  Polishing  Machines.  .  j  Score  Cards  363 

.337.  338  Scoriflers  436 

435 

435 


Sample  Shovels    432. 

Samplers 302.   432,  433. 


Samplers.   Bag 


302 


Scorifler   Molds    366 

Scorifier  Tongs   503 


Sampler,  Cement    432 

Samplers.   Grain  and   Seed....    302 


Scott  Glue  Tester 298 

Scott   Oil   Tester 380 

Scott  Viscosimeter 380 


Scrapers,  Muffle   435 

Scrapers,  Rubber  for  Beakers  429 

Screws,  All  Kinds 75.  334.  436 

Screws,   Binding    75 

Screws.  Cork   168 

Screws,  Leveling 334 

Screw  Calipers 126 

Screw  Cap  Jars 105    328 

Screw  Capped  Bottles .... 

_ • 103,    105,   328.   357 

Screw  Compressors  for  Rub- 
ber Tubing   i4g 

Screw  Dies 436.  437 

Screw   Die   Stocks 436    437 

Screw  Drivers   437 

Screw  Eyes    '   437 

Screw  Hooks   '  438 

Screw  Pitch  Gage 

Screw  Taps 438 

Screw  Tap  Wrench .   438 

Sea  Sand   438 

Sealing  Tubing  of  Glass 297 

Sealing  Wax   

Seco  Cork  Gage .'  168 

Section  Knives   351    355 

Section  Lifters   193 

Section   Razors    355 

Sectional  Capillarity  Tubes..  458 
Sedgwick-Rafter  Apparatus  .  5">0 

Sedgwick-Rafter  Funnel 520 

Sediment  Glasses    487 

Sediment  Tester  for  Milk...      363 
Sediment    Tubes    for    Centri- 
fuges.134,  135,  138,  140.  141.  374 

Seekers    193 

Selenium  Cells "  438 

Self  Registering  Measure 125 

Separating  Device  for  Grain.    302 
Separatory  Funnels   ..20,  258.  259 
Separatory  Funnel  for  Creo- 
sote              20 

Separatory  Funnel  for  Tar. . .  20 
Serological  Apparatus  .... 

82-87,   405.    484-486,    488.   617-519 

Serological   Pipettes    405 

Serological   Syringes    484-486 

Serological    Test   Tubes 488 

Serological    Test    Tube    Sup- 

„  Ports 480,  481.  517.  519 

Serological  Water  Baths. 517-519 
Serraflnes  (Artery  Forceps)..  189 

Serum  Bottles   103 

Serum  Bottle  Stoppers 103 

Serum   Drying  Apparatus ....      83 

Serum   Filters   236-'38 

Serum   Ovens    83 

Sets  of  Blowpipe  Reagents..     94 
Sets     of     Dissecting     Instru- 
ments      194 

Set    of   Pure    Resistances   for 

Electrolytic   Work    223 

Sets   of   Tools 503    504 

Sextant 433 

Shades  of  Glass. . .  .79.  80,  114  145 
Shafts,  Counter,  for  Motors  '16 

Shaking  Apparatus    

•  •  ••  •  •  -438-440.  442.  443.  454.  455 

Shaking  Apparatus  for  Sieves 

••• 442.  443 

Shaking  Funnels   258    259 

Shaking  Machines   . 

„,_ 438-440,  442,  443,  454.  455 

Sharpener  for   Cork   Borers       167 
Sharpener   for   Pencils....          395 
Sharpies       Centrifugal       Ma- 
chines      142.  143 

Shaver  for  Bagasse 17.q 

Shaver  for  Ice 317 

Shears.   AH   Kinds 193    440 

Shears,   Cartilage    193 

Shears.   Paper   440 

Shears.   Tinners'   Snips.  440 

Sheet  Carbon    594 

Sheet  Cork    leg 

Sheet  Fiber 

Sheet  Metal.  All  Kinds 524-526 

Sheet  Metal  Table,  Weight  of  528 

Sheet  Rubber 88,  429    5'6 

Sheet  Rubber  for  Bellows.  .  88 
Shelves,  Digesting.  KJeldahl. 

-•-.....  ^fiQ    ^**1 

Shelf  for  Pneumatic  Troughs  506 

Shells.   Extraction    232    233 

Shell   Vials    .    103 

Shelter,   Meterological    .  338 

Shields   for  Centrifuge   Tubes 
,,.•.••••••-•••135,  138.  140.  141.  374 

Shields  for  Combustion  Boats  16' 
Shimer's  Platinum  Crucible..  409 
Sho-Gro  Germination  Testers  300 


548 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


Shore's  Hardness  Tester 306 

Shore's  Pyrometers    422 

Shot,   Lead    332 

Shovel,  Cupel   182 

Shovels,  Sample   432,   435 

Show   Bottles    104 

Shrinkage  Apparatus,   Soil...    455 
Shunts       for       Demonstration 

Galvanometers    213 

Shunts   for   Galvanometers...    206 
Shuster  Dropping  Bottles....      99 

Side   Neck   Flasks 246.   247 

Slemen's  Ozone  Apparatus...   390 

Siemen's   Ozone   Tube 390 

Sieves,  All  Kinds 302,   440-442 

Sieve   Bolting  Cloth 255.  441 

Sieve   Frames    255.   441 

Sieve  Shakers   442.   443 

Sieve  Sifting  Machines.  .  .442.  443 

Sifter,   Lightning    443 

Sifting  Pans    441,  442 

Sight-Boxes,  Photometer 290 

Sight  Compasses    164,  482 

Signal   Marker    501 

Silica  Beakers   78 

Silica   Boats    162 

Silica   Capsules    162 

Silica  Casseroles  130 

Silica  Combustion  Boats 162 

Silica    Combustion    Tubes 163 

Silica  Crucibles  174 

Silica  Dishes    186.   188 

Silica  Distilling   Flasks 246 

Silica   Evaporating   Dishes...    186 

Silica   Flasks    246,   247.   249 

Silica  Muffles   367 

Silica   Rods    443 

Silica  Test  Tubes 488 

Silica   Triangles    505 

Silica  Tubes    163 

Silica    Tubing    443 

Silk.  Oiled   443 

Silk   Bolting   Cloth 255.  441 

Silk  Fish  Line 165 

Silk  Peptone    82 

Silk  Thread 501 

Silver  Crucibles    174 

Silver  Dishes   188 

Silver   Foil    94 

Simpler  Ore  Crushers 176 

Simplified  Rotary  Microtome. 

Spencer's    352 

Single    Wall    Incubators,     De 

Khotinsky     319 

Siphons     443 

Siphon   Gages    272 

Siphon   Slide,   Holman's 349 

Siphon   Tubes   for    Extraction 

Work     230-232 

Six's  Maximum  and  Minimum 

Thermometer   495 

Skidmore's  Crucibles    174 

Skidmore's   Retorts    174 

Skim  Milk  Bottles 367 

Skins,   Chamois    144 

Skin,   Goldbeaters'    298 

Sleeves    14 

Slick.  Flour   252 

Slides,   Culture    349 

Slides,   Current    349 

Slides,  Microscopical   348,   349 

Slides,    Object    348.349 

Slide  Boxes  for  Micro  Slides.    349 
Slide  Box  for  Tar  Testing...      26 

Slide  Cabinet    349 

Slide     Carriers     for     Staining 

Apparatus    464 

Slide  Cover  Glasses 350 

Slide    Forceps    256 

Slide   Holders    '..   350 

Slide   Labels    330.   350 

Slide  Mailing  Cases 350 

Slide  Mounting  Cells 349 

Slide   Rules    363.   444 

Slide   Rules,    Richmond's 363 

Slide  Scale  for  Milk 363 

Slide  Trays   350 

Slide   Wire  Bridge 403 

Sliding    Resistances    224,  225 

Sling   Hygrometers    317 

Sling  Psychrometers 317 

Smith  Ductility  Machines 21 

Smith    Fermentation    Tubes..    234 
Smith    and    Hale    lonization 

Cell    399 

Smith's    Platinum    Crucible..    409 

Smoking   Pipes    404 

Snap  Switches   229 

Snips   440 

Soap,  Green   Oil 444 


Soap,   Palm   Oil 354 

Sockets    for    Electrical    Con- 
nections        228 

Sodium  Monochromatic  Burn- 
er        366 

Sodium  Spoons 462 

Soil  Acidity  Tester,  Truog.  .  .    456 

Soil    Analysis    Apparatus 

236,  237,  247,  249.  445-460 

Soil  Analysis  Flasks. 247,  249,  449 

Soil  Analysis  Sieves 441 

Soil  Augers    452,  463 

Soil    Balances    43,51 

Soil  Borers 462.  453 

Soil  Centrifuges 446.   447 

Soil  Filters 236.  237 

Soil   Flasks   247.  249.   449 

Soil  Grinders  and  Mills. .  .177-181 

Soil  Pans   445 

Soil   Sieves    440-442 

Soil  Thermometers 499 

Soil    Tubes    457-459 

Soil  Tube  Auger 460 

Soil  Tube  Brushes. .  .109,  453.  469 

Soil  Tube  Hoist 454 

Soil  Tube  Rack 460 

Solder     460 

Soldering  Coppers   46C 

Soldering  Irons   460 

Soldering   Iron   Heaters 118 

Soldering   Outfits    460 

Soldering  Paste    460 

Solidimeter    315 

Solution  Heaters,   Electric... 

306.   307 

Solution  Scales 42,  43,  51.  54 

Sommer's      Hydrometers      for 

Asphalt    23 

Soundness  Test  Apparatus  for 

Cement    133 

Soxhlet  Condenser   165 

Soxhlet    Extraction     Appara- 
tus      231.   232 

Soxhlet    Extraction    Tubes...   231 

Soxhlet  Flasks    231,  247 

Spark    Coils    208 

Spark    Metal    Renewal 288 

Spatulas,  All  Kinds.. 255,  410.   461 

Spatulas,  1'latinum 410 

Spatulas,   Steel    255.   461 

Specie  Jars   328 

Species  Covers,  Botanical....      96 
Specific      Gravity      Apparatus 

for  Cement    133 

Specific      Gravity      Apparatus 

for   Gas,   Chancel's 281 

Specific     Gravity     Apparatus, 

Jackson's   133 

Specific  Gravity  Balances.... 

46,   51,   52 

Specific      Gravity      Balances, 

Jolly  Spring   62 

Specific  Gravity  Balance,  Tor- 
sion          46 

Specific        Gravity        Balance, 

Westphal     51 

Specific  Gravity  Bottles 

24,   104,   105 

Specific  Gravity  Bottles,  Bar- 

rett-Hubbard     24.   104 

Specific  Gravity  Hydrometers 

311-313.   315 

Specific  Gravity  Pan.  A.S.T.M.     25 

Specific    Gravity    Tubes 

104,  105,  133.  459 

Specific    Heat    Apparatus    for 

Soils    456 

Specific   Resistance   Table 628 

Specimen    Bottles    103-105 

Specimen    Forceps    256 

Specimen  Jars...  104,  105,  327,  328 

Specimen  Mills   179 

Specimen   Mounts,   Riker 461 

Specimen  Tubes   103.  487 

Specimen  Vials 99,  100.  103 

Spectrum   Burner    366 

Spectrum  Charts   145 

Spectrum   Lamp    366 

Speed  Counters.. 135,  138,  141.  462 
Speed    Indicators    for    Centri- 
fuges    135,   138,   141 

Speed  Reducing  Gear  for  Mo- 
tors       216 

Spence's       Lactometer       (Hy- 
drometer)         313 

Spencer  Immersion  Flask.  .  .  .    475 

Spencer   Lamps    345-347 

Spencer   Microscopes    339-342 

Spencer   Pipettes    404.   475 

Spencer    Ribbon    Carrier 353 


Page 
Spencer  Rotary  Microtomes. . 

362,   353 

Sperm    Candles    292 

Spherical  Condenser    165 

Sphygmomanometer,    Roger's.     87 

Spinthariscope    426 

Spiral  Anodes    410 

Spiral   Condensers    165 

Spirit  Hydrometers    312 

Spirit    Lamps    120,   121 

Spirit   Levels    61,   333,   334 

Splints    462 

Sponges    410.46:: 

Sponge,  Platinum    410 

Spoons,   All   Kinds...  184,  410.  462 

Spoons    for   Blowpiping. 184 

Spoons,   Combustion    184.  410 

Spoons,  Deflagration 184,   410 

Spoons,   Platinum    410 

Spoons,   Sodium    462 

Spreading   Boards,    Insect....    326 
Sprengel's      Specific      Gravity 

Bottle    105 

Springs,    Watch    512 

Spring    Back    for    Microtome 

Knives    355 

Spring  Balances 52,   53 

Spring    Board    Compactor....    448 

Spring  Clamps   » 146.   147 

Spring  Clips   152 

Spring  Divider 200 

Spring   Gages    272.   273 

Sprouting  Apparatus,  Schoen- 

jahn's    300 

Sprouting  Cup   300 

Sprouting  Media 302 

Sputum   Bottles    141 

Sputum   Dish    463 

Sputum    Shaker    439 

Sputum   Tray    463 

Sputum  Tubes  for  Centrifuge   134 

Squares    203.   463 

Squibb's  Automatic  Burette..    112 
Squibb's  Separatory  Funnel..    259 

Squibb's  Ureometer    509 

Squibb's   Urinometers    510 

Stages,      Warm,      for     Micro- 
scopes       350 

Stage   Cable    Wire 522 

Stage   Micrometers    347 

Staining    Apparatus,    Electric  464 

Staining   Dishes    188 

Staining  Jars   328 

Staining  Racks    350 

Staining   Tray    188 

Stalls,   Finger    243 

Stamps,  Steel   186 

Stands,  Wood,  for  Test  Tubes 

480.  481 

Standard   Balls    for   Hardness 

Testers     304 

Standard    Bars    for    Hardness 

Tester   304 

Standard  Calorimeter,  Parr...   126 

Standard  Candles   292 

Standard  Cells   70 

Standard    Cell,    Weston 70 

Standard  Clamps    150 

Standard      Color     Tubes      for 

Kuttner  Calorimeter  ....85.   157 
Standard  Fermentation  Tubes  235 

Standard  Hygrometer 316 

Standard  Incandescent  Lamps   331 
Standard     Milk     and     Cream 

Test  Bottles    358 

Standard      Paper      Thickness 

Gage    392 

Standard     Photometric     Can- 
dles        292 

Standard  Pressure   Gage 273 

Standard   Resistances    223 

Standard     Sand     for     Cement 

Testing    132 

Standard  Sieves    441.  442 

Standard  Vacuum  Gage 273 

Standardized   Burettes    112 

Standard!  zed    Cylindrical 

Graduates    183 

Standardized  Thermometers. . 

491-495.   499 

Standard!  zed    Volumetric 

Flasks     250 

Standard!  zed    Volumetric 

Pipettes    406 

Star      Support      for      Bunsen 

Burner    123 

Steam    Funnels    258 

Steam  Heated  Stills 197,   198 

Steam  Heated  Water  Baths.  . 

513.   614 


CENTBAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


549 


Page 

Steam  Jet  Filter  Pump 243 

Steam      Pressure      Sterilizers 

(Autoclaves)     26-29 

Steam  Pumps    243 

Steam   Stills    197.  198 

Steam   Sterilizers.   Arnold....   469 

Steam    Water    Baths 514 

Steaming    Apparatus   for    Ce- 
ment        133 

Steel  Analysis  Apparatus 

153.  154.   159.  160-163 

Steel      Balls      for      Hardness 

Tester   304 

Steel      Bars      for      Hardness 

Tester   304 

Steel   Clamps    149 

Steel  Crucible  Tongs. 255,   602.   503 

Steel   Dies    186 

Steel    Dishes    433.   434 

Steel  Dissecting  Needles 190 

Steel  Figures   186 

Steel  Forceps 256 

Steel   Letters    186 

Steel  Measures    125.  272-274 

Steel   Mortars    177.  366 

Steel  Needles  for  Dissecting.    190 

Steel   Pyrometer   Tubes 421 

Steel   Rod,   All   Kinds 526 

Steel  Spatulas 255.   461 

Steel   Stamps    186 

Steel   Tape   Measures 486.  487 

Stt-t-1  Test  Tube  Support 481 

Steel   Tubing.   Flexible 431 

Steel  Wheel  Glass  Cutters... 

295.  296 

Steel  Wire 522 

Stencils     463 

Slender  Dishes   188 

Step-Up   Transformers    227 

Sterilizers.    All   Kinds 465-469 

Sterilizers,  Arnold,  Steam....   469 
Sterilizers,  DeKhotinsky  Elec- 
tric        466 

Sterilizers,  Hot  Air 466-468 

Sterilizers,  Steam    469 

Sterilizers,      Steam      Pressure 

Autoclaves     26-29 

Sterilizer    for    Syringes,    Dis- 
secting  Instruments,   etc...    469 

Sterilizer  Attachment 469 

Sterilizer   Bottles    455 

Sterilizer  Boxes  for  Pipettes  406 
Stevenson  and  Schaub  Mulch 

Cylinder    450 

St.-u-   Pans    329 

Stewart  Counting  Apparatus.  168 
Strwart  Cover  Glass  Forceps  256 

Stk-ks,  Charcoal 93,   144 

Sticks,  Meter  and   Yard 435 

Still.  Brown  Oil 378 

Still.  Mercury,  Hulett 199 

Stills,   Tar   Testing 20,   21 

Stills,  Water 195-198 

Still.  Wine   199 

Still    Heads    199.200 

Stillson's   Pipe    Wrench 523 

Stirrers,    Glass    296.   470 

Stirring   Apparatus    

229,  470,  517.  518 

Stirring  Rods  of  Glass... 296.  470 

Stirring   Rods,   Nafls' 357.  363 

Stocks,    Screw    Die 436.  437 

Stoddard's   Clamp   Holder 148 

Stoddard's  Funnel  Supports..    479 

Stokes  Stills   198 

Stones.  Oil 373 

Stone  Jars   329 

Stone's  Tension  Clamp 152 

Stoneware  Gas  Generator....    287 

Stoneware  Jars   329 

Stoneware    Mortars    367 

Stoneware  Pitchers    9 

Stoneware  Water  Bottle 329 

Stop-Cocks,  All  Kinds.282.  470-472 
Stop-Cocks  for  Gas  Bag.. 282,  471 

Stop-Cock   Grease    472 

Stoppers,   Cork    166.   167 

Stoppers,  Rubber  ...103,  301.  429 
Stoppers,  Rubber  for  Serum 

and  Vaccine   Bottles 103 

Stop-Rite  Time  Switches. 443.  502 

Stop-Watches    473.   474 

Storage  Batteries    70-73 

Storage  Batteries.  Edison....  73 
Storage  Battery  Chargers. 71.  313 
Storage  Battery  Hydrometers  71 

Storage   Battery   Jars 70-72 

Storage  Battery  Testers. .  .71,  313 

Storage  Tank   329 

Stoves,  Alcohol 120.  121 


Page 

Stoves,    Electric    306.   308-310 

Stoves,   Electric  Heating,   for 

Incubators    322 

Stoves,  Gas 116-118.  310 

Stoves,  Gasoline 121.   122 

Stoves,    Kerosene    122 

Stoves,    Liquid    Fuel 120-122 

Straight  Edge    474 

Straus  Lactic  Acid  Funnel...  -5.' 
Straus  Separatory  Funnel...  259 

Streak  Plate    16.  94 

Stretcher  for  Rubber  Tubing.    431 

Strip,  Brass   524 

Strops,   Microtome   Knife 355 

Student  Microtome  .  — 351 

Students'   Mineral   Collection.    365 

Suberite   Mats    168 

Suberite   Kings    168 

Sub-Q    Safety    Syringes 485 

Substage   Condenser,  Abbe...    343 

Sucrose   Pipettes    405.  475 

Suction  Filters 242.  243 

Suction  Pumps 

89-92,  242,  243,  414-416 

Sugar  Analysis  Apparatus... 

62,  179.  181.  188,  409.  475 

Sugar  Analysis  Dishes,  Fused 

Silica    188 

Sugar  Analysis   Funnel 257 

Sugar       Analysis       Platinum 

Dishes     409 

Sugar  Beet  Press 414 

Sugar   Beet   Shredding   Mill..    181 

Sugar   Cane   Mills 179.   181 

Sugar  Capsules   188 

Sugar   Dishes,   Fused   Silica..    188 

Sugar    Dishes,    Platinum 409 

Sugar   Dish   for    Weighing...      62 

Sugar  Flasks   250 

Sugar  Hydrometers 315 

Sugar  Pipettes   404.  476 

Sugar  Presses 181.  414 

Sugar   Thermometer    496 

Sugar  Tube,   Hortvet's 476 

Sugar  Weights   57 

Sulphonation   Test   Funnel...   259 

Sulphur   Apparatus    

126,  171,  249,  302,  475.  476 

Sulphur  and  Ammonia  Deter- 
mination Apparatus  for  Gas 

Analysis    11,281,282 

Sulphur    Bulb    Tubes 476 

Sulphur  Crucible   171 

Sulphur  Determination  Appa- 
ratus.126,  171,  249.  302,  475,  476 

Sulphur  Dioxide  Gas 275 

Sulphur  Flasks   249 

Sulphur  in  Grain  Apparatus. . 

249,   302.   476 

Sulphur  in  Oil  Apparatus...  476 
Sulphur  Photometer.  Parr...  126 

Sulphur   Rack    476 

Sulphur  Turbidimeters  ..126.  507 
Sulphurated  Hydrogen  Gas 

Generators    287 

Sulphuric  Acid   Drying  Tube, 

Vanier    161.  204 

Sulphurous  Acid  Condensers.   165 

Sulphurous   Acid   Gas 275 

Sunshine   Recorder    476 

Supply  Tank  for  Soils 460 

Supports,   All   Kinds 

61,   62,  123,  154,   159. 

168,    185,    229,    233-235,    343, 
397,    398,    406,    458.    477-481.    506 

Supports,  Adjustable 477-480 

Support,   Beehive    506 

Supports,  Burette 478 

Supports,   Burner    123 

Support  for  Capillarity  Tubes  458 
Supports  for  Carbon  Tubes.  .  159 
Supports  for  Condensers. 477.  478 
Supports  for  Conductivity 

Cells   397.   398 

Supports   for  Desiccators 185 

Supports,    Electrolytic    229 

Supports     for     Fermentation 

Tubes 235 

Support  for  Flasks 168 

Supports  for  Funnels.  ..  .478.  479 
Supports,  Glass,  for  Balance 

Leveling  Screws   61 

Support  with  Heaters  for  Ex- 
traction Apparatus   ....233,  234 
Supports  for  Microscopes....    343 
Supports  for  Nessler  Tubes..    154 

Supports  for  Pipettes 406 

Supports   with    Rings 477 

Supports  for  Test  Tubes. 480.  481 
Support  for  Weighing  Bottles  62 


Page 

Support  Levels 833.  334 

Support  Rings 428 

Support   Tables    123,   479,  480 

Surface   Tension   Apparatus..  401 

Surveying  Compasses  . . .  .164.  482 
Surveying  Instruments   ...482-484 

Surveyors'  Arrows   484 

Suspensions    for    Galvanome- 
ters      207 

Suspension    Ribbon    for    Gal- 
vanometers      207 

Swedish   Safety   Matches 335 

Swift  B  Drug  Mill 180 

Swimming   Cups    484 

Switch.   Time    " 502 

Switches  for  Electrical  Work 

228.  229 

Switchboard    for   Motor   Gen- 
erator      218 

Switchboards   for  Pyrometers  420 
Switchboard     Ammeters     and 

Voltmeters 210.  212 

Swivel  Clamps 151 

Swivel  Clamp  Holders 148 

Sy's  Extraction  Apparatus... 

231.   247.  370 

Sy's   Extraction    Flask 247 

Sy's   Fumeless   Digestion   Ap- 
paratus      370 

Syracuse   Water   Glasses 512 

Syringes,  All  Kinds 

71.    313.    484-486 

Syringes,    Battery    71.  313 

Syringes,    Hypodermic    ...484-486 

Syringe  Needles   485.  486 

Syrup  Hydrometer 315 

Syrup  Tube 475 


T-Clamps    151 

T-Squares    203 

T-Tubes    506 

Table   for   Animal   Operations     13 

Table  for  Embedding 354 

Table,  Feet  per  Ib.  of  Wire..  527 
Table  of  International  Atomic 

Weights   144 

Table  of  Magnifications 348 

Table  of  Mendelejeffs  Period- 
ic  System   of   the   Elements  144 

Table    for    Microtome 353 

Tables  for  Oil,  Tycos 378 

Table    for    Parafflne    Embed- 
ding        354 

Table.  Resistance  of  Metal...    528 

Table,   Turn    350 

Table,    Warming    350.  351 

Table,   Weight  of  Rods 528 

Table,  Weight  of  Sheet  Metal  528 

Table,   Wire  Gage 627 

Table  Clamp 151 

Table  Microtomes 351 

Table    Supports    479.  480 

Tablets,     Alkaline,     Farring- 

ton's   357 

Tablets,  Corrosive  Sublimate.    363 

Tachometer    486 

Tacks,  Thumb    501 

Tagliabue's      Melting      Point 

Tester   377 

Tagliabue's   Oil    Freezer 377 

Tallquist  Haemogloblnometer  85 
Tallquist  Haemoglobin  Scale  86 

Tally,  Hand  Counter 168 

Tank  for  Air 414 

Tank,  Evaporation 449 

Tanks   for  Gases 274 

Tank,  Supply,   for  Soils 460 

Tanks   for  Water 329,  449.   456 

Tank  Outfit  for  Gasoline 122 

Tannin  Dish,  Silica 188 

Taps,  Screw   438 

Tap  Drill  Scale 435 

Tap  Sets,  and  Screw  Dies.  .  . .    437 

Tap    Wrenches,    Screw 438 

Tape,  Adhesive.   Botanical. 95.   486 

Tape,  Insulating   229 

Tapes,    Measuring    ..484,   486,  487 

Tapes,   Surveyors'   Chain 484 

Tape  Measures   486,  487 

Tapers,    Wax    521 

Tapered  Connectors  for  John- 
son's   Tubes    163 

Tar  Determination  Apparatus 

for  Gas    285 

Tar    Flasks,    Lunge 247 

Tauber's  Drying  Apparatus..  204 
Teas  Extraction  Apparatus..  232 
Teclu  Burner  118 


550 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  TJ.  S.  A. 


Page 

Telescope  Clamp 151 

Temper  Drawing  Oven,   Elec- 
tric       390 

Temperature   Bulb    for   Folin 

Apparatus    508 

Temperature   Indicators    (Py- 
rometers)     417-423 

Temperature   Recorders    419 

Tenaculums     193 

Tension  Apparatus,  Surface..    401 

Tension  Clamp 152 

Tenth  Megohm  Boxes 222 

Terrapin   Separator    259 

Test  Bottles,  Milk  and  Cream 

357.   358 

Test   Bottle   Brushes 109 

Test  Bottle  Rack 362 

Test  Bottle  Tester,   Nafls.363.   364 

Test  Clips    76 

Test  Glasses   487 

Test  Meters  for  Gases 

284,   285,   289 

Test  Paper 390,  391 

Test  Solutions    508 

Test  Tubes,   All   Kinds 

364,   487,   488 

Test  Tubes,   Butter   Pat  Oil .  . 

364,   488 

Test        Tubes,        Transparent 

Quartz     488 

Test  Tube  Baskets 480.   481 

Test   Tube   Brushes 110 

Test  Tube  Caps,  Rubber 428 

Test  Tube  Clamps 146.   147 

Test  Tube  Cleaners 110 

Test  Tube  Filling  Attachment  488 
Test  Tube  Racks. 480,  481.  517.  519 

Test  Tube  Rubber  Caps 428 

Test  Tube  Stands.480,  481,  517,  619 

Test   Tube   Sterilizer 469 

Test  Tube  Supports 

I..  .480,   481,    517,    519 

Tester,  Air,  Wolpert 10 

Testers,  Cement 131,   133 

Testers,   Cloth  and   Paper 489 

Testers,  Fire  and  Flash  Point 

22,   375,   376 

Tester,   Glue,   Scott's 298 

Testers,   Grain    300 

Testers,  Hardness 303-306 

Testers,  Linen    334 

Testers,  Oil   373-380 

Tester  for  Paper,  Mullen's...    391 

Testers,    Rubber    489 

Testers   for  Test  Bottles.   Na- 
ns'     363,   364 

Tester  for  Yarn 489 

Testing  Apparatus  for  Blood82-87 
Testing     Apparatus     for    Ce- 
ment    131-133,   135 

Testing  Apparatus,  Electrical 

205-229 

Testing  Apparatus  for  Glue..  298 
Testing  Apparatus  for  Grain 

299-302 

Testing  Apparatus   for  Hard- 
ness     303-305 

Testing  Apparatus  for  Milk.  . 

• 356-364 

Testing  Apparatus  for  Oil. 373-380 
Testing  Apparatus  for  Paper, 

Yarns,  Rubber,  Cloth,  etc..    489 
Testing  Machines  for  Cement 

131.   133 

Testing  Machines  for  Oil.  373-380 
Testing  Machines  for  Rubber  489 

Testing   Sieves 302.    440-442 

Thelco  Low   Temperature   In- 
cubators     325 

Thermit    490 

Thermo-Couples     for     Brown 

Pyrometers     420 

Thermo-Electrlc   Pyrometers. 

417-423 

Thermographs    498.   499 

Thermometers,  All   Kinds.... 

18,   20. 

126,    127.    255.    302.    364,    490-499 

Thermometers.    Alarm    493 

Thermometers.    Armored    ....    492 
Thermometers.    Asphalt  Test- 
ing     18.    20,    492 

Thermometer.  Bake  Oven.  2",5.  493 
Thermometers,  Beckmann  .  .  .  493 
Thermometers,  Calorimeter.. 

126.    127,   494 

Thermometers     for     Creosote 

Oil     18,    20.    492 

Thermometers  for  Cryoscopes  493 
Thermometers,  Dairy  364 


Page 
Thermometer,  Dough  Testing 

255.   494 

Thermometers,  Gas  Calorime- 
ter     126,   127,   494 

Thermometer  for  Incubators.    495 
Thermometers,  Low  Tempera- 
ture      491 

Thermometers,  Maximum  and 

Minimum    495,  497 

Thermometers     for     Moisture 

Testers    302    492 

Thermometer,    Pasteurizing..    364 
Thermometer  for  Pitch  Test- 
ing    18.   20,  492 

Thermometers,    Precision.  .491-495 
Thermometers,  Recording  . . 

_„ 498.   499 

Thermometers,   Soil    499 

Thermometer,    Titre   Test....    492 
Thermometers  for  Viscosime- 

_  ters    380.   497 

Thermometer   Charts    ....498    499 

Thermometer  Clamp   148 

Thermometer   Plummets    ....      51 
Thermometer      Reading      De- 
vices     126.  284,   500 

Thermometer  Tubes   492,   493 

Thermometer  Tubing    297 

Thermo-Regulators     500.  601 

Thermo-Regulator,  Ostwald   .    501 

Thermos  Bottles 510 

Thermostat   Baths    401-403 

Thermostats     (Incubators)  . . . 

318-320,   323-325 

Thermostats    for    Low    Tem- 
peratures  401-403,  516,  618 

Thermostats     (Thermo-Regu- 
lators     500.   501 

Thickness    Gages    for    Paper 

Testing    391,   392 

Thieves  for  Oil 379 

Thief  Glasses  379 

Thiele's  Melting  Point  Tube..   336 
Thimbles,  Extraction   ....232.   233 

Thimbles,    Filter    232,   233 

Thistle   Tubes    259 

Thoma   Haemacytometer    ....      84 

Thoma  Mixing  Pipettes 85 

Thorp  Gage   286 

Thread,   All   Kinds 601 

Thread  Counters 334 

Three-Scale   Thermometer    ...  499 

Thumb  Tacks   501 

Thurston's    Oil    Testing    Ma- 
chine     377 

Thwing   Total    Radiation   Py- 
rometers     422,   423 

Tiles     for     Combustion     Fur- 
naces      262 

Tilter,   Carboy    129 

Time  Clocks   152 

Time  Glasses    434 

Time  Marker,   Electric 501 

Time    Regulator    294 

Time  Switches,  Stop-Rite.443.   502 

Timer,   Interval    152 

Tin   Boxes    20.   108 

Tin   Caps    357 

Tin  Foil   Dishes 187 

Tin  Frame  Sieves 442 

Tin  Measures   336 

Tin    Pipe    526 

Tin   Plate   Scoop 436 

Tin    Sheet    526 

Tin  Tubing   526 

Tincture    Bottles    97,   98 

Tincture  Presses   414 

Tinned    Iron   Test   Tube   Sup- 
ports      481 

Tinned  Iron  Wire  Gauze 523 

Tinners'  Shears   440 

Tinsel  Wire   523 

Tint  Photometer    165 

Tintometer,   Hess-Ives    155 

Tips    for    Blowpipes 93.   408 

Tips  for  Burettes 113 

Tips,   Rubber    429 

Tirrlll  Burner 118 

Tissue,   Rubber    429 

Titre    Test   Thermometer 492 

Titre  Tubes 488 

T.   K.   Dropping   Bottles 99 

Toluol  Regulators.  Ostwald..    601 
Tongs,  All  Kinds. 255,  411,  502,  503 

Tongs,   Cupel    503 

Tongs,  Crucible 255,   602,   503 

Tongs,  Cylinder   255,   503 

Tongs,  Gas 411 

Tongs.    Scorifler    503 

Tool  Cabinets   503.   504 


- 

Tool  Holders   503.   504 

Tool   Sets    503.   504 

Tool    Steel   Mortars 366 

Tops   for   Burners,    Gauze....    123 

Tops  for  Burners,   Wing 123 

Torches,    Gasoline    121 

Torches,  Laboratory 121 

Torsion   Balances 41-46 

Torsion    Balances    for   Cream 

Test 41 

Torsion        Balance,        Specific 

Gravity    4$ 

Total  Carbon  Apparatus 126 

Towelling,    Crash    504 

Towers,  Calcium  Chloride 124 

Tracing   Cloth    152 

Trains,    Combustion    160.   161 

Tralle   Hydrometers    312 

Transfer   Pipettes    405.   406 

Transference  Tubes,  Wash- 
burn 403 

Transformers     for     Charging 

Storage   Batteries    217.  218 

Transformers,  Electric. .  .226.  227 
Transparent  Adhesive  Tape.. 

95.   48C 

Transparent  Quartz  Appara- 
tus   78, 

162,    163,    173,    187,    249,    428.    488 
Transparent    Quartz    Beakers     78 
Transparent  Quartz  Combus- 
tion Boats   249 

Transparent  Quartz  Combus- 
tion Tubes 163 

Transparent  Quartz  Crucibles  173 
Transparent  Quartz  Dishes..  187 
Transparent  Quartz  Flasks..  249 
Transparent  Quartz  Retorts.  428 
Transparent  Quartz  Test 

Tubes    488 

Transplanting  Trowel 506 

Traveling  Outfits  (Milk  Test- 
ers)   360.  361 

Tray,  Cupel 182 

Trays,   Filtering    237 

Trays,  Germinating   299,   300 

Trays,  Micro  Slide 360 

Trays,  Mineralogical  Speci- 
men    365 

Trays,    Photo    504 

Trays,  Sampling   432 

Trays,  Soil   457 

Trays,  Staining   188 

Triangles,  All  Kinds 

185,  203,  504.  505 

Triangles,  Drawing 203 

Triangles,   Glass    185 

Triangles,    Platinum    411 

Triangles,   Silica    505 

Triangle  Holder    505 

Triangle   Support    185 

Triangular   Desiccator    185 

Triangular  Files   235 

Triangular  Scale 203 

Trip  Scales   54 

Triple  Aplanatic  Magnifiers.  .  335 
Triple  Wall  Incubators.  .  .318,  323 

Tripods 505 

Tripod  for  Bunsen  Burner...    123 

Tripod  for  Desiccators 186 

Tripod  Magnifier   336 

Troughs,   Pneumatic    506 

Trowels,    All    Kinds 133,   506 

Trowels  for  Cement  Testing.    133 

Troy   Weights    69 

Trunnion,    Acid   Bottle 356 

Truog  Soil  Acidity  Tester.  . .  .    456 

Try  Squares    463 

Tube  Gages    272,   273 

Tubes,    All    Kinds 506.   607 

Tubes,   Absorption    8,   9, 

124,    145,    160,    161,    371,    413.    414 
Tubes.  Air  Thermometer  ....      10 

Tubes,  Alundum    261 

Tubes,  Ammonia   Test 11.   153 

Tubes,  Arsenic 17 

Tubes,   Barometer    65,  297 

Tubes  for  Blowpiping 94 

Tubes,  Board  of  Health 

141,   487.   488 

Tubes,  Boiling  Point,  for 
Molecular  Weight  Determi- 
nation Apparatus  401.  402 

Tubes,  B.  S.  for  Oil 140.   374 

Tubes,  Bulb  Connecting  for 
Marshall's  Urea  in  Blood 

Apparatus    '87 

Tubes,   Butter   Fat  Oil 364 

Tubes,   Calcium  Chloride 124 

Tubes,  Capillary   297 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  8.  A. 


551 


Page 

Tubes,    Capillary    Electrome- 
ter     398.   399 

Tubes,  Capillarity    457.  458 

Tubes,   Carbon    Filter 257 

Tubes,    Carius    Bomb 297 

Tubes,  Casein 138.   141.  358 

Tubes,  Centrifuge 

134,   135,   138,   140,   141 

Tubes,  Chloride  of  Calcium..   124 

Tube,   Chlorine    145 

Tube.  Chlorine  Absorption...    145 

Tubes.   Color    153.   154 

Tubes,  Combustion    163.   297 

Tubes.   Combustion.   Platinum  '408 

Tubes,  Comparison 153 

Tubes,   Condenser    165 

Tubes,  Connecting,   for  Gas..    506 
Tubes.    Connecting,    for   Mar- 
shall's Urea  in  Blood  Appa- 
ratus          87 

Tubes,   Cream    364.  488 

Tubes,  Culture    ..487.  488 

Tube,    Dissolving    195 

Tubes;   Distilling    199.  200 

Tubes,    Drying    124.  204 

Tubes,    Eggertz    153 

Tubes.    Extraction    230-233 

Tubes,  Fat  Extraction.  Roeh- 

rig    233 

Tubes,   Fermentation    ....234,  235 

Tubes.   Filter    257 

Tubes,     Folin    for    Marshall's 

Urea  In  Blood  Apparatus.  .      87 
Tubes,  Fractionating^.  ..  .199,  200 

Tube.   Freas  Dissolving 195 

Tubes,   Freezing,   for  Molecu- 
lar   Weight    Determination 

Apparatus    400 

Tubes,    Funnel    257.  259 

Tubes,  Gas  Collecting    286 

Tube,   Gas   Filter 287 

Tubes.   Glass,    Annealed    Ends 

296.  297 

Tubes,  Glass,  for  Blowpiping  94 
Tubes.  Goetz  Phosphorus.  135,  141 

Tubes,   Gooch    Filter 257 

Tubes  for  Haematokrlt 134 

Tubes.  Hard  Glass 94,  427.  488 

Tube,  Hortvet's 476 

Tubes,    Ignition    427,   488 

Tubes.   Liebig   Drying 204 

Tubes    for    Mailing 254.   335 

Tubes,   Manometer    273 

Tubes.     Marchand's     Calcium 

Chloride   124 

Tubes,  Melting  Point,  Thiele's   336 

Tubes,   Migration    399 

Tubes,  Milk  for  Centrifuge... 

135.   138.   141 

Tubes.  Nessler   153 

Tubes.    Oil    140.   374 

Tube.    Ozone.    Siemen's 390 

Tubes.      Palladium      for     Gas 

Analysis 290 

Tubes,       Pelligot's       Calcium 

Chloride   124 

Tubes,  Percentage,  for  Haem- 

atokrit    134 

Tubes.  Percolation  of  Air....  459 
Tubes,  Phosphorus.  Blair's..  427 

Tube,  Platinum   408 

Tubes.  Porcelain    163 

Tubes.    Pyrometer    420.   421 

Tubes,   Quartz    163 

Tubes.    Reduction    427 

Tubes,    Roehrig    Extraction..   233 

Tubes.    Safety    259 

Tubes,  Sample 103.   105.  286 

Tubes.        Schwartz        Calcium 

Chloride   124 

Tubes,  Sealing 297 

Tubes.    Sediment    for    Centri- 
fuges  134.   135,   140.   141.   374 

Tubes.   Silica    17.   163 

Tubes.  Siphon,  for  Extraction 

Work    230-232 

Tubes,   Soil    457-459 

Tubes.  Soxhlet    231 

Tubes,  Specific  Gravity .  .104.  105 
Tubes.  Specimen.  103,  105.  487.  488 
Tubes,  Sputum  for  Centrifuge  134 

Tubes,   Sugar    475 

Tubes,   Sulphur    476 

Tubes,   Syrup    475 

Tubes.  T   506 

Tubes,   Test    487.   488 

Tubes,   Thermometer    ....492.   493 

Tubes,  Thistle    259 

Tubes,    Transference,    Wash- 
burn    403 


Page 

Tubes,    U    124.  506 

Tubes,  Urine    134,  135 

Tubes,  Vaccine 138.  141 

Tubes.  Vacuum    BIO 

Tubes,  Viscosity    403 

Tube,  Volume  Weight   459 

Tubes,   Water   Analysis 

153,  164.  620 

Tubes.  Water  Holding  Capac- 
ity       459 

Tubes,  Weighing 106.  107 

Tubes.   Y    506 

Tube    Balance,    Centrifuge...    14! 

Tube  Brushes    108-110.   459 

Tube   Brush   for   Burettes....   108 
Tube   Brushes    (Test   Tube) . .    109 

Tube   Clamps    146-148 

Tube   Furnace.    Carius 2 

Tube  Furnace,  DeKhotinsky..    2 

Tube  Furnace.  Hoskins 260 

Tube  Furnaces.  Multiple  Unit  2«1 

Tube   Gages    125.   272.   273 

Tube  Support  Stands 

154,  159.  480.  481,  517,  519 

Tuberculin    Syringes,    Luer.. 

484.   486 

Tubing,  Barometer   65.  297 

Tubing.   Brass',   for  Burner...    117 

Tubing.  Burner 117.  430,  431 

Tubing.  Combustion    163.  297 

Tubing.   Fiber    526 

Tubing.   Flexible  Metallic.117.  431 

Tubing,  Glass    296.  2! 

Tubing,   Lead    626 

Tubing.    Metallic.    All   Kinds. 

.........  . 524-52 

Tubing.   Rubber    430.  431 

Tubing,  Silica   163.  443 

Tubing.   Thermometer    2 

Tubing.   Transparent   Quartz.    163 

Tubing  Connections 506 

Tubing  Gages    272.  2 

Tubing  Gage.  Micrometer   . . .    126 

Tubing   Stretcher    431 

Tuerk  Counting  Chamber.... 

Tumblers.    Glass 329.    458.    S07 

Tungar    Rectifiers     2 

Turmeric  Paner    S 

Tungsten    Filament   I>amps.  ..   3: 

Turbidimeters 1R9.  507 

Turbidimetpr.  Sulphur   ...12fi.   507 

Turbidity   Scale    169.   507 

Turbine.  High  Speed 470 

Tiirk    Haemacvtometer    84 

Turkev  Red   Cloth.... 1 

Turned  Wood  Boxes 1 

Turn-Table    350 

Tutweiler       Modification       of 

Hemnel  Gas  Burette    ? 

Twaddle  Hydrometers    S 

Tweezers    -• ,  -    256 

Twine 17.   165.  507 

Twist   Drills    204 

Twisted  F1<»T  Co'd 165 

Two-Wav   Stop-Cocks    ...471.   472 
Tycos   OH   Tables 378 


I'    Tubes    124.   R06 

T-bhelnhde   Viscosimeter    379 

T'.   G.   T.   Gas   Apparatus 2 

U.  G.  I.  Gas  Ptoette 294 

T*.  G.  I.  Heat  Value  Computer  2R4 
Ukena's   Color  Comparator.  ..  1 

Umpire  Ore  Samplers 433 

Underwriters'        laboratories 

Extraction  Apparatus 232 

U.   S.   Bureau   of  Mines   Flash 

Point  Testers   376 

U.    S.    Bureau    of    Mines    Gas 

Analvsls    Apparatus    ...276.   277 
tT.    S.    Bureau    of    Mines    Gas 

Collecting  Tubes 286 

V.  .S.   Bureau   of  Mines  Gaso- 
line Distillation   Apparatus.   374 
T"      S.     Bureau    of    Mines    Oil 

Testers     374.   376 

V.   S.  Customs  House   Alcohol 

Hvdrometer    312 

P.   P.  Department  of  Agricul- 
ture Hvdrometers    313 

U.  S.  Geological  Survey  Colo- 
rimeter     159 

U.   S-   Geogolical   Survey  Tur- 

btdiTtieter    159.   507 

t"   S.  P.  Green  Oil  Soap 444 

t".  S.   Signal   Service  Barome- 
ter          64 

U.  S.   Steel  Gas  Apparatus...    280 


Page 
Universal  Clamps  and  Clamp 

Holders   148 

Jnlversal   Compound   Rotator  2 
Jnlversal   Hose   Connectors..    308 

Universal    Hydrometer     3 

Jniversal    Meteorological   Set  338 

Universal  Motor   214 

Universal   Sampler.   Braun's..    433 
Jnlversal  Shunts  for  Galvan- 
ometer        206 

Universal   Viscosimeter,    Sey- 

bolt 380 

Universal  Wax   521 

Ure    Eudiometers    23<l 

Jrea  Apparatus,  Folln 509 

Urea    Apparatus,    Van    Slyke- 

Cullen   509 

Urea  in  Blood  Apparatus.  Mar- 
shall          87 

Urea,  Nitrogen  and  Ammonia 
in    Urine,    Folin    Apparatus 

for   508.   .109 

Ureometer,  Doremus 509 

Ureometer,  "Squibb's   509 

Uricometer.    Ruhemann    509 

Urinary    Apparatus    

134,    135,   156,  487,   508-510 

Urine  Analysis   Apparatus .  . . 

156,  508-510 

Urine  Centrifuge  Tubes.. 134.  135 
Urine  Glasses  for  Sediment.  .  487 
Urlnometers  510 


Vaccine  Bottles 103 

Vaccine   Bottle   Stoppers 103 

Vaccine  Culture  Baths.  .  .517-519 
Vaccine  Tubes.  Hopkins.  .138.  141 
Vaccine  Tube  Support. . .  .481.  519 

Vacuum   Air  Pumps    

89-92.    242,   243.   414-417.    424 

Vacuum        Blood       Collecting 

Tubes    83.   84 

Vacuum   Desiccators    184 

Vacuum   Distilling  Apparatus  4: 

Vacuum  Drying  Ovens 388 

Vacuum   Flasks.  De-war 6 

Vacuum  Gages 2 

Vacuum   Gage.  McLeod's 273 

Vacuum  Pumps  

89-92.  242.  243.  414-417.  424 

Vacuum  Pumps  and  Blowers. 89-92 
Vacuum  Specific  Gravity  Bot- 
tle         104 

Vacuum  Wax   416 

Valence  Models.   Nead's 366 

Valves  for  Gas  Cylinders. 274.  276 
Vanler  Combined  Potash  Bulb 

and   Drying   Tube 9.   161 

Vanier  Combustion  Train  and 

Accessories   161 

Vanier   Drying   Tubes 161.   204 

Vanier  Sulphuric  Acid  Bulb.. 

161,  204 

Vanier  Zinc  Tube 161.  204 

Van  Slyke  Apparatus  for  COj 

In   Blood   Plasma 83 

Van  Slyke  Apparatus  for  the 
Gasometric      Determination 
of  Aliphatic   Amlno  Groups   372 
Van  Slyke-Cullen  Urea  Appa- 
ratus        509 

Vapor       Density       Apparatus. 

Dumas    510 

Vapor      Density      Apparatus, 

Victor-Meyer    511 

Vapor      Density      Apparatus. 

Welser    511 

Variable    Speed    Motors 

126.   128.   373 

Vapormeter    204 

Varnish    Hydrometers    315 

Varrentrap's  Nitrogen  Bulbs.    371 

Vasculum.  Botanical   95 

Vaughan  Animal  Holder 12 

Ventilation  Tester   10 

Vernier  Calipers 126 

Vessels,    Acid    186 

Veterinary      Clinical       Ther- 
mometer         494 

Vials     99.   103 

Vials.   Homepathlc    99 

Vials,   Screw  Cap 103 

Vlcat's  Indenting  Apparatus.   133 
Victor    Centrifuges    and    Ac- 
cessories     135-138 

Victor-Meyer's  Vapor  Density 

Apparatus   511 

Victor-Meyer's  Water  Bath..  517 
Vinegar  Hydrometers  315 


552 


CENTRAL  SCIENTIFIC  CO.,  CHICAGO,  U.  S.  A. 


Page 

Viscosimeters,  Asphalt   25 

Viscosimeters,  Oil    379.  380 

Viscosity  Flasks,  Saybolt    ...  380 

Viscosity  Pipette,  Drucker...  403 

Viscosity   Pipette,   Ostwald...  403 

Viscosity  Testers    26,   379,  380 

Viscosity  Thermometers.  .380,  497 

Vises   w'ith   Anvil 611 

Vise,  Hand   512 

Vitrified      Clay      Combustion 

Boats    162 

Vitrified      Clay      Combustion 

Tubes    163 

Voge's  Animal  Holder 13 

Volhard's  Nitrogen  Bulbs 371 

Volt  and  Ampere-Meters.  .209-213 

Volt-Ammeters    209-213 

Voltameters    403 

Voltmeters    and    Mllllvoltme- 

ters    209-213 

Volume   of   Loaf  Apparatus.  .  255 

Volume  Weight  Tube 459 

Volumetric   Flasks    249.  250 

Volumetric  Flasks,  Precision.  250 

Volumetric  Pipettes 405,  406 

Volumetric     Pipettes,     Preci- 
sion      406 

Vulcan  Non -Blast  Burners... 
119.  269 

W 

Walker  Induction  Coll 399 

Walker  Specific  Gravity  Bot- 
tles       105 

Wall  Brackets  for  Balances.  .      61 

Wall  Charts   144,  145 

Wall  Type  Pyrometers 

418,   419,    423 

Walter   Dropping   Funnel 259 

Wantage  Rods   380 

Warm  Stages  for  Microscopes  350 

Warming  Tables    350.   351 

Wash  Bottle  Flasks.  105,  106.  244 
Washhurn's  Conductivity  Cells  396 
Washburn's  Iodine  Coulome- 

ter    397 

W  a  s  h  b  u  r  n's    Transference 

Tube   403 

Washer  Cutter    612 

Washing    Bottles    ...105,   106,   294 

Washing  Bottles,  Gas 294 

Washing  Flasks. 105,  106,  244.  294 

Washing  Horn  for  Gold 298 

Washing  Pans    253 

Washington      School      Collec- 
tions        366 

Washita  Oil  Stone 3 

Wassermann   Baths    517-519 

Wassermann     Reaction     Test 

Tubes    488 

Wassermann  Safety  Pipettes.    405 

Wassermann   Supports    

481.   517,   519 

Waste   Can    512 

Waste  Jars    329 

Watches,    Stop-    473,   474 

Watch  Clips   148 

Watch   Glasses    61,   512 

Watch  Glasses,  Counterpoised 

61.   512 

Watch   Glass  Clamps 148,   512 

Watch  Springs 512 

Watchmakers'  Glasses  ...334.  335 
Water  Analysis  Apparatus... 

153.  154,  159,   405.   409,  520 

Water  Analysis  Pipettes 406 

Water       Analysis       Platinum 

Dishes     409 

Water  Analysis  Tubes 

153,   154,   159,   520 

Water  Baths.   All    Kinds.  .513-520 
Water   Baths.    Serological  .517-519 
Water  Baths  for  Vaccine  Cul- 
tures, Wassermann  Test,  etc. 

517-519 

Water   Bath    Thermometers..    497 

Water  Blasts    92 

Water  Bottles 106,   329 

Water  Chambers   for   Radium 

Emanation     424 

Water  Comparison   Cylinders.   153 
Water    Decomposition    Appa- 
ratus     332.   333 


Page 

Water    Examination    Appara- 
tus,   Whipple    620 

Water  Gage    387 

Water  Heaters    307,   308 

Water        Holding        Capacity 

Tubes    459 

Water  Indicator  and  Oil  Sam- 
pler        380 

Water   Indicating   Paper 380 

Water  Jet  Filter  Pump 243 

Water  Level,  Kekule 387 

Water  Level   Regulator 387 

Water   Motors    368 

Water  Motor  Centrifuges. 134.   373 

Water   Ovens    386 

Water  Power  Centrifuges. 134,   373 

Water  Retention  Cup 460 

Water   Sample   Bottles 106 

Water  Sampling  Apparatus.  .    520 

Water  Stills    195-198 

Water    Table    Apparatus    for 

Soils    448 

Water  Tanks    329.   449.   -"5fi 

Water  Tester   520 

Water   Turbidity   Measures.. 

159,   507 

Watt   Meters    211 

Wax,   Bees'    '. 521 

Wax,   Sealing    521 

Wax  for  Stop-Cocks 472 

Wax,   Universal    521 

Wax,   Vacuum    416 

Wax   Bottles    106 

Wax  Melting  Point  Testers.  . 

377.   378 

Wax  Pencils   395 

Wax  Tapers    521 

Wax  Test  Thermometers. 496,   497 
Weather      Bureau      Standard 

Thermometers    499 

Weather  Forecast  Charts....    521 
"Weather    and    Weather    In- 
struments"       521 

Wea.therhead  Crushers 175 

Wedgewood  Mortars   367 

Weighing  Air   Balloons 63 

Weighing   Bottles    106.   107 

Weighing   Bottle   Supports...      62 

Weighing  Burette   112 

Weighing  Capsules  or  Scoops 

61,   62 

Weighing  Dishes 61,   62.   187 

Weighing  Pipettes  107 

Weighing  Scoops 61.   62 

Weighing  Soatulas   461 

Weighing   Tubes    106,   107 

Weighing   Tube   Support 62 

Weights,    Analvtlcal    55-67 

Weights,   Apothecaries'    B9 

Weights,   Assay  Ton 57 

Weights,    Avoirrtunois    RR.   Kfl 

Weights  for  Balances 55-60 

Weights.    Decimal    Pound....      58 

Weights,  Factor    57 

•Weights,  Fractional    56.   58 

Weights,    Prescription    59 

Weights  for  Sugar   Analysis.      67 

Weights.  Trov   59 

Weie-ht   Block    62 

Weierht  Hangers   60 

Weight    of   Rod    Table 628 

Weight  of  Sheet  Metal  Table   528 

Weight    of   Wire    Table 527 

Weiser  Vapor   Density  Appa- 
ratus        611 

Weld  Specific  Gravity  Bottle.    105 

Welsbach  Lamps    117.   291 

Weston     Ammeters,     Voltme- 
ters     210-213 

Weston    Standard   Cell 70 

Westphal       Specific       Gravity 

Balance     61 

Wet   Cup.    Blackfan's 87 

Wet  Pressure  Governors 284 

Wet  Test  Meters 284.  285.  289 

Whatman     Extraction     Thim- 
bles        233 

Whatman    Filter   Paper.  .  .239-241 
Wheat  Dockage  Sieves.  .  .302.  442 

Wheatstone   Bridges    

222.   223,   403.   455 

Wheatstone  Slide  Wire  Bridge   403 

Wheels.  Emery 368.   412 

Whtch-Way   Levels    334 


Page 
Whipple     Ocular     Micrometer 

Disk    520 

Whipple   Water    Examination 

Apparatus    520 

Whipple   Water   Bath 519 

White   Enameled   Palls 390 

White   Rubber   Tubing 430 

Whitney's  Soil  Sampling  Tube    454 
Wicks  for  Alcohol  Lamps.  .  .  .    120 

Wiessnegg   Blast   Lamp 120 

Wiessnegg  Muffle  Furnaces.  .    269 
Wiley  Extraction  Apparatus.    232 

Wiley    Water    Bath 520 

Wiley-Richardson    Extraction 

Apparatus    . . ., 232 

Will    -   Varrentrap      Nitrogen 

Bulbs    371 

Williams  Gas  Analysis  Appa- 
ratus        281 

Window    Thermometers    493 

Wine  Stills    198.  199.  204 

Wine  Tester,   Salleron's 204 

Wing    Dividers    '.    201 

Wing   Top    for   Burners 123 

Winkler   Gas   Burette 282 

Winkler  Gas  Collecting  Tube  286 

Winkler   Gas    Pipette 294 

Winkler  Potash  Bulb 414 

Wire.  All  Kinds... 94,  411.  521-523 

Wire.  Platinum   411 

Wire,  Platinum,  for  Blowplp- 

ing   94 

Wire  Baskets  for  Autoclaves.    481 
Wire  Baskets  for  Test  Tubes  481 

Wire   Clamps    146-148 

Wire  Cutting  Pliers    411.   412 

Wire  Form   Solder 460 

Wire   Gages    274 

Wire  Gage   Tables 527 

Wire  Gauze 623 

Wire    Holders    for    Platinum 

Wire    32B 

Wire  Resistance  Table 527 

Wire  Test  Tube  Supports....    481 

Wire    Triangles    504.   505 

Wire  Weight  Table 527 

Wisconsin     Hydrostatic     Bal- 
ance     47.   357 

Witt  Filter  Plates 238 

Wolffhuegel    Counting    Appa- 
ratus        169 

Wolpert's  Air  Tester 

Wood  Boxes   108 

Wood  Cone   408 

Wood    Frame    Electric    Incu- 
bators     320,   321 

Wood   Frame  Sieves    442 

Wood   Frame   Thermometer.  .    499 
Wood    Levels,   Mechanics'....    3 

Wood  Mallet   336 

Wood   Supports    477-480 

Wood   Working   Tools.  ..  .145. 
303.    305.    406,    434,    503,    504,    523 

Woodworth  Slide  Rule 444 

Wool,  Glass 297 

Work   Bench    523 

Woulff  Bottles   107 

Wrapping  Paper   3 

Wrenches,  All  Kinds 523 

"Wrench,    Screw    Tap 43S 

Wright  Blood   Capsules 

Wright   Blood  Pipettes 87 

Writing  Diamond    185 

Wrought   Iron   Crucibles 171 

Wurtz    Distilling    Tube 200 


T  Bridge  Clamps 151 

Y  Tubes   506 

Tarn   Testing  Machines 48* 

Young's   Distilling   Tubes 200 


Zahradink's   Potash    Bulb 414 

Zappert  -  Ewlng  Haemacyto- 

meter    

Zincs    for   Batteries 66-69 

Zinc  Condenser    1 

Zinc  Sheet 526 

Zinc    Tube,    Vanier 161,  204 

Zinc  Wire    523 


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